Che Mohamad, Fatimah Zaharah (2007) Performance of recycled high density polyethylene (HDPE)/ rice husk composite injection grade in thermoforming process. Other thesis, Universiti Teknologi Malaysia.
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All thermoplastic polymers can be remelted and recompounded into a new grade, but the presence of certain additives, blends, or fillers like glass fibers may limit the application area of the recyclate. In this present study, it was my aim to investigate the ability of recycled rice husk-filled-high density polyethylene (RHPE)composite injection grade to be processed using thermoforming technique. Various recycled RHPE composite injection grade, that is with composition 30%, 40% and 50% of rice husk were investigated in this study. These composites were first grinded to a fine form using laboratory grinder machine before being melt-blended and milled into sheets on a two-roll mill. Then, test specimens were prepared to study on the mechanical properties that is tearing test and tensile test. The results showed the tear and tensile strength were reduced significantly with the percentage increase of rice husk contents. However, the Young modulus had increased. The MFI of the recycled RHPE was determined to find its suitability in terms of flow behaviour and compared to standard MFI for thermoform grade. MFI was found to decrease as compared to the virgin HDPE, but is within the standard MFI for thermoforming material grade. FTIR spectroscopy and DSC thermal analysis used to characterize the recycled composite materials. FTIR analysis indicates that the major chemical structure of rice husk filled in HDPE samples is not affected by recycling process and also shows the rice husk contents was not undergo degradation during the injection moulding process. While, melting temperature does not differ much from the pure RHPE therefore recycled RHPE does not undergo much thermal degradation. So, these shows the ability of recycled RHPE composite can be reprocessed for other usage. Recycled RHPE composites containing 40% rice husk exhibit good properties and showed high capability to be thermoformed.
|Item Type:||Thesis (Other)|
|Subjects:||T Technology > TP Chemical technology|
|Divisions:||Chemical and Natural Resources Engineering (Formerly known)|
|Deposited By:||Dr Abdul Razak Rahmat|
|Deposited On:||11 Jun 2007 06:56|
|Last Modified:||02 Oct 2012 06:05|
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