PMMA/PEG Semi-interpenetrating Network Shape Memory Polymer with Phase Separation Structure
LI Xingjian1, BAI Baoshi1, LIU Sheng1, MIAO Yujie1, ZHENG Zhaohui2, DING Xiaobin2
1 School of Materials Science and Engineering,Linyi University,Linyi 276000,China 2 Chengdu Institute of Organic Chemistry,Chinese Academy of Sciences,Chengdu 610041,China
Abstract: In this work, in-situ polymerization of linear polyethylene glycol (PEG) with different molecular weights, methacrylate (MMA) monomers and crosslinking agent was carried out by a one-step approach, in order to prepare the shape memory polymer of poly(methyl methacrylate)/polyethylene glycol semi-interpenetrating networks (PMMA/PEG semi-IPNs) with phase separation structure. The thermal properties, dynamic mechanical properties and mechanical properties of PMMA/PEG semi-IPNs shape memory polymers with diverse molecular weights of PEG were investigated by differential scanning calorimetry (DSC), dynamic mechanical analysis (DMA) and stress-strain analysis. Furthermore, DMA was also employed to study the double shape memory effect and triple shape memory effect of the PMMA/PEG semi-IPNs. It was found that the PMMA/PEG semi-IPNs shape memory polymer showed both crystal phase of PEG and amorphous phase region of the composite network. Thanks to the melting temperature of PEG crystal that located in the glass transition temperature zone, the shape memory performance of the semi-IPNs could be synergistically enhanced, and both the fixed rate and the recovery rate of semi-IPNs exceeded 99%. Accordingly, exceptional triple shape memory effect can be achieved by taking these two thermal transitions as the switching phase of shape memory. Additionally, the mechanism of triple shape memory effect of PMMA/PEG semi-IPNs was expounded.
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