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- W3139013264 abstract "Abstract The molecular mobility of poly (propylene glycols) with molecular weights between 2000 and 18,200 g mol −1 was studied in the amorphous solid state, in the region of the glass transition and in the rubbery state; the experimental techniques used were differential scanning calorimetry (DSC) and thermally stimulated depolarization currents (TSDC). It was found that the glass transition temperature increases slightly with MW and tends to a limit value: T gDSC = −67°C, T gTSDC = −73°C. The different types of molecular mobility were analyzed: below T g the secondary relaxations, and above this temperature the normal mode, were characterized in detail using TSDC; in the glassy transformation region, around T g , the main relaxation was analyzed by both DSC and TSDC. It was found the dynamic fragility, m , behaves as independent of the molecular weight in the studied range: m DSC = 74 and m TSDC = 92. The TSDC results also show that, without influencing the kinetics of the segmental relaxation, the increase in molecular weight slows down the chain relaxation." @default.
- W3139013264 created "2021-03-29" @default.
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- W3139013264 date "2021-03-16" @default.
- W3139013264 modified "2023-10-17" @default.
- W3139013264 title "New contributions from thermal and dielectric techniques to the understanding of the dynamic properties of medium to long chain poly (propylene glycols)" @default.
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- W3139013264 doi "https://doi.org/10.1002/pen.25687" @default.
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