Zedler Łukasz, Colom Xavier, Cañavate Javier, Formela Krzysztof
Department of Polymer Technology, Faculty of Chemistry, Gdańsk University of Technology, Gabriela Narutowicza 11/12, 80-233 Gdańsk, Poland.
Department of Chemical Engineering, Universitat Politècnica de Catalunya Barcelona Tech, Colom 1, Terrassa, 08222 Barcelona, Spain.
Materials (Basel). 2021 Sep 16;14(18):5345. doi: 10.3390/ma14185345.
In this work, conventional sulfur and two types of organic peroxides (dicumyl peroxide (DCP) and di-(2-tert-butyl-peroxyisopropyl)-benzene (BIB)) curing systems were used to investigate the possibility for tailoring of the performance properties of GTR/NBR blends reinforced with a variable content of highly dispersive silica (0-30 phr). The curing characteristics, static mechanical and acoustical properties, swelling behavior, thermal stability, and microstructure of the prepared composites were investigated. The results show that regardless of the curing system used, increasing the content of highly dispersive silica resulted in the improvement of the mechanical properties of the studied materials. It was observed that sulfur-based systems are the best choice in terms of cross-linking efficiency determined based on torque increment and cross-link density parameters. However, further analysis of the physico-mechanical properties indicated that the cross-linking efficiency does not match the performance of specimens, and the materials obtained using organic peroxides show higher tensile properties. This is due to the improved physical interactions between the GTR/NBR matrix and highly dispersive silica when using peroxide systems. It was confirmed using the analysis of the Wolff activity coefficient, indicating the enhanced synergy.
在本研究中，采用传统硫磺以及两种有机过氧化物（过氧化二异丙苯（DCP）和二（2-叔丁基过氧异丙基）苯（BIB））固化体系，研究了用不同含量（0 - 30 phr）的高分散性二氧化硅增强的GTR/NBR共混物性能定制的可能性。研究了制备的复合材料的固化特性、静态力学和声学性能、溶胀行为、热稳定性及微观结构。结果表明，无论使用何种固化体系，增加高分散性二氧化硅的含量都会使所研究材料的力学性能得到改善。观察到，基于扭矩增量和交联密度参数确定的交联效率方面，硫磺基体系是最佳选择。然而，对物理力学性能的进一步分析表明，交联效率与试样性能不匹配，使用有机过氧化物获得的材料具有更高的拉伸性能。这是由于使用过氧化物体系时，GTR/NBR基体与高分散性二氧化硅之间的物理相互作用得到改善。通过对沃尔夫活度系数的分析证实了这一点，表明协同作用增强。
