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Jiang X.-W.,Donghua University | Yin N.-W.,Shanghai Kingfa Science and Technology Co. | Ji J.-L.,Shanghai Kingfa Science and Technology Co. | Xu H.-Y.,Donghua University
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2010

Nano-CaCO3/polypropylene (PP), polyethylene terephthalate (PET) fibers/PP and nano-CaCO3/PET fibers/PP composites were prepared and their structure and mechanical properties were investigated. The results show that the nano-CaCO3/PET fibers/PP three-phase composites displays significantly improved mechanical properties compared with PET fibers/PP and nano-CaCO3/PP composites. The reinforcement mechanism was investigated by X-ray diffraction (XRD), Dynamic Mechanical Analysis (DMA) and Scanning Electron Microscope (SEM). The results indicate that the interfacial action and compatibility between PET fiber and PP are obviously enhanced by the addition of nano-CaCO3 particles in the three-phase composites and the mechanical properties enhancement is originated from the formation of β-form crystallites of PP, which is induced by the synergistic effect between PET fibers and nano-CaCO3. Source

Li B.,Shanghai JiaoTong University | Wan C.,Shanghai JiaoTong University | Zhang Y.,Shanghai JiaoTong University | Ji J.,Shanghai Kingfa Science and Technology Co. | Su Y.,Shanghai Kingfa Science and Technology Co.
Polymers and Polymer Composites | Year: 2010

Poly(2,6-dimethyl-1,4-phenylene oxide)/polyamide 6 (PPO/PA6) blends were reactively compatibilized by maleic anhydride (MA) grafted PPO (PPO-g-MA) and toughened by MA grafted styrene-ethylene-butadiene-styrene block copolymer (SEBS) (SEBS-g-MA) via melt extrusion. The compatibilizing effect of PPO-g-MA on the PPO/PA6 blends was studied by using scanning electronic microscopy, differential scanning calorimetry and mechanical properties tests. The notched impact strength of PPO-g-MA/PPO/PA6/SEBS-g-MA blends increased with increasing SEBS-g-MA content, leading to blends having super-tough behaviour. The fracture behaviour of the PPO/PA6 blends was studied using a modified essential work of fracture model (EWF), which showed that plastic deformation related to SEBS-g-MA was the crucial factor for the toughening. Source

Wen X.,Northeastern University China | Yi Q.,Kingfa Science and Technology Co. | Yi Q.,Shanghai Kingfa Science and Technology Co. | Mai J.,Kingfa Science and Technology Co. | And 2 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2014

The isothermal and non-isothermal crystallization kinetics of poly(decamethylene terephthalamide) (PA10T) were investigated by differential scanning calorimetry. The isothermal crystallization kinetics was described by Avrami equation. The two-dimensional growth and homogeneous nucleation during the crystallization of PA10T was discovered. The Avrami exponent is 2.0 for PA10T, and the activation energy is 302.32 kJ/mol. The non-isothermal crystallization kinetics of PA10T were studied. It was found that with the increase of cooling rate, the crystallization peak temperature decreases, the crystallinity and crystallization enthalpy increase and the crystallization rate is dramatically promoted. The non-isothermal crystallization kinetics was analyzed by Mo equation. The results show that the constant α is kept at 1.6 and the activation energy is 338.56 kJ/mol. Source

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