Papers by Author: Meng Yao

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Authors: Ming Tao Run, Wen Zhou, Bing Tao Xing, Meng Yao
Abstract: The crystal morphology and thermal properties of the PA6/PP-g-MAH/POE blends prepared by twin-screw extruder were studied by polarized optical microscopy (POM) and differential scanning calorimetry (DSC) respectively. The results suggest that the crystal morphology of PA6 is acicular crystal while PP-g-MAH is micro-spherulites; The acicular crystals form across POE phase to PA6 phase, and the acicular crystals of PA6 in the POE phase have better regularity in dimension than those in amorphous PA6 phase. Acting as a compatibilizer, PP-g-MAH improves the miscibility of PA6 and POE, leading to the glass transition temperature of the blends decreases gradually with increasing POE contents. PA6 and PP-g-MAH can crystallize individually, and the formed PA6 crystals induced the crystallization of PP-g-MAH at higher temperature; furthermore, PP-g-MAH and POE components can increase the crystallization rate of PA6.
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Authors: Ming Tao Run, Na Li, Bing Tao Xing, Meng Yao, Wen Zhou
Abstract: The dynamic mechanical properties, phase morphology and thermal stability of the poly(trimethylene terephthalate)/maleinized poly(octene-ethylene)/organo-montmorillonite nanocomposites (PTT/POE/OMMT) were investigated by using the thermodynamic mechanical analyzer (DMA), transmission electron microscopy (TEM) and thermal gravimetric analyzer (TGA), respectively. The results suggest that the modulus of elasticity of the PTT/POE/OMMT nanocomposite increases, and the glass transition temperature first slightly decreases and then increases with increasing OMMT content because that the TPP plays the role of plasticizer and OMMT plays the role of reinforcing agent. OMMT disperse evenly in the polymer matrix with most of the strip-like sheet morphology. The addition of the OMMT does not apparently affect the thermal stability of the PTT/POE/OMMT nanocomposite.
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Authors: Ming Tao Run, Zi Yu Qi, Meng Yao, Wen Zhou, Bing Tao Xing
Abstract: The phase morphology and dynamic rheology of poly (trimethylene terephthalate)/maleinized poly (octene-ethylene)/organo-montmorillonite nanocomposites were investigated by using transmission electron microscopy (TEM) and rotational rheometer. The results suggest that some of the OMMT are peeled off and the nanosheets are dispersed evenly in the polymer matrix. When the OMMT content is more than 4%, they are tended to form the aggregates in nanocomposites. The nanocomposites’ melt are pseudo-plastic fluid, and both complex viscosity and shear storage modulus increase with increasing OMMT content due to the interaction between the OMMT and polymers. The nanocomposites’ melt show more elasticity behavior with more OMMT content especially at low shear frequencies.
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Authors: Ming Tao Run, Meng Yao, Bing Tao Xing, Wen Zhou
Abstract: The rheology, morphology and mechanical properties of the PA6/PP-g-MAH/POE blends prepared by twin-screw extruder were studied by rheometer, scanning electron microscopy, universal tester and impact tester, respectively. The results suggest that the impact strength is improved by the POE acting as a toughening agent, while the compatibility of PA6 and POE is improved by the compatibilizer of PP-g-MAH. Furthermore, the PP-g-MAH component also acts as a reinforcing agent for decreasing the strength depression induced by the POE component. When POE content is about 9 wt% and PP-g-MAH content is about 10% in blends, the blend has the maximum tensile strength and impact strength. All melts of PA6/PP-g-MAH/POE blends are pseudo-plastic fluids. Both the POE and PP-g-MAH components can increase the apparent viscosity of the melt due to their facility of the linear molecular.
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Authors: Ming Tao Run, Qing Han, Bing Tao Xing, Meng Yao
Abstract: The phase morphology, rheology, and crystallization properties of the PA6/PP-g-MAH/POE blends prepared by melt-blending method were studied by scanning electron microscopy (SEM), capillary rheometer and differential scanning calorimetry (DSC), respectively. The results suggest that the compatibility of PA6 and POE can be improved by the compatibilizer of PP-g-MAH and the 10% of PP-g-MAH is preferred. PP-g-MAH and PA6 can both serve as nucleating agents for each other, and improve their crystallization behaviors. All melts of PA6/PP-g-MAH/POE blends are pseudo-plastic fluids, and PP-g-MAH components can increase the melt apparent viscosity due to its inherent higher viscosity, and so the processing property of the blend will be controlled in much wider temperature range.
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