Knowledge

Thermosetting polymer

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adjusted from the molecular weight and functionality of isocyanate resins, prepolymers, and the exact combinations of diols, triols and polyols selected, with the rate of reaction being strongly influenced by catalysts and inhibitors; polyureas form virtually instantaneously when isocyanate resins are combined with long-chain amine functional polyether or polyester resins and short-chain diamine extenders – the amine-isocyanate nucleophilic addition reaction does not require catalysts. Polyureas also form when isocyanate resins come into contact with moisture;
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formed and highly branched crosslinked structures develop, the rate of cure being influenced by the physical form and functionality of epoxy resins and curing agents – elevated temperature postcuring induces secondary crosslinking of backbone hydroxyl functionality which condense to form ether bonds;
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composites, which are used in the fabrication of factory-finished structural composite OEM or replacement parts, and as site-applied, cured and finished composite repair and protection materials. When used as the binder for aggregates and other solid fillers, they form particulate-reinforced polymer
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and re-shaped after they are cured. This usually prevents recycling for the same purpose, except as filler material. New developments involving thermoset epoxy resins which on controlled and contained heating form crosslinked networks permit repeatedly reshaping, like silica glass by reversible
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Epoxy functional resins can be homo-polymerized with anionic or cationic catalysts and heat, or copolymerised through nucleophilic addition reactions with multifunctional crosslinking agents which are also known as curing agents or hardeners. As reaction proceeds, larger and larger molecules are
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Polyurethanes form when isocyanate resins and prepolymers are combined with low- or high-molecular weight polyols, with strict stoichiometric ratios being essential to control nucleophilic addition polymerisation – the degree of crosslinking and resulting physical type (elastomer or plastic) is
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applications up to the decomposition temperature since they keep their shape as strong covalent bonds between polymer chains cannot be broken easily. The higher the crosslink density and aromatic content of a thermoset polymer, the higher the resistance to heat degradation and chemical attack.
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resins all cured by polycondensation involving the release of water and heat, with cure initiation and polymerisation exotherm control influenced by curing temperature, catalyst selection or loading and processing method or pressure – the degree of pre-polymerisation and level of residual
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Thermosetting polymer mixtures based on thermosetting resin monomers and pre-polymers can be formulated and applied and processed in a variety of ways to create distinctive cured properties that cannot be achieved with thermoplastic polymers or inorganic materials.
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diluents, with cure initiated by free radicals generated from ionizing radiation or by the photolytic or thermal decomposition of a radical initiator – the intensity of crosslinking is influenced by the degree of backbone unsaturation in the prepolymer;
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covalent bond exchange reactions on reheating above the glass transition temperature. There are also thermoset polyurethanes shown to have transient properties and which can thus be reprocessed or recycled.
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Hard, plastic thermosets may undergo permanent or plastic deformation under load. Elastomers, which are soft and springy or rubbery and can be deformed and revert to their original shape on loading release.
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or polycyanurates for electronics applications with need for dielectric properties and high glass temperature requirements in aerospace structural composite components.
366:, used alone or hybridised with epoxy and phenolic resins, for structural prepregs, liquid molding and film adhesives for composite construction, bonding and repair. 764:; Marc A. Hillmyer; William R. Dichtel (2015). "Mechanically Activated, Catalyst-Free Polyhydroxyurethane Vitrimers". Journal of the American Chemical Society. 822:
Guzman, Enrique; Cugnoni, Joël; Gmür, Thomas (2014). "Multi-Factorial Models of a Carbon Fibre/Epoxy Composite Subjected to Accelerated Environmental Ageing".
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Reactive Polymers Fundamentals and Applications: A Concise Guide to Industrial Polymers (Plastics Design Library), William Andrew Inc., 2nd edition, 2013,
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fiberglass systems: sheet molding compounds and bulk molding compounds; filament winding; wet lay-up lamination; repair compounds and protective coatings.
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used in printed circuit boards and in body parts of modern aircraft, aerospace composite structures, as a coating material and for glass reinforced pipes.
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Mechanical strength and hardness also improve with crosslink density, although at the expense of brittleness. They normally decompose before melting.
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Roberto C. Dante, Diego A. SantamarĂ­a and JesĂşs MartĂ­n Gil (2009). "Crosslinking and thermal stability of thermosets based on novolak and melamine".
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are cured by an exothermal ring-opening polymerisation without releasing any chemical, which translates in near zero shrinkage upon polymerisation.
