The random copolymerization of 3,3'-dimethy1-4,4'-diaminobiphenyl (OTOL) and 3,3', 4,4'-biphenyltetra-carboxylic dianhydride (BPDA) with two comonomers, j.e., 4,4'-diaminodiphenyl ether (ODA) and 2,2'-bis(trifluoromethy1)-4,4'-diaminobipheny1 (PFMB), was carried out using the one-step method in p-chlorophenol. Several copolymers were obtained that were soluble in p-chlorophenol. In the first series the copolymers' intrinsic viscosities ranged from 4.35 to 5.43 dL/g. The copolymers were dry-jet wet spun into fibers directly from their polymerization mixtures. The fibers were drawn to higher draw ratios of 4.5 to 6.0. The tensile strengths of the fibers were between 7.67 and 16.28 g/d. The second polymers had intrinsic viscosities of 3.48 to 6.98 dL/g. The draw ratios of fibers were much increased. Fibers of the copolymers displayed tensile strengths as high as 15.10 g/d and moduli as high as 810 g/d.

p-Chlorophenol 용제를 사용하여 1단계 방법으로 3,3'-dimethy1-4,4'-diaminobiphenyl(OTOL)와 3,3',4,4'-biphenyltetra-carboxylic dianhydride(BPDA), 그리고 두 단량체, 4,4'-diaminodiphenyl ether(ODA)와 2,2'-bis(trifluoromethyl)-4,4'-diaminobipheny1(PFMB)를 사용하여, p-chlorophenol에 녹는 여러가지 공중합체를 만들었다. 첫번째 단량체로 만든 공중합체의 점도는 4.35∼5.43 dL/g였다. 이 공중합체 용액을 방사하여 섬유를 만들었으며 이들의 인장강도는 7.67∼16.28 g/d였다. 두번째 단량체를 만든 공중합체의 점도는 3.48∼6.98 dL/g 였고, 이공중합체 용액을 방사하여 만든 섬유의 최고 인장강도는 15.10 g/d, 최대 탄성율의 값은 810g/d 였다.

Keywords: polyimide fibers; dry-jet wet; tensile strength; nodulus; copolymerization