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首页> 外文期刊>Journal of Applied Polymer Science >Preparation and properties of new polyurethane gels with a stress-distributing function for medical applications
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Preparation and properties of new polyurethane gels with a stress-distributing function for medical applications

机译：具有应力分布功能的新型聚氨酯凝胶的制备和性能，用于医学应用

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The purpose of this study is to prepare new polyurethane gels that can be used as stress- or pressure-distributing materials, particularly by being combined with selective plasticizers for medical or clinical applications. Because low-molecular-weight plasticizer molecules in polymer gels intrinsically tend to migrate to the surface of the gels by the so-called entropy effect in polymer miscibility, the stress-distributing function may decrease gradually after a certain amount of time. Correspondingly, both the chemical nature of the plasticizer and polymer gels and the compatibility between the polymer segments and plasticizer should be deliberately considered as important factors in determining the thermophysical properties and stress-distributing performance of polymer gels. New polyurethane gels comprising separated phases of soft and hard segments, the glass-transition temperature of which was around the ambient temperature, were prepared, and selective plasticizers were combined to obtain an optimized formulation of gels for stress-relieving properties. The glassy-to-rubbery transition of semicrystalline hard segments occurring around the ambient temperature caused the rearrangement of chain conformations, leading to the reduction of the pressure applied to the surface; this indicated that the pressure buildup or loss was somewhat related to the heat regulation by thermal absorption and release in the phase-transition range. (c) 2006 Wiley Periodicals, Inc.
机译：这项研究的目的是制备可以用作应力或压力分布材料的新型聚氨酯凝胶，特别是与医学或临床应用中的选择性增塑剂结合使用时。由于聚合物凝胶中的低分子量增塑剂分子固有地倾向于通过聚合物混溶性中的所谓熵效应而迁移至凝胶表面，因此应力分配功能可能会在一定时间后逐渐降低。相应地，增塑剂和聚合物凝胶的化学性质以及聚合物链段和增塑剂之间的相容性都应被视为决定聚合物凝胶的热物理性质和应力分布性能的重要因素。制备了包含软段和硬段的分离相的新型聚氨酯凝胶，其玻璃化转变温度约为环境温度，然后将选择性增塑剂组合在一起，以获得具有缓解应力性能的优化凝胶配方。在环境温度附近发生的半结晶硬链段的玻璃态到橡胶态的转变引起链构象的重排，从而降低了施加在表面上的压力。这表明在相变范围内，压力的增加或损失与通过热吸收和释放引起的热调节有些相关。 （c）2006年Wiley Periodicals，Inc.

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