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首页> 外文期刊>Materials & design >Effect of expanded graphite and modified graphite flakes on the physical and thermo-mechanical properties of styrene butadiene rubber/polybutadiene rubber (SBR/BR) blends
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Effect of expanded graphite and modified graphite flakes on the physical and thermo-mechanical properties of styrene butadiene rubber/polybutadiene rubber (SBR/BR) blends

机译：膨胀石墨和改性石墨薄片对丁苯橡胶/聚丁二烯橡胶（SBR / BR）共混物的物理和热机械性能的影响

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摘要

The aim of the present research work is to develop expanded graphite (EG) and isocyanate modified graphite nanoplatelets (i-MG) filled SBR/BR blends, which can substitute natural rubber (NR) in some application areas. The present study investigated the effect of i-MG on the physical, mechanical and thermo-mechanical properties of polybutadiene rubber (BR), styrene butadiene rubber (SBR) and SBR/ BR blends in the presence of carbon black (CB). Graphite sheets were modified to enhance its dispersion in the rubber matrices, which resulting in an improvement in the overall physical and mechanical properties of the rubber vulcanizates. Compounds based on 50:50 of BR and SBR with ～3 wt% nanofillers with CB were fabricated by melt mixing. The morphology of the filled rubber blends was investigated by wide angle X-ray diffraction (WAXD) and high resolution transmission electron microscopic (HR-TEM) analyses. The intercalated and delaminated structures of the nanofiller loaded rubber blends were observed. Scanning electron microscopic (SEM) analysis of the cryo-fractured surfaces of the rubber compounds showed more rough and tortuous pathway of the fractured surfaces compared to the fractured surfaces of the only CB loaded rubber composites. Filled rubber compounds exhibit increase in the AS (torque difference) value, reduced scorch and cure time compared to their respective controls. Dynamic mechanical thermal analysis (DMTA) of the filled rubber compounds shows an increase in the storage modulus compared to the controls. Isocyanate modified graphite nanoplatelets (i-MG) containing rubber compounds in the presence of CB showed an increase in the mechanical, dynamic mechanical, hardness, abrasion resistance and thermal properties compared to the alone CB filled rubber vulcanizates.
机译：本研究工作的目的是开发膨胀石墨（EG）和异氰酸酯改性的石墨纳米片（i-MG）填充的SBR / BR共混物，它们可以在某些应用领域替代天然橡胶（NR）。本研究研究了i-MG对在炭黑（CB）存在下聚丁二烯橡胶（BR），丁苯橡胶（SBR）和SBR / BR共混物的物理，机械和热机械性能的影响。石墨片经过改性以增强其在橡胶基质中的分散性，从而改善了橡胶硫化橡胶的整体物理和机械性能。通过熔融混合制备了基于BR和SBR为50:50的化合物，含〜3 wt％的含CB的纳米填料。通过广角X射线衍射（WAXD）和高分辨率透射电子显微镜（HR-TEM）分析研究了填充的橡胶共混物的形态。观察到负载有纳米填料的橡胶混合物的插层和分层结构。橡胶混合物的低温断裂表面的扫描电子显微镜（SEM）分析显示，与仅含CB的橡胶复合材料的断裂表面相比，断裂表面的弯曲路径更为粗糙和曲折。与各自的对照组相比，填充的橡胶混合物显示出AS（扭矩差）值增加，焦化和固化时间减少。与对照组相比，填充橡胶混合物的动态机械热分析（DMTA）显示出储能模量的增加。与单独的填充有CB的橡胶硫化橡胶相比，在CB存在下含橡胶化合物的异氰酸酯改性的石墨纳米片（i-MG）显示出机械，动态机械，硬度，耐磨性和热性能的提高。

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