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Deformation Mechanism Of Hard Elastic Polyethylene Film During Uniaxial Stretching: Effect Of Stretching Speed

Yuanfei Lin, Xueyu Li, Xiaowei Chen, Minfang An, Qianlei Zhang, Daoliang Wang, Weimin Chen, Panchao Yin, Lingpu Meng, Liangbin Li
Published 2019 · Materials Science
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Abstract The effects of stretching speed on the structural evolutions and mechanical behaviors of hard-elastic polyethylene films are studied with in-situ and ex-situ small-angle X-ray scattering (SAXS), scanning electronic microscope (SEM) and tensile tests in a wide stretching speed range (0.04–4 mm/s). Based on the evolutions of structural parameters extracted from SAXS results and the surface morphologies from SEM experiments, the stretching speed space can be divided into two regions with the boundary of 0.8 mm/s. Stress induced microphase separation of amorphous phase triggers the yielding behavior, which distributes more homogeneously with the increase of stretching speed. In region I, microphase separation tends to develop into cavities at smaller strain due to the thorough relaxation process of molecular chains in amorphous phases, which results in the inhomogeneous deformation during further stretching. In region II, the relaxation of molecular chains is not enough to response to the variation of external tensile field, thus inducing the uniform distribution of the occurrence of microphase separation.
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