ISSN:
0959-8103
Keywords:
aramid
;
isotropic solution
;
film
;
high strength
;
high modulus
;
fibrillation
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
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 (—CF3) 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/mm2). High modulus, 3.1 × 103 kg/mm2, was obtained in QDA/PPD copolymer films. Tensile strength and modulus increased with draw ratio. Tg and Tm were not seen by DSC and Td of the polymers was as high as c. 500°C. Excess drawing caused the films to be fibrillated, affecting their tensile properties.
Additional Material:
10 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/pi.1995.210360211
Permalink
