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聚醚氨酯热塑弹性体是属于(AB)n类型的线型多嵌段共聚物,包括交替的硬段和软段单元.自从1966年Cooper和Tobolsky首先提出聚氨酯具有微相分离的本体结构之假设以后,至今已有大量文献报道了这类材料结构形态与性能关系的研究结果. Wilkes和Koberstein等使用SAXS研究了聚氨酯体系的形态特征.一般认为,聚氨酯材料的微相结构包括一个叠层状或类似叠层状形态,由相分离的软段和硬段组成,平均尺寸为100A的数量级,在软硬段微区之间还存在一相混合的过渡区,其厚度可以从几个埃至几十个埃.然而,SAXS虽然能够高分辨地给出多相体系相分离情况的定
Polyether urethane thermoplastic elastomers are linear multiblock copolymers belonging to the (AB) n type, comprising alternating hard and soft segment units. Since Cooper and Tobolsky first proposed in 1966 that polyurethanes have a microsecond-separated bulk structure Since the hypothesis, so far a large number of literature reports on the structure of such materials and performance of the relationship between the results.Willkes and Koberstein use SAXS studied the morphological characteristics of the polyurethane system is generally believed that the polyurethane material, the micro-phase structure includes a laminated Shaped or similar lamellar morphology consisting of soft and hard phase separated phases with an average size on the order of 100A and the presence of a one-phase mixed transition between hard and soft domains with a thickness ranging from a few Angstroms To tens of angstroms.However, although SAXS can give high-resolution multi-phase phase separation system