Compatibilized thermoplastic vulcanizates (TPVs) based on polypropylene (PP) and polybutadiene rubber (PBR) were developed through the melt-mixing method, and their morphological, rheological, and dynamic mechanical properties were investigated. The composition of PBR/PP blends (30/70 and 40/60) was designed in a way to study the interrelationship between the compatibilizer content and blend composition. In this study, a hydrocarbon resin (MS 40) was employed as the compatibilizer. Based on morphological analysis, the addition of compatibilizer in both blend compositions led to a finer and more uniform distribution of rubber domains; however, only for 40/60 composition, the higher content of compatibilizer caused the formation of a co-continuous morphology. Both dynamic and static rheology results were highly susceptible to the compatibilizer content and blend composition. According to the storage and loss modulus curves, the incorporation of PBR into PP resulted in a significantly enhanced elastic response with 30/70 composition showing lower elasticity. The viscosity upturn in complex viscosity curves indicated the formation of a three-dimensional network of dispersed rubber domains within the matrix, which led to the appearance of a highly elastic response. Based on the dynamic mechanical analysis, the highly restricted macromolecular motions upon the addition of a compatibilizer confirmed the enhanced compatibility of TPVs.

中文翻译：

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增容剂对聚丙烯/聚丁二烯热塑性硫化橡胶微观结构和粘弹性的影响

采用熔融混炼法开发了基于聚丙烯（PP）和聚丁二烯橡胶（PBR）的增容热塑性硫化橡胶（TPV），并对其形态、流变和动态力学性能进行了研究。PBR/PP 共混物（30/70 和 40/60）的组成旨在研究增容剂含量和共混物组成之间的相互关系。在这项研究中，烃类树脂 (MS 40) 被用作增容剂。基于形态分析，在两种共混组合物中添加相容剂导致橡胶域的分布更精细和更均匀；然而，仅对于 40/60 组合物，较高含量的相容剂导致形成共连续形态。动态和静态流变结果都对增容剂含量和共混物组成高度敏感。根据储能和损耗模量曲线，将 PBR 掺入 PP 导致弹性响应显着增强，30/70 组合物显示出较低的弹性。复数粘度曲线的粘度上升表明在基体中形成了分散的橡胶域的三维网络，这导致了高弹性响应的出现。基于动态力学分析，添加增容剂后高度受限的大分子运动证实了 TPV 增强的相容性。将 PBR 掺入 PP 导致弹性响应显着增强，30/70 组合物表现出较低的弹性。复数粘度曲线的粘度上升表明在基体中形成了分散的橡胶域的三维网络，这导致了高弹性响应的出现。基于动态力学分析，添加增容剂后高度受限的大分子运动证实了 TPV 增强的相容性。将 PBR 掺入 PP 导致弹性响应显着增强，30/70 组合物表现出较低的弹性。复数粘度曲线的粘度上升表明在基体内形成了分散的橡胶域的三维网络，这导致了高弹性响应的出现。基于动态力学分析，添加增容剂后高度受限的大分子运动证实了 TPV 增强的相容性。