Thermal Absorption Properties Of Spent Tea Leaf Filled Polyurethane Composite Material

Siti Aisyah, Safuan (2013) Thermal Absorption Properties Of Spent Tea Leaf Filled Polyurethane Composite Material. Project Report. UTeM, Melaka, Malaysia. (Submitted)

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Abstract

Energy conservation is an increasingly important issue in the residential sector. Therefore, attention towards the thermal performance of building materials, particularly thermal insulation systems for building has grown in recent years. This report describes the thermal absorption behavior of polyurethane composites reinforced with different grades of spent tea leaves (STL) fibers at various fibers loading. The objectives of this study were to characterize the spent tea leave fibers in terms of its physical, chemical, and thermal properties as well as the rate of heat transfer of the spent tea leaves filled polyurethane (PU/STL) composite at various temperatures (i.e. 50, 70. 90, and 110°C). There were three grades of STL fibers, which are BM-FAE and SW-BHE obtained from the stalk while Fiber-FAE extracted from the leave of a tea plant. The PU/STL composite was fabricated via granulation and open molding with fiber loading ranging from 5, 10, 15, and 20% wt%. Results showed that BM-FAE has the lowest density, 1.441g/cm3 as it comes from the stalk. These three grades of fiber have showed the presence of lignin at the wavenumber range between 1650 cm-1 and 1380 cm-1 from FTIR. For the glass transition temperature (Tg) of fibers, the value was in between 70°C and 80°C. In terms of thermal absorption behavior, it was observed that at temperature 70°C (Tg of composite), PU/BM-FAE composite showed lower heat absorption than other composites due to the porous media in fiber. It was also perceived that the addition of fiber loading reduced the heat absorption of the composite. Above the Tg of composite (90 and 110°C), the rate of heat transfer becomes higher due to the phase change of the polyurethane.

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