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
Helical Superstructures from Charged Poly(styrene)-Poly(isocyanodipeptide) Block Copolymers
β Scribed by Cornelissen, J. J.
- Book ID
- 115533664
- Publisher
- American Association for the Advancement of Science
- Year
- 1998
- Tongue
- English
- Weight
- 744 KB
- Volume
- 280
- Category
- Article
- ISSN
- 0036-8075
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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
Osmotic pressure data, obtained from a study of four block copolymers, have been used to calculate second virial coefficients and number average molecular weights. The virial coefficients were determined over a range of temperatures in toluene and cyclohexane. The theta temperatures, entropy of dilu