Citation: Shu-yan Yang, Zhi-xin Jia, Lan Liu, Wei-wen Fu, De-min Jia, Yuan-fang Luo. Insight into Vulcanization Mechanism of Novel Binary Accelerators for Natural Rubber[J]. Chinese Journal of Polymer Science, ;2014, 32(8): 1077-1085. doi: 10.1007/s10118-014-1486-x shu

Insight into Vulcanization Mechanism of Novel Binary Accelerators for Natural Rubber

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Chemical Industrial Cleaner Production and Green Chemical R&
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College of Materials Science and Engineering, South China University of Technology, Guangzhou 510641, China

Received Date: 5 December 2013
Revised Date: 27 February 2014

Fund Project: This work was financially supported by the National Natural Science Foundation of China (Nos. 51003031 and 51303026) and Science Foundation for Universities and Institutions of Dongguan City (No. 2012108102008) and the Research Fund for the Doctoral Program of Dongguan University of Technology (No. ZJ121002).

A novel TU derivative, N-phenyl-N-(g-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 NR/STU 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.
- Vulcanization mechanism,
- Thiourea,
- Natural rubber,
- Binary accelerators
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沈阳化工大学材料科学与工程学院沈阳 110142