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polymers which are commonly produced and distributed in the form of pellets, and shaped into the final product form by melting, pressing, or
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Kulkarni, Romit; Wappler, Peter; Soltani, Mahdi; Haybat, Mehmet; Guenther, Thomas; Groezinger, Tobias; Zimmermann, André (1 February 2019).
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composites, which are used for factory-applied protective coating or component manufacture, and for site-applied and cured construction, or
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resins used in the manufacture of sustainable biocomposite construction, cements, adhesives, coatings and casting/foundry resins.
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Diallyl-phthalate (DAP) used in high temperature and mil-spec electrical connectors and other components. Usually glass filled.
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ISO 24817 Composite Repairs for Pipework: Qualification and Design, Installation, Testing and Inspection, 2015, ICS: 75.180.20
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Industrial Polymer Applications: Essential Chemistry and Technology, Royal Society of Chemistry, UK, 1st edition, 2016,
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Epoxy novolac resins used for printed circuit boards, electrical encapsulation, adhesives and coatings for metal.
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resins used for wet lay-up laminating, molding and fast setting industrial protection and repair materials.
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materials due to the three-dimensional network of bonds (crosslinking), and are also better suited to high-
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Concise Encyclopedia of Polymer Science and Engineering, ed. J.I. Kroschwitz, Wiley, New York, 1990,
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with unsaturated sites at the ends or on the backbone are generally linked by copolymerisation with
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PCC-2 Repair of Pressure Equipment and Piping, American Society of Mechanical Engineers, 2015,
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or chain extension through the formation of covalent bonds between individual chains of the
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Polymer Matrix Composites: Materials Usage, Design, and Analysis, SAE International, 2012,
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used for thermoset polymer matrix composites and as ceramic matrix composite precursors.
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Mold or mold runners (the black plastic part in integrated circuits or semiconductors).
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T Malaba, J Wang, Journal of Composites, vol. 2015, Article ID 707151, 8 pages, 2015.
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Chemistry and Technology of Epoxy Resins, ed. B. Ellis, Springer Netherlands, 1993,
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Unsaturated Polyester Technology, ed. P.F. Bruins, Gordon and Breach, New York, 1976
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D. Montarnal, M. Capelot, F. Tournilhac, L. Leibler, Science, 2011, 334, 965-968],
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Polyurethane Handbook, ed. G Oertel, Hanser, Munich, Germany, 2nd edition, 1994,
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hydroxymethyl content in the resins determine the crosslink density.
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Design and Manufacture with Polymers: Introduction to Polymers
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Application/process uses and methods for thermosets include
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hybrids used for abrasion resistant waterproofing coatings.
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Polymer obtained by irreversibly hardening (curing) a resin
