The classical free volume theory is modified semi-empirically to derive an expression useful for predicting the glass transition temperatures (T~) for compatible polymer blends. This equation produccs values of T~ in better agreement than those from the Kelley-Bueche equation with the dilatomctric d
Theoretical calculations of glass transition temperatures of plasticized polymers
β Scribed by T. Czekaj; J. Kapko
- Publisher
- Elsevier Science
- Year
- 1981
- Tongue
- English
- Weight
- 188 KB
- Volume
- 17
- Category
- Article
- ISSN
- 0014-3057
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β¦ Synopsis
Based on free volume, an equation has been derived enabling calculation of glass transition temperature (To) of plasticized polymers, knowing the plasticizer content, the thermal expansion coefficients and values of To of the polymer and plasticizer. Determined and calculated TO are in satisfactory agreement up to the plasticizer concentration which dissolves the polymer.
π SIMILAR VOLUMES
Many parameters of polymers exhibit breaks when temperature passes through glass transition. It is also often assumed that fractional free volume (FFV) at the glass transition temperature (T g ) has a standard value (the isofree volume concept). As gas diffusion (D) and permeability (P) coefficients
## Abstract The miscibility of different polymer blends was studied with dynamic mechanical thermal analysis (DMTA) in conjunction with differential scanning calorimetry (DSC). The blends were prepared by melt mixing polymers having similar glass transitions such as polyglutarimide (PGI), styreneβ_