A measuring system for bulk and shear characterization of polymers
A measuring system for bulk and shear characterization of polymers
复制标题
DOI：
10.1007/s11340-006-8528-4
复制
发表时间：
2006-08-01
影响因子：
2.4
通讯作者：
Prodan, T.
中科院分区：
文献类型：
--
作者：
Emri, I.;Prodan, T.
本文介绍了一种新型的测量系统，用于研究压力和温度对时变聚合物材料力学性能的影响。该系统可同时测量固体聚合物样品在-50~+120℃温度范围内的体积和剪切松弛模数，精度为+/-0.01℃，在大气压力范围内为500~500 Mpa，精度为+/-0.1 Mpa。文中论证了该仪器的测量能力。介绍了聚乙酸乙烯酯(PVAc)的剪切松弛模数随时间、压力和温度的变化；比体积；体积蠕变柔量；热膨胀系数；体积模数；以及模拟材料在注射成型过程中暴露的条件的压降实验。剪切模量值的测量范围为1~4000兆帕，相对误差为3%。体积测量的误差为0.05%，相当于0.00005厘米(3)/克。所有情况下的结果都是测量的，没有额外的平滑或过滤。
This paper describes a novel measuring system for investigating the influence of pressure and temperature on the mechanical properties of time-dependent polymer materials. The system can measure the volume and the shear relaxation moduli of solid polymer specimens simultaneously subjected to temperatures from -50 to +120 degrees C with a precision of +/- 0.01 degrees C, and pressures from atmospheric to 500 MPa with a precision of +/- 0.1 MPa. The paper demonstrates the measuring capabilities of the apparatus. For poly(vinyl) acetate (PVAc) are presented sample measurements of the shear relaxation modulus as function of time, pressure and temperature; specific volume; the bulk creep compliance; the coefficient of thermal expansion; the bulk modulus; and the pressure drop experiments which simulate conditions to which a material is exposed during the injection molding process. The shear moduli may be measured in the range from 1 to 4,000 MPa with the relative error of 3%. The error of volumetric measurements is 0.05%, which corresponds to 0.00005 cm(3)/g. In all cases results are shown as measured, no additional smoothing or filtering was employed.