Abstract
We investigated the effects of solvent type (mono-ester vs. di-ester solvent) and aging on the structural development in the poly(vinyl chloride)/butyl benzoate (PVC/BB) and PVC/dibutyl phthalate(DBP) gels, as well as on their viscoelastic and mechanical behaviors. It was found that aged PVC/DBP gels held at RT for 7 days exhibit an improvement of about 100% in storage modulus (G′) compared to fresh gels, with a sudden drop in G' around 50 °C, whereas the storage moduli of the PVC/BB gels decrease monotonically with temperature, irrespective of the postaging time. These different behaviors of the PVC/BB and PVC/DBP gels arise mainly because of the difference in the network structure produced by the formation of the polymer-solvent complex between the C=O groups of the solvent and the polarized hydrogen moieties of PVC, as was confirmed with small angle X-ray scattering and uniaxial tensile experiments.
| Original language | English |
|---|---|
| Pages (from-to) | 263-271 |
| Number of pages | 9 |
| Journal | Journal of Polymer Science, Part B: Polymer Physics |
| Volume | 46 |
| Issue number | 3 |
| DOIs | |
| State | Published - 1 Feb 2008 |
| Externally published | Yes |
Keywords
- Aging
- Gel network
- Gels
- Polyvinyl chloride
- SAXS
- Thermoreversible