摘要
用脉冲回波法测定了甲基丙烯酸酯类共聚物的超声衰减与声速。在2.5和5MHz 两种频率下,考察了共聚物超声衰减的温度关系。所得结果与 DSC 法作了比较,共聚物的玻璃化转变温度 T_g 相近。
Effect of structure and composition on ultrasonic attenuationand velocity of polymer has been studied by pulse-echo method.Temperaturedependence of ultrasonic attenuation on different polymer materials was mea-sured,the range of measuring temperature was 20—120℃.2.5 and 5MHz wereused as measuring frequency.The results given by this method have been com-pared with that of DSC method.The glass transition temperature of polymersmeasured by the above two method was in agreement with each other.
基金
国家自然科学基金
285331
关键词
甲基丙烯酸酯
超声
衰减
声速
ultrasonic attenuation
velocity
polymeric ultrasonics
