Knit lines in reaction injection moldings

Abstract

Knit lines in reaction injection molding (RIM) are formed when a fluid flow front passes through the mold cavity and must pass around objects in its path. Factors were ordered in importance of their effects on the deterioration in mechanical strength associated with knit lines. In order of decreasing importance, reactcmt temperature, mold temperature, and relah've location Cfrom the product) of the knit line sample were found to affect the knit line strength.

Regulation of micromorphology and proton conductivity of sulfonated polyimide/crosslinked PNIPAm semi‐interpenetrating networks by hydrogen bonding

“…There is an increasing amount of research seeking alternative PEM materials such as sulfonated perfluoro‐polymer membranes with lower cost and good overall performance to replace perfluorosulfonic acid type membranes. Among promising fuel cell membrane materials, aromatic polymer acid type membranes have gained much attention. For example, sulfonated polyimide (SPI), sulfonated poly(aryl ether ether), sulfonated poly(ether sulfone), sulfonated polybenzimidazol and sulfonated poly(ether ether ketone) have been widely studied as promising candidates for PEMs.…”