Toughened polystyrene containing block, graded block and randomized copolymers of butadiene-styrene
| Autor: | H.J. Michels, Geoffrey Allen, K. Sardelis |
|---|---|
| Rok vydání: | 1987 |
| Předmět: |
Materials science
Polymers and Plastics Organic Chemistry technology industry and agriculture Styrene chemistry.chemical_compound Polybutadiene Natural rubber chemistry Polymerization visual_art Phase (matter) Polymer chemistry Materials Chemistry visual_art.visual_art_medium Copolymer Lamellar structure Polystyrene |
| Zdroj: | Polymer. 28:244-250 |
| ISSN: | 0032-3861 |
| DOI: | 10.1016/0032-3861(87)90412-5 |
| Popis: | During the polymerization of styrene in the presence of a block, graded block, or randomized copolymer of butadiene-styrene, new morphologies of dispersed rubber particles are observed (i.e. cylindrical-type, coreshell, lamellar). These morphologies are the result of (i) polymer-polymer interactions between the copolymer and the ‘ in situ ’ formed polystyrene, (ii) an intramolecular phase separation within the polybutadiene and polystyrene sequences of the copolymer, and (iii) the mechanical treatment during the polymerization process. Elucidation of the structural characteristics of these morphologies has been achieved by following the phase changes during the polymerization and the changes in the intramolecular phase separation of the copolymers with respect to variation of their composition. The randomized copolymers were capable of forming toughened polystyrene blends with similar morphology to those containing polybutadiene rubber, but with enhanced adhesion between the rubber and polystyrene matrix. The structural characteristics of such randomized copolymers have been established. |
| Databáze: | OpenAIRE |
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