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首页> 外文期刊>Journal of Applied Polymer Science >Crosslinkable poly(vinyl acetate)/clay nanocomposite films cast from soap-free emulsion-polymerized latices
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Crosslinkable poly(vinyl acetate)/clay nanocomposite films cast from soap-free emulsion-polymerized latices

机译：由无皂乳液聚合胶乳制成的可交联聚醋酸乙烯酯/粘土纳米复合薄膜

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摘要

Exfoliated poly(vinyl acetate) (PVAc)/montmorillonite (MMT) and poly(vinyl acetate-co-glycidyl methacrylate) [P(VAc-co-GMA)]/MMT nanocomposite latices, prepared by soap-free emulsion polymerization, were able to be cast into films, and the latter was crosslinked with diethylene triamine as a curing agent. The glass-transition temperature of the crosslinked P(VAc-co-GMA)/MMT nanocomposite films was higher than that of the PVAc/MMT counterparts. Although both the Young's modulus and yield stress for the PVAc/MMT nanocomposite films increased with the content of MMT, the extent of the increase was greater for the crosslinked P(VAc-co-GMA)/MMT nanocomposites. The exfoliated MMT nanoplatelets retarded the cold drawing of the PVAc matrix during tensile testing, resulting in a decrease of the elongation. However, crosslinked P(VAc-co-GMA)/MMT nanocomposite films still had more elongation than the PVAc/MMT counterparts. The drastic decrease of the water vapor permeability with the content of MMT for both types of nanocomposite films suggested that the exfoliated MMT nanoplatelets were dispersed evenly and flattened completely along the film surface. After all the nanocomposite film samples were burned, the inflammable residues for the samples with an MMT content higher than 5 wt% could preserve the original film profile with stiffness, and this indicated that the exfoliated MMT nanoplatelets acted as inflammable scaffolds. (C) 2008 Wiley Periodicals, Inc.
机译：通过无皂乳液聚合制备的剥落型聚醋酸乙烯酯（PVAc）/蒙脱土（MMT）和聚醋酸乙烯酯-甲基丙烯酸缩水甘油酯（P（VAc-co-GMA）] / MMT纳米复合胶乳将其浇铸成膜，然后用二亚乙基三胺作为固化剂进行交联。交联的P（VAc-co-GMA）/ MMT纳米复合膜的玻璃化转变温度高于PVAc / MMT对应物的玻璃化转变温度。尽管PVAc / MMT纳米复合材料薄膜的杨氏模量和屈服应力均随MMT含量的增加而增加，但交联的P（VAc-co-GMA）/ MMT纳米复合材料的增加幅度更大。在拉伸试验中，剥落的MMT纳米片阻止了PVAc基质的冷拉伸，从而导致伸长率降低。但是，交联的P（VAc-co-GMA）/ MMT纳米复合膜仍具有比PVAc / MMT对应物更大的伸长率。两种类型的纳米复合膜的水蒸气透过率均随着MMT含量的急剧下降表明，剥落的MMT纳米片均匀地分散并沿膜表面完全展平。燃烧所有纳米复合薄膜样品后，MMT含量高于5 wt％的样品的易燃残留物可以保留原始膜的轮廓并具有刚度，这表明脱落的MMT纳米片充当了易燃的支架。 （C）2008 Wiley期刊公司

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