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Dynamic mechanical and shape memory properties of copolymers based on polyetheramine‐type benzoxazines and diglycidylether of bisphenol‐A
Author(s) -
Li Cuiyun,
Shen Shanshan,
Li Zhiyun,
Zhen Hecheng,
Huang Jinbai,
Liu Yanfang
Publication year - 2018
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.46838
Subject(s) - copolymer , materials science , epoxy , diglycidyl ether , bisphenol a , glass transition , dynamic mechanical analysis , polymer chemistry , polymer , composite material , substituent , chemistry , organic chemistry
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.