Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
5204029 | Polymer Degradation and Stability | 2010 | 8 Pages |
Abstract
Thermally stable hyperbranched polyamide-ethers (HBPAEs) containing pyrimidine moieties were synthesized using new AB2 type monomer, 6-hydroxy-2,4-bis(4â²-nitrobenzamide)pyrimidine (NAL), which was prepared through amidation and its structural characterization was made by FTIR, 1H, 13C NMR spectrometry and elemental analysis. Polymerization of NAL proceeded homogeneously to yield a gel-free polymer (HBPAE 1). End group derivatization of nitro-terminated HBPAE 1 yielded HBPAE 2 and 3. FTIR confirmed the structure and complete modification of ensuing polymers. DB and inherent viscosity (ηinh) of HBPAE 1 was found to be 0.41 and 0.23 dL/g, respectively. Modified HBPAE 2 and 3 were soluble in various organic solvents including NMP, DMAc and DMSO but amorphous HBPAE 1 was partially soluble in DMF. Glass transition temperature (Tg) of thermally stable HBPAEs was affected by nature of end groups as well as introduction of pyrimidine rings.
Related Topics
Physical Sciences and Engineering
Chemistry
Organic Chemistry
Authors
Saima Shabbir, Sonia Zulfiqar, Zahoor Ahmad, Muhammad Ilyas Sarwar,