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首页> 外文期刊>Journal of Applied Polymer Science >Effect of deformation on the surface composition of multicomponent polymers. II. Blends of polydimethylsiloxane-polysulfone block copolymers in polychloroprene
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Effect of deformation on the surface composition of multicomponent polymers. II. Blends of polydimethylsiloxane-polysulfone block copolymers in polychloroprene

机译：变形对多组分聚合物表面组成的影响。二。聚二甲基硅氧烷-聚砜嵌段共聚物在聚氯丁二烯中的共混物

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摘要

The effect of uniaxial stretching on the surface composition of dilute blends of polydimethylsiloxane/polysulfone 2500/44,000 and 2500/3500 block copolymers in polychloroprene is studied using X-ray photoelectron spectroscopy. The surface of the initial (unstretched) blends is found to be covered by a discontinuous copolymer overlayer with a thickness greater than the XPS sampling depth. The stretching leads to a substantial drop in the extent of the copolymer surface segregation. For the 2500/ 3500 block copolymer, the dependence of the surface composition of the blends on the stretching degree is well described by a homogeneous deformation model, whereas for blends of the 2500/44,000 copolymer, the stretching of the copolymer overlayer lags noticeably behind that of the polychloroprene matrix. In the blends of the 2500/3500 copolymer, the stretching has practically no effect on the distribution of the copolymer components in the near-surface region. By contrast, the 2500/44,000 copolymer shows a substantial surface depletion of siloxane with stretching. (C) 1998 John Wiley & Sons. [References: 6]
机译：使用X射线光电子能谱研究了单轴拉伸对聚氯丁二烯中聚二甲基硅氧烷/聚砜2500 / 44,000和2500/3500嵌段共聚物的稀共混物的表面组成的影响。发现初始（未拉伸）共混物的表面被厚度大于XPS采样深度的不连续共聚物覆盖层覆盖。拉伸导致共聚物表面偏析的程度大大降低。对于2500/3500嵌段共聚物，共混物的表面组成对拉伸程度的依赖性已通过均质变形模型很好地描述，而对于2500 / 44,000共聚物的共混物，共聚物外层的拉伸明显落后于此。聚氯丁二烯基质。在2500/3500共聚物的共混物中，拉伸实际上对近表面区域中共聚物组分的分布没有影响。相比之下，2500 / 44,000共聚物在拉伸时显示出相当大的硅氧烷表面损耗。 （C）1998 John Wiley＆Sons。 [参考：6]

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