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Ishiwata, Hajimu; Inoue, Takiko; Tanimura, Akio (1986).
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Conventional thermoset plastics or elastomers cannot be
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When compounded with fibers, thermosetting resins form
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or liquid prior to curing, and is often designed to be
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and may be promoted by high pressure or mixing with a
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resin used in electrical insulators and plasticware.
212:Thermosetting plastics are generally stronger than 855:Journal of Manufacturing and Materials Processing 821: 354:used on worktop surfaces and some plastic dishes. 1858: 338:automobile, currently used for household objects 116:into the final shape. It may also be used as an 348:, particleboard and medium-density fibreboard. 1483: 976: 481:(used for objects such as milk bottle crates) 236: 735:, page 9. Milton Keynes: The Open University 473:Specific methods of molding thermosets are: 707:S.H. Goodman, H. Dodiuk-Kenig, ed. (2013). 139:a thermosetting resin transforms it into a 1490: 1476: 983: 969: 866: 71:). Curing is induced by heat or suitable 18: 1859: 1073:Polyethylene terephthalate (PET, PETE) 1471: 1013:Cross-linked polyethylene (PEX, XLPE) 1008:Acrylonitrile butadiene styrene (ABS) 964: 760:Fortman, David J.; Jacob P. Brutman; 731:The Open University (UK), 2000. T838 711:(3rd ed.). USA: William Andrew. 266:such as glass-reinforced plastic and 262:used as the matrix component in many 93:between polymer chains to produce an 1825:List of environmental health hazards 1745:List of environmental health hazards 35:to give a rigid 3D thermoset polymer 131: 13: 1630:Miscellaneous additives incl. PHCs 884:Journal of Applied Polymer Science 568:Compendium of Chemical Terminology 63:") a soft solid or viscous liquid 26:: individual linear polymer chains 14: 1883: 104:The starting material for making 31:: Polymer chains which have been 1162: 1156: 1048:Polybutylene terephthalate (PBT) 1023:Poly(methyl methacrylate) (PMMA) 836:10.1016/j.compstruct.2013.12.028 1028:Poly(ethyl methacrylate) (PEMA) 941: 915:Food Additives and Contaminants 902: 875: 842: 815: 806: 790: 774: 754: 738: 725: 397: 162:Acrylic resins, polyesters and 1391:Category:Plastics applications 1138:Styrene maleic anhydride (SMA) 1133:Polyvinylidene chloride (PVDC) 1118:Polytetrafluoroethylene (PTFE) 709:Handbook of Thermoset Plastics 700: 684: 668: 650: 634: 610: 594: 585: 556: 1: 1098:Poly(p-phenylene oxide) (PPO) 549: 207: 1815:Persistent organic pollutant 1776:Toxic Substances Control Act 1735:Persistent organic pollutant 1018:Ethylene vinyl acetate (EVA) 990: 418:for jointing and injection, 253: 7: 1808:Great Pacific garbage patch 1730:Great Pacific garbage patch 1143:Styrene-acrylonitrile (SAN) 1058:Polyetheretherketone (PEEK) 662:Polymer Properties Database 534:Fusion bonded epoxy coating 527: 268:graphite-reinforced plastic 10: 1888: 1771:Japan Toxic Substances Law 1566:Miscellaneous plasticizers 237:Fiber-reinforced materials 1845: 1790: 1766:European REACH regulation 1761:California Proposition 65 1753: 1710: 1667: 1629: 1596: 1565: 1511: 1504:polyhalogenated compounds 1460: 1405: 1381:High-performance plastics 1350: 1343: 1255: 1214: 1206:High-performance plastics 1171: 1154: 998: 927:10.1080/02652038609373566 264:fiber reinforced plastics 1191:Fibre-reinforced plastic 1128:Polyvinyl chloride (PVC) 581:10.1351/goldbook.TT07168 539:Thermoset polymer matrix 243:fiber-reinforced polymer 1242:Biodegradable additives 750:10.1126/science.1212648 501:thermosetting plastics) 1872:Thermosetting plastics 1657:Perfluorooctanoic acid 1093:Polyphenyl ether (PPE) 1088:Polyoxymethylene (POM) 1033:Polyacrylic acid (PAA) 36: 1837:Biodegradable plastic 1186:Thermosetting polymer 1083:Polylactic acid (PLA) 