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首页> 外文期刊>Journal of Applied Polymer Science >Novel block ionomers. III. Mechanical and rheological properties
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Novel block ionomers. III. Mechanical and rheological properties

机译：新型嵌段离聚物。三，机械和流变性能

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摘要

Select rheological (dynamic viscoelastic) and mechanical properties of novel block cationomers and anionomers and their blends have been investigated. The block ionomers were linear di- and triblocks, and symmetric three-arm stars comprising hydrophobic polyisobutylene (PIB) blocks attached to ionized oly(methacrylic acid) (PMAA(-)X(+), where X+ = Na+, Zn2+) and poly[2-(dimethylamino)ethyl methacrylate] (PDMAEMA(+)I(-)) blocks. The specific structures investigated were the well-defined diblocks PIB-b-PMAA(-) and PIB-b-PDMAEMA(+) and their blends, the triblocks PMAA(-)-b-PIB-b-PMAA(-) and PDMAEMA(+)-b-PIB-b-PDMAEMA(+) and their blends, and the three-arm star anionomer Phi(D(PIB-b-PMAA(-))(3). For comparison, the properties of the precursor PIBs and unionized blocks have also been studied. Hydrogen bonding between the carboxyl groups of the PMAA blocks in PIB-b-PMAA diblocks leads to inverse micelles. Neutralization of the PMAA by Zn(AcO)(2) and quaternization of the PDMAEMA segments by CH3I in the triblock copolymers and star copolymers yielded ionic domains, which self-assemble and produce physical networks held together by coulumbic interaction. The physical/chemical characteristics of the domains control the viscoelastic behavior and mechanical properties of these block ionomers. The mechanical properties of the various block ionomers were significantly enhanced relative to the precursors, and they were thermally stable below the transition temperature. Further, the thermomechanical properties of these novel materials were satisfactory even above 200 degreesC. (C) 2003 Wiley Periodicals. [References: 17]
机译：研究了新型嵌段阳离子聚合物和阴离子聚合物及其共混物的选择流变学（动态粘弹性）和机械性能。嵌段离聚物是线性二嵌段和三嵌段，以及对称的三臂星形，包括连接到离子化的聚（甲基丙烯酸）（PMAA（-）X（+），其中X + = Na +，Zn2 +）和聚上的疏水性聚异丁烯（PIB）嵌段[甲基丙烯酸2-（二甲氨基）乙酯]（PDMAEMA（+）I（-））嵌段。研究的具体结构是定义明确的二嵌段PIB-b-PMAA（-）和PIB-b-PDMAEMA（+）及其混合物，三嵌段PMAA（-）-b-PIB-b-PMAA（-）和PDMAEMA （+）-b-PIB-b-PDMAEMA（+）及其混合物，以及三臂星形阴离子聚合物Phi（D（PIB-b-PMAA（-））（3）。还研究了PIB和工会化嵌段，PIB-b-PMAA二嵌段中PMAA嵌段的羧基之间的氢键导致反胶束Zn（AcO）（2）中和PMAA和PDMAEMA片段被季铵化。三嵌段共聚物和星形共聚物中的CH3I生成离子域，该域通过库伦相互作用自组装并形成物理网络，这些域的物理/化学特性控制着这些嵌段离聚物的粘弹性和机械性能。相对于前体，各种嵌段离聚物得到了显着增强，它们是在转变温度以下保持稳定。此外，这些新颖材料的热机械性质甚至在高于200℃也令人满意。 （C）2003 Wiley期刊。 [参考：17]

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