A new method for the simultaneous determination of surface tension and density of polymer melts
A new method for the simultaneous determination of surface tension and density of polymer melts
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DOI：
10.1039/a903282g
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发表时间：
1999
影响因子：
3.3
通讯作者：
M. Wulf;S. Michel;W. Jenschke;P. Uhlmann;K. Grundke
中科院分区：
文献类型：
--
作者：
M. Wulf;S. Michel;W. Jenschke;P. Uhlmann;K. Grundke
通过采用伍尔夫金属公司最近提出的一种新策略。，轴对称液滴形状分析（ADSA）可用于同时确定高温下无柄液滴聚合物熔体的表面张力和密度。这需要对ADSA算法进行修改，以液滴的质量代替密度作为输入参数，并开发一个可以精确控制温度的封闭高温室。此外，还需要特殊的样品支架，以便在高温下形成垂坠式和固定式液滴。近年来，它们的设计得到了改进，本文对此进行了描述。对于商用环氧树脂（DER 664 UE），研究表明，采用固定式液滴测量得到的表面张力值和温度系数与采用悬垂式液滴测量结果基本相同。ADSA测定的密度与独立PVT结果相当。
By employing a new strategy presented recently by Wulf etal., axisymmetric drop shape analysis (ADSA) can be used to determine simultaneously the surface tension and the density of polymer melts from sessile drops at elevated temperatures. This required the modification of the ADSA algorithm to replace the density by the mass of the drop as input parameter and the development of a closed high temperature chamber whose temperature can be precisely controlled. In addition, special sample holders for the formation of pendant and sessile drops at elevated temperatures were needed. Recently, their design has been improved, which is described in this paper. For a commercial epoxy resin (DER 664 UE), it is shown that measurements with sessile drops yield essentially the same surface tension values and temperature coefficients as with pendant drops. The densities determined with ADSA are comparable to independent PVT results.