Poly(phenylene oxide) modified cyanate resin for self‐healing |
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| Authors: | Li Yuan Sidi Huang Yinhui Hu Yuzheng Zhang Aijuan Gu Guozheng Liang Guoqiang Chen Yongming Gao Steven Nutt |
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| Affiliation: | 1. College of Textile and Clothing Engineering, Soochow University, , Suzhou, Jiangsu, 215123 China;2. Jiangsu Yingxiang Chemical Fiber Stock Co., Ltd, , Wujiang, 215228 China;3. Department of Chemical Engineering and Materials Science, University of Southern California, , Los Angeles, CA, 90089 USA;4. Jiangsu Key Laboratory of Advanced Functional Polymer Design and Application, Department of Polymer Science and Engineering, College of Chemistry, Chemical Engineering, and Materials Science, Soochow University, , Suzhou, Jiangsu, 215123 China |
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| Abstract: | Self‐healing cyanate ester resins (CE) were developed by adding low molecular weight poly(phenylene oxide) (PPO) resin, yielding a high performance CE/PPO system via a low‐temperature process. The addition of PPO improved the flexural strength and fracture toughness of the CE matrix without sacrificing thermal properties. CE/PPO formulations with 5, 10, and 15 wt.% PPO showed 43%, 65%, and 105% increase in fracture toughness due to a combination of crack deflection, crack pinning, and matrix cavitation around second‐phase particles. When PPO was introduced into the CE, dielectric properties were either unchanged or declined. During thermal treatment to heal damaged CE, liquid PPO flowed into cracks, and during subsequent cooling, solidified to bond the crack surfaces. The self‐healing efficiency for CE with 15 wt.% PPO after heating to 220°C for 1 h exhibited a recovery of 73% in toughness and 81% in microtensile strength. Copyright © 2014 John Wiley & Sons, Ltd. |
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| Keywords: | polymers cracking mechanical properties thermal properties self‐healing ability |
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