ABSTRACT:The wettability and surface energy of extruded ULTEM poly(ether imide) films strongly increased (the water contact angle varied from 75 to 38°and the surface energy varied from 45.3 to 59.5 mJ m Ϫ2 , respectively) with the deposition of an allylamine-plasma-polymerized layer and were characterized with X-ray photoelectron spectroscopy, scanning electron microscopy, and atomic force microscopy according to the experimental parameters. Pervaporation tests for dehydrating the water/ethanol azeotropic mixture were performed at 40°C with nontreated and plasma-treated ULTEM films for 15, 30, 60, and 120 min. No significant difference was noticed in the total flow (ca. 2.5 g/m 2 h) among the various films. However, for the 30-min duration, a great increase in the water selectivity from 850 to 10,850 was measured, and it was related to the higher N/C ratio and the presence of amide groups on the surface.

A systematic study was carried out to investigate the cataphoretic electrodeposition of polyetherimide from an aqueous medium onto an electrically conductive support (aluminum, steel mesh). The subsequent re-imidisation steps were also investigated. The yield and quality of deposited polyetherimide were found to be strongly dependent upon a number of formulation variables that are closely related to the emulsion composition and electrodeposition conditions. A polymer modi®ed to 70% with methylpiperazine and quaternised to 50% with lactic acid gave a stable emulsion at 6% w/w (seven days at 4±5°C). Maximum rate of deposition was obtained with an initial current density of 10 mA cm À2 in the voltage range of 40±68 V.

A systematic study was carried out to investigate the cataphoretic electrodeposition of polyetherimide from an aqueous medium onto an electrically conductive support (aluminum, steel mesh). The subsequent re‐imidisation steps were also investigated. The yield and quality of deposited polyetherimide were found to be strongly dependent upon a number of formulation variables that are closely related to the emulsion composition and electrodeposition conditions. A polymer modified to 70% with methylpiperazine and quaternised to 50% with lactic acid gave a stable emulsion at 6% w/w (seven days at 4–5 °C). Maximum rate of deposition was obtained with an initial current density of 10 mA cm−2 in the voltage range of 40–68 V. © 1999 Society of Chemical Industry

Preliminary results in this study show that it is possible to achieve a good Ultem 1000/carbon fibres covering by means of electrophoretical deposition. The expected amount of deposited polymer is well controlled and the deposited films have a good appearance. In this way a variety of carbon fibre composite materials can be manufactured. © 1999 Society of Chemical Industry

No abstract