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首页> 外文期刊>Journal of Applied Polymer Science >Morphology, reversible phase crystallization, and thermal sensitive shape memory effect of cellulose whisker/SMPU nano-composites
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Morphology, reversible phase crystallization, and thermal sensitive shape memory effect of cellulose whisker/SMPU nano-composites

机译：纤维素晶须/ SMPU纳米复合材料的形貌，可逆相结晶和热敏形状记忆效应

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摘要

To investigate the morphology, crystallization properties of reversible phase and thermal sensitive shape memory properties of CW/SMPU (Cellulose Whisker/Shape Memory Polyurethane) nano-composite, the CW/SMPU nano-composite having CW contents of 0.1-3.8 wt % were prepared. SEM investigation showed the evolution of reversible phase morphology from spherolite crystallization structure to uniform matrix with tiny CW aggregates with the addition of CW into the SMPU matrix. DSC and isothermal crystallization kinetic method revealed the effect of CW on crystallization properties of reversible phase and fixed phase, suggesting that the effect of CW on the crystallization of hard segment phase is not comparable with thermal history; the more CW causes the higher crystallization rate of reversible phase; the crystallization mechanism of reversible phase in nano-composite gradually evolves to heterogeneous nucleation and crystal growth in two dimensions with the increase of CW content; the excellent nucleation effect of CW for the reversible phase leads to the drop of activity energy from 134.1 kJ/mol (N-0), to 95.1 kJ/mol (N-4). Cyclic tensile tests illustrate the addition of CW content can engender rapid shape fixity ability after a relative short cooling time; the shape fixity ratio of nano-composite and the control sample after sufficient cooling all can be identically high.
机译：为了研究CW / SMPU（纤维素晶须/形状记忆聚氨酯）纳米复合材料的形态，可逆相的结晶性质和热敏形状记忆性能，制备了CW / SMPU含量为0.1-3.8 wt％的CW / SMPU纳米复合材料。 SEM研究表明，向SMPU基质中添加了CW，可逆相形态从球晶结晶结构演变为具有微小CW聚集体的均匀基质。 DSC和等温结晶动力学方法揭示了连续波对可逆相和固定相结晶特性的影响，这表明连续波对硬链段相结晶的影响与热历史没有可比性。连续波越多，可逆相的结晶速率越高;随着CW含量的增加，纳米复合材料中可逆相的结晶机理逐渐演变为二维的异相成核和晶体生长。 CW对可逆相的出色成核作用导致活性能从134.1 kJ / mol（N-0）下降到95.1 kJ / mol（N-4）。循环拉伸试验表明，在相对较短的冷却时间后，添加连续波含量可以提高快速的形状固定能力。充分冷却后的纳米复合材料和对照样品的形状固定率都可以相同地高。

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