Abstract

Blends of polynorbornene rubber and natural rubber with varying compositions were made and their swelling behavior in kerosene at 35, 45 and 55 °C were examined by conventional weight-gain method. Transport parameters such as diffusion, permeation and sorption coefficients were estimated for each blend systems, and the data obtained were utilized in the determination of activation energies of diffusion (E_D) & permeation (E_P) and enthalpy of sorption (ΔH_s). Moreover, the kinetics of sorption was also studies and it was found that the transport behavior of blends systems changed from anomalous to Fickian to quasi Fickian diffusion for the penetrating molecules. PB-03 at 35 °C showed perfect Fickian diffusion behavior. Besides this, theoretical modeling of diffusion was carried out which revealed that the experimental data were best satisfied with Peppas-Sahlin model. SEM analysis was also carried out to identify the morphology of the blends. Furthermore, mechanical testing was also performed for unswollen, swollen and deswollen blends samples to evaluate the stability of rubber blends.

Graphic abstract

中文翻译：

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煤油通过聚降冰片烯橡胶/天然橡胶共混物的传输机制和扩散动力学

摘要

制备了具有不同成分的聚降冰片烯橡胶和天然橡胶的共混物，并通过传统的增重方法检查了它们在 35、45 和 55 °C 下在煤油中的溶胀行为。估计每个混合系统的传输参数，例如扩散、渗透和吸附系数，并将获得的数据用于确定扩散激活能 ( E _D ) 和渗透 ( E _P ) 和吸附焓 (Δ H _s）。此外，对吸附动力学也进行了研究，发现共混体系的传输行为从反常扩散到菲克扩散，再到渗透分子的准菲克扩散。PB-03 在 35 °C 下表现出完美的 Fickian 扩散行为。除此之外，还进行了扩散的理论建模，结果表明实验数据最符合 Peppas-Sahlin 模型。还进行了SEM分析以鉴定共混物的形态。此外，还对未溶胀、溶胀和去溶胀共混物样品进行了机械测试，以评估橡胶共混物的稳定性。

图形摘要