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首页> 外文期刊>Polymers for advanced technologies >Morphology-controlled multiple one- and twoway shape-memory behavior of cross-linked polyethylene/poly(ε-caprolactone) blends
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Morphology-controlled multiple one- and twoway shape-memory behavior of cross-linked polyethylene/poly(ε-caprolactone) blends

机译：交联聚乙烯/聚（ε-己内酯）共混物的形态控制多个单向和双向形状记忆行为

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摘要

The capability of phase morphology of covalent networks on the basis of crystallizable polymer blends to control their multiple shape-memory (SM) behavior was proven, especially for invertible two-way SM effect, which is observed as an anomalous elongation of a sample under constant load during the non-isothermal crystallization. In order to achieve a triple-shape one- and two-way behavior, a set of binary blends with different contents of high-density polyethylene and poly(ε-caprolactone) and one 50/50 blend of ethylene-octene copolymer and transpolyoctenamer cross-linked by peroxide were prepared. The considerable enthalpic effects in temperature ranges of crystallization and melting of both blend components point to possible softening/hardening of discussed blends caused by non-isothermal melting/crystallization at heating/cooling, respectively. The two-way SM behavior was investigated in tensile mode under constant load during cooling and heating sequentially. It is quite obvious that the distinct manifestation of triple-SM behavior is possible only when a continuous phase of blend has lower crystallization/melting temperatures in comparison with dispersed phase. By contrast, if crystallization/melting temperatures of dispersed phase are lower, then its ability to change a shape is suppressed by already solidified continuous phase. Obtained results allow conclude the following: first, the performances of both one- and two-way SME are enhanced with increasing cross-link density and crystallinity of polymer network as well as due to selection of optimal load; second, the key to improve the multiple SM behavior of polymer blends is further optimization of their phase morphology, especially better separation/decoupling of blend phases.
机译：事实证明，基于可结晶聚合物共混物的共价网络的相态形态能够控制其多重形状记忆（SM）行为，特别是对于可逆的双向SM效应，这种现象被观察为恒定条件下样品的异常伸长。非等温结晶过程中的载荷。为了实现三重形状的单向和双向行为，一组具有不同含量的高密度聚乙烯和聚（ε-己内酯）的二元共混物，以及乙烯-辛烯共聚物和反式聚辛烯交联物的50/50共混物制备了用过氧化物连接的化合物。两种共混物组分的结晶和熔融的温度范围内的显着焓效应表明，分别由加热/冷却时的非等温熔融/结晶引起的所讨论的共混物可能的软化/硬化。在冷却和加热过程中，在恒定载荷下以拉伸模式研究了双向SM行为。很明显，只有当共混物的连续相与分散相相比具有较低的结晶/熔融温度时，才可能出现三重SM行为的明显表现。相反，如果分散相的结晶/熔融温度较低，则已经固化的连续相将抑制其改变形状的能力。获得的结果可以得出以下结论：首先，单向和双向SME的性能随着聚合物网络交联密度和结晶度的增加以及最佳负载的选择而提高。其次，改善聚合物共混物多重SM行为的关键是进一步优化它们的相形态，尤其是更好的共混物相分离/解耦。

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