Investigation on the recovery performance of olefin block copolymer/hexadecane form stable phase change materials with shape memory properties
Investigation on the recovery performance of olefin block copolymer/hexadecane form stable phase change materials with shape memory properties
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DOI：
10.1016/j.solmat.2014.10.023
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发表时间：
2015
影响因子：
6.9
通讯作者：
Qinglong Zhang;Kunpeng Cui;Jiachun Feng;J. Fan;Liangbin Li;Lingmei Wu;Qiang Huang
中科院分区：
文献类型：
--
作者：
Qinglong Zhang;Kunpeng Cui;Jiachun Feng;J. Fan;Liangbin Li;Lingmei Wu;Qiang Huang
本文系统地研究了一种同时具有形状记忆性能的新型形状稳定相变材料的回复性能。采用简单的溶胀法制备了以十六烷为储热材料，以烯烃嵌段共聚物(OBC)为载体的FSPCM。这种双功能材料具有优异的形状记忆性能，十六烷的质量分数达到70wt%，具有良好的储能能力。结果表明，在50%应变下的恢复性能明显好于较高应变下的恢复性能，而当应变为100%和200%时，含70wt%十六烷的复合材料的恢复性能优于纯OBC和30wt%的复合材料。用二维X射线散射法研究了十六烷掺入后的结构变化。实验结果表明，恢复性能与长周期的变化密切相关，表明双功能材料的不可逆变形可能源于OBC的片层碎裂，而大量十六烷的加入有利于抑制片层碎裂，从而提高恢复性能。我们相信，这一探索将有助于理解结构变化与形状记忆性能之间的关系，从而有助于调整双功能材料的性能，扩大其潜在的应用。
In this work, recovery performance of a novel sort of form stable phase change materials (FSPCMs) with simultaneously shape memory properties was investigated systematically. The FSPCMs comprising hexadecane as latent heat storage material and olefin block copolymer (OBC) as supporting material were prepared by simple swelling preparation method. This kind of difunctional materials exhibits fantastic shape memory properties with mass fraction of hexadecane reaching 70 wt%, which indicates excellent energy storage ability as well. It is found that the recovery performance under 50% strain is obviously better than that under higher strains for all the specimens investigated, while surprisingly, the composite with 70 wt% hexadecane exhibits better recovery performance than pure OBC as well as the composite with 30 wt% hexadecane at strains of 100 and 200%. The structural change brought by incorporation of hexadecane was explored within situtwo-dimensional X-ray scattering measurements. According to experiment results, we find that the recovery performance is closely correlated to change of long period, indicating the irreversible deformation of the difunctional materials may originate from lamellar fragmentation of OBC, while addition of massive hexadecane is beneficial to restrain lamellar fragmentation and thus improves the recovery performance. We believe this exploration may shed light on comprehending the relationship between structural change and shape memory performance, thus contributing to adjusting the properties of the difunctional materials and expanding their potential applications.