BUKU ABSTRAK - Universiti Putra Malaysia

Irradiated and Crosslinked Ethylene Vinyl Acetate/Waste Tire Dust (EVA/WTD)
Blend
Assoc. Prof. Dr. Luqman Chuah Abdullah
Z. A. Anis Sakinah, C. T. Ratnam and Thomas S. Y. Choong
Institute of Tropical Forestry and Forest Products, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6288; chuah@eng.upm.edu.my
Keywords: Ethylene vinyl acetate, mixing condition, waste tire dust
Palm Oil based Polyurethene Building Materials having Phase Change Material
(PCM)
Assoc. Prof. Dr. Luqman Chuah Abdullah
Rozanna D., Salmiah A. and Thomas S. Y. Choong
Institute of Tropical Forestry and Forest Products, University Putra Malaysia,
43400 UPM Serdang, Selangor, Malaysia.
+603-8946 6288; chuah@eng.upm.edu.my
251
Science, Technology & Engineering
Tires are among the largest and most problematic sources of waste, due to the large volume produced and
their durability. Those same characteristics that make waste tires such a problem also make them one of the
most re-used waste materials, as the rubber is very resilient and can be re-used in other products. Ethylene-vinyl
acetate (EVA) copolymers offer excellent ozone resistance, weather resistance and mechanical properties. Blends
of natural rubber and ethylene-vinyl acetate copolymer are very attractive because of the excellent properties of
both constituents. The addition of natural rubber to EVA increases the melt elasticity of the system. In addition,
the presences of EVA in higher proportions increase the thermal ageing resistance of EVA/WTD blends. Increase
in irradiation doses increased the percentage of gel content in EVA/WTD blends. Mechanical properties of
EVA/WTD increase with the introduction of irradiation except for elongation at break. Irradiation enhances the
crosslink density but increases the blend stiffness. The presence of crosslinking agents will further accelerate
the irradiation-induced crosslinking in which help to achieve optimum tensile strength at lower irradiation dose.
This invention mainly focusses on palm oil based PCMs, such as organic fatty acids, impregnated with
PU roofing boards, which possess superior properties over other class of PCMs, such as suitable phase change
temperature, non-toxicity, high latent heat density, ready availability, small volume change and good thermal
reliability after a large number of heating-cooling cycles. The main aim of this invention is to conserve energy
in buildings, where the heat collected during bright sunshine can be preserved and stored and later released at
night in solar energy systems. Thus, the product is applicable as heat storage material. Palm oil based PCMs use
chemical bonds to store and release energy and the thermal transport occurs through phase change. The advantage
is that, they store 5-14 times more heat compared to other conventional storage materials. Fatty acids are more
desirable for solar application due to its lower cost and can be continuously obtained at non-pollutant source of
supply.
Keywords: Phase change materials (PCMs), thermal characteristic, eutectic mixtures, DSC, melting point, latent heat,
passive solar building