Molecular composite. II. Novel block copolymer and semi‐interpenetrating polymer network of rigid polyamide and flexible polyimide

Abstract

SYNOPSIS2,2'-Dimethyl-4,4'-diamino-biphenyl was used to prepare a lyotropic amine-terminated polyamide (PBTA) prepolymer with terephthaloyl dichloride, and an amide oligomer with reactive endcaps of maleimide, respectively. The former was employed in a n attempt to increase the solubility of P A / P I block copolymers, and the latter to produce a three-dimensional (isotropic ) reinforced molecular composite through the technology of a semiinterpenetrating polymer network ( semi-IPN ). PBTA prepolymer was copolymerized with an amine-terminated polyimide via a coupling reaction using terephthaloyl dichloride. The resultant block copolymers were characterized by IR, NMR, qinhr and GPC to confirm that the copolymerization reaction was precisely accomplished, as well as to determine their composition and molecular weight. Thermal analysis and lyotropic behavior were also studied for these copolymers. Rigid-rod amide oligomer was crosslinked in the presence of another flexible polyimide. Five sets of semi-IPN films were prepared under varying compositions. The curing conditions were investigated by DSC; in addition, the cured semi-IPNs exhibited a single phase (1 T,) according to examination by an instrument for thermally stimulated current (TSC) . No large-scale phase separation was observed in SEM images of the fractured surfaces.

Photoablation characteristics of novel polyimides synthesized for high-aspect-ratio excimer laser LIGA process

“…All the solvents used herein are commercially available and were used after they were distilled. 2, 2 -dimethyl-4, 4 -diamino-biphenylene (DMDB) was prepared according to the method described in the literature [28].…”

Preparation of Organic Soluble Polyimides and Their Applications in KrF Excimer Laser LIGA Process

“…The 2,29-dimethyl-4,49-diaminobiphenylene (DMDB) was prepared according to the method described in the literature. [25] The 3,39-dimethyl-4,49-biphenylenediamine (OT) (Aldrich Co.) was purified by recrystallization before use. 4,49-Hexafluoroisopropylidene-bis(phthalic anhydride) (6FDA) (Hoechst Co.) was used as received.…”

Polyimide-Epoxy Composites

“…In one, a linear or slightly crosslinked polymer is swollen by a monomer, followed by polymerization of the monomer. Another method is the utilization of simultaneous graft polymer-ization reactions resulting in a compatibilized in situ reaction state [56]. Another method that has recently achieved some popularity is the reactive blending of two oligomers.…”