Branching Effects in Physical Gelation of Atactic Polystyrene
| Autor: | Dominique Sarazin, Jean Georges Zilliox, Noureddine Lehsaini, Nawel Boudenne |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Materials science
Polymers and Plastics Rheometry Organic Chemistry Enthalpy Modulus Concentration effect Thermodynamics Young's modulus Branching (polymer chemistry) Inorganic Chemistry chemistry.chemical_compound symbols.namesake chemistry Polymer chemistry Materials Chemistry symbols Polystyrene Phase diagram |
| Zdroj: | Macromolecules. 27:4353-4358 |
| ISSN: | 1520-5835 0024-9297 |
| DOI: | 10.1021/ma00093a041 |
| Popis: | New results are given on the physical gelation of atactic polystyrene-CS 2 solutions in relation to the structure of the chains. We demonstrate here the starlike effect on the onset of gelation supported by well-improved techniques such as the ball-drop method, DSC, measurements of the static modulus, and oscillatory rheometry. The sol-gel phase diagrams show that the increase of the degree of branching has a noticeable impact on gel formation but with approximately constant melting enthalpy. The chemical junctions between branches in the star molecules result in an increase of the gelation temperature with respect to linear chains of equal concentration and overall molecular weight and in a decrease in the gel modulus at a given concentration |
| Databáze: | OpenAIRE |
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