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Polymerization

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which absorbs the light and then transfers energy to the monomer. In general, only the initiation step differs from that of the ordinary thermal polymerization of the same monomer; subsequent propagation, termination, and chain-transfer steps are unchanged. In step-growth photopolymerization,
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Step-growth and chain-growth are the main classes of polymerization reaction mechanisms. The former is often easier to implement but requires precise control of stoichiometry. The latter more reliably affords high molecular-weight polymers, but only applies to certain monomers.
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Photopolymerization can be used as a photographic or printing process because polymerization only occurs in regions which have been exposed to light. Unreacted monomer can be removed from unexposed regions, leaving a relief polymeric image. Several forms of
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reactions are chain-growth polymerizations which are initiated by the absorption of visible or ultraviolet light. Photopolymerization can also be a step-growth polymerization. The light may be absorbed either directly by the reactant monomer
666:(PVC), which are produced in high tonnages each year due to their usefulness in manufacturing processes of commercial products, such as piping, insulation and packaging. In general, polymers such as PVC are referred to as " 1264:
absorption of light triggers an addition (or condensation) reaction between two comonomers that do not react without light. A propagation cycle is not initiated because each growth step requires the assistance of light.
1125:. Once the growth of a chain is initiated by formation of an active center, chain propagation is usually rapid by addition of a sequence of monomers. Long chains are formed from the beginning of the reaction. 1730:
Soto, Marc; SebastiĂĄn, Rosa MarĂ­a; Marquet, Jordi (2014). "Photochemical Activation of Extremely Weak Nucleophiles: Highly Fluorinated Urethanes and Polyurethanes from Polyfluoro Alcohols".
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intermediates, which are in general short-lived and relatively unstable "mid-stage" compounds that react with other non-polar molecules present to form more stable polymeric compounds.
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Step-growth polymers increase in molecular weight at a very slow rate at lower conversions and reach moderately high molecular weights only at very high conversion (i.e., >95%).
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Diverse methods are employed to manipulate the initiation, propagation, and termination rates during chain polymerization. A related issue is temperature control, also called
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Wang, Xifan; Schmidt, Franziska; Hanaor, Dorian; Kamm, Paul H.; Li, Shuang; Gurlo, Aleksander (May 2019). "Additive manufacturing of ceramics from preceramic polymers".
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In chain-growth (or chain) polymerization, the only chain-extension reaction step is the addition of a monomer to a growing chain with an active center such as a
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Chain-growth polymerization (or addition polymerization) involves the linking together of unsaturated monomers, especially containing carbon-carbon
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and molecular weight may be improved, these methods may introduce additional processing requirements to isolate the product from a solvent.
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In step-growth (or step) polymerization, pairs of reactants, of any lengths, combine at each step to form a longer polymer molecule. The
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Polymerization that is not sufficiently moderated and proceeds at a fast rate can be very hazardous. This phenomenon is known as
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Step-growth polymers are formed by independent reaction steps between functional groups of monomer units, usually containing
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chains or three-dimensional networks. There are many forms of polymerization and different systems exist to categorize them.
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Multiphoton polymerization using single pulses have also been demonstrated for fabrication of complex structures using a
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hydrates or simple aldehydes, are able to polymerize themselves at quite low temperatures (ca. −80 Â°C) to form
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and alcohol bifunctional monomers) without loss of water or other volatile molecules, and are classified as
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As alkenes can polymerize in somewhat straightforward radical reactions, they form useful compounds such as
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monomer's double bond reforms as a single bond plus a bond to another styrene monomer. The product is
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McKenzie, Thomas G.; Fu, Qiang; Wong, Edgar H. H.; Dunstan, Dave E.; Qiao, Greg G. (23 June 2015).
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The manner in which polymerization is conducted is a highly evolved technology. Methods include
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Mills, Benjamin; Grant-Jacob, James A; Feinaeugle, Matthias; Eason, Robert W (17 June 2013).
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to afford polyamides (e.g., nylons) is an example of step-growth polymerization.
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such as nitrogen or oxygen. Most step-growth polymers are also classified as
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require more complex synthesis due to the way in which reactants polymerize.
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Introduction to Polymer Science and Chemistry:A Problem-Solving Approach
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links with loss of water. However, there are exceptions; for example
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to form ring cyclic structures, or undergo further reactions to form
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Allcock, H. R.; Lampe, Frederick Walter; Mark, James E. (2003).
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Reversible addition−fragmentation chain-transfer polymerization
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increases slowly. Long chains form only late in the reaction.
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Polymers : chemistry and physics of modern materials
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Clayden, Jonathan; Greeves, Nick; Warren, Stuart (2001).