762:Christopher J. Cramer 573:thermosetting polymer 440:electrical insulation 45:thermosetting polymer 22: 1848:Identification codes 1448:Foam food containers 1371:Engineering plastics 824:Composite Structures 770:10.1021/jacs.5b08084 507:(used for producing 55:that is obtained by 1687:Endocrine disruptor 1285:Compression molding 1237:Polymer stabilizers 953:10.1155/2015/707151 868:10.3390/jmmp3010018 491:Compression molding 168:unsaturated monomer 1702:Polymer fume fever 1361:Commodity plastics 1335:Rotational molding 1305:Fiberglass molding 1265:Injection moulding 1247:Filler (materials) 1196:Corrugated plastic 1148:Tritan copolyester 1103:Polypropylene (PP) 1053:Polycarbonate (PC) 658:"Polybenzoxazines" 479:injection moulding 404:protective coating 37: 1867:Polymer chemistry 1854: 1853: 1832:Plastic recycling 1798:Plastic pollution 1784: 1783: 1718:Plastic pollution 1498:Health issues of 1456: 1455: 1352:Plastics industry 1270:Plastic extrusion 1123:Polyurethane (PU) 1113:Polysulfone (PES) 1068:Polyethylene (PE) 1043:Polybutylene (PB) 896:10.1002/app.31114 802:978-0-7918-6959-8 786:978-0-7680-7813-8 718:978-1-4557-3107-7 606:978-94-010-5302-0 517:gaming miniatures 485:Extrusion molding 422:, foundry sands, 412:civil engineering 408:seamless flooring 342:Urea-formaldehyde 312:Vulcanized rubber 126:injection molding 101:polymer network. 47:, often called a 41:materials science 1879: 1723:Rubber pollution 1573:Organophosphates 1492: 1485: 1478: 1469: 1468: 1348: 1347: 1320:Filament winding 1295:Transfer molding 1222:Polymer additive 1166: 1160: 1108:Polystyrene (PS) 985: 978: 971: 962: 961: 955: 945: 939: 938: 906: 900: 899: 890:(6): 4059–4065. 879: 873: 872: 870: 846: 840: 839: 819: 813: 810: 804: 794: 788: 778: 772: 758: 752: 742: 736: 729: 723: 722: 704: 698: 688: 682: 672: 666: 665: 654: 648: 638: 632: 614: 608: 598: 592: 589: 583: 560: 464:filament winding 198:Polybenzoxazines 132:Chemical process 1887: 1886: 1882: 1881: 1880: 1878: 1877: 1876: 1857: 1856: 1855: 1850: 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1616:Vinyl chloride 1613: 1610:Polycarbonates 1602: 1600: 1594: 1593: 1591: 1590: 1584: 1575: 1569: 1567: 1563: 1562: 1560: 1559: 1554: 1549: 1543: 1538: 1532: 1527: 1521: 1519: 1509: 1508: 1495: 1494: 1487: 1480: 1472: 1466: 1464: 1458: 1457: 1454: 1453: 1451: 1450: 1445: 1440: 1435: 1430: 1425: 1423:Packaging film 1420: 1415: 1409: 1407: 1406:Specific goods 1403: 1402: 1400: 1399: 1393: 1388: 1383: 1378: 1373: 1368: 1363: 1357: 1355: 1345: 1341: 1340: 1338: 1337: 1332: 1330:Vacuum forming 1327: 1322: 1317: 1312: 1307: 1302: 1297: 1292: 1287: 1282: 1277: 1272: 1267: 1261: 1259: 1253: 1252: 1250: 1249: 1244: 1239: 1234: 1229: 1224: 1218: 1216: 1212: 1211: 1209: 1208: 1203: 1201:Polymeric foam 1198: 1193: 1188: 1183: 1177: 1175: 1169: 1168: 1155: 1153: 1151: 1150: 1145: 1140: 1135: 1130: 1125: 1120: 1115: 1110: 1105: 1100: 1095: 1090: 1085: 1080: 1078:Polyimide (PI) 1075: 1070: 1065: 1060: 1055: 1050: 1045: 1040: 1038:Polyamide (PA) 1035: 1030: 1025: 1020: 1015: 1010: 1004: 1002: 996: 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1217: 1213: 1207: 1204: 1202: 1199: 1197: 1194: 1192: 1189: 1187: 1184: 1182: 1181:Thermoplastic 1179: 1178: 1176: 1170: 1165: 1159: 1149: 1146: 1144: 1141: 1139: 1136: 1134: 1131: 1129: 1126: 1124: 1121: 1119: 1116: 1114: 1111: 1109: 1106: 1104: 1101: 1099: 1096: 1094: 1091: 1089: 1086: 1084: 1081: 1079: 1076: 1074: 1071: 1069: 1066: 1064: 1061: 1059: 1056: 1054: 1051: 1049: 1046: 1044: 1041: 1039: 1036: 1034: 1031: 1029: 1026: 1024: 1021: 1019: 1016: 1014: 1011: 1009: 1006: 1005: 1003: 997: 993: 986: 981: 979: 974: 972: 967: 966: 963: 954: 950: 944: 936: 932: 928: 924: 920: 916: 912: 905: 897: 893: 889: 885: 878: 869: 864: 860: 856: 852: 845: 837: 833: 829: 825: 818: 809: 803: 799: 793: 787: 783: 777: 771: 767: 763: 757: 751: 747: 741: 734: 728: 720: 714: 710: 703: 697: 693: 687: 681: 677: 671: 663: 659: 653: 647: 643: 637: 631: 627: 623: 619: 613: 607: 603: 597: 588: 582: 578: 574: 570: 569: 564: 559: 