The depression of the glass transition temperature by water was studied in a set of polyurethanes in which the soft segment consisted of polyethylene oxide (sample I ) or a block copolymer of poly (propylene oxide) terminated with poly (ethylene oxide) in various proportions (sample set 11). DSC mea
Understanding the effect of chain entanglement on the glass transition of a hydrophilic polymer
โ Scribed by Xiaolin Lu; Gi Xue; Yongli Mi
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 589 KB
- Volume
- 119
- Category
- Article
- ISSN
- 0021-8995
No coin nor oath required. For personal study only.
๐ SIMILAR VOLUMES
The magnitude of the activation energy for diffusion, ED. is shown to be inversely dependent on the fractional free volume of the polymer above Tg. From the proportionality of ED above and below Tg, the magnitude of El, below T, is also inversely dependent on the free volume in that temperature rang
## Abstract The glass transition of human hair and its dependence on water content were determined by means of differential scanning calorimetry (DSC). The relationship between the data is suitably described by the Fox equation, yielding for human hair a glass transition temperature of __T__~g~ = 1