1183:. A special case of chain-growth polymerization leads to 1448:. Oxford: Oxford University Press. pp. 1450–1466. 1152:
are converted to high molecular weight alkanes (-RCHCH
1764: 1648: 991:; molecules consisting of 3 monomer units, which can 911: 839: 767: 690: 631:; in contrast, reactions involving substitution at a 1443: 1175:Other forms of chain growth polymerization include 968: 896: 824: 744: 1439: 1437: 1435: 1433: 1431: 1429: 1427: 1425: 1868: 1541: 1034:A classification of the polymerization reactions 1617:Ullmann's Encyclopedia of Industrial Chemistry 1422: 969:{\displaystyle A+B+A+B...\rightarrow BBAB...} 897:{\displaystyle A+B+A+B...\rightarrow AABB...} 825:{\displaystyle A+B+A+B...\rightarrow ABAB...} 547: 1481:(2nd ed.). CRC Press (published 2013). 1373:The IUPAC Compendium of Chemical Terminology 1278:two-photon absorption 3D photopolymerization 745:{\displaystyle A+A+A+...\rightarrow AAAA...} 619:present in the reactants and their inherent 1609: 1607: 1022:Step-growth vs. chain-growth polymerization 623:. In more straightforward polymerizations, 554: 540: 1838: 1778: 1723: 1380: 149:Nitroxide-mediated radical polymerization 1604: 1197: 1029: 637: 627:form polymers through relatively simple 602: 27:Chemical reaction to form polymer chains 1614:Jeremic, Dusan (2014). "Polyethylene". 1613: 14: 1869: 1620:. Weinheim: Wiley-VCH. pp. 1–42. 1239: 1018:, and can cause fires and explosions. 1717:10.1016/j.reactfunctpolym.2022.105464 1577: 1501: 1476: 1395: 1084:are step-growth polymers formed from 1698: 1573: 1571: 1537: 1535: 1533: 1531: 1148:. In these cases, the alkenes RCH=CH 1259:photopolymerization), or else by a 1092:rather than condensation polymers. 607:IUPAC definition for polymerization 24: 38: 25: 1888: 1568: 1528: 134:Controlled radical polymerization 1705:Reactive and Functional Polymers 1177:cationic addition polymerization 1803: 1758: 1692: 1191:allows considerable control of 1181:anionic addition polymerization 1102: 1642: 1580:Polymer science and technology 1544:Contemporary polymer chemistry 1495: 1470: 1389: 1364: 1038: 942: 870: 798: 718: 676: 13: 1: 1626:10.1002/14356007.a21_487.pub3 1357: 983:Other monomer units, such as 97:Flory–Huggins solution theory 1699:Kaya, Kerem (January 2023). 1678:10.1021/acs.macromol.5b00965 1400:. London: Chapman and Hall. 1346:Sequence-controlled polymers 1230:precipitation polymerization 1189:Ziegler–Natta polymerization 588:), is a process of reacting 7: 1789:10.1016/j.addma.2019.02.012 1341:Ring-opening polymerization 1290: 1109:Chain-growth polymerization 1068:chains grow by reaction of 163:Condensation polymerization 129:Free-radical polymerization 124:Chain-growth polymerization 10: 1893: 1285:digital micromirror device 1280:—use photopolymerization. 1272:—including layer-by-layer 1243: 1106: 1097:Solid state polymerization 1045:Step-growth polymerization 1042: 158:Step-growth polymerization 1396:Young, Robert J. (1981). 1226:suspension polymerization 1877:Polymerization reactions 1502:Cowie, J. M. G. (2008). 1398:Introduction to polymers 1326:Polymer characterization 1303:Enzymatic polymerization 1578:Fried, Joel R. (2003). 1382:10.1351/goldbook.P04740 1232:. Although the polymer 1222:solution polymerization 1218:emulsion polymerization 168:Addition polymerization 102:Coil–globule transition 1767:Additive Manufacturing 1477:Manas, Chanda (2023). 