共聚物
环氧树脂
材料科学
固化(化学)
氢键
高分子化学
复合材料
高分子科学
化学工程
聚合物
有机化学
分子
化学
工程类
作者
Wei-Chen Su,Fang‐Chang Tsai,Chih‐Feng Huang,Lizong Dai,Shiao‐Wei Kuo
出处
期刊:Polymers
[MDPI AG]
日期:2019-01-24
卷期号:11 (2): 201-201
被引量:24
标识
DOI:10.3390/polym11020201
摘要
In this study, we enhanced the toughness of epoxy resin by blending it with the diblock copolymer poly(ethylene oxide⁻b⁻ε-caprolactone) (PEO-b-PCL) with a benzoxazine monomer (PA-OH) as the thermal curing agent. After thermal curing, Fourier transform infrared spectroscopy revealed that intermolecular hydrogen bonding existed between the OH units of the epoxy⁻benzoxazine copolymer and the C⁻O⁻C (C=O) units of the PEO (PCL) segment. Differential scanning calorimetry and dynamic mechanical analysis revealed that the glass transition temperature and storage modulus of the epoxy⁻benzoxazine matrix decreased significantly upon increasing the concentration of PEO-b-PCL. The Kwei equation predicted a positive value of q, consistent with intermolecular hydrogen bonding in this epoxy⁻benzoxazine/PEO-b-PCL blend system. Scanning electron microscopy revealed a wormlike structure with a high aspect ratio for PEO-b-PCL as the dispersed phase in the epoxy⁻benzoxazine matrix; this structure was responsible for the improved toughness.
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