Samaržija-Jovanović Suzana, Jovanović Vojislav, Marković Gordana, Zeković Ivana, Marinović-Cincović Milena
Faculty of Natural Science and Mathematics, University of Priština, Lole Ribara 29, 38220 Kosovska Mitrovica, Serbia.
Tigar, Nikole Pašića 213, 18300 Pirot, Serbia.
ScientificWorldJournal. 2014 Feb 6;2014:913197. doi: 10.1155/2014/913197. eCollection 2014.
Opalized white tuff (OWT) with 40 μm average particle size and 39.3 m(2)/g specific surface area has been introduced into polyisoprene rubber (NR). Their reinforcing effects were evaluated by comparisons with those from precipitated silica (PSi). The cure characteristic, apparent activation energy of cross-link (E(ac)) and reversion (E(ar)), and mechanical properties of a variety of composites based on these rubbers were studied. This was done using vulcanization techniques, mechanical testing, and scanning electron microscopy (SEM). The results showed that OWT can greatly improve the vulcanizing process by shortening the time of optimum cure (t(c90)) and the scorch time (t(s2)) of cross-linked rubber composites, which improves production efficiency and operational security. The rubber composites filled with 50 phr of OWT were found to have good mechanical and elastomeric properties. The tensile strengths of the NR/OWT composites are close to those of NR/PSi composites, but the tear strength and modulus are not as good as the corresponding properties of those containing precipitated silica. Morphology results revealed that the OWT is poorly dispersed in the rubber matrix. According to that, the lower interactions between OWT and polyisoprene rubber macromolecules are obtained, but similar mechanical properties of NR/OWT (100/50) rubber composites compared with NR/PSi (100/50) rubber composites are resulted.
平均粒径为40μm、比表面积为39.3 m²/g的蛋白石化白凝灰岩（OWT）已被引入聚异戊二烯橡胶（NR）中。通过与沉淀二氧化硅（PSi）的增强效果进行比较，评估了它们的增强作用。研究了基于这些橡胶的各种复合材料的硫化特性、交联（E(ac)）和返原（E(ar)）的表观活化能以及力学性能。这是通过硫化技术、力学测试和扫描电子显微镜（SEM）来完成的。结果表明，OWT可以通过缩短交联橡胶复合材料的最佳硫化时间（t(c90)）和焦烧时间（t(s2)）来极大地改善硫化过程，从而提高生产效率和操作安全性。发现填充50 phr OWT的橡胶复合材料具有良好的力学和弹性性能。NR/OWT复合材料的拉伸强度接近NR/PSi复合材料的拉伸强度，但撕裂强度和模量不如含沉淀二氧化硅复合材料的相应性能。形态学结果表明，OWT在橡胶基体中分散性较差。据此，OWT与聚异戊二烯橡胶大分子之间的相互作用较低，但NR/OWT（100/50）橡胶复合材料与NR/PSi（100/50）橡胶复合材料具有相似的力学性能。
