Abstract:
The slurry polymerization of styrene with pentamethylcyclopentadienyltitanium trichloride in combination with boron compound and triisobutylaluminum was investigated to study the effect of polymerization time on property of syndiotactic polystyrene. From the experimental results, it was found that the % syndiotactic index (% S.I.) of polystyrene obtained with various polymerization times had the slight difference in every polymerization time. Also, they did not appear to be related to the polymerization time. Furthermore, study the effect of additive addition on crystallinity of blended polymer. Stirring melt mix was utilized in blending of syndiotactic polystyrene and additive with content at 1.0% by weight of cyclohexylbiphenylcyclohexane (CBC-33), which it was low molar mass liquid crystal or glycerol monostearate (GMS), which it was commercial lubricant. The glass transition temperature (Tg), crystalline temperature (Tc), melting temperature (Tm),% Crystallinity, morphology and light scattering of the resulting blends were investigated and compared with the base polymer. The results showed that the major effect of liquid crystal and lubricant were to increase the molecular mobility of the blends. Therefore the additive addition to base polymer by affect the increasing of % crystallinity and light scattering whereas would reducing of Tc and Tm in blended polymer.
