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Zhang J.,National Engineering Research Center for Compounding and Modification Polymeric Materials | Wang L.,National Engineering Research Center for Compounding and Modification Polymeric Materials | Zang C.,National Engineering Research Center for Compounding and Modification Polymeric Materials | He L.,National Engineering Research Center for Compounding and Modification Polymeric Materials | And 4 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2014

Foamed natural rubber (NR)/ethylene-vinyl acetate copolymer (EVA) composites were prepared by molding technology. According to the consistency and the mechanism of match between curing and blowing of the composites, the influence of EVA content on foaming quality and properties of foamed NR/EVA composites was studied. The results show that with the increase of EVA content from 0 phr to 20 phr, th e cell size and the cell size distribution increase at first, and then reduce; th e cell density decreases first and then increases. When adding 20 phr EVA, foaming effect is perfect for foamed NR/EVA composites, such as the cell size of 97 μm, the cell size distribution of 23.2 μm, and the cell density of 6.8×106 cm-3. When the EVA content exceeds 20 phr, the cell size and the cell size distribution increase; the cell density decreases. The shore hardness, impact resilience, hot compression set exhibit a small proportion reduction with the increasing of EVA content. When EVA content is 20 phr, mechanics properties of foamed NR/EVA composites are ideal. Source


Gong W.,Guizhou Normal University | Gong W.,National Engineering Research Center for Compounding and Modification Polymeric Materials | Gong W.,Shanghai Institute of Technology | Liu K.J.,Shanghai Institute of Technology | And 3 more authors.
International Polymer Processing | Year: 2012

Microcellular foamed polypropylene (PP)/SiO 2 composites were prepared by using micro-SiO 2 and nano-SiO 2 particles. The effects of the particle size of SiO 2 on the foaming behavior and mechanical properties of the composites were studied based on heterogeneous nucleation theory. The results showed that the silica facilitated the cell nucleation to some extent. The average cell size of 16.3 lm and the cell density of 4.46 × 10 7 cells/cm 3 were achieved for the composite foam at the silica content of 4 wt.%. The plastic deformation of the PP was strongly constrained due to the presence of the nano-silica. The tensile and impact strength of the nano-SiO 2 composite foam are larger than those of the micro-SiO2 composite foam due to the high crack propagation resistance in the microcellular PP/nano-SiO 2 composite. © Carl Hanser Verlag GmbH & Co. KG. Source


Gong W.,Chongqing University | Gong W.,Guizhou Normal University | Gong W.,National Engineering Research Center for Compounding and Modification Polymeric Materials | Gao J.,Chongqing University | And 4 more authors.
Journal of Applied Polymer Science | Year: 2011

Microcellular polypropylene (PP) was prepared through chemical microcellular injection under different processing parameters. The effects of cell structure parameters on the mechanical properties of PP materials were analyzed by the microsphere model. The results show that the mechanical properties of microcellular PP with a smaller cell size and more uniform size distribution were enhanced. The relationship between the mechanical properties and cell structure parameters correlated well with the theoretical model. Copyright © 2010 Wiley Periodicals, Inc. Source


Gao P.,Guizhou University | Gao P.,National Engineering Research Center for Compounding and Modification Polymeric Materials | Wang L.,National Engineering Research Center for Compounding and Modification Polymeric Materials | Jiang T.,National Engineering Research Center for Compounding and Modification Polymeric Materials | And 4 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2016

The polypropylene/polypropylene grafted maleic anhydride/epoxy (PP/PP-g-MAH/EP) microcellular foam composites were prepared by chemical foaming method. This study focused on effects of the EP powder content on the foaming behaviors and mechanical properties. The results indicate that EP powder acts as heterogeneous nucleation in the foaming process. Meanwhile it can also react with PP-g-MAH, formed a cross-linked structure, and thus improving the melt strength of composites. As a result, the cell structures are significantly improved. With the increase of EP content, the tensile strength, flexural strength and impact strength of microcellular foam materials increase to the maximum and then followed by decrease. With the addition of 5% EP, the composites obtain the minimum cell size, the highest cell density, and the most homogeneous distribution of cells as well as the highest impact strength. With the addition of 1% EP, the composites have the maximum tensile strength and flexural strength, and the mechanical properties are the best. © 2016, Editorial Board of Polymer Materials Science & Engineering. All right reserved. Source


Duan H.,Guizhou Normal University | Duan H.,National Engineering Research Center for Compounding and Modification Polymeric Materials | Wang C.,Guizhou University | Wang L.,National Engineering Research Center for Compounding and Modification Polymeric Materials | And 5 more authors.
Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric Materials Science and Engineering | Year: 2016

Polypropylene (PP) reinforced composites with three different fibers, such as carbon fiber (CF), glass fiber (GF), aramid fibers (AF), were prepared by banburying and then foamed by injection molding method. The effects of different fibers on mechanical properties of microcellular foams were investigated. The results indicate that PP/CF shows the best comprehensive mechanical properties among three fiber reinforced foams, whereas PP/AF exhibits the best toughness. Compared with PP microcellular foams, the tensile, compressive, and flexural strength of the PP/CF increase by 100.9%, 80.4%, and 126.5%, respectively while the toughness of PP/AF increases by 151.2%. In addition, the cell diameter, cell density, and cell size distribution of PP/CF composite are 28.97 μm, 8.58×106 cm-3, and 9.22 μm, respectively, which exhibit the best cell structure parameter among fiber reinforced foams. © 2016, Editorial Board of Polymer Materials Science & Engineering. All right reserved. Source

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