Status : Verified
| Personal Name | Tilendo, Amierson C. |
|---|---|
| Resource Title | Development of geothermal scale powder and unsaturated polyester resin for stereolithography application |
| Date Issued | 5 June 2017 |
| Abstract | Geothermal scale powder (GSP), a waste generated from geothermal power plants, was investigated as a filler to improve material properties of stereolithography (SLA) resin. Simultaneously, low cost unsaturated polyester (UP) resin characterized with excellent mechanical properties was employed for photopolymerization. The addition of GSP to neat SLA resin enhanced the flexural modulus by 22% and Shore D hardness by 4%; however, poor dispersion and agglomeration of GSP in the matrix reduced the flexural strength by 10%. Hence, GSP was surface-modified with surfactants, such as stearic acid (SA) and glycerol monostearate (GMS), and silane coupling agent 3-trimethoxysilylpropyl methacrylate (TSPM). Flexural modulus and Shore D hardness of SLA resin were improved by 73% and 13%, respectively, with the addition of GSP modified with 3 wt% TSPM, while flexural strength decreased by 23% due to inefficient reaction of TSPM. Development of UV-cured UP resin showed maximum cure depth at optimal photoinitiator loading of 1 wt% benzil. Addition of co-initiators such as cocamide monoethanolamine (CMEA) enhanced the average cure depth by 5%, while cocamide diethanolamine (CDEA) shifted the optimal photoinitiator loading to 0.5 wt% benzil and enhanced the average cure depth by 15%. Addition of CMEA or CDEA also improved the hydrophobicity of UV-cured UP resin by 12%. Standard design equation for stereolithographic parameters was also employed to assess and optimize the reactivity of UV-curable UP resin. Essentially, flexural properties and hardness of optimized UV cured UP resin were significantly higher than commercial SLA resin. Finally, 120% increase in flexural modulus, 7% increase in flexural strength and 20% increase in hardness was obtained with TSPM-modified GSP/UP resin composite. |
| Degree Course | Master of Science in Chemical Engineering |
| Language | English |
| Keyword | Geothermal scale powder; Unsaturated polyester resin; Stereolithography application |
| Material Type | Thesis/Dissertation |
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Category : I - Has patentable or registrable invention of creation.
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