The physical aging of three amorphous polyesters, polyethylene terephthalate, polyethylene napthalate, and polycyclohexane dimethanol terephthalate, was characterized by enthalpy relaxation via the Tool-Narayanaswamy methodology. Subtle differences in the activation energy, relaxation times, and dis
Physical aging and enthalpy relaxation in polypropylene
β Scribed by J.M. Hutchinson; U. Kriesten
- Book ID
- 115990029
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 337 KB
- Volume
- 172-174
- Category
- Article
- ISSN
- 0022-3093
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The enthalpy changes DH Ο± between a poly(vinyl acetate) glass formed by rapid cooling and the corresponding fully relaxed glass have been estimated at four temperatures below the glass transition. The values obtained were different to those expected by extrapolating liquid behavior below the glass t