Cr 39 glass transition temperature
Glass transition. Their Tg values are well above room temperature, both at around 100 C (212 F). Rubber elastomers like polyisoprene and polyisobutylene are used above their Tg, that is, in the rubbery state, where they are soft and flexible.of CR39 polymer due to thermal annealing above its glass transition temperature. Optical band gap of pristine and thermally annealed samples has been determined using UVVisible absorption spectra. cr 39 glass transition temperature
Effect of thermal annealing on optical properties of CR39 polymeric track detector. Results and discussions Figure 2 presents the UVVisible absorption spectra of CR39 virgin and thermally annealed samples at different temperatures ranging from oC for 1 hour. Optical Density Wavelength (nm) Figure 2.
The relaxational behavior of CR39 (poly allyl diglycol carbonate) nuclear track detectors was determined over a large temperature range (100 to 125C) including the glassy, glass transition, and ionic conduction regions by means of dynamic mechanical and dielectrical measurements, differential scanning colorimetry, linear coefficient of expansion, and especially thermally stimulated current methods owing of CR39 polymer due to thermal annealing above its glass transition temperature. Optical band gap of pristine and thermally annealed samples has been determined using UVVisible absorption spectra.cr 39 glass transition temperature Keywords. This is is true for the commonly used curing of CR39 where the glass transition temperature corresponds to the highest temperature of the curing cycle and where the remaining concentration of unpolymerised allyl groups is about 5 (Portwood and Stejny, 1984; O'Donnell and O'Sullivan, 1981).