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首页> 外文期刊>Journal of Applied Polymer Science >Tailoring of phase-segregation structures in two-soft-segment urethane/urea polymer membranes
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Tailoring of phase-segregation structures in two-soft-segment urethane/urea polymer membranes

机译：两段软聚氨酯/尿素聚合物膜中相分离结构的定制

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The synthesis of two-soft-segment urethane/ urea polymeric membranes with various proportions of the two soft segments, poly(propylene oxide) and polybutadiene, yielded very distinct morphologies depending on the degree of phase segregation. The morphologies were identified with transmission electron microscopy. With a low concentration of polybutadiene, this soft segment segregated into ellipsoidal microdomains dispersed in a poly(propylene oxide) matrix. With an intermediate concentration of polybutadiene, the morphology was characterized by nanoscale phase separation and could be described as a disordered, wormlike domain structure. With a high concentration of polybutadiene, a single phase was observed. This was attributed to molecular mixing of the two soft segments and was associated with membranes that under the application of a shear stress developed bands that efficiently scattered light. These bands were identified by field emission scanning electron microscopy with a periodicity of approximately 4-5 mu m. The change in the membrane morphology from microscale phase segregation to nanoscale phase segregation led to very different membrane gas-permeation properties, that is, a reduction of the CO2 permeability from 191 to 90 Barrer. (C) 2006 Wiley Periodicals, Inc. J Appl Polyrn Sci 103: 315-320, 2007
机译：具有不同比例的两个软链段的聚（环氧丙烷）和聚丁二烯的两个软链段的聚氨酯/尿素聚合物膜的合成产生了非常不同的形态，具体取决于相分离的程度。用透射电子显微镜鉴定形态。在聚丁二烯浓度低的情况下，该软链段分离成分散在聚环氧丙烷基质中的椭圆形微区。在中等浓度的聚丁二烯的情况下，其形态以纳米级相分离为特征，可以描述为无序的蠕虫状结构域。在高浓度的聚丁二烯下，观察到单相。这归因于两个软链段的分子混合，并与在剪切应力作用下形成能有效散射光的条带的膜有关。这些带通过场发射扫描电子显微镜以约4-5μm的周期识别。膜形态从微米级相分离到纳米级相分离的变化导致膜的气体渗透特性截然不同，即将CO2的渗透率从191 Barrer降低到90 Barrer。 （C）2006 Wiley Periodicals，Inc. J Appl Polyrn Sci 103：315-320，2007

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