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Sep 6, 2018
Physical heat resistance and temperature
It refers to a material in the heatresistance while maintaining performance available can withstand temperatures.Usually a glass transition temperature TG is represented. As astructural material, the design temperature should be in the following TG30 ~ 50 ℃. As a non-structural materials, insulating materials, the use oftemperature can be higher.
So to answer "How much of thismaterial may be in use?" This question is quite complex This is becauseyou intend to use long time: thousands of hours of continuous use, or requireonly a few minutes resistance (for example, requires the use of aircraft at apredetermined temperature tens of thousands of hours, minutes and missilecapability is enough. Polymer materials currently used for aircraft structuralmaterials at 300 ℃ long-term use is not easy. As for the missiles, it requires the useis possible at 400 ℃. In addition, and use what medium factors.
Therefore, it must explain conditions ofuse in order to answer this question. For questions answered temperaturematerials have been used in the past at certain temperature weightlessnessmaterial (or changes in other properties) extrapolation. However, for practicalapplications, the reliability of such data is not sufficient. Especially forimportant material. Such as structural materials for aircraft, the key parts ofthe insulation materials. The most reliable method is measurement isothermallyaging, the test is carried out before the actual use temperature, to obtain thereal design data.
Asa class of polyimide heat-resistant molecule, the thermal decomposition andthermal oxidative decomposition of the earliest studies. The main work reportsare published in the 1960s and 1970s. Thermal decomposition of soybean thermalgravimetric analysis. With a constant temperature and climate changes in lawsmass of the sample was observed. In order to analyze the composition of thedecomposition of gas, pyrolysis gas chromatography and mass spectrometry can beused with. But only one temperature to do a surgery is very complicated. Thisyear's re-emergence heat - Chromatography method can give a variety of changesin the quality of the decomposition of the sample and the change in the amountof gas in a heating process, so research is a powerful means of thermaldecomposition.