Constructing "Rigid-and-Soft" interlocking stereoscopic interphase structure of aramid fiber composites with high interfacial shear strength and toughness

被引：26

作者：

Lv, Junwei ^{[1
]}

Liu, Yushang ^{[1
]}

Qin, Yitian ^{[1
]}

Yin, Qian ^{[1
]}

Chen, Siyao ^{[1
]}

Cheng, Zheng ^{[1
]}

Yin, Junyi ^{[1
]}

Dai, Yu ^{[1
]}

Liu, Yang ^{[1
]}

Liu, Xiangyang ^{[1
]}

机构：

[1] Sichuan Univ, Coll Polymer Sci & Engn, State Key Lab Polymer Mat Engn, Chengdu 610065, Sichuan, Peoples R China

来源：

COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING | 2021年 / 145卷

基金：

中国国家自然科学基金;

关键词：

Aramid fiber; Interfacial shear strength; Interfacial shear toughness; Porous polyurea; CARBON-FIBER; DIRECT FLUORINATION; SURFACE; ADHESION;

D O I：

10.1016/j.compositesa.2021.106386

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

High strength and toughness seems like intrinsic conflicts in mechanical properties of materials, including composites interfaces. To solve this problem, we constructed a hierarchically structured interphase in aramid composites via in-situ grafting and foaming of polyurea on fiber surface and penetrating epoxy resin into the pores. As differential scanning calorimeter (DSC) and atomic force microscopic (AFM) confirmed, soft porous polyurea filled rigid resin matrix generated numerous covalent bonded interfaces and formed ?rigid-and-soft? interlocking stereoscopic interphase. Axial covalent bonds between fiber and polyurea, radial covalent bonds between polyurea and epoxy resin highly improved interfacial shear strength by 115.9%. Newly formed interfaces caused much higher energy consumption during interfacial failure is considered to enhance interfacial shear toughness (GIC) by 493.2%. Mathematical analysis and finite element analysis furtherly proved strengthening and toughening mechanisms, and we found the enhancement of GIC is also highly related to thickness of polyurea layer and pores? sizes.

引用

页数：9

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