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Title of Journal: Fibers Polym

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Abbravation: Fibers and Polymers

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The Korean Fiber Society

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DOI

10.1016/0304-3991(80)90046-7

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ISSN

1875-0052

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Synthesis and properties of Nylon 4/5 copolymers f

Authors: KyeongSuk Kang YuKyoung Hong Young Jun Kim Joon Ho Kim
Publish Date: 2014/07/29
Volume: 15, Issue: 7, Pages: 1343-1348
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Abstract

Nylon 4 which can be synthesized by anionic ringopening polymerization has good mechanical properties and a very high affinity for water owing to its high polarity On the other hand despite its high melting temperature the polymer has not been commercialized because of its low thermal stability In this study copolymerization of 2pyrrolidone C4 with 2piperidone C5 was performed to reduce the melting temperature of Nylon 4 homopolymer The copolymerization reaction was controlled by changing the comonomer content catalyst content temperature initiator content and reaction time The Nylon copolymers were characterized by 1Hnuclear magnetic resonance NMR spectroscopy differential scanning calorimetry and thermogravimetric analysis The hydrophilic properties of Nylon 4 and its copolymers were evaluated by surface free energy analysis and moisture regain measurement The intrinsic viscosity and polymerization yield of Nylon 4 increased with increasing catalyst concentration until 5 mole and decreased with further increases in catalyst loading The proton NMR spectrum revealed the composition of the Nylon 4/5 copolymer to be 625 C4 moiety at a 55 comonomer feed ratio The melting temperature of the Nylon 4/5 copolymers decreased considerably according to the composition The moisture regain of the Nylon 4/5 copolymer was higher than 64 even at 773 C4 in composition

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