555: 545: 544:Vulcanization 542: 540: 537: 535: 532: 531: 522: 518: 514: 510: 509:fishing lures 506: 503: 500: 496: 492: 489: 486: 483: 480: 476: 475: 474: 471: 469: 465: 461: 457: 453: 449: 445: 444:encapsulation 441: 437: 433: 429: 425: 421: 417: 414:construction 413: 409: 405: 392: 389: 386: 383: 380: 377: 374: 371: 368: 365: 362: 359: 356: 353: 350: 347: 344:foam used in 343: 340: 337: 333: 330: 327: 323: 319: 316: 313: 310: 307: 303: 300: 297: 296:Polyurethanes 294: 291: 288: 285: 282: 279: 278:Bismaleimides 275: 272: 269: 265: 261: 258: 257: 251: 249: 244: 234: 231: 226: 222: 219: 215: 214:thermoplastic 205: 201: 199: 195: 192: 188: 184: 180: 176: 172: 169: 165: 160: 158: 154: 150: 146: 142: 138: 129: 127: 123: 122:thermoplastic 119: 115: 111: 107: 102: 100: 96: 92: 91:cross-linking 88: 87: 82: 78: 74: 70: 66: 62: 58: 54: 50: 46: 42: 34: 30: 25: 21: 1513:Plasticizers 1461:Environment 1413:Blister pack 1366:Construction 1275:Blow molding 1185: 943: 921:(1): 63–69. 918: 914: 904: 887: 883: 877: 858: 854: 844: 827: 823: 817: 808: 792: 776: 756: 740: 732: 727: 708: 702: 686: 670: 661: 652: 636: 612: 596: 587: 566: 558: 505:Spin casting 472: 454:laminating, 401: 398:Applications 364:Benzoxazines 326:formaldehyde 306:polyurethane 240: 227: 223: 211: 202: 196: 181: 177: 173: 164:vinyl esters 161: 153:crosslinking 135: 105: 103: 84: 80: 59:hardening (" 57:irreversibly 48: 44: 38: 33:cross linked 28: 23: 1754:Regulations 1606:Bisphenol A 1290:Calendering 1232:Plasticizer 1172:Mechanical 391:Vinyl ester 260:Epoxy resin 248:maintenance 218:temperature 108:is usually 1861:Categories 1682:Carcinogen 1647:Organotins 1517:Phthalates 1463:and health 1310:Pultrusion 1300:Laminating 1258:processing 622:1569901570 550:References 456:pultrusion 452:wet lay-up 274:Polyimides 250:purposes. 208:Properties 106:thermosets 65:prepolymer 1711:Pollution 1677:Teratogen 1608:(BPA, in 1256:Plastics 1227:Colorants 1215:Additives 999:Chemical 861:(1): 18. 521:figurines 477:Reactive 468:pre-pregs 424:adhesives 332:Duroplast 254:Materials 145:elastomer 110:malleable 99:insoluble 95:infusible 73:radiation 49:thermoset 1692:Diabetes 1598:Monomers 1578:Adipates 1500:plastics 1354:segments 1344:Products 992:Plastics 528:See also 460:gelcoats 446:, solid 432:castings 428:sealants 385:Thiolyte 318:Bakelite 302:Polyurea 183:Phenolic 118:adhesive 86:hardener 81:catalyst 77:catalyst 1820:Dioxins 1740:Dioxins 1697:Obesity 1438:Cutlery 1428:Bottles 935:3956795 436:potting 420:mortars 346:plywood 336:Trabant 157:polymer 141:plastic 53:polymer 51:, is a 1537:(BBzP) 1506:(PHCs) 1418:Chairs 1386:Nurdle 933:  800:  784:  715:  694:  678:  644:  628:  620:  604:  416:grouts 322:phenol 230:melted 189:, and 149:rubber 137:Curing 114:molded 61:curing 1791:Waste 1637:PBDEs 1548:(DOP) 1174:types 1001:types 563:IUPAC 448:foams 373:Furan 191:furan 187:amino 151:) by 143:, or 69:resin 29:Right 1652:PFCs 1642:PCBs 1618:(in 1582:DEHA 1557:DINP 1552:DIDP 1546:DEHP 1541:DIHP 1525:DIBP 1502:and 1433:Bags 931:PMID 798:ISBN 782:ISBN 713:ISBN 692:ISBN 676:ISBN 642:ISBN 626:ISBN 618:ISBN 602:ISBN 513:jigs 511:and 497:and 320:, a 276:and 97:and 43:, a 24:Left 1620:PVC 1587:DOA 1535:BBP 1530:DBP 949:doi 923:doi 892:doi 888:114 863:doi 832:doi 828:111 766:doi 746:doi 577:doi 575:". 499:BMC 495:SMC 39:In 1863:: 1515:: 929:. 917:. 913:. 886:. 857:. 853:. 826:. 660:. 624:, 565:, 519:, 515:, 466:, 462:, 458:, 450:, 442:, 438:, 434:, 430:, 426:, 410:, 406:, 185:, 128:. 83:, 1622:) 1612:) 1589:) 1580:( 1491:e 1484:t 1477:v 984:e 977:t 970:v 951:: 937:. 925:: 919:3 898:. 894:: 871:. 865:: 859:3 838:. 834:: 768:: 748:: 721:. 664:. 579:: 324:- 314:. 304:/ 147:( 67:(

Index


cross linked
materials science
polymer
irreversibly
curing
prepolymer
resin
radiation
catalyst
hardener
cross-linking
infusible
insoluble
malleable
molded
adhesive
thermoplastic
injection molding
Curing
plastic
elastomer
rubber
crosslinking
polymer
vinyl esters
unsaturated monomer
Phenolic
amino
furan

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