The states of water within poly(vinyl alcohol) thin films part 1: Investigations by positron annihilation lifetime spectroscopy
- Monash Univ., Clayton Victoria (Australia)
In order to produce poly(vinyl alcohol) (PVA) material suitable for thermoplastic processing, it is necessary to plasticize the polymer with water. In the present study the accommodation of water within the PVA network is examined. Positron annihilation lifetime spectroscopy (PALS) is used to determine the effect of water on the free volume of the polymer. The PALS parameters give information on the average size of the free volume sites and the relative concentration of free volume sites. A model is proposed in which water initially enters the polymer in a molecular form, distributing itself along and becoming bound to the polymer chains at hydroxyl sites. Further water sorption increases the existing polymeric free volume up to a certain limiting value whilst at the same time water clustering occurs resulting in states similar to bulk water.
- OSTI ID:
- 141764
- Report Number(s):
- CONF-930304-; TRN: 93:003688-1448
- Resource Relation:
- Conference: 205. American Chemical Society national meeting, Denver, CO (United States), 28 Mar - 2 Apr 1993; Other Information: PBD: 1993; Related Information: Is Part Of 205th ACS national meeting; PB: 1951 p.
- Country of Publication:
- United States
- Language:
- English
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