Influence of sublimation of destruction products on the pattern of DSC thermograms of polymeric materials

Abstract

Differential scanning calorimetry thermograms measured for various polymers (atactic poly(methyl methacrylate), low density polyethylene, and polytetrafluoroethylene) are analyzed with allow ance for simultaneously obtained thermogravimetric analysis data. Special attention is paid to the interpre tation of "false" peaks arising owing to the synchronism of strong endothermic processes of sublimation of destruction products and other thermal processes.

PTFE as a toughness modifier of high‐performance PEI/PBT blends: Morphology control during melt processing

“…In Figure 4B, even though PEI and PTFE are first homogenized during step 1, PTFE phase does not interfere with PBT cold crystallization event observed for PEI‐rich blends. Regarding Tg of PTFE, it is not easily revealed due to its highly crystalline nature that may reach around 90% to 95% of crystallinity 5,33 …”

Thermal decomposition of polymethylmethacrylate and its composite with fullerene C-=SUB=-60-=/SUB=- after ultraviolet irradiation

“…Variations in the shapes of TDMS spectra of PMMA−fullerene mixtures are typically interpreted as a temperature shift of maxima of the monomer desorption stages as a result of thermally induced attachment of fullerene molecules to the radicals formed upon heating [6,7]. The data obtained show that emergence of new PMMA−fullerene binding states under UV irradiation prior to heating as such does not affect the positions of the non−irradiated PMMA decomposition stages.…”

“…Ultraviolet (UV) irradiation is an important element of processing polymer surfaces [1,2]. The method of thermal desorption mass−spectrometry (TDMS) and its widely used analog, namely, thermal gravimetric analysis, are often used to analyze molecular mechanisms for thermal decomposition of both neat polymers and their composites [3][4][5][6][7][8], including those after irradiation. TDMS spectra of monomers of polymethylmethacrylate (PMMA) homologues can depend on the thickness of heated films [9].…”