The Research Of Dual Curing System And Molecular Dynamics Simulation Of The Large-Scale Rubber System

There are two vulcanization systems for natural rubber. For sulfur curing system, the vulcanized rubber has stronger tear strength and excellent stretching fatigue resistance, because of molecular chain slipping of polysulfur bonds; while for peroxide vulcanization system, the property of thermal aging resistance of vulcanized rubber is better, because the bond energy of carbon-carbon bond is higher.Therefore, a new vulcanization system which has both of the two advantages above is essential. This paper will take the natural rubber (NR) as matrix, with zinc methacrylate (ZDMA) as co-crosslink agent. Then analyze this vulcanization system by measuring the vulcanization curve, crosslinking density, rubber processing analyzer, mechanical properties of vulcanized rubber before aging and after thermal aging (100?,72h,168h, 336h) and mechanical properties after fatigue (one hundred thousand times).Also, we build a united atom model, and simulate the rubber chain with a large number of chain repeating units through molecular dynamics simulation.Conclusion:For the NR, we can get both of the two advantages by using sulfur and ZDMA as crosslinking agent. When we add sulfur of 1.5phr and ZDMA of 2phr, the properties of the vulcanized rubber reach the best.