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Influence of Graphene Oxide on Thermally Induced Shape Memory Behavior of PLA/TPU Blends: Correlation with Morphology, Creep Behavior, Crystallinity, and Dynamic Mechanical Properties
Macromolecular Materials and Engineering ( IF 3.9 ) Pub Date : 2020-12-29 , DOI: 10.1002/mame.202000576
Fatemeh Azadi 1 , Seyed Hassan Jafari 1 , Hossein Ali Khonakdar 2, 3 , Mohammad Arjmand 4 , Udo Wagenknecht 3 , Volker Altstädt 5
Affiliation  

In this study, shape memory is thermally induced in a series of graphene oxide (GO) filled poly(lactic acid)/thermoplastic polyurethane (PLA/TPU) blends, prepared via melt mixing process, and their shape recovery and shape fixity are measured, and the results are correlated with morphology, dynamic mechanical properties, crystallinity and creep recovery behavior. Morphological analysis by scanning and transmission electron microscopy reveals that the blends are immiscible, and GO platelets are mainly localized in the TPU phase of the blends, which lead to smaller and more elongated TPU droplets with improved interfacial adhesion being responsible for the improved shape recovery performance compared to the unfilled blend. A systematic enhancement found in storage and Young's modulus, tensile strength, creep resistance and creep recovery, and cold crystallinity as a result of GO inclusion are in agreement with the improved shape recovery, shape fixity and overall shape memory performance of the filled systems. The developed PLA/TPU/GO nanocomposites with highly improved mechanical properties can be utilized as a new class of environmentally friendly shape memory materials for a broad range of applications.

中文翻译:

氧化石墨烯对PLA / TPU共混物热诱导形状记忆行为的影响:与形态,蠕变行为,结晶度和动态力学性能的关系

在这项研究中,形状记忆是在通过熔融混合工艺制备的一系列填充氧化石墨烯(GO)的聚乳酸/热塑性聚氨酯(PLA / TPU)共混物中热诱导的,并测量了它们的形状恢复和形状固定性,结果与形态,动态力学性能,结晶度和蠕变恢复行为相关。扫描和透射电子显微镜的形态学分析表明,共混物是不溶混的,GO血小板主要位于共混物的TPU相中,这导致TPU液滴更小,更细长,界面粘合性得到改善,从而改善了形状恢复性能。与未填充的混合物相比 在存储和杨氏模量,抗张强度,抗蠕变性和蠕变回复率方面的系统性增强,GO夹杂物的结晶度和冷结晶度与填充系统改善的形状恢复性,形状固定性和整体形状记忆性能一致。具有高度改善的机械性能的已开发的PLA / TPU / GO纳米复合材料可用作新型环保形状记忆材料,可用于广泛的应用领域。
更新日期:2021-02-15
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