Papers by Author: Yong Yan Cui

Abstract: Effects of PMMA resin on the mechanical properties and processability of CPVC/PMMA(Chlorinated polyvinyl chloride/polymethyl methacrylate) blends were studied in this paper. The results showed, the impact strength of CPVC/PMMA blends were improved, the heat distortion temperature and tensile strength didn't reduce significantly when the content of PMMA was set to 15 phr, the melt viscosity decreased as the content of PMMA increased in the blends, and the surface gloss were improved. The miscibility of CPVC/PMMA blends in which the content of PMMA was set to 15 phr were studied. The microscopic structure of two-phase was also showed in the SEM micrographs.

Abstract: The effect of dynamic vulcanization on mechanical, rheological, thermal properties and morphology of ABS were studied in this paper. And the effect of shear stress, shear rate on melt rheological behavior were discussed. The results showed that: the melt of dynamic vulcanization modified ABS was pseudoplastic fluid, and its apparent viscosity was increased. Tensile strength, notched impact strength of dynamic vulcanization modified ABS increased gradually, and the melt flow rate decreased gradually .

Abstract: Dimethyl sulfoxide (DMSO) was added to the starch by melting processing. It was studied respectively that DMSO content effected on mechanical properties, flowabilities, water resistance properties, scanning electron micrographs (SEM) of DMSO-starch (TPS)/DMCS-soy protein isolates (DMCSSPI) materials. SEM results indicated that the crystalline of starch is destructed and the starch granules transferred to a continuous amorphous phase. It was found that the DMSO could more effectively restrain the retrogradation than the plasticizers, due to the stronger hydrogen bonds. For TPS/DMCSSPI composites, the increase of TPS content could make its water resistance properties worse. However, with DMSO content increase, its elongation at break and toughness could be enhanced.

Abstract: The aluminum metal matrix composites (Al MMCs) reinforced by SiC particles with different sizes (25 nm, 150 nm and 3.5 μm) were fabricated by powder metallurgy technique, and the microstructure and tensile properties of the Al MMCs were investigated. When the volume fraction of SiC particles is fixed to be 5 %, the Al MMCs reinforced by nanosized and submicron particles exhibit much higher ultimate tensile strength and yield strength, and much lower ductility compared with those of the non-reinforced aluminum. However, for the MMC reinforced by 3.5 m SiC particles, almost no strengthening effect is found. The strengthening effect of the Al MMCs is analyzed in terms of dislocation mechanism. Moreover, the tensile fracture surface shows that the damage mechanism of the Al MMCs can be changed as the size of SiC particles is changed.