METHOD OF DETERMINING THERMOMECHANICAL PROPERTIES OF POLYMER COMPOSITE MATERIALS Russian patent published in 2015 - IPC G01N3/18 G01N25/12 

FIELD: chemistry.

SUBSTANCE: sample in the form of a constant cross-section rod with pivotally attached ends is subjected to longitudinal bending to a given flexure/tension value, followed by heating the sample under constant flexure while measuring change in axial force, and heating temperature. In order to plot a thermomechanical curve and determine the initial transition temperature T_it, the glass transition temperature T_g and α-transition temperature T_α, longitudinal loading of the sample is carried out to a flexure/tension values which prevent breakdown thereof in the investigated temperature range, which correspond to 0.05-0.1 times the breakdown flexure/tension of the sample, and in order to determine heat resistance, longitudinal loading is carried out to flexure/tension values which guarantee breakdown of the sample in the investigated temperature range, preferably 0.1-0.5 times the breakdown flexure/tension, wherein heat resistance of the sample is determined as temperature at which it breaks down.

EFFECT: high reliability of obtained results, enabling determination of the complex characteristic of the polymer composite material - heat resistance thereof.

2 cl, 3 dwg