Synthesis Of Integration Rubber SIBR And Study On Reinforcement Of Silica

In this dissertation, terpolymers of styrene, isoprene and butadiene (SIB) were synthesized using novel asymmetrical ether-ethyl glycol ter-butyl ether BET as a structure modifier, and study the polymerization kinetics and factors affecting microstructure structure of SIB, and factors affecting the vulcanization characteristic, mechanical properties and dynamic properties of SIBR were investigated such as the coupling types, Si69 contents, silica types, silica contents and water dosage of silica.The research results indicated that the reaction rate increased and appearance reaction active energy and frequency factor of both total polymerization and various monomers decreased with the increasing of reaction temperature and molar ratio of BET/n-BuLi. The styrene monomers of SIB were random by increasing reaction temperature or improving the dosage of asymmetrical ether BET.The 1.2-PB and 3.4-PI structure decreased gradually and 1.4-PB and 1.4-PI increased gradually with the increasing of reaction temperature. Also the 1.2-PB and 3.4-PI structure decreased gradually and 1.4-PB and 1.4-PI increased gradually with the dosage increasing of asymmetrical ether BET. Styrene monomers of terpolymer were random when the molar ratio of BET/n-BuLi was over 7. The microstructure of SIBR was affected strongly by the content of various monomers and was almost not affected by other factors.Physicomechanical properties of SIBR were almost not affected by the polymerization temperature, and were affected strongly by other factors as follows. Tensile strength of SIBR increased gradually with the dosage increasing of asymmetrical ether BET. The integral physicomechanical properties of SIBR was best when monomers mass ratio of styrene, isoprene and butadiene was 20/40/40.The values of gum's Mooney viscosity, shore hardness, modulus at 300% and tensile strength increased and the elongation at break decreased with the molecular weight increasing of SIBR. The values of tensile strength, modulus at 300% increased gradually and the coupling arms, elongation at break and permanent strain all decreased gradually with the increasing of coupling efficiency of SIBRDifferent coupling agents (Si69 A-171 NDZ-201 and Si69/BC) were added to SIBR to improve their integral properties. The vulcanization properties of SIBR containing A-171 were the best, and the second was that of SIBR containing Si69. But SIBR containing Si69 has the best integral properties including physicomechanical and dynamic properties, especially when Si69 dosage is 10% (weight based on silicas). For reinforcement systemcontaining different type silicas (Z165^T299-1 > A-150 and A-380), the integral properties of SIBR containing Z165 was the best, and the worst of SIBR containing A-380. The order of corresponding rolling resistance of SIBR containing different type silicas was as follows: A-380 > A-150 >HT299-1 >Z165. For Z165/ Si69 reinforcement system, scorch time, vulcanization time and the values of Mooney viscosity, tensile strength of SIBR mixed stock increased gradually with the dosage of silicas increasing. However, tear strength, modulus at 300% of SIBR increased and reached the max value, then decreased with the dosage of silicas increasing. Oppositely, the elongation at break and permanent strain decreased and reached the min. value, then increased with the dosage of silicas increasing. The lowest rolling resistance could be attained when the mass ratio of Z165/CB was 15/30, especially when Z165 contained 6% water. For SIBR with different structure, the integral properties of block SIBR was better than that of random SIBR, but the dynamic properties was not as good as that of random SIBR.