Preliminary Results in Measuring Dynamic Compressibilities
Preliminary Results in Measuring Dynamic Compressibilities
复制标题
测量动态压缩率的初步结果
DOI：
10.1063/1.1722106
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发表时间：
1955
影响因子：
3.2
通讯作者：
J. G. Brodnyan
中科院分区：
文献类型：
--
作者：
W. Philippoff;J. G. Brodnyan
为了补充剪切和弯曲中的动态测量，使用富兰克林研究所实验室的振动测试仪，利用谐波振动测量塑料的体积压缩率。研究了聚乙烯和增塑聚氯乙烯。压缩性的值是可比的静态值，因为他们是已知的。不能确定地检测到压力变化和体积变化之间的显著相移，使得体积模量B（达因/cm 2）不是复数。特别是对于聚乙烯，使用-25 ° C至+95 ° C的温度范围和0.0003至5 cps的频率范围。用Ferry的约化变量法可将所得等温线一起移动。从频率偏移aT，得到60千卡/摩尔的活化能。
In order to supplement dynamic measurements in shear and bending, the vibration tester of the Franklin Institute Laboratories was used to measure the bulk compressibility of plastics using harmonic vibrations. Polyethylene and plasticized polyvinyl chloride were investigated. The values of the compressibility were comparable to the static values as far as they are known. A noticeable phase shift between pressure changes and volume changes could not be detected with certainty so that the bulk modulus B in dynes/cm2 is not a complex quantity. Especially for the polyethylene, a temperature range from −25 to +95°C and a frequency range from 0.0003 to 5 cps was used. The isothermals obtained could be shifted together using the method of reduced variables of Ferry. From the frequency shifts aT, an activation energy of 60 kcal/mole was obtained.