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聚合物在压强作用下会发生一系列转变或结构松弛,它们强烈地影响聚合物的性能。转变压强如同转变温度一样,是表征聚合物本体结构和分子运动的重要参数。因此,近年来对聚合物压致转变的研究受到了广泛的重视。如Sasuga和Tokehisa用膨胀计在0—8KPa内研究了聚异戊二烯的玻璃化转变。Dalal用介电松弛在0—3.8Kbar研究了聚异戊二烯的玻璃化转变与压强的关系等等。本工作则首次利用激光拉曼光谱研究了聚异戊二烯在0—2GPa压强范围内的20℃等温压致转变,并利用活塞圆筒装置进行了等温压缩实验。
Polymers undergo a series of transformations or structural relaxation under pressure that strongly affect the properties of the polymer. Transforming pressure, like the transition temperature, is an important parameter characterizing the structure of polymers and their molecular motions. Therefore, in recent years, the research on the pressure-induced transformation of polymers has received extensive attention. For example, Sasuga and Tokehisa studied the glass transition of polyisoprene with a dilatometer at 0-8 kPa. Dalal uses dielectric relaxation at 0-3.8Kbar to study the relationship between glass transition and pressure of polyisoprene. In this work, the isothermal compressive transformation of polyisoprene at 20 ℃ in the pressure range of 0-2GPa was studied for the first time by laser Raman spectroscopy, and isothermal compression experiments were carried out by using a piston cylinder device.