A novel synthetic strategy for preparing semi‐aromatic components modified polyamide 6 polymer. Issue 9 (16th February 2018)

• Record Type: Journal Article
• Authors: Peng, Shumin; Peng, Lu; Yi, Chunwang; Zhang, Wei; Wang, Xi
• Is Part Of: Journal of polymer science. Volume 56:Issue 9(2018)
• Page Start: 959
• Page End: 967
• Publication Date: 2018-02-16
• Subjects: high yield -- novel synthetic path -- polyamide 6 -- properties -- semi‐aromatic segment; 547
• DOI: 10.1002/pola.28983
• Languages: English
• ISSNs: 0887-624X

Abstract

ABSTRACT: In this work, a novel synthetic path for preparing semi‐armotic components modified polyamide 6 was developed by caprolactam as solvent of purified terephthalic acid and 1, 6‐hexanediamine. First, the ring opening reaction and poly‐addition of caprolactam were initiated by 1, 6‐hexanediamine to generate a prepolymer containing amino groups in both ends, then followed by the poly‐condensation reaction with purified terephthalic acid, a long chain copolymer was produced, which the reaction time was reduced by 4 h compared with conventional hydrolytic ring‐opening polymerization of pure caprolactam. By varying the ratio of terephthalic acid and 1, 6‐hexanediamine, a series of copolymers with different number average molecular weight and physical properties were prepared. Analytical results showed that the conversion percentage of caprolactam is significantly increased by the proposed method. Furthermore, this new copolymers exhibited excellent transparence and high decomposition temperature. Besides, the copolymers with average molecular weight ≥15, 000 present good mechanical properties, making it a potentially useful application in plastics, textile yarn, and membranes. © 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem.2018, 56, 959–967 Abstract : Purified terephthalic acid and hexamethylene diamine were dissolved in the main reactant caprolactam according to the stoichiometric ratio. Through ring‐opening, poly‐addition, and poly‐condensation reactions at high temperature, polyamide‐6 is modified with transparent semi‐aromatic components, endowing it with a higher decomposition temperature and good mechanical properties. Using this time‐reducing green synthetic path, the yield of caprolactam was also significantly increased compared with the conversional hydrolytic polymerization process.