Preparation and physical properties of poly(4,4′-diamino-3′-carbamoylbenzanilide terephthalamide) and poly(4,4′-diamino-3′-carbamoylbenzanilide isophthalamide) films

✍ Scribed by Seog Joo Kang; Sung Il Hong; Chong Rae Park

• Publisher: John Wiley and Sons
• Year: 2000
• Tongue: English
• Weight: 140 KB
• Volume: 38
• Category: Article
• ISSN: 0887-624X
• DOI: 10.1002/(sici)1099-0518(20000215)38:4<775::aid-pola13>3.0.co;2-n

✦ Synopsis

To prepare thermally stable and high-performance polymeric films, new solvent-soluble aromatic polyamides with a carbamoyl pendant group, namely poly(4,4Јdiamino-3Ј-carbamoylbenzanilide terephthalamide) (p-PDCBTA) and poly(4,4Ј-diamino-3Ј-carbamoylbenzanilide isophthalamide) (m-PDCBTA), were synthesized. The polymers were cyclized at around 200 to 350 °C to form quinazolone and benzoxazinone units along the polymer backbone. The decomposition onset temperatures of the cyclized m-and p-PDCBTAs were 457 and 524 °C, respectively, lower than that of poly(p-phenylene terephthalamide) (566 °C). For the p-PDCBTA film drawn by 40% and heat-treated, the tensile strength and Young's modulus were 421 MPa and 16.4 GPa, respectively. The film cyclized at 350 °C showed a storage modulus (EЈ) of 1 ϫ 10 11 dyne/cm 2 (10 GPa) over the temperature range of room temperature to 400 °C.