Block copolymers with polyester-urethane and polymethyl methacrylate (PMMA) or polystyrene (PS) sequences were obtained by the use of polyester-or polyether-urethane macroazo initiators (PUMAI). PUMAI with a well-defined number of azo groups per chain were prepared via a two-stage reaction procedure
Separation of poly(styrene–methyl methacrylate) block copolymers by liquid adsorption chromatography
✍ Scribed by Sadao Mori
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 453 KB
- Volume
- 38
- Category
- Article
- ISSN
- 0021-8995
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The two-phase structure of polymer blends or block copolymers prepared with polyurethane macroazo initiators and methyl methacrylate or styrene have been studied. The synthesis of these block copolymers was reported in a previous article (Cheikhalard, et al. J Appl Polym Sci 1998, 70, 613-627). One
The end groups of styrene-methyl methacrylate (St-MMA) copolymers polymerized radically with 2,2Ј-azobisisobutyronitrile (AIBN) as an initiator, which are difficult to characterize even by NMR, were investigated by pyrolysis-gas chromatography. On the resulting pyrograms, characteristic products tha