Thermal Properties And Mechanical Properties Of TPI,TPB,s-PB And Corresponding Blends

Trans-1,4-polyisoprene, trans-1,4-polybutadiene and syndiotactic-1,2-poly-butadiene are semi-crystalline polydienes. Due to the unique structure and properties,they can be used in many fields. It’s well known that polymer blending is anattractive alternative for producing newpolymeric materials with desirable properties.DSC and WAXD were used to characterize the structure of the blends. And thecrystallization kinetics of TPI/s-PB blends were investigated，the results show that,in the isothermal crystallization process, the crystallization mode of TPI componentmight be the mixture of one-dimensional, needle-like and two-dimensional, circular,and s-PB acted as heterogeneous nucleation in the TPI matrix. Meanwhile, thecrystallization rate of TPI increases with the increasing of s-PB. The curingproperties of TPI/s-PB blends during the transition form plastic to elastomer werestudied by sulfur vulcanizing system. It’s found that with the increasing of s-PB, thevulcanizing time of TPI/s-PB blends gradually reduced. And the mechanicalproperties of TPI/s-PB blends were been tested.The thermal property, crystallization and microstructure of the blends wereanalyzed by means of DSC, WAXD and SEM. The results of nonisothermalcrystallization kinetics for TPI/TPB blends show that, with the increasing of coolingrate, each peak moves to low temperature. The crystallization of TPI and hightemperature crystallization of TPB can both be divided into two stage, the primarycrystallization stage and the secondary crystallization stage. During the primarystage, the crystallization mode of TPI is mainly three-dimensional growth mechanismwith a combination of thermal and athermal nucleation. The crystallization mode ofTPI in high temperature is also a three-dimensional growth with homogeneous nucleation. Meanwhile, the crystallization mode of TPB in low temperature is acombination of three-dimensional and two-dimensional growth. In the secondarystage, the Avrami exponents indicate the crystallization mode of TPI and TPB in hightemperature are both a combination of one-dimensional, needle-like andtwo-dimensional, circular. TPI and TPB both have double bonds in their main chain,hence they can transfer form glass state to rubbery state by vulcanization. Theproperty of sulfur vulcanization and mechanical properties for TPI/TPB blends havebeen studied.The structure and property of the blends were characterized by means of DSC,WAXD and SEM. The vulcanization and mechanical properties for TPI/TPB/s-PBblends were analyzed. The results indicate, the blends with different rubber-plasticform can be obtained by controlling the curing time.