A kinetic study of the benzene-induced crystallization of polyethylene terephthalate
| Autor: | R.P. Sheldon |
|---|---|
| Rok vydání: | 1962 |
| Předmět: |
Materials science
Polymers and Plastics Diffusion Organic Chemistry Kinetics Analytical chemistry Activation energy Kinetic energy law.invention chemistry.chemical_compound Crystallinity Volume (thermodynamics) chemistry law Polymer chemistry Materials Chemistry Polyethylene terephthalate Crystallization |
| Zdroj: | Polymer. 3:27-34 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/0032-3861(62)90063-0 |
| Popis: | A study has been made into some of the factors associated with the kinetics of the benzene-induced crystallization of polyethylene terephthalate. Four thicknesses of the film were used at temperatures of 25°, 30°, 35° and 40°C and in one case at 55°C. The rate was found to increase with increase of temperature and within the restricted range studied no tendency towards a maximum was detected. Making the usual assumptions between density and crystallinity the mathematical expression relating to the major part of the rate curves was found to have the form A′ − V A′ = C exp [−( C′ x 3 )( e −δE RT ) t] where A′ and V are the volume fractions of crystallinity at equilibrium and after time t respectively, C and C′ are constants, x is the specimen thickness, T is the temperature on the absolute scale, R the gas constant and E, which has the value of 10·3 kcal/mole, is identified with an activation energy term. It is believed that the crystallization process is diffusion controlled in that it probably occurs along a progressive front accompanying liquid diffusion. |
| Databáze: | OpenAIRE |
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