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Reversible Plasticity Shape Memory Effect in SEBS/Crystallizable paraffin: Influence of paraffin content

Chinese Journal of Polymer Science 2022年第12期40卷 1697-1705,I0011页

作者： Shao-Quan Zhao Jia-Chun Feng State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200433China Yiwu Research Institute of Fudan University Yiwu 322000China

Polymers with reversible plasticity shape memory effect(RPSME)have attracted considerable attention due to their simple programming and large ***,the exact mechanisms of RPSME are still not thoroughly *** this work,the RPSME of SEBS/crystallizable paraffin was investigated by comparatively analyzing the performances and microstructures of samples with different paraffin *** was found the shape fixing ratios(Rfs)of samples increased with the paraffin content,and interestingly,a significant improvement in Rf was observed when the paraffin content exceeded 60 wt%.Tensile test results showed that the deformation characteristics of samples changed from elastic to plastic as the paraffin content increased above 60 wt%.By exploring the crystallization behaviors of paraffin in various SEBS/paraffin samples,it was revealed that the microstructures of SEBS/paraffin were different when the paraffin content was below 50 wt%and above 60 wt%.In samples with low paraffin content(below 50 wt%),nearly all paraffin was co-crystallized with ethylene-co-butylene(EB)chains and its crystallization was severely restricted;while in samples with high paraffin content(above 60 wt%),“excess”paraffin appeared and this part of paraffin crystallized on the template of the EB/paraffin co-crystals,which might be responsible for the elastic-to-plastic transition and the sharp increase in *** on the above results,a possible structural model was proposed to explain the exact mechanism of RPSME in SEBS/paraffin.

关键词： Reversible plasticity shape memory effect Poly(styrene-b-(ethylene-co-butylene)-b-styrene) Crystallizable paraffin paraffin content

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