Abstract
The influence of blend composition on enthalpy-relaxation behaviour was assessed for miscible blends of poly(4-hydroxy styrene)/poly(vinyl methyl ether) (PHS/PVME). Values of enthalpy lost (?H(Ta, ta)) were calculated from experimental data plotted against log (ta) and modelled using the Cowie-Ferguson (CF) expression. This gives a set of values for three adjustable parameters, ?H8(Ta), log (tc) and ß. Positron annihilation lifetime spectroscopy (PALS) measurements indicated that all of the blends, except the blend with 59 mol% of the PHS component, have greater free volume than pure PHS. Furthermore, infrared spectroscopy was useful for assessing the hydrogen-bonding interactions in the blends. The ageing results are discussed with reference to the strength of the interactions and free volumes, and are compared with related systems. © 2005 Society of Chemical Industry.
Original language | English |
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Pages (from-to) | 749-756 |
Number of pages | 8 |
Journal | Polymer International |
Volume | 55 |
Issue number | 7 |
DOIs | |
Publication status | Published - Jul 2006 |
Keywords
- Ageing
- Blends
- Enthalpy relaxation
- FTIR spectroscopy
- Hydrogen bonding