Determination of Crystallinity by Gas Chromatography. Effect of Curvilinearity of Retention Diagrams

Solubility, swelling degree and crystallinity of carbon dioxide–polypropylene system

“…At low temperatures, the crystallinity values tended to remain constant, but at high temperatures, the crystallinity values decreased sharply. This tendency is consistent with the results of Braun and Guillet [41,42], which means that it is likely that the crystallinity values extrapolated to room temperature in this work, are close to the experimental crystallinity values. The crystallinity values calculated by this procedure are rough estimations for the changes in crystallinity of PP induced by CO 2 .…”

Solubility of propylene in semicrystalline polypropylene

“…Akiba et al24 pointed out that the crystallinity of polypropylene determined with DSC is smaller than that obtained with gas chromatography. In the chromatographic method, crystallinity was evaluated from Henry's constant for solute in polymer above and below the melting temperature of polymer 13, 14. Hence, the crystallinity obtained from the chromatographic method should be suitable for evaluation of the solubility.…”

“…Braun and Guillet13, 14 proposed a crystallinity determination method with a gas chromatographic technique. In the chromatographic method, temperature dependence of the crystallinity is obtained from temperature dependence of Henry's constant for solute.…”

Thermodynamic Properties of Poly(2‐[3‐(6‐tetralino)‐3‐methyl‐1‐cyclobutyl]‐2‐hydroxy ethyl methacrylate) and Poly[2‐(3‐mesityl‐3‐methyl‐1‐cyclobutyl)‐2‐oxoethyl methacrylate)

“…The values of molar heat (enthalpy), DH 1 s , the molar free energy, DG 1 s , the entropy, DS 1 s , of sorption of the probe absorbed by the PTMCBHEMA and PMCBOEMA and the weight fraction activity coefficient, V 1 1 , the partial molar free energy, DG 1 1 and the average partial molar enthalpy, DH 1 1 at infinite dilution of the organic solvents were calculated as in the literature (14)(15)(16). The molar heat (enthalpy), DH 1 s , molar free energy, DG 1 s , and the molar entropy, DS 1 s , of sorption of the probe absorbed by the PTMCBHEMA and PMCBOEMA are given by the following equations:…”