1206: 1035: 970: 898: 826: 746: 655: 608: 280:Self-healing hydrogels 43: 1321:Plasma polymerization 1201: 1185:living polymerization 1062:condensation polymers 1033: 971: 899: 827: 747: 644:alkene polymerization 641: 606: 494:Cookware and bakeware 446:Industrial production 314:X-ray crystallography 42: 1840:10.1364/oe.21.014853 909: 837: 765: 688: 1831:2013OExpr..2114853M 1670:2015MaMol..48.3864M 1252:photopolymerization 1240:Photopolymerization 467:Protective Coatings 82:Mark–Houwink theory 18:Photopolymerization 1371:"Polymerization". 1207: 1202:Polymerization of 1142:polyvinyl chloride 1051:average molar mass 1036: 966: 894: 822: 742: 674:(or co-polymers). 664:polyvinyl chloride 656: 613:chemical compounds 609: 44: 1744:10.1021/jo5005789 1738:(11): 5019–5027. 1664:(12): 3864–3872. 1513:978-0-8493-9813-1 1488:978-1-4665-5385-9 1446:Organic chemistry 1274:stereolithography 1193:polymer branching 1090:addition polymers 981: 980: 629:radical reactions 617:functional groups 594:chemical reaction 590:monomer molecules 570:polymer chemistry 564: 563: 477:Consumer products 16:(Redirected from 1884: 1861: 1860: 1842: 1816: 1807: 1801: 1800: 1782: 1762: 1756: 1755: 1727: 1721: 1720: 1696: 1690: 1689: 1655: 1646: 1640: 1639: 1611: 1602: 1601: 1575: 1566: 1565: 1539: 1526: 1525: 1499: 1493: 1492: 1474: 1468: 1467: 1441: 1420: 1419: 1393: 1387: 1386: 1384: 1368: 1016:autoacceleration 975: 973: 972: 967: 903: 901: 900: 895: 831: 829: 828: 823: 751: 749: 748: 743: 677: 646:, in which each 578:American English 556: 549: 542: 460:Applied coatings 297:Characterization 30: 29: 21: 1892: 1891: 1887: 1886: 1885: 1883: 1882: 1881: 1867: 1866: 1865: 1864: 1825:(12): 14853–8. 1814: 1808: 1804: 1763: 1759: 1728: 1724: 1697: 1693: 1653: 1647: 1643: 1636: 1612: 1605: 1590: 1576: 1569: 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252: 251: 250: 245: 240: 235: 228:Vinyl polymers 225: 220: 215: 210: 209: 208: 203: 198: 188: 184: 181:Classification 179: 178: 175: 174: 171: 170: 165: 160: 154: 153: 152: 151: 146: 141: 131: 126: 120: 115: 114: 111: 110: 107: 106: 105: 104: 99: 94: 89: 84: 77:Phase behavior 74: 69: 64: 59: 53: 50: 49: 46: 45: 35: 34: 26: 9: 6: 4: 3: 2: 1889: 1878: 1875: 1874: 1872: 1858: 1854: 1850: 1846: 1841: 1836: 1832: 1828: 1824: 1820: 1813: 1806: 1798: 1794: 1790: 1786: 1781: 1776: 1772: 1768: 1761: 1753: 1749: 1745: 1741: 1737: 1733: 1726: 1718: 1714: 1710: 1706: 1702: 1695: 1687: 1683: 1679: 1675: 1671: 1667: 1663: 1659: 1652: 1645: 1637: 1635:9783527306732 1631: 1627: 1623: 1619: 1618: 1610: 1608: 1599: 1595: 1591: 1589:0-13-018168-4 1585: 1581: 1574: 1572: 1563: 1559: 1555: 1553:0-13-065056-0 1549: 1545: 1538: 1536: 1534: 1532: 1523: 1519: 1515: 1509: 1505: 1498: 1490: 1484: 1480: 1473: 1465: 1461: 1457: 1455:0-19-850347-4 1451: 1447: 1440: 1438: 1436: 1434: 1432: 1430: 1428: 1426: 1417: 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Org. Chem 1731: 1725: 1708: 1704: 1694: 1661: 1657: 1644: 1615: 1579: 1543: 1503: 1497: 1478: 1472: 1445: 1397: 1391: 1372: 1366: 1308: 1282: 1266: 1260: 1256: 1251: 1249: 1246:Photopolymer 1215: 1208: 1174: 1134:polyethylene 1130:double bonds 1127: 1115:free radical 1112: 1103:Chain-growth 1096: 1094: 1055: 1048: 1025: 1013: 1007:addition of 1005:nucleophilic 985:formaldehyde 982: 754: 681:Homopolymers 668:homopolymers 667: 660:polyethylene 657: 643: 610: 581: 573: 567: 565: 511:Vinyl record 455:Blow molding 441:Applications 213:Polyurethane 196:Polyethylene 116: 57:Architecture 1316:Metallocene 1270:3D printing 1144:(PVC), and 1058:heteroatoms 1039:Step-growth 652:polystyrene 526:Plastic bag 472:3D printing 260:Homopolymer 248:Polystyrene 72:Degradation 1780:1905.02060 1711:: 105464. 