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Jiang M.,Wuhan University of Technology | He L.,National Engineering Research Center for Compounding | Gong W.,National Engineering Research Center for Compounding | Dong L.,Wuhan University of Technology | And 2 more authors.
Polymer - Plastics Technology and Engineering | Year: 2012

The polymer foam quality was enhanced significantly by modifying the structural and decomposition characteristics of chemical blowing agent (CBA), including the basic particle size, compatibility with the polymer matrix and gas yield. The submicrometer semicarbazide-covalently anchored polystyrene (SCPS) particles were synthesized and utilized as a blowing agent for polystyrene foaming. The results demonstrated the decreased basic particle size, enhanced dispersion and modified decomposition characteristic of SCPS improved significantly the foam quality. The SCPS having homogeneous size distribution and good compatibility with the polymer matrix contributed to the uniform dispersion of CBA and thus confined cell coarsening. © 2012 Copyright Taylor and Francis Group, LLC. Source


Qin J.,Guizhou University | Qin J.,National Engineering Research Center for Compounding | Chen X.,Southwest Jiaotong University | Yu J.,National Engineering Research Center for Compounding | And 4 more authors.
Polymers and Polymer Composites | Year: 2012

High-density polyethylene (HDPE)/Mg2Al-layered double hydroxide (Mg2Al-LDH) nanocomposites with an ethylene-acrylic acid random copolymer (EAA)/Mg2Al-LDH master batch were prepared by melt-mixing. The structure of the nanocomposites was characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results demonstrate the formation of the nanocomposites with exfoliated/intercalated layered double hydroxides well distributed in the HDPE matrix. The nonisothermal crystallization behaviour of master batch-based HDPE nanocomposites was studied by using differential scanning calorimetry (DSC). The crystallization behaviour of HDPE/Mg2Al-LDH nanocomposites was well defined by the Avrami analysis and Jeziorny method, as well as the combined Avrami and Ozawa analysis (MO's model). The results reveal that a very small amount of Mg 2Al-LDH (1%) accelerates the crystallization process in comparison with the neat HDPE, and the high crystallization rate is attributed to the nucleating effect of the exfoliated nanoparticles. Overall, the exfoliated Mg2Al-LDH particles act as the nucleating agent, and therefore distinctly change the type of nucleation, growth and geometry of HDPE crystals. © Smithers Rapra Technology, 2012. Source


Liu Z.Y.,Guizhou University | Liu Z.Y.,National Engineering Research Center for Compounding | Xiong Y.Z.,Guizhou University | Xiong Y.Z.,National Engineering Research Center for Compounding | And 4 more authors.
Advanced Materials Research | Year: 2013

(POE-g-MAH/OMMT) and (POE-g-MAH/SiO2) toughening particles of core-shell structure were prepared by ball grinding method and were used to modify toughness of PA6.The morphology of PA6 modified by these core-shell particles were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM),and were detected by mechanical performance test. The results show that both toughening particles could improved notch impact strength of PA6,and with toughening particle exceed 10%, composites notch impact strength is rapid increase.(POE-g-MAH/OMMT) particle of PA6 toughening effect is better than (POE-g-MAH/SiO2).When material under impact, OMMT produced slip effect in core-shell structure and SiO2 produced rolling effect. © (2013) Trans Tech Publications, Switzerland. Source


Chen X.,Southwest Jiaotong University | Yu J.,National Engineering Research Center for Compounding | Qin J.,Key Laboratory of Karst Environment and Geohazard Prevention GuizhouUniversity | Luo Z.,National Engineering Research Center for Compounding | And 3 more authors.
Polymers and Polymer Composites | Year: 2011

In this paper, the limiting oxygen index (LOI), Underwriters' Laboratories-94 (UL-94) test, cone calorimeter test (CCT), and thermogravimetric analysis (TGA) were used to study the flame-retardant properties of polypropylene (PP) composites and the synergistic flame-retardant effects of zinc borate (ZB) and/or microencapsulated red phosphorus (MRP) with modified magnesium hydroxide (MH) on PP. The experimental results showed that the addition of ZB and MRP had a great effect on the flammability of the PP composites. The data obtained from the CCT indicated that the heat release rate (HRR), the effective heat of combustion (EHC), and the mass loss of the flame-retarded PP composites decreased markedly with increasing addition of ZB and/or MRP. The data obtained from the TGA curves indicated that the thermal stabilities of PP/MH/ZB and PP/MH/ZB/MRP composites were better than those of PP/MH composites. ©, 2011 Smithers Rapra Technology. Source


Yan W.,National Engineering Research Center for Compounding | Yan W.,Guiyang University | Qin S.,National Engineering Research Center for Compounding | Guo J.,National Engineering Research Center for Compounding | And 4 more authors.
E-Polymers | Year: 2012

In this article, polyamide 6(PA6)/organoclay masterbatch were prepared by melt mixing, and then acrylonitrile-butadiene-styrene(ABS)/polyamide 6(PA6)(70/30,w/w) nanocomposites were prepared by the melt mixing of PA6, ABS and organoclay. The effect of organoclay platelets on morphology and mechanical properties of ABS/PA6/organoclay ternary nanocomposites had been investigated by wide angle X-ray diffraction (WAXD) and transmission electron microscopy (TEM), scanning electron microscopy (SEM) and mechanical properties testing. Morphology analysis revealed that organoclay platelets were selectively dispersed and exfoliated in PA6 phase, but some were located in interface of PA6 and ABS phase. The droplet size of PA6 dispersed phase were gradually reduced less than 4 phr organoclay, then the dispersed domain size became unchanged with the addition of various organoclay. It suggested the organoclay can compatibilize the ABS/PA6 blend nanocomposite. Moreover, the flexural strength and modulus increase with increasing organoclay content, but the tensile strength became maximal at 3 phr organoclay. The organoclay has no effect on impact strength of ABS/PA6 blend nanocomposite. Source

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