In this study, high impact polystyrene (HIPS) materials was prepared by using a styrenic elastomer (10, 20, 30 wt%) and carbon nanotube (CNT) (3, 5, 7, 10 phr) by melt blending technique as alternative to commercial HIPS including polybutadiene rubber. The poly (styrene- b-isobutylene- b-styrene) (SIBS) was used as thermoplastic elastomer with polystyrene (PS) to improve its poor impact resistance and CNT was added to PS/SIBS blend matrix to maintain its strength and stiffness. The modulus, tensile strength and toughness values of the blends decreased while those of impact resistance increased in comparison to neat PS. The impact strength of PS20SIBS blend containing 20 wt% SIBS was found to be approximately 530% higher than pure PS. The nanocomposites of the PS20SIBS exhibited a decrease in the size of SIBS particles with increasing CNT compared to PS20SIBS. This was ascribed to the increased viscosity of PS matrix via CNT filler, preventing the coalescence of the elastomer domains. Compared to the PS20SIS, its nanocomposites showed higher strength, modulus and toughness, but lower impact strength. The toughness of the nanocomposite containing 5 phr CNT (PS20SIBS-5CNT), increased by 117% while its creep deformation decreased by approximately 40%, in comparison with PS20SIBS blend. Although PS20SIBS-5CNT exhibited lower impact strength than the PS20SIBS blend due to the dispersion of smaller SIBS particles in the PS matrix, it still increased the impact strength of pure PS by 188%. The PS20SIBS-5CNT nanocomposite, which improved impact strength and creep resistance with optimal toughness and tensile modulus can be used as a novel HIPS material that tunes the hardness-toughness/impact balance effectively. Moreover, the same nanocomposite was found to reach the conductivity threshold by exhibiting 106 times lower electrical resistance in comparison with that containing 3 phr CNT, leading to a conductive filer network with 5 phr loading of the nanotubes into the system.

中文翻译：

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聚苯乙烯/聚苯乙烯-b-异丁烯-b-苯乙烯/碳纳米管纳米复合材料的热、机械、电性能

在本研究中，使用苯乙烯弹性体（10、20、30 wt%）和碳纳米管（CNT）（3、5、7、10 phr）通过熔融共混技术制备高抗冲聚苯乙烯（HIPS）材料，作为替代材料商用 HIPS 包括聚丁二烯橡胶。将聚(苯乙烯-b-异丁烯-b-苯乙烯)(SIBS)与聚苯乙烯(PS)一起用作热塑性弹性体以改善其较差的抗冲击性，并将CNT添加到PS/SIBS共混基质中以保持其强度和刚度。与纯 PS 相比，共混物的模量、拉伸强度和韧性值有所下降，而抗冲击性则有所提高。发现含有 20 wt% SIBS 的 PS20SIBS 共混物的冲击强度比纯 PS 高约 530%。与 PS20SIBS 相比，PS20SIBS 纳米复合材料的 SIBS 颗粒尺寸随着 CNT 的增加而减小。这是由于 CNT 填料增加了 PS 基质的粘度，从而防止了弹性体域的聚结。与PS20SIS相比，其纳米复合材料表现出更高的强度、模量和韧性，但冲击强度较低。与PS20SIBS共混物相比，含有5份CNT的纳米复合材料（PS20SIBS-5CNT）的韧性增加了117％，而蠕变变形减少了约40％。尽管由于较小的 SIBS 颗粒分散在 PS 基体中，PS20SIBS-5CNT 的冲击强度比 PS20SIBS 共混物低，但它仍然使纯 PS 的冲击强度提高了 188%。PS20SIBS-5CNT纳米复合材料提高了冲击强度和抗蠕变性，并具有最佳的韧性和拉伸模量，可用作有效调节硬度-韧性/冲击平衡的新型HIPS材料。此外，发现相同的纳米复合材料表现出 10 达到电导率阈值6与含有 3 份 CNT 的电阻相比，电阻低 1 倍，从而形成一个将 5 份纳米管加载到系统中的导电过滤网络。