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用红外光谱仪和毛细管流变仪考察了不同微观结构,不同嵌段比、不同分子量的两嵌段1,4-1,2-聚丁二烯(1,4-1,2-PB)的结构与性能的关系。结果表明,PB的微观相分离主要取决于聚合物中1,2-PB嵌段的1,2-结构含量、1,2-PB/1,4-PB嵌段比及分子量。呈微观相分离的两嵌段1,4-1,2-PB在DSC-TDA图谱中出现两个玻璃化转变温度,其特性粘数随1,2-PB嵌段的增加出现重大值,且具有较低的冷流性,较好的加工性及较高的屈服强度。
The structures of diblock 1,4-1,2-polybutadiene (1,4-1,2-PB) with different microstructures, different block ratios and different molecular weights were investigated by infrared spectroscopy and capillary rheometer. Relationship with performance. The results show that the microscopic phase separation of PB mainly depends on the 1,2-structure content of 1,2-PB block, the 1,2-PB / 1,4-PB block ratio and the molecular weight of the polymer. The two-phase 1,4-1,2-PB, which appears microscopically separated, exhibits two glass transition temperatures in the DSC-TDA pattern, with an intrinsic viscosity showing significant values as the 1,2-PB block increases Has a lower cold flow, better workability and higher yield strength.