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首页> 外文期刊>European Polymer Journal >Comparative study between core-shell and interpenetrating network structure polyurethane/polyacrylate composite emulsions
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Comparative study between core-shell and interpenetrating network structure polyurethane/polyacrylate composite emulsions

机译：核壳结构和互穿网络结构聚氨酯​​/聚丙烯酸酯复合乳液的比较研究

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Anionic aqueous polyurethane dispersion was prepared by using carboxyl acid group to make the polyurethane dispersible, and then nanograde core-shell and crosslinked IPN structure polyurethane/polyacrylate composite latex (PUA) were synthesized by soap-free emulsion polymerization method with polyurethane dispersion as seed. FTIR, DSC, dynamic light scattering, TEM, ESCA, TGA, electronic tensile machine were employed to investigate the structures and properties of the composite latex and their polymers. Meanwhile the core-shell composite PUA emulsion and the crosslinked IPN composite PUA emulsion were compared. The results showed that the particle morphology of PUA composite emulsion is inverted core-shell structure with polyacrylate as the core and with polyurethane as the shell. The morphology of the crosslinked PUA emulsion was multi-core structure. The surface in core-shell PUA contains rich PU phase. The phase structure of the crosslinked PUA is more uniform. Three transition temperatures are observed for the core-shell composite PUA, two transitions are observed for the film from the crosslinked PUA. The TGA curves of core-shell PUA and crosslinked PUA exhibit two stages, the first stage corresponds to the thermal decomposition of hard segments in seed polyurethane; the second stage corresponds to the decomposition of soft segments in PUA and decomposition of polyacrylate. With the increase of glycidyl methacrylate (GMA) amounts in PUA composite emulsions, the tensile strength of the PUA films as well as the average diameter of the PUA composite emulsion particles increase, the elongation at break of the PUA films decreases. (C) 2008 Elsevier Ltd. All rights reserved.
机译：利用羧酸基团制备可分散的阴离子型聚氨酯水分散体，然后以聚氨酯分散体为种子，通过无皂乳液聚合法合成纳米级核壳和交联的IPN结构聚氨酯​​/聚丙烯酸酯复合胶乳。用FTIR，DSC，动态光散射，TEM，ESCA，TGA，电子拉伸机研究了复合胶乳及其聚合物的结构和性能。同时比较了核壳复合PUA乳液和交联IPN复合PUA乳液。结果表明，PUA复合乳液的颗粒形态为以聚丙烯酸酯为核，聚氨酯为壳的倒核-壳结构。交联的PUA乳液的形态为多核结构。核-壳型PUA中的表面含有丰富的PU相。交联的PUA的相结构更均匀。对于核-壳复合PUA观察到三个转变温度，对于来自交联的PUA的膜观察到两个转变。核-壳型PUA和交联的PUA的TGA曲线表现出两个阶段，第一阶段对应于种子聚氨酯中硬链段的热分解;第二阶段对应于PUA中软链段的分解和聚丙烯酸酯的分解。随着PUA复合乳液中甲基丙烯酸缩水甘油酯（GMA）含量的增加，PUA薄膜的拉伸强度以及PUA复合乳液颗粒的平均直径增加，PUA薄膜的断裂伸长率降低。 （C）2008 Elsevier Ltd.保留所有权利。

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