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Insight into Vulcanization Mechanism of Novel Binary Accelerators for Natural Rubber 被引量:2
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作者 Shu-yan Yang 贾志欣 +3 位作者 Lan Liu Wei-wen Fu De-min Ji Yuan-fang Luo 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2014年第8期1077-1085,共9页
A novel TU derivative, N-phenyl-N'-(γ-triethoxysilane)-propyl thiourea (STU), is prepared and its binary accelerator system is investigated in detail. Compared to the control references, the optimum curing time ... A novel TU derivative, N-phenyl-N'-(γ-triethoxysilane)-propyl thiourea (STU), is prepared and its binary accelerator system is investigated in detail. Compared to the control references, the optimum curing time of NR compounds with STU is the shortest, indicating a more nucleophilic reaction occurs. The Py-GC/MS results present that the phenyl iso- thiocyanate fragment still remains in the NPUSTU compounds with or without extracting treatment, but no silane segment can be found in the vulcanizate with extracting treatment. Vibrations of C=S, NH and aromatic ring in FTIR experiments and a new methyne carbon peak, as well as the peaks of phenyl group of STU, in the solid state 13C-NMR experiments are found in the NR/STU vulcanizate with extracting treatment. Moreover, the crosslinking density of vulcanizates with STU evolves to lower level, indicating the sulfur atom of STU does not contribute to the sulfur crosslinking. Therefore, a new vulcanization kinetic mechanism of STU is propounded that the thiourea groups can graft to the rubber main chains as pendant groups by chemical bonds during the vulcanization process, which is in accordance with the experimental observations quite well. 展开更多
关键词 vulcanization mechanism THIOUREA Natural rubber Binary accelerators.
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