Citation: Guan Dong-bo, Cai Zhong-yi, Liu Xin-chun, Lou Bo, Dou Yan-li, Xu Dong-hua, Yao Wei-guo. Rheological Study on the Cure Kinetics of Two-component Addition Cured Silicone Rubber[J]. Chinese Journal of Polymer Science, ;2016, 34(10): 1290-1300. doi: 10.1007/s10118-016-1847-8 shu

Rheological Study on the Cure Kinetics of Two-component Addition Cured Silicone Rubber

Guan Dong-bo ^a ,
Cai Zhong-yi ^b ,
Liu Xin-chun ^a,c ,
Lou Bo ^d ,
Dou Yan-li ^a ,
Xu Dong-hua ^c,, ,
Yao Wei-guo ^a,,

a.
Key Laboratory of Automobile Materials, Ministry of Education, College of Materials Science and Engineering, Jilin University, Changchun 130025, China
b.
Jilin University Roll Forging Technology Research Institute, Changchun 130025, China
c.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
d.
Zhejiang Zhulishen Medical Co. LTD, Zhuji 311814, China

Corresponding author: Xu Dong-hua, dhxu@ciac.ac.cn Yao Wei-guo, wgyao@jlu.edu.cn
Received Date: 7 April 2016
Revised Date: 27 April 2016
Accepted Date: 8 May 2016

Fund Project: the National Natural Science Foundation of China 21274152the Science and Technology Development Project of Jilin Province, China 20150301002GX

The cure kinetics for two-component silicone rubber formed by addition reaction was studied by the rheological method. The influence of reaction temperature (T) on the cure kinetics was explored in detail. It was observed that the data of gel time (t_gel, i.e. the time when the reaction reaches the gel point) or a specific reaction time (t_nc) (defined as the reaction time before which time the influence of confinement of network on the diffusion of reaction components can be neglected) versus T obey certain functional relationship, which was well explained by the cure kinetics model of thermoset network. The cure kinetics for the two-component silicone rubber can be well fitted by the Kamal-Sourour(autocatalyst) reaction model rather than Kissinger model. When the reaction time was before or equal to t_nc, the reaction order obtained by the Kamal-Sourour reaction model was 2, which was consistent with the reaction order inferred from the two components chemical reaction when the diffusion of reaction components was not influenced by the formed cross-linked polymer network. When the reaction time was larger than t_nc, such as to the end of reaction (t_e), the influence of confinement of network on the diffusion of reaction components cannot be neglected, and the reaction order obtained by the Kamal-Sourour reaction model was larger than 2. It was concluded that the confinement effect of network had a greater influence on the cure kinetics of the silicone rubber. The reaction rate constants (k_r) under different temperatures were also determined by Kamal-Sourour reaction model. The activation energy (E) for the two-component silicone rubber was also calculated from the results of lnt_gel, lnt_nc, and lnk_r versus 1/T, respectively. The three values of E were close, which indicated that above analyses were self-consistent.
- Silicone Rubber,
- Cure kinetics,
- Rheology,
- Gel point,
- Reaction model
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