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Surface Grafting and Hybrid of Fir Powder and Their Effects on the Mechanical Properties of Polypropylene Composites

Author: WuJianLi
Tutor: ShiTieJun
School: Hefei University of Technology
Course: Materials Science
Keywords: fir powder TDI octanol nanosilica PP composites
CLC: TQ325.14
Type: Master's thesis
Year: 2010
Downloads: 52
Quote: 3
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Abstract


In this thesis,fir powder was modified by hybrid and grafting,then their effects on mechanical properties of polypropylene(PP) composites were investigated.The main results are shown as follows:(1) Fir powder was treated with 18 wt% NaOH solution. The structure and property of fir powder were analyzed by FTIR, XRD, TGA and SEM. The results showed that after treatment,there was no vibration absorption peak of the C=O bonds at 1732cm-1of fir powder , which means that the fattiness kind of small molecule compounds of fir powder were removed. The pit of fir powder were clear. The hydrogen-bonds and the crystal structure of lignocelluloses were broken partly.(2) The surface of fir powder was modified by Toluene diisocyanate(TDI), its application in PP composite materials was investigated. The results showed that weight percent gain of modified fir powder can up to 20.5%.Mechanical properties of the PP composites increased obviously,tensile and impact strength of PP composites filled with modified fir powder were increased about 42.5% and 59.6%.(3) SiO2/fir powder hybrid materials were prepared using TDI as coupling agent, then PP composites was prepared by blend of the hybrid materials and PP.The structure of the materials were analyzed by FTIR,TEM,XRD and SEM. The results showed that nanosilicas increased roughness of the wood surface and enhanced interface force between the hybrid materials and PP. The hybrid materials improved impact strength and tensile strength of PP Composites.(4) Octanol was grafted onto fir powder using TDI as coupling agent, its application in PP composite materials was investigated. Graft yield of fir powder was 5%. Tensile and impact strength of PP composites filled with grafted fir powder were increased about 44.3% and 79.9%.SEM examination revealed grafted fir powder have good dispersion in PP.

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CLC: > Industrial Technology > Chemical Industry > Synthetic resins and plastics industry > Polymer resin and plastic > Polyolefin plastic > Polypropylene
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