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首页> 外文期刊>Journal of Applied Polymer Science >Effect of a Dodecylsulfate-Modified Magnesium-Aluminum Layered Double Hydroxide on the Morphology and Fracture of Polystyrene and Poly(styrene-co-acrylonitrile) Composites
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Effect of a Dodecylsulfate-Modified Magnesium-Aluminum Layered Double Hydroxide on the Morphology and Fracture of Polystyrene and Poly(styrene-co-acrylonitrile) Composites

机译：十二烷基硫酸盐修饰的镁铝层状双氢氧化物对聚苯乙烯和聚（苯乙烯-丙烯腈）复合材料的形貌和断裂的影响

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Composites of polystyrene (PS) and poly (styrene-co-acrylonitrile) (SAN) containing a fraction of a dodecylsulfate-modified Mg-Al layered double hydroxide (LDH) were prepared by means of a melt-extrusion process. The structure and morhology were analyzed with wide-angle X-ray scattering and transmission electron microscopy, respectively. The X-ray spectra of the PS matrix composite displayed the diffraction peak characteristic of the hybrid LDH basal plane at 20 = 3.1 deg. The SAN matrix composite did not exhibit such a diffraction peak. Both PS and SAN composites displayed an intercalated type of morphology with respect to the LDH platelets, as assessed by transmission electron microscopy. A plasticizing effect due to the hybrid LDH particles was observed for all composites and was supported by a decrease in the glass-transition temperature values and by Fourier transform infrared spectra. Besides tensile properties, the fracture toughness of the composites was compared with that of the pure polymers through the linear elastic fracture mechanics parameters. They were determined from fracture tests under a three-point-bending configuration. The results indicated that the effect of adding a small fraction of modified LDH particles to SAN caused an improvement in fracture toughness of 50% with respect to that of the pure polymer. Moreover, the relative increase in the fracture energy was about 200%. For PS matrix composites, both tensile properties and linear elastic fracture mechanics fracture parameters remained unaffected. These results were explained on the basis of the different plasticities developed by both polymers around the particles. (c) 2008 Wiley Periodicals, Inc. J Appl Polym Sci 111: 2574-2583, 2009
机译：通过熔融挤出法制备包含一部分经十二烷基硫酸酯改性的Mg-Al层状双氢氧化物（LDH）的聚苯乙烯（PS）和聚（苯乙烯-丙烯腈）（SAN）的复合物。分别用广角X射线散射和透射电子显微镜分析其结构和形态。 PS基质复合材料的X射线光谱显示杂化LDH基面在20 = 3.1度时的衍射峰特征。 SAN基质复合材料没有表现出这样的衍射峰。如通过透射电子显微镜所评估的，相对于LDH血小板，PS和SAN复合材料均表现出插层的形态。在所有复合材料中均观察到了由于杂化LDH颗粒引起的增塑效果，并通过降低玻璃化转变温度值和傅立叶变换红外光谱得到了证实。除了拉伸性能外，还通过线性弹性断裂力学参数将复合材料的断裂韧性与纯聚合物的断裂韧性进行了比较。它们是根据三点弯曲配置下的断裂测试确定的。结果表明，相对于纯聚合物，将少量改性LDH颗粒添加到SAN的效果使断裂韧性提高了50％。而且，断裂能的相对增加约为200％。对于PS基复合材料，拉伸性能和线性弹性断裂力学断裂参数均保持不变。这些结果是根据两种聚合物围绕颗粒形成的不同可塑性进行了解释。 （c）2008 Wiley Periodicals，Inc. J Appl Polym Sci 111：2574-2583，2009

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