Showing papers by "Ming Qiu Zhang published in 1994"
TL;DR: The melting behavior of polyphenylene sulfide and its blends with PSF (bisphenol A polysulfone) and PEK-C (polyetherketone with phthalidylidene groups) are investigated with DSC technique as discussed by the authors.
Abstract: The melting behavior of PPS (polyphenylene sulfide) and its blends with PSF (bisphenol A polysulfone) and PEK-C (polyetherketone with phthalidylidene groups) are investigated with DSC technique. It is found that, with a rise in melt temperature Tmelt and melt time tmelt, the intensities of the lower melting peaks of PPS increase while those of the upper ones decrease or disappear in some cases, which can be attributed to the obstructive effect of branching or crosslinking of PPS macromolecules on the crystallization of PPS at higher temperature. As the annealing crystallization temperature increases, both the peak temperatures and intensities of the lower melting peaks of PPS increase. PSF and PEK-C have no influence on the lower melting peaks of PPS but are unfavorable to the crystallization of the higher melting species. The double melting behavior of the PPS component in the blends is much more susceptible to the changes in Tmelt and tmelt than that of neat PPS. © 1994 John Wiley & Sons, Inc.
21 citations
TL;DR: In this article, the Young's modulus of transcrystallinities in fiber/semicrystalline polymer systems was predicted by a well-known composite modeling theory.
Abstract: In a fiber/semicrystalline polymer system, interphasial transcrystallinities might form between the fibers and the matrix bulk that is composed of spherulites. By using an analogy method, the Young's modulus Et of transcrystallinities in their growth direction was predicted by a well-known composite modeling theory. It is shown that Et is a function of the polymeric lamellar morphology and crystallinity. It is higher than the Young's modulus Es of the bulk spherulites and positively affects the stiffness of the materials in which the transcrystallinities are formed. The study was focused on poly(ether ether ketone) (PEEK) but with polyethylene (PE) as a comparison. Also, it is demonstrated the various possibilities of the value ET and the ratio ET/Es for different polymeric matrices depending on their lamellar moduli and the amorphous-phase ones. © 1994 John Wiley & Sons, Inc.
5 citations