The effect of microstructural evolution during deformation on the post-yielding behavior of self-associated polyamide blends

	The effect of microstructural evolution during deformation on the post-yielding behavior of self-associated polyamide blends
	Wang, Lili 1,2; Dong, Xia 1,2; Huang, Miaoming 1; Muller, Alejandro J.3,4,5; Wang, Dujin 1,2
刊名	POLYMER
	2017-05-19
卷号	117 页码:231-242
关键词	Lcpas Microstructure Evolution Deformation Mechanism
英文摘要	The deformation-induced microstructure evolution of self-associated polymer blends, i.e., long chain polyamide alloys (LCPAs), was investigated and correlated with their mechanical performance. A PA1012 (soft phase)/PA612 (hard phase) blend was selected for this study. It is interesting that both Young's modulus and yield stress exhibit a nearly linear dependence with composition, which follows a simple additive mixing law. With strong intra-associated hydrogen bonds, the LCPAs studied here were found to be immiscible, but mechanically compatible because of the strong interfacial adhesion of the two constituents. Moreover, when the blend was deformed close to or above its glass transition temperature (T-g), the simultaneous occurrence of fracture reinforcement and toughness was achieved, which was defined as "soft phase-reinforcing-hard phase" (SRH). On the other hand, below T-g, a "hard phase-reinforcing-soft phase" (HRS) mechanical behavior was identified at the expense of elongation at break. Upon uniaxial deformation above T-g, the PA1012 component imparted to the blends a superior fracture stress due to strong strain-induced crystallization effect and the subsequent formation of a microfibrillar structure. However, the PA612 phase contributed little to the improvement of the mechanical properties of the blends. The large discrepancy in the contributions of the blend components to the fracture stress, primarily originates from the flexible nature of the PA1012 chains and the thin crystals nucleated by the already crystallized PA612 phase. However, below Tg, tilt, slippage and fragmentation of the lamellae occur in both phases, which are accompanied by apparent void formation and directly lead to catastrophic fracture. Considering the higher density of hydrogen bonds in PA612, the PA612-rich blends displayed higher fracture stresses as compared to the rest of the compositions. Overall, the distinctive microstructure evolution of the constituent phases and their roles in stress enhancement at large strains have been successfully established. The results presented here shed light on the deformation mechanism of self-associated polymers and offer a new pathway for the development of mechanically reinforcing materials. (C) 2017 Elsevier Ltd. All rights reserved.
语种	英语
内容类型	期刊论文
源URL	[http://ir.iccas.ac.cn/handle/121111/38414]
专题	化学研究所_工程塑料实验室
作者单位	1.Chinese Acad Sci, Beijing Natl Lab Mol Sci, CAS Key Lab Engn Plast, Inst Chem, Beijing 100190, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China 3.Univ Basque Country UPV EHU, Fac Chem, POLYMAT, Paseo Manuel de Lardizabal 3, Donostia San Sebastian 20018, Spain 4.Univ Basque Country UPV EHU, Fac Chem, Polymer Sci & Technol Dept, Paseo Manuel de Lardizabal 3, Donostia San Sebastian 20018, Spain 5.Basque Fdn Sci, Ikerbasque, Bilbao, Spain
推荐引用方式 GB/T 7714	Wang, Lili,Dong, Xia,Huang, Miaoming,et al. The effect of microstructural evolution during deformation on the post-yielding behavior of self-associated polyamide blends[J]. POLYMER,2017,117:231-242.
APA	Wang, Lili,Dong, Xia,Huang, Miaoming,Muller, Alejandro J.,&Wang, Dujin.(2017).The effect of microstructural evolution during deformation on the post-yielding behavior of self-associated polyamide blends.POLYMER,117,231-242.
MLA	Wang, Lili,et al."The effect of microstructural evolution during deformation on the post-yielding behavior of self-associated polyamide blends".POLYMER 117(2017):231-242.