High performance epoxy-based composites for cryogenic use: A approach based on synergetic strengthening effects of epoxy grafted polyurethane and MWCNTs-NH2

被引：35

作者：

Jia, Liying ^{[1
]}

Qi, Pengfei ^{[1
]}

Shi, Ke ^{[1
]}

Liu, Xin ^{[1
]}

Ma, Wenli ^{[1
]}

Lin, Song ^{[3
]}

Zhang, Fei ^{[1
]}

Jia, Xiaolong ^{[1
,2
]}

Cai, Qing ^{[1
]}

Yang, Xiaoping ^{[1
,2
]}

机构：

[1] Beijing Univ Chem Technol, State Key Lab Organ Inorgan Composites, Beijing 100029, Peoples R China

[2] Beijing Univ Chem Technol, Key Lab Carbon Fiber & Funct Polymer, Minist Educ, Beijing 100029, Peoples R China

[3] North China Inst Aerosp Engn, Langfang 065000, Hebei, Peoples R China

来源：

COMPOSITES SCIENCE AND TECHNOLOGY | 2019年 / 184卷

基金：

中国国家自然科学基金; 北京市自然科学基金;

关键词：

Polymer-matrix composites (PMCs); Carbon nanotubes; Mechanical properties; Synergism; MICRO-CRACK BEHAVIOR; CARBON-FIBER; MECHANICAL-PROPERTIES; FRACTURE-TOUGHNESS; SIMULTANEOUS REINFORCEMENT; THERMAL-EXPANSION; TENSILE; IMPROVEMENT; HYDROGEL; NETWORK;

D O I：

10.1016/j.compscitech.2019.107865

中图分类号：

TB33 [复合材料];

学科分类号：

摘要：

Synergetic strengthening effects of epoxy grafted polyurethane (EP-PU) and aminated MWCNTs (MWCNTs-NH2) on mechanical performance of EP-based composites at 77 K were systematically investigated using the tested results at room temperature (RT) as comparisons. EP-PU was successfully synthesized by controlling the reaction between -OH in EP and -NCO in PU prepolymer, which showed the advantages of relatively low viscosity and outstanding chemical miscibility with EP matrix. The most obvious enhancements were achieved with contents of 30 wt% EP-PU and 0.2 wt% MWCNTs-NH2 in tensile, flexural, impact and K(IC )fracture toughness properties of EP composites as well as flexural properties and interlaminar shear strength (ILSS) of carbon fiber (CF)/EP composites at both RT and 77 K, which confirmed the synergetic strengthening effects of EP-PU and MWCNTs-NH2. Specifically, K-IC fracture toughness of EP composites and ILSS of CF/EP composites at 77 K were enhanced by 26.0 and 31.4%, respectively, compared with the corresponding neat composites. The EP-PU component showed beta or gamma relaxation behavior at cryogenic condition and existed in form of scattered micro-spheres in cured EP matrix due to the phase separation. The riveting and bridging of MWCNTs-NH2 around EP-PU micro-spheres were considered to provide extraordinary synergy on the effective stress diversion and crack propagation inhibition at cryogenic condition through establishing the chemically bonded multi-scale interface.

引用

页数：10

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