reporter: lin, an advisor: chen, chuh-yean date: 6/11
TRANSCRIPT
Reporter: Lin, AnAdvisor: Chen, Chuh-Yean
Date: 6/11
Introduction
Polypropylene (PP) is a thermoplastic being widely applied in the industry and is usually combined with inorganic particles or fibres aiming to improve its mechanical properties and reduce cost.
Cork is a natural and complex polymeric composite material. Furthermore,cork is closed cell structure, viscoelastic properties, insulation properties, is chemically inert, fire resistance, microbial decay resistance.
Polypropylene graft maleic anhydride (PP–g–MA)can overcome the problem of incompatibility, increasing the interfacial adhesion between both components and, the mechanical performance of the composites .
colesopen
cork granules
Materials
cork powder
polypropylene (PP) homopolymer
PP–g–MA
Stearic acid
average particle size 0.5–1 mm
average particle size <500 m
containing 0.5–1.0 wt.%
Coupling agent
Methods
PP Cork powder
Cork granule
Fig. 2. Representative micrographs from: (a) cork powder and (b) granulated cork. Image (c) shows the differences (for same weight) in volume between the three rawMaterials used.
Methods
CPC1~6,14,15 : without coupling agent
CPC7~12 : with coupling agent
Methods
CPC13 : with stearic acid
Results and discussion
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Results and discussion
Fig4. (b) effect of the coupling agent on the composites containing cork powder.
Results and discussion
Results and discussion
Powder 5 wt. %Powder 15wt. %Powder 30wt. %Granule 5wt. %Granule 15wt. %Granule 30wt. %
Results and discussion
Results and discussion
The PP/cork composites exhibit reduced water uptake. The higher cork fraction, increases the water absorption up to 2.3 wt.% after a period of 1344 h.
The tensile properties reveal that a 5 wt.% of cork provide a 10% stiffness increase. The addition of PP–g–MA enhanced the tensile strength and maximum strain, while the stearic acid promoted a slight increase on the maximum strain.
Cork has an antioxidant effect to the PP, increasing the time to oxidation. Reducing the cork particle size and the composite density, contributes to a higher thermal-oxidativeprotection.
Thermal analysis shows that PP/cork had higher crystallization temperatures than neat PP.
Conclusions
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