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Organo‐soluble aromatic polyamide films
Author(s) -
Lee Chul Joo,
Park Seung Koo,
Kim Sang Yup,
Lee Yun Joo,
Min Byung Ghyl,
Son Tae Won,
Kim Byong Chul
Publication year - 1995
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1995.210360211
Subject(s) - materials science , terephthaloyl chloride , ultimate tensile strength , diamine , aramid , polymer chemistry , copolymer , monomer , polyamide , polymerization , polymer , composite material , fiber
To make stable isotropic aramid solutions and films, 6‐amino‐2‐(4‐aminopheyl)‐4‐phenyl quinoline (QDA) was used as base diamine, and copolymerized using terephthaloyl chloride (TPC) with p ‐phenylene diamine (PPD), 2,2′‐bis(trifluoromethyl)benzidine (PFMB), and oxydianiline (ODA) as second diamine, respectively. Homogeneous viscous polymerization solutions based on QDA were obtained, and films prepared from them were transparent and amorphous. The reactivity of QDA with TPC was almost equal to that of PPD; the reactivity of PFMB was low due to the electron withdrawing groups (CF 3 ) attached to the ortho positions of the benzene rings. Bulkiness and flexibility of the monomer structure widened the of stable conditions in polymer solution. A rod‐like structure of the monomer caused drawbility to decrease. QDA/ODA copolymer films could be drawn well, probably as a result of the flexible linkage of ODA, and had high tensile strength (86 kg/mm 2 ). High modulus, 3.1 × 10 3 kg/mm 2 , was obtained in QDA/PPD copolymer films. Tensile strength and modulus increased with draw ratio. T g and T m were not seen by DSC and T d of the polymers was as high as c . 500°C. Excess drawing caused the films to be fibrillated, affecting their tensile properties.