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Effects of mixing ratio and monomer composition on morphology and mechanical properties of SMI/SAN blends

机译:混合比和单体组成对SMI / SAN共混物形态和力学性能的影响

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This article was concerned with the morphology and mechanical properties of blends of poly(styrene-co-N-phenylmaleimide) (SMI) and poly( styrene-co-acrylonitrile) (SAN) as functions of the mixing ratio of the blends and the acrylonitrile content in SAN. Differential scanning calorimetry (DSC) and. field-emission scanning transmission electron microscopy (FE-STEM) were used for the morphology characterization, and tensile strength and K-I (stress intensity factor in mode I), for the mechanical property comparison. The miscibility of the polymers was clearly distinguished using the number of glass transitions shown in the DSC thermograms. FE-STEM supports the DSC results, assisting in understanding the blend morphology for the immiscible blends in terms of the shape and size of the dispersed phase. The mechanical properties suggest that the miscible blends are superior to the immiscible counterparts and illustrate how the acrylonitrile content in SAN and the molecular weights of SMI and SAN affect the toughness of the miscible blends. We conclude from the study that the miscibility between SMI and SAN is an important factor for toughness enhancement of the blends. As a miscible blend, the mechanical properties improve with increase of the acrylonitrile content in SAN and the molecular weight of SMI and SAN. (C) 1998 John Wiley & Sons, Inc. [References: 10]
机译:本文关注的是聚(苯乙烯-共-N-苯基马来酰亚胺)(SMI)和聚(苯乙烯-共-丙烯腈)(SAN)的共混物的形态和力学性能,取决于共混物和丙烯腈的混合比SAN中的内容。差示扫描量热法(DSC)和。场发射扫描透射电子显微镜(FE-STEM)用于形貌表征,拉伸强度和K-I(模式I下的应力强度因子)用于机械性能比较。聚合物的混溶性通过DSC热谱图中显示的玻璃化转变数清楚地区分。 FE-STEM支持DSC结果,有助于从分散相的形状和尺寸方面了解不混溶共混物的共混物形态。机械性能表明,可混溶共混物优于不可混溶的共混物,并说明了SAN中的丙烯腈含量以及SMI和SAN的分子量如何影响可混溶共混物的韧性。从研究中我们得出结论,SMI和SAN之间的可混溶性是增强混合物韧性的重要因素。作为可混溶的共混物,机械性能会随着SAN中丙烯腈含量的增加以及SMI和SAN分子量的提高而提高。 (C)1998 John Wiley&Sons,Inc. [参考:10]

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