| Autor: |
Rivas, Bernabé L., Canessa, Guido S., Luna, Maribel, Rabagliati, Franco M., Novi, Marino, Preston, Jack |
| Zdroj: |
Macromolecular Chemistry and Physics; April 2001, Vol. 202 Issue: 7 p1053-1059, 7p |
| Abstrakt: |
Block copolymers containing a rigid poly(p-benzamide) and a flexible poly(propylene glycol) segment were synthesized by coupling aniline terminated poly(p-benzamide) with either poly(propylene glycol) or poly-(propylene glycol) monobutyl ether activated with terminal p-(chlorocarbonyl)benzoyl end-groups. These coupling reactions were carried out at temperatures between 22°C and 40°C, with various feed reagent ratios. To eliminate the low molecular weight fractions of homopolymers and copolymers, a solubility criterion at constant temperature was used. At 30°C it is possible separate a soluble and insoluble fraction in DMAc. The molecular weight of the soluble fractions ranged between 9 300 and 13 100 g/mol. All the copolymers were characterized by FT-IR spectroscopy, thermal analysis, and viscosity. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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