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Determination of processing parameters of photostability for polyvinyl chloride rice husk composites

Mohd Jais, Farhana Hazwanee (2017) Determination of processing parameters of photostability for polyvinyl chloride rice husk composites. Masters thesis, Universiti Tun Hussein Onn Malaysia.

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Abstract

The effects of natural weathering on the physical and mechanical properties of Wood Polymer Composites (WPCs) of polyvinyl chloride (PVC)/rice husk (RH) were investigated. The PVC and RH flour were then prepared based on the fixed addition of 50 % RH, 40 % PVC thermoplastic and 10 % additives such as Titanium Dioxide (TiO2), plasticizer, calcium zinc stabilizer and polyethylene wax. WPCs pellets were fabricated using a twin-screw extruder. Then, WPCs pellets obtained were exposed to an artificial UV weathering to stimulate a long-term outdoor exposure up to 5000 hours. After this weathering stage, the WPCs pellets were characterized for SEM (Scanning Electron Microscope), tested for Tensile Strength and DMA (Dynamic Mechanical Analysis) in order to understand the material physical degradation. The tensile test assessed revealed that the strength maintained at prolonged UV irradiation exposure with 43.70 MPa with maximum strain of 3.82 %. The longer UV irradiation exposure, the tensile strength was reduced with 6.9 % while the strain was decreased with 15 %. This is due to WPCs doped with Ultraviolet stabilizer during pre-mixing to improve colour stability and material strength. DMA revealed the behaviour of the WPCs which showing result of cross linked density of unirradiated WPCs correlated to tensile strength at initial value of 10.7179 x 10^3 M/m3. Meanwhile the tensile strength and cross linked density of irradiated WPCs was observed at 43.33 MPa and 10.0968 x 10^3 M/m3 respectively. Tensile strength property with the effective crosslink density of polymeric composite shows upon ultra-violet exposure of WPCs and seen to follow trend of tensile strength and cross linked density.

Item Type: Thesis (Masters)
Subjects: T Technology > TP Chemical technology > TP1080-1185 Polymers and polymer manufacture
Depositing User: Mr. Mohammad Shaifulrip Ithnin
Date Deposited: 02 May 2018 08:52
Last Modified: 02 May 2018 08:52
URI: http://eprints.uthm.edu.my/id/eprint/9987
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