Shape memory behavior of poly(methyl methacrylate)-graft-poly(ethylene glycol) copolymers
Shape memory behavior of poly(methyl methacrylate)-graft-poly(ethylene glycol) copolymers
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DOI：
10.1016/j.polymer.2009.12.021
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发表时间：
2010-02
期刊：
影响因子：
4.6
通讯作者：
K. Inomata;K. Nakagawa;Chieko Fukuda;Yoshimi Nakada;H. Sugimoto;E. Nakanishi
中科院分区：
文献类型：
--
作者：
K. Inomata;K. Nakagawa;Chieko Fukuda;Yoshimi Nakada;H. Sugimoto;E. Nakanishi
本文研究了聚甲基丙烯酸甲酯-接枝聚乙二醇（PMMA-g-PEG）接枝共聚物的形状记忆行为。在形状记忆试验中，样品在玻璃化转变温度（Tg）以上从其原始形状变形为临时形状，在Tg以下冷却以固定临时形状，随后在Tg以上加热以自发恢复到原始形状。通过将PEG接枝到PMMA主链上，形状记忆能力比PMMA均聚物显著增强。形状回复率随变形温度的升高而降低。考虑到PMMA-g-PEG中主链和侧链的良好相容性，这种形状记忆能力可能与梳状接枝共聚物通过链缠结形成的物理交联网络结构有关。应力松弛测量进行了研究，以确认接枝链的形状记忆行为的效果。
This paper describes a shape memory behavior of graft copolymers poly(methyl methacrylate)-graft-poly(ethylene glycol) (PMMA-g-PEG). In shape memory test, the sample was deformed from its original shape to a temporary shape above glass transition temperature (Tg), cooled below Tgto fix the temporary shape, and subsequently heated above Tgfor spontaneous recovery to the original shape. By grafting PEG onto PMMA backbone, shape memory ability was drastically enhanced than PMMA homopolymer. The shape recovery ratio was decreased with the increase in the shape deformation temperature. With considering a good miscibility of backbone and side chain in PMMA-g-PEG, this shape memory ability may be related to a physically cross-linked network structure by chain entanglement of the comb-like graft copolymer. Stress relaxation measurements were investigated in order to confirm the effect of the graft chains on the shape memory behavior.