Open AccessPreparation and physical properties of poly(4,4′‐diamino‐3′‐carbamoylbenzanilide terephthalamide) and poly(4,4′‐diamino‐3′‐carbamoylbenzanilide isophthalamide) films
Author(s) -
Kang Seog Joo,
Hong Sung Il,
Park Chong Rae
Publication year - 2000
Publication title -
journal of polymer science part a: polymer chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.768
H-Index - 152
eISSN - 1099-0518
pISSN - 0887-624X
DOI - 10.1002/(sici)1099-0518(20000215)38:4<775::aid-pola13>3.0.co;2-n
Subject(s) - polymer chemistry , polyamide , poly(p phenylene) , polymer , ultimate tensile strength , materials science , solvent , modulus , aramid , chemistry , composite material , organic chemistry , fiber
To prepare thermally stable and high‐performance polymeric films, new solvent‐soluble aromatic polyamides with a carbamoyl pendant group, namely poly(4,4′‐diamino‐3′‐carbamoylbenzanilide terephthalamide) ( p ‐PDCBTA) and poly(4,4′‐diamino‐3′‐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 (E′) of 1 × 10 11 dyne/cm 2 (10 GPa) over the temperature range of room temperature to 400 °C. © 2000 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 38: 775–780, 2000