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In situ small angle X‐ray scattering study on structural evolution of crosslinked polytetrafluoroethylene during deformation
Author(s) -
Li Xiaoyun,
Tian Feng,
Yang Chunming,
Tang Zhongfeng,
Miao Xiaran,
Wu Guozhong,
Li Xiuhong,
Wang Jie,
Li Liangbin
Publication year - 2014
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.39883
Subject(s) - small angle x ray scattering , lamellar structure , materials science , polytetrafluoroethylene , composite material , ultimate tensile strength , lamella (surface anatomy) , deformation (meteorology) , crystallinity , scattering , amorphous solid , yield (engineering) , crystallography , optics , chemistry , physics
The structural evolution of virgin and crosslinked polytetrafluoroethylene (PTFE) during stretching was studied by in situ synchrotron small‐angle X‐ray scattering (SAXS). Both yield and tensile stress of crosslinked PTFE increased with increasing crosslinking density. During stretching, for virgin PTFE, amorphous chains gradually turned to tensile direction at early stage, perpendicularly arranged lamellar stacks appeared at high strains (>140%). While for crosslinked PTFE, lamellar structure was observed even at lower strains; with increasing irradiation dose, the lamellar structure became obvious and the long period decreased. Four‐point SAXS patterns were observed only in 3000kGy‐dosed PTFE during deformation, which indicated that an alternately tilted lamella arrangement called herringbone structure was formed. Radiation dose induces crosslinked networks formed, which can carry part of local stress during deformation, resulting in the increase of yield and tensile stress. Crosslinking density is an important factor on structural evolution. In addition, a deformation mechanism of different crosslinked PTFE is proposed. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 39883.