Bi Hongjie, Xu Min, Ye Gaoyuan, Guo Rui, Cai Liping, Ren Zechun
Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education), Material Science and Engineering College, Northeast Forestry University, Harbin 150040, China.
Mechanical and Energy Engineering Department, University of North Texas, Denton, TX 76201, USA.
Polymers (Basel). 2018 Nov 7;10(11):1234. doi: 10.3390/polym10111234.
In this study, a series of heat-induced shape memory composites was prepared by the hot-melt extrusion and three-dimensional (3D) printing of thermoplastic polyurethane (TPU) using wood flour (WF) with different contents of EPDM--MAH. The mechanical properties, microtopography, thermal property analysis, and heat-induced shape memory properties of the composites were examined. The results showed that, when the EPDM--MAH content was 4%, the tensile elongation and tensile strength of the composites reached the maximum value. The scanning electron microscopy and dynamic mechanical analysis results revealed a good interface bonding between TPU and WF when the EPDM--MAH content was 4%. The thermogravimetric analysis indicated that the thermal stability of TPU/WF composites was enhanced by the addition of 4% EPDM--MAH. Heat-induced shape memory test results showed that the shape memory performance of composites with 4% EPDM--MAH was better than that of unmodified-composites. The composites' shape recovery performance at a temperature of 60 °C was higher than that of the composites at ambient temperature. It was also found that, when the filling angle of the specimen was 45°, the recovery angle of the composites was larger.
在本研究中，通过热熔融挤出以及使用含有不同含量乙烯-丙烯-二烯烃橡胶-马来酸酐（EPDM-MAH）的木粉（WF）对热塑性聚氨酯（TPU）进行三维（3D）打印，制备了一系列热致形状记忆复合材料。对复合材料的力学性能、微观形貌、热性能分析以及热致形状记忆性能进行了研究。结果表明，当EPDM-MAH含量为4%时，复合材料的拉伸伸长率和拉伸强度达到最大值。扫描电子显微镜和动态力学分析结果显示，当EPDM-MAH含量为4%时，TPU与WF之间具有良好的界面结合。热重分析表明，添加4%的EPDM-MAH可提高TPU/WF复合材料的热稳定性。热致形状记忆测试结果表明，含4% EPDM-MAH的复合材料的形状记忆性能优于未改性的复合材料。复合材料在60℃时的形状恢复性能高于其在室温下的性能。还发现，当试样的填充角度为45°时，复合材料的恢复角度更大。
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