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首页> 外文期刊>Journal of Applied Polymer Science >Mechanical and morphological study of polyurethane/polystyrene interpenetrating polymer networks containing ionic groups
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Mechanical and morphological study of polyurethane/polystyrene interpenetrating polymer networks containing ionic groups

机译：含离子基团的聚氨酯/聚苯乙烯互穿聚合物网络的力学和形态研究

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The viscoelastic and mechanical properties and the morphology of polyurethane (PUR)/polystyrene (PS) interpenetrating polymer networks (IPNs) containing ionic groups have been investigated. Dynamic mechanical thermal analysis (DMTA) revealed a pronounced change in the viscoelastic properties upon the introduction of ionic groups. For the 70 : 30 and 60 : 40 PUR/PS IPN compositions, the DMTA data changed from a dominant PUR to a dominant PS loss factor peak. Higher intertransition loss factor values indicated a significant improvement of IPN component mixing with increasing ionic content. The stress at break values increased only moderately, whereas sharp rises in Young's modulus and hardness values were found at 2 wt % ionic groups. At the same time, the strain at break values decreased by half. Scanning and transmission electron microscopy (TEM) indicated a grossly phase-separated morphology for the 70 : 30 PUR/PS IPN without ionic groups. With increasing methacrylic acid (MAA) content, the PS phase domain sizes decreased. At 2 wt % of ionic groups, a TEM micrograph showed interconnected PS phase domains resembling a network structure. (C) 1998 John Wiley & Sons, Inc. [References: 43]
机译：研究了含离子基团的聚氨酯（PUR）/聚苯乙烯（PS）互穿聚合物网络（IPN）的粘弹性和力学性能以及形态。动态机械热分析（DMTA）显示，引入离子基团后，粘弹性的变化明显。对于70:30和60:40的PUR / PS IPN组合物，DMTA数据从主要的PUR变为主要的PS损耗因子峰。较高的过渡损失因子值表明，随着离子含量的增加，IPN组分混合得到了显着改善。断裂应力值仅适度增加，而在2 wt％的离子基团中，杨氏模量和硬度值急剧上升。同时，断裂应变值降低了一半。扫描和透射电子显微镜（TEM）指出，没有离子基团的70:30 PUR / PS IPN处于大致相分离的形态。随着甲基丙烯酸（MAA）含量的增加，PS相域尺寸减小。在2 wt％的离子基团下，TEM显微照片显示互连的PS相域类似网络结构。 （C）1998 John Wiley＆Sons，Inc. [参考：43]

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