Optimizing the high-temperature energy storage characteristics of dielectrics is great significance for development pulsed power devices and control systems. Selecting a polymer with higher glass transition temperature (Tg) as matrix one effective ways to increase upper limit operating temperature. However, current high-Tg polymers have limitations, it difficult meet demand only polymer. For ex...

in this research, process asymmetric polyetherimide hollow fiber membranes using ethanol (0, 2 and 4 wt%) as non-solvent additive in the polymer dope via phase inversion method were fabricated. aqueous solution of 1-methyl-2-pyrrolidine (nmp) (90%) was applied as a bore fluid to avoid inner skin layer formation and water was used as the external coagulant. the morphology of fabricated membranes...

A two-stage embossing technique for fabricating microchannels for microfluidic devices is presented. A micromachined aluminum mold is used o emboss a polyetherimide (PEI) substrate with a relatively high glass transition temperature (T ). The embossed PEI is then used as a mold for g mbossing an amorphous polyethylene terephthalate (APET) substrate with a lower Tg. The resulting APET substrate ...

Abstract Increasing the surface hydrophilicity of polyetherimide (PEI) through partial hydrolysis imide groups while maintaining length main-chain was explored for adjusting its function in biomedical and membrane applications. The outcome polymer analogous reaction, i.e., degree ring opening chain cleavage, is difficult to address bulk microstructured systems, as these changes only occur at in...

The present study deals with the quasi-static and high strain rate characterization of Kevlar-129 based thermoplastic composites. Two different matrices, namely, Polypropylene (PP) Polyetherimide (PEI) were used to manufacture composite laminates. Quasi-static compression tests performed at rates 0.041 s ?1 0.045 . High using a split Hopkinson pressure bar apparatus within ranging from 2548 437...

Micromachined polymer surfaces often lack smooth optical finish. Here we present a simple device for polishing these surfaces by stream of vapor of aggressive solvent. Depending on exposition, the initial roughness may be partially or completely removed, at the expense of slight smoothing of sharp angles within the modified area. Unlike the industrial techniques of vapor treatment of large area...