Morphosynthesis of poly[4‐(1,4‐phenylene)oxyphthalimide] and copolymers prepared by reaction‐induced crystallization during polymerization

Abstract

Morphosynthesis of poly[4‐(1,4‐phenylene)oxyphthalimide] (POPI) and poly[4‐(1,4‐phenylene)oxyphthalimide‐co‐4‐phthalimide] (POPI‐PPI) was examined by using the crystallization during the polymerization. The POPI fibrillar crystals were obtained as precipitates with the formation of spherical aggregates of plate‐like crystals. Some of the POPI fibrillar crystals were longer than 15 μm. They possessed high crystallinity and the molecules aligned perpendicular to the long direction of the fibers. On the other hand, one‐dimensional structures of POPI‐PPI such as ribbon, cone, rod, and fiber were obtained as precipitates by the copolymerization. The copolymer molecules might align along the long direction of the cone‐like crystals. The morphology of these poly(ether‐imide)s could be controlled by not only the polymerization condition but also with the aid of copolymerization. © 2012 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2012

Effect of PS‐b‐PCL block copolymer on reaction‐induced phase separation in epoxy/PEI blend

“…During isothermal curing, the molar mass of the epoxy resin increases, resulting in an increase of cross‐linking density. The thermoplastic polymer is then no longer miscible with the cross‐linked epoxy and phase separation occurs . This kind of phase separation is defined as reaction‐induced phase separation (RIPS).…”

“…The thermoplastic polymer is then no longer miscible with the cross-linked epoxy and phase separation occurs. 11,12 This kind of phase separation is defined as reaction-induced phase separation (RIPS). Two kinds of phase diagram are investigated, the upper critical solution temperature and the lower critical solution temperature.…”