超声波声速与聚合物熔体密度的单值性

Single Valuedness of Ultrasonic Velocity and Polymer Melt Density

利用一定质量的聚合物熔体在密封容器内其压力-比容-温度(P-V-T)状态变量符合理想气体P-V-T状态方程的特点,通过自行设计加工的基于P-V-T原理的实验装置,得到了基于物理定义的聚合物熔体密度和熔体体积弹性模量的数学表达式,验证了聚合物熔体密度和熔体体积弹性模量在理论上存在的一致性变化的特性;在此基础上由聚合物熔体密度、熔体体积弹性模量和超声波传播声速三者之间相互关系,推导出超声波声速与聚合物熔体密度存在单值性的数学表达式,并通过实验验证了聚合物熔体密度与超声波声速存在一一对应性,为超声波技术应用于聚合物熔体密度的在线测量提供理论基础和实验数据。

A certain amount of polymer melt in a sealed container,the P-V-T state variables conform to P-V-Tstate equation of the ideal gas,thus by the experimental device based on P-V-T principle to design processing,the mathematical expression of experiments on polymer melts density and polymer bulk elastic modulus on the basis of physical definitions can be inferred.Property verification consistent changes exist in theory of polymer melt density and polymer bulk elastic modulus.Meanwhile,from the interrelationship among polymer melts density,polymer bulk elastic modulus and ultrasonic propagation velocity,the single valued mathematical expression between ultrasonic velocity and polymer melts density can be deduced and one-to-one correspondence between polymer melt density and ultrasonic velocity can be verified by experiments.