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Zhang D.,Guizhou UniversityGuiyang550025 China | He M.,Guizhou UniversityGuiyang550025 China | Qin S.,Guizhou UniversityGuiyang550025 China | Yu J.,Guizhou UniversityGuiyang550025 China | And 2 more authors.
Polymer Composites | Year: 2016

Long glass fiber reinforced thermoplastic polyurethane and Poly (butylene terephthalate) (PBT) (LGFTP) composites with different ratios of TPU and PBT were prepared by using self-designed impregnation device. The dynamic mechanical, thermal, and mechanical properties of LGFTP composites were studied. Results showed that there was good compatibility between TPU and PBT. Dynamic mechanical thermal analysis (DMA) results indicated that the TPU content and scanning frequencies had some influence on dynamic mechanical properties and glass transition of LGFTP composites. In addition, the Arrhenius relationship has been used to calculate the activation energy of α-transition of the composites. Differential scanning calorimetry (DSC) analysis indicated that with increasing TPU content the crystallization temperature (Tc), the melting point (Tm), and the percent crystallinity (Xc) decreased. Both TG and DTG curves of the LGFTP composites are shifted to lower temperatures with the increasing of TPU content. Mechanical properties showed that the addition of TPU could lead to a remarkable increase tensile and notched izod impact strength with a small reduction in flexural strength and modulus of LGFTP composites. © 2016 Society of Plastics Engineers. Source


Zhang D.,National Engineering Research Center for Compounding and Modification of Polymeric MaterialsGuiyang550014 China | Qin S.,National Engineering Research Center for Compounding and Modification of Polymeric MaterialsGuiyang550014 China
Journal of Vinyl and Additive Technology | Year: 2016

Long glass fiber (LGF)-reinforced polypropylene (PP) composites were prepared using self-designed impregnation device. Effects of impregnation time on mechanical properties, crystallization, dynamic mechanical properties, and morphology of PP/LGF composites were investigated. The experiment results demonstrate that the excellent tensile strength, Notched Izod impact strength was 152.9 MPa, 31.2 KJ/m2, respectively, and the stiffness of PP/LGF composites was higher, when the impregnation time was 7.03 s. The excellent interfacial adhesion between PP and glass fiber indicates that PP/LGF composites possess the outstanding mechanical properties. The impregnation time scarcely influenced thermal properties of PP/LGF composites. J. VINYL ADDIT. TECHNOL., 2016. © 2016 Society of Plastics Engineers © 2016 Society of Plastics Engineers February 2016 10.1002/vnl.21543 Research Article Research Articles © 2016 Society of Plastics Engineers. Source


Li J.,National Engineering Research Center for Compounding and Modification of Polymeric MaterialsGuiyang550014 China | He W.,National Engineering Research Center for Compounding and Modification of Polymeric MaterialsGuiyang550014 China | Long L.,National Engineering Research Center for Compounding and Modification of Polymeric MaterialsGuiyang550014 China | Zhang K.,National Engineering Research Center for Compounding and Modification of Polymeric MaterialsGuiyang550014 China | And 4 more authors.
Journal of Vinyl and Additive Technology | Year: 2015

Inorganic silica is widely used as nucleating agents for isotactic polypropylene (iPP), and to achieve a better effect, the amount of addition is generally higher than 5 wt%. A novel silica-based nucleating agent (SPKSol) was prepared by two steps: aromatic phosphate (MDBP-POOH) was first supported on the silica sol via chemical reaction with γ-aminopropyltrimethylsilane (KH550) as the linker, and the obtained product (PKSol) was further processed by spray-drying. Fourier-transform infrared spectrometry and thermogravimetric analysis confirmed the incorporation of MDBP-POOH on the silica sol. The results demonstrated a spherical particle with an average size of 5 μm, and a slit-shaped pore structure was formed from the originally formed nano-sized particles of PKSol after the spray-drying process. Transmission electron microscopy showed that the SPKSol was well-dispersed in the iPP matrix. Incorporating a very small amount of SPKSol (0.2 wt%) can effectively increase the crystallization temperature and improve the mechanical properties of polypropylene. In addition, the addition of SPKSol could even shift the haze of polypropylene to a lower value, obviously lower than that with PKSol as the nucleating agent. The preparation, characterization of SPKSol, and their application in iPP composites were explored in detail. © 2015 Society of Plastics Engineers. Source

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