Triple shape memory effects of cross-linked polyethylene/polypropylene blends with cocontinuous architecture.
Triple shape memory effects of cross-linked polyethylene/polypropylene blends with cocontinuous architecture.
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DOI：
10.1021/am400769j
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发表时间：
2013-06
影响因子：
9.5
通讯作者：
Jun Zhao;Min Chen;Xiaoyang Wang;Xi Chen;Zhenwen Wang;Z. Dang;Lan Ma;G. Hu;Feng-B. Chen
中科院分区：
文献类型：
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作者：
Jun Zhao;Min Chen;Xiaoyang Wang;Xi Chen;Zhenwen Wang;Z. Dang;Lan Ma;G. Hu;Feng-B. Chen
在本文中，系统地研究了在具有共连续结构的化学交联聚乙烯（PE）/聚丙烯（PP）共混物中观察到的三重形状记忆效应（SME）。典型的不混溶 PE/PP 共混物的共连续窗口是 PE (v(PE)) 的体积分数约为 1。 30-70 体积%。这种结构可以通过化学交联来稳定。不同的引发剂，2,5-二甲基-2,5-二（叔丁基过氧化）己烷（DHBP）、过氧化二枯基（DCP）与二乙烯基苯（DVB）偶联（DCP-DVB）及其混合物（DHBP/DCP-DVB）用于交联。根据差示扫描量热法 (DSC) 测量和凝胶分数计算，DHBP 产生最好的交联，DCP-DVB 最差，混合物 DHBP/DCP-DVB 介于两者之间。化学交联导致较低的熔化温度（Tm）和较小的熔化焓（ΔHm）。由 v(PE) 为 50 vol% 的共连续不混溶 PE/PP 共混物制备的三重形状记忆聚合物 (SMP) 在动态机械热分析 (DMTA) 和目视观察中显示出明显的三重 SME。这种具有共连续结构的化学交联不混溶共混物的新策略可用于设计和制备具有三重 SME 的新型 SMP。
In this paper, the triple shape memory effects (SMEs) observed in chemically cross-linked polyethylene (PE)/polypropylene (PP) blends with cocontinuous architecture are systematically investigated. The cocontinuous window of typical immiscible PE/PP blends is the volume fraction of PE (v(PE)) of ca. 30-70 vol %. This architecture can be stabilized by chemical cross-linking. Different initiators, 2,5-dimethyl-2,5-di(tert-butylperoxy)-hexane (DHBP), dicumylperoxide (DCP) coupled with divinylbenzene (DVB) (DCP-DVB), and their mixture (DHBP/DCP-DVB), are used for the cross-linking. According to the differential scanning calorimetry (DSC) measurements and gel fraction calculations, DHBP produces the best cross-linking and DCP-DVB the worst, and the mixture, DHBP/DCP-DVB, is in between. The chemical cross-linking causes lower melting temperature (Tm) and smaller melting enthalpy (ΔHm). The prepared triple shape memory polymers (SMPs) by cocontinuous immiscible PE/PP blends with v(PE) of 50 vol % show pronounced triple SMEs in the dynamic mechanical thermal analysis (DMTA) and visual observation. This new strategy of chemically cross-linked immiscible blends with cocontinuous architecture can be used to design and prepare new SMPs with triple SMEs.