Synthesis and characterization of novel semiaromatic copolyamides bearing both polar hydroxyl and unsaturated allyl substituents

Wenbin Wang, Xiang Qi, Fei Zhang, Yingdan Zhu, Xinhua Wan

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

A series of novel semiaromatic (co)polyamides, poly(octylene terephthalamide)-ran-poly[octylene 2,5-bis(allyloxy)terephthalamide] (APA8T-x, x represents the molar fraction of allyloxy containing structure unit), were prepared via the interfacial polymerization of 1,8-diaminooctane, terephthaloyl chloride, and 2,5-bis(allyloxy)terephthaloyl chloride. The polymerization conditions were optimized in terms of the yields and the molecular weights of the resultant polymers. These polymers were converted to the target macromolecules, poly(octylene terephthalamide)-ran-poly[octylene (2,5-dihydroxy-3,6-diallyl)terephthalamide] (CRPA8T-x), through solid state Claisen rearrangement reaction, as characterized by 1H NMR and FT-IR spectroscopies. While APA8T-x was only soluble in very limited solvents, the solubility of CRPA8T-x in polar solvents improved remarkably, especially for those with high counit content. Due to the polarity of hydroxyl group, CRPA8T-x showed an improved hydrophilicity than APA8T-x. The treatment of aramid fibers with CRPA8T-x, as sizing agents, enhanced obviously their interfacial adhesion toward epoxy resin. The fibers sized with 0.5 wt% CRPA8T-75 solution in the mixture of 1,1,2,2-tetrachloroethane and phenol (40:60, w/w) exhibited a maximum increase of 60% in interfacial shear strength than the naked fibers. The easy preparation and the facility for the further modification through the dual functional substituents may greatly widen the application of semiaromatic polyamides.

Original languageEnglish (US)
Pages (from-to)690-698
Number of pages9
JournalJournal of Polymer Science, Part A: Polymer Chemistry
Volume55
Issue number4
DOIs
Publication statusPublished - Feb 15 2017
Externally publishedYes

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All Science Journal Classification (ASJC) codes

  • Polymers and Plastics
  • Organic Chemistry
  • Materials Chemistry

Keywords

  • Claisen rearrangement reaction
  • hydrophilicity
  • interfacial polymerization
  • poly(octylene terephthalamide)
  • poly[octylene(2,5-dihydroxy-3,6-diallyl)terephthalamide]
  • semiaromatic polyamide
  • solubility

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