Reporter: Lin, An
Advisor: 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.
open
coles
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 .
Materials
cork granules
average particle size 0.5–1 mm
cork powder
average particle size <500 m
polypropylene (PP) homopolymer
Stearic acid
PP–g–MA
containing 0.5–1.0 wt.%
Methods
PP
Cork powder
Coupling agent
Cork granule
Methods
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 raw
Materials used.
Methods
CPC1~6,14,15 : without coupling agent
CPC7~12
: with
coupling agent
CPC13 : with stearic acid
Results and discussion
Results and discussion
.
Results and discussion
Fig4. (b) effect of the coupling agent on the composites
containing cork powder.
Results and discussion
Powder 5 wt. %
Powder 15wt. %
Powder 30wt. %
Granule 5wt. %
Granule 15wt. %
Granule 30wt. %
Results and discussion
Results and discussion
Conclusions
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-oxidative
protection.
Thermal analysis shows that PP/cork had higher crystallization temperatures than neat
PP.
Source:https://pbs.twimg.com/profile_images/417201275466690560/TzVjIXv2.jpeg
Thanks for your attention!