material behavior at subambient temperature
material behavior at subambient temperature
(OP)
I am perfoming subambient Tg test on a thermosetting prepreg. However, I am not clearly understand what happen to the prepreg at extremely cold temperature ? and what happen to the prepreg when heating up from cold temperature to room temperature.
This is what I know:
At extremely cold temperature, themosetting molecules are freezed and they have very minimal mobility, which the material state is like solid. When heating it up, the mobility of molecules are increasing, which resulting relaxation of polymers. As such, the material state is changing from solid to rubbery state.
However, I feel like this explaination have some problem, perhap someone could help me with clear understanding of this phenomenon.
This is what I know:
At extremely cold temperature, themosetting molecules are freezed and they have very minimal mobility, which the material state is like solid. When heating it up, the mobility of molecules are increasing, which resulting relaxation of polymers. As such, the material state is changing from solid to rubbery state.
However, I feel like this explaination have some problem, perhap someone could help me with clear understanding of this phenomenon.





RE: material behavior at subambient temperature
Of course if you heat the epoxy enough it will react and become permanently hard.
Chris DeArmitt PhD FRSC CChem
RE: material behavior at subambient temperature
RE: material behavior at subambient temperature
In addition to that, do you know who is moisture effect on subTg determination? I'd been told by someone that moisture has no effect on DSC's results, I wonder if it is right or not?
RE: material behavior at subambient temperature