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首页> 外文期刊>Journal of Applied Polymer Science >STUDIES ON THERMALLY STIMULATED SHAPE MEMORY EFFECT OF SEGMENTED POLYURETHANES
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STUDIES ON THERMALLY STIMULATED SHAPE MEMORY EFFECT OF SEGMENTED POLYURETHANES

机译：分段聚氨酯热刺激形状记忆效应的研究

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The shape memory behavior of a series of polycaprolactone/methane diisocyanate/butanediol (PCL/MDI/BDO) segmented polyurethanes of different composition was studied. The molecular weight of PCL diols was in the range of 1600-7000, and the hard segment content varied from 7.8 to 27% by weight. Film specimens for shape memory measurements were prepared by drawing at temperatures above the melting temperature of the soft segment crystals and subsequent quick cooling to room temperature under constrained conditions. The shape memory process was observed and recorded in a heating process. Parameters describing the recovery temperature, ability, and speed were used to study the influence of structure and processing conditions an the shape memory behavior of the sample. It was found that the high crystallinity of the soft segment regions at room temperature and the formation of stable hard segment domains acting as physical crosslinks in the temperature range above the melting temperature of the soft segment crystals are the two necessary conditions for a segmented copolymer with shape memory behavior. The response temperature of shape memory is dependent on the melting temperature of the soft segment crystals. The final recovery rate and the recovery speed are mainly related to the stability of the hard segment domains under stretching and are dependent on the hard segment content of the copolymers. (C) 1997 John Wiley & Sons, Inc. [References: 8]
机译：研究了一系列不同组成的聚己内酯/甲烷二异氰酸酯/丁二醇（PCL / MDI / BDO）嵌段聚氨酯的形状记忆行为。 PCL二醇的分子量在1600-7000的范围内，并且硬链段含量在7.8至27重量％之间变化。通过在高于软链段晶体熔化温度的温度下拉伸并随后在受限条件下快速冷却至室温来制备用于形状记忆测量的薄膜样品。观察形状记忆过程并在加热过程中记录。描述恢复温度，能力和速度的参数用于研究结构和加工条件以及样品的形状记忆行为的影响。发现在高于软链段晶体熔融温度的温度范围内，在室温下软链段区域的高结晶度和稳定的硬链段结构域的形成是物理交联的，这是链段共聚物与丙烯酰胺共存的两个必要条件。形状记忆行为。形状记忆的响应温度取决于软段晶体的熔化温度。最终的回收率和回收速度主要与拉伸时硬链段域的稳定性有关，并且取决于共聚物的硬链段含量。 （C）1997 John Wiley＆Sons，Inc. [参考：8]

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