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Study on Polyolefine/Flax-Fiber Composites

Author: HanZhiChao
Tutor: LiuJunLong
School: Dalian University of Technology
Course: Materials Science
Keywords: flax fibers polyethylene polyvinyl chloride composites coupling agent graft blending
CLC: TB332
Type: Master's thesis
Year: 2008
Downloads: 1
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Abstract


Flax fiber was a resourceful and low-cost natural fiber. It had great significance of(polyolefine/flax) composites to make full use of flax resource and to protect environment.In this paper, polyolefine and flax fiber were selected to produce PE/flax, PVC/flaxcomposites on the basis of the principle of polymer filling and modification through thetechnique of compound mixing.Flax fiber was modified with titanate coupling agent, silane coupling agent and stearicacid. The effect of surface modifier amount on the properties of the (PE/flax) composites andthe (PVC/flax) composites was studied. The results showed that the properties of (PE/flax)composites were best after NDZ-201titanate coupling agent modified flax fiber. Theproperties of (PVC/flax) composites were best after KBC-1003silane coupling agentmodified flax fiber.In the paper, we prepared graft copolymer A(flax-g-MA) by water-phase graftcopolymerization. The graft monomer was methyl acrylate. The best technologcial conditionswas showed as follows: the quality ratio of monomer and flax was1.2. The quality ratio ofevocating agent and monomer was0.12. The reaction temperature and time were60℃and4h.The structure of graft was charactered by FT-IR spectra and the graft was final objective product.The influence of two modified methods on mechanical properties of composites wasinvestigated. The results showed that the mechanical properties of composites with graftingmodification flax fiber were better than that of with coupling agent modification flax fiber.The mechanical properties of composites containing graft C were the best in the all. Theimpact strength, tensile strength and flexural strength of (PE/flax) composites were increasedby71%,25%and81%. The impact strength, tensile strength and flexural strength of(PVC/flax) composites were increased by105%,122%and171%.Physical property and processability of composites were discussed. When flax fiber wasmodified with surface modifier, the density was not improved, and then hydrolytic resistanceand processability were heightened. The density was not enhanced, while hydrolyticresistance and processability were increased greatly by grafting modification flax fiber. SEM showed that the compatibility of composites was advanced by graftingmodification and surface modification.

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
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