1358:References 1298:Cross-link 1234:dispersity 1160:(R = H, CH 1086:isocyanate 1009:hemiacetal 758:Copolymers 672:copolymers 487:Whitewalls 409:Staudinger 379:MacDiarmid 363:Scientists 349:Viscometry 191:Polyolefin 67:Morphology 51:Properties 1849:1094-4087 1797:104470679 1773:: 80–90. 1686:0024-9297 1066:polyester 1001:oligomers 997:tetramers 943:→ 871:→ 799:→ 719:→ 596:to form 450:Extrusion 429:Braconnot 419:Baekeland 399:de Gennes 384:Shirakawa 344:Rheometry 275:Hydrogels 265:Copolymer 256:Structure 218:Polyester 117:Synthesis 62:Tacticity 1871:Category 1857:23787672 1752:24820955 1598:51769096 1562:51096012 1522:82473191 1464:43338068 1375:. 2014. 1291:See also 1204:ethylene 1164:, Cl, CO 1146:acrylate 499:Bakelite 414:Goodyear 339:Rheology 1827:Bibcode 1666:Bibcode 1416:8086791 1351:Sol-gel 1309:In situ 1070:alcohol 993:cyclize 989:trimers 648:styrene 625:alkenes 598:polymer 424:Hayward 404:Ziegler 394:Edwards 1855:  1847:  1795:  1750:  1684:  1632:  1596:  1586:  1560:  1550:  1520:  1510:  1485:  1462:  1452:  1414:  1404:  1257:direct 1228:, and 1119:cation 580:), or 516:Kevlar 374:Heeger 1815:(PDF) 1793:S2CID 1775:arXiv 1654:(PDF) 1250:Most 1123:anion 1121:, or 1078:ester 482:Tires 389:Natta 369:Flory 1853:PMID 1845:ISSN 1748:PMID 1682:ISSN 1630:ISBN 1594:OCLC 1584:ISBN 1558:OCLC 1548:ISBN 1518:OCLC 1508:ISBN 1483:ISBN 1460:OCLC 1450:ISBN 1412:OCLC 1402:ISBN 1276:and 1179:and 1072:and 662:and 309:FTIR 270:Gels 243:PVAc 144:RAFT 139:ATRP 92:LCST 87:UCST 1835:doi 1785:doi 1740:doi 1713:doi 1709:182 1674:doi 1622:doi 1377:doi 1172:). 611:In 568:In 334:DMA 329:TGA 324:NMR 319:DSC 304:GPC 238:PVA 233:PVC 1873:: 1851:. 1843:. 1833:. 1823:21 1821:. 1817:. 1791:. 1783:. 1771:27 1769:. 1746:. 1736:79 1734:. 1707:. 1703:. 1680:. 1672:. 1662:48 1660:. 1656:. 1628:. 1606:^ 1592:. 1570:^ 1556:. 1530:^ 1516:. 1458:. 1424:^ 1410:. 1287:. 1224:, 1220:, 1195:. 1187:. 1168:CH 1156:-) 1140:, 1136:, 1117:, 572:, 1859:. 1837:: 1829:: 1799:. 1787:: 1777:: 1754:. 1742:: 1719:. 1715:: 1688:. 1676:: 1668:: 1638:. 1624:: 1600:. 1564:. 1524:. 1491:. 1466:. 1418:. 1385:. 1379:: 1255:( 1170:3 1166:2 1162:3 1158:n 1154:2 1150:2 964:. 961:. 958:. 955:B 952:A 949:B 946:B 940:. 937:. 934:. 931:B 928:+ 925:A 922:+ 919:B 916:+ 913:A 892:. 889:. 886:. 883:B 880:B 877:A 874:A 868:. 865:. 862:. 859:B 856:+ 853:A 850:+ 847:B 844:+ 841:A 820:. 817:. 814:. 811:B 808:A 805:B 802:A 796:. 793:. 790:. 787:B 784:+ 781:A 778:+ 775:B 772:+ 769:A 740:. 737:. 734:. 731:A 728:A 725:A 722:A 716:. 713:. 710:. 707:+ 704:A 701:+ 698:A 695:+ 692:A 654:. 584:( 576:( 555:e 548:t 541:v 20:)

Index

Photopolymerization
Polyacetylene
Architecture
Tacticity
Morphology
Degradation
Phase behavior
Mark–Houwink theory
UCST
LCST
Flory–Huggins solution theory
Coil–globule transition
Synthesis
Chain-growth polymerization
Free-radical polymerization
Controlled radical polymerization
ATRP
RAFT
Nitroxide-mediated radical polymerization
Step-growth polymerization
Condensation polymerization
Addition polymerization
Classification
Polyolefin
Polyethylene
Polypropylene
Polyisobutylene
Polyurethane
Polyester
Polycarbonate

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