Study on the curing properties of SBR/La-GDTC/SiO_2 composites

• Published in: Journal of rare earths Vol. 29; no. 5; pp. 444 - 453
• Main Author: 杨树颜 刘岚 贾志欣 贾德民 罗远芳
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 2011
• Subjects: composites; curing kinetic; rare earth accelerator; rubber; SBR; silica; SiO2; 二氧化; 二硫代氨基甲酸; 合材料; 固化速度; 硫硫化; 谷氨酸; composites; curing kinetic; silica; rubber; rare earth accelerator
• ISSN: 1002-0721; 2509-4963
• DOI: 10.1016/S1002-0721(10)60477-2

A lanthanum glutamic dithiocarbamate（La-GDTC） was synthesized. The vulcanization kinetic and crosslinking structure of styrene butadiene rubber （SBR）/La-GDTC/silica（SiO2） composites were studied via vulcanization kinetic simulation,swelling equilibrium and differential scanning calorimeter. Simulated curing parameters showed that the curing rate k2 of the SBR/La-GDTC/SiO2 composite was significantly higher than that of the SBR/La-GDTC composite. Also,swelling equilibrium test turned out that crosslinking density of SBR/LaGDTC/SiO2 composite evolved to higher level,compared to that of the SBR/La-GDTC composite. Ammonia modified swelling equilibrium interpreted both lanthanum ions and carboxyl groups could react with silanol groups of silica particles. Finally,vulcanization activation energies of SBR/La-GDTC/SiO2 composite were lower than that of SBR/La-GDTC composite,without respect to different approaches of the DSC measurement or Oscillated Disc Rheometer test. All the results showed that the lanthanum ions of La-GDTC could act as the metal ion catalyzer of sulfur vulcanization during the crosslinking process,which could be attributed to the unoccupied orbital of lanthanum ions. Therefore,a La-GDTC bridged structure between SBR and silica particles for the SBR/La-GDTC/SiO2 composite was suggested according to the experimental results.