Dynamic mechanical and shape memory properties of copolymers based on polyetheramine‐type benzoxazines and diglycidylether of bisphenol‐A. Issue 47 (9th September 2018)

• Record Type: Journal Article
• Authors: Li, Cuiyun; Shen, Shanshan; Li, Zhiyun; Zhen, Hecheng; Huang, Jinbai; Liu, Yanfang
• Is Part Of: Journal of applied polymer science. Volume 135:Issue 47(2018)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2018-09-09
• Subjects: benzoxazine -- copolymer -- dynamic mechanical properties -- epoxy resin -- shape memory effect; Polymers -- Periodicals; Polymerization -- Periodicals; 668.9
• DOI: 10.1002/app.46838
• Languages: English
• ISSNs: 0021-8995

Abstract

ABSTRACT: Two series of benzoxazine/epoxy copolymers are prepared from polyetheramine‐type benzoxazines and diglycidyl ether of bisphenol A (DGEBA) in various weight ratios. Each copolymer appears a single glass‐transition temperature ( T g ), and the T g shows a systematic increase with increasing DGEBA content for both copolymer systems, but copolymers with low DGEBA content show respectively lower T g s than the corresponding pristine polybenzoxazines. Compared to the corresponding pristine polybenzoxazines, the effect of DGEBA content on the variation in T g of the copolymers depends on the substituent structure of benzoxazines. The two series of copolymers exhibit one‐way dual shape memory effect based on T g, and the shape memory effect is affected by both the substituent structure of benzoxazines and the content of DGEBA. Under motion constraints in tensile deformation mode, copolymers with low DGEBA content exhibit high shape recovery ratios (91.0–96.1%) over the corresponding polybenzoxazines (84.5%), whereas copolymers with high DGEBA content show relatively low shape recovery ratios (75.0–84.7%). © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci.2018, 135, 46838. Abstract : Two series of benzoxazine/epoxy copolymers are prepared from polyetheramine‐type benzoxazines and epoxy in various weight ratios. The T g shows a systematic increase with increasing epoxy content for both copolymer systems, but copolymers with low DGEBA content show respectively lower T g s than the corresponding pristine polybenzoxazines. Under tensile deformation mode, copolymers with low epoxy content exhibit respectively high shape recovery ratios over the corresponding pristine polybenzoxazines.