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
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