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首页> 外文期刊>Journal of Applied Polymer Science >Influence of Oil Contents in Dynamically Cured Natural Rubber and Polypropylene Blends
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Influence of Oil Contents in Dynamically Cured Natural Rubber and Polypropylene Blends

机译：动态固化天然橡胶和聚丙烯混合物中油含量的影响

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摘要

Mechanical, dynamic, thermal, and morphological properties of dynamically cured 60/40 NR/PP TPVs with various loading levels of paraffinic oil were investigated. It was found that stiffness, hardness, tensile strength, storage shear modulus, complex viscosity, glass transition temperature (T-g) of the vulcanized rubber phase, degree of crystallinity and crystalline melting temperature (T-m) of the polypropylene (PP) phase decreased with increasing loading levels of oil. This is attributed to distribution of oil into the PP and vulcanized rubber domains causing oil-swollen amorphous phase and vulcanized rubber domains. An increasing trend of elastic response in terms of tension set and damping factor was observed in the TPVs with loading levels of oil in a range of 0-20 phr. It is supposed that a major proportion of oil was first preferably migrated into the PP phase and caused an abrupt decreasing trend of degree of crystallinity and T-m of the PP phase. The dispersed vulcanized rubber domains remained small as particles with a low degree of swelling. Increasing loading levels of oil higher than 20 phr caused a decreasing trend of elongation at break and elastomeric properties. Saturation of oil in the PP phase was expected and the excess oil was transferred to the rubber phase which thereafter caused larger swollen vulcanized rubber domains. The remaining amount of oil was able to separate as sub-micron pools distributed in the PP matrix. This caused lowering of T-g, T-m, crystallinity of PP phase as well as strength, elastomeric, and dynamic properties of the TPVs.
机译：研究了不同载量石蜡油动态固化的60/40 NR / PP TPV的机械，动态，热学和形态学性质。结果发现，硫化橡胶相的刚度，硬度，拉伸强度，储能剪切模量，复数粘度，玻璃化转变温度（Tg），聚丙烯（PP）相的结晶度和结晶熔融温度（Tm）随温度的升高而降低。油的装载量。这归因于油在PP和硫化橡胶区域中的分布，导致油溶胀的非晶相和硫化橡胶区域。在TPV中，在油的负载水平为0-20 phr的范围内，观察到了弹性响应在拉伸变形和阻尼系数方面的增长趋势。据推测，首先优选将大部分的油迁移到PP相中，并引起PP相的结晶度和T-m的急剧下降的趋势。分散的硫化橡胶区域作为具有低溶胀度的颗粒保持很小。高于20 phr的油的装载量增加会导致断裂伸长率和弹性体性能下降。预计PP相中的油会饱和，多余的油会转移到橡胶相中，此后会引起较大的硫化橡胶区域溶胀。剩余的油量能够作为分布在PP基质中的亚微米级池分离出来。这导致T-g，T-m，PP相的结晶度以及TPV的强度，弹性和动态性能降低。

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