## Abstract A series of poly(ether–ester) copolymers were synthesized from poly(2,6 dimethyl‐1,4‐phenylene oxide) (PPO) and poly(ethylene terephthalate) (PET). The synthesis was carried out by two‐step solution polymerization process. PET oligomers were synthesized via glycolysis and subsequently u
Synthesis and thermal analysis of copolyesters deriving from 1,4:3,6-dianhydrosorbitol, ethylene glycol, and terephthalic acid
✍ Scribed by R. Storbeck; M. Ballauff
- Publisher
- John Wiley and Sons
- Year
- 1996
- Tongue
- English
- Weight
- 290 KB
- Volume
- 59
- Category
- Article
- ISSN
- 0021-8995
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✦ Synopsis
The synthesis and analysis of copolyesters based on 1,4: 3,6-dianhydrosorbitol (DAS), ethylene glycol, and terephthalic acid is described. It is shown that these copolyesters present materials stable up to elevated temperatures. The glass transition temperature, Tg, is shown to rise linearly with increasing content of DAS to reach values well above 100°C. Thus, DAS derived from renewable resources is a highly interesting diol component for making technical polyesters.
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## Abstract magnified image The novel 1,4‐diethyl‐1,2,3,4‐tetrahydro‐7‐methoxyquinoxalin‐6‐carboxaldehyde was synthesized, characterized, and condensed with suitably substituted active methylene compounds by classical Knoevenagel condensation reaction to obtain novel monostyryl dyes **8a**, **8b**
## Abstract magnified image 1,4‐Diethyl‐1,2,3,4‐tetrahydro‐6‐nitroquinoxaline **4** was synthesized by alkylative reduction of 6‐nitroquinoxaline. Catalytic reduction of **4** followed by cyclocondensation with heterocyclic malondialdehydes afforded novel 8‐(heteroaryl)‐1,4‐diethyl‐1,2,3,4‐tetrahyd