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首页> 外文期刊>Journal of Applied Polymer Science >Melt spun thermoresponsive shape memory fibers based on polyurethanes: Effect of drawing and heat-setting on fiber morphology and properties
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Melt spun thermoresponsive shape memory fibers based on polyurethanes: Effect of drawing and heat-setting on fiber morphology and properties

机译：基于聚氨酯的熔纺热敏形状记忆纤维：拉伸和热定形对纤维形态和性能的影响

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摘要

Thermoresponsive shape memory (SMP) fibers were prepared by melt spinning from a polyester polyol-based polyurethane shape memory polymer (SMP) and were subjected to different postspinning operations to modify their structure. The effect of drawing and heat-setting operations on the shape memory behavior, mechanical properties, and structure of the fibers was studied. In contrast to the as-spun fibers, which were found to show low stress built up on straining to temporary shape and incomplete recovery to the permanent shape, the drawn and heat-set fibers showed significantly higher stresses and complete recovery. The fibers drawn at a DR of 3.0 and heat-set at 100 degrees C gave stress values that were about 10 times higher than the as-spun fibers at the same strain and showed complete recovery on repeated cycling. This improvement was likely due to the transformation brought about in the morphology of the permanent shape of the SMP fibers from randomly oriented weakly linked regions of hard and soft segments to the well-segregated, oriented and strongly H-bonded regions of hard-segments. (c) 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 2172-2182, 2007
机译：通过从聚酯多元醇基聚氨酯形状记忆聚合物（SMP）熔融纺丝制备热敏形状记忆（SMP）纤维，并对其进行不同的后纺操作以改变其结构。研究了拉伸和热定型操作对形状记忆行为，机械性能和纤维结构的影响。与初生纤维相反，初生纤维显示出在应变变形为临时形状时产生的低应力，而恢复为永久形状时不完全恢复，而拉伸和热定形的纤维显示出明显更高的应力和完全恢复。以3.0的DR拉伸并在100摄氏度下热定型的纤维所产生的应力值是相同应变下初纺纤维的应力值约10倍，并且在重复循环中显示出完全恢复。这种改善可能是由于SMP纤维永久形状的形态从硬段和软段的随机定向的弱连接区域转变为硬段的良好隔离，定向和强H键合区域所引起的。 （c）2006 Wiley Periodicals，Inc. J Appl Polym Sci 103：2172-2182，2007

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