Tuning the dual- and triple-shape-memory effect of thermoplastic polyurethane/polylactic acid/poly(propylene carbonate) ternary blends via morphology control
Tuning the dual- and triple-shape-memory effect of thermoplastic polyurethane/polylactic acid/poly(propylene carbonate) ternary blends via morphology control
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通过形态控制调节热塑性聚氨酯/聚乳酸/聚（碳酸丙烯酯）三元共混物的双重和三重形状记忆效应
DOI：
10.1016/j.polymer.2022.124546
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发表时间：
2022-01
期刊：
影响因子：
4.6
通讯作者：
Shaoyun Guo
中科院分区：
文献类型：
--
作者：
Bingbing Zeng;Meiyu Cao;Jiabin Shen;Keke Yang;Yu Zheng;Shaoyun Guo
本文采用直接熔融共混的方法，制备了由热塑性聚氨酯（TPU）、聚乳酸（PLA）和聚碳酸丙烯（PPC）组成的三元形状记忆共混物。PLA和PPC由于相容性、粘度和表面张力的不同，在TPU和LPC的质量比固定为50:50的情况下，聚并形成复合相（LPC），然后与TPU组装形成特殊的共连续结构，这是首先根据扩散系数理论预测的，然后通过SEM观察证实。此外，PLA和PPC作为开关的形态以及TPU和LPC之间的界面面积可以通过简单地调整LPC的组成来定制，从而导致可调谐的双形状和三形状记忆效应（DSME和TSME）。对于将整个LPC作为单个开关的DSME，随着PLA含量的降低，形状固定率和恢复率均下降。结果表明，用PPC替代PLA不仅削弱了LPC保持临时变形的机械支撑，而且减小了界面面积，从而减小了TPU对形状恢复的驱动作用。当PLA和PPC分别作为记忆两种临时形状的开关时，可以实现TSME，并且由相形态控制的性能在不同阶段表现出不同的变化趋势。通过对比，PLA含量为15%的共混物的TSME效果最好，并对其进行了定性和定量表征。该策略在制造具有可调多形状记忆性能的聚合物材料方面的简单性意味着可扩展到其他聚合物对。
In this work, the ternary shape-memory blends consisting of thermoplastic polyurethane (TPU), polylactic acid (PLA), and poly(propylene carbonate) (PPC) were prepared via direct melt blending. Due to the different compatibility, viscosity and surface tension, PLA and PPC coalesce into a compound phase (LPC) and then assembled with TPU to form a special co-continuous structure in each blend as the mass ratio of TPU and LPC fixed at 50:50, which was first predicted based on the spreading coefficient theory and then confirmed by SEM observation. Moreover, the morphology of PLA and PPC serving as switches and the interfacial area between TPU and LPC can be tailored through simply adjusting the composition of LPC, leading to the tunable dual- and triple-shape-memory effects (DSME and TSME). For DSME via regarding the whole LPC as the single switch, both the shape fixation and recovery ratios decline with decreasing the PLA content. It is revealed that replacing PLA with PPC not only weakens the mechanical support from LPC for holding temporary deformation but also reduces the interfacial area and thus the driving effect from TPU for shape recovery. When PLA and PPC respectively act as the switch to memorize the two temporary shapes, TSME can be realized and the property governed by phase morphology exhibits diverse variation trends at the different stages. By comparison, the blend containing 15 wt% PLA showed the best TSME, which was characterized both qualitatively and quantitatively. The simplicity of this strategy in fabricating polymeric materials with tunable multiple-shape-memory performances implies the scalability to other polymer pairs.
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