| Summary: | 碩士 === 義守大學 === 生物技術與化學工程研究所 === 102 === This research includes three major parts. The first part of the research is to copolymerize methyl methacrylate with three different monomers, which are dipropylene glycol mono-methyl ether acrylate(DOBA), propylene glycol mono-methyl ether acrylate(OBA1) and its isomers, OBA2, through the method of solution polymerization with different proportions, aollowing by the investigation of the thermal stability and the optical properties of the copolymers. The results turn out that compared with PMMA, the copolymers have an enhancement in thermal stability and better potentiality in toughness enhancement.
The second part of the research is to prepare nanocomposites, POBA1/clay, POBA2/clay and PDOBA/clay. We added different proportions of modified clay into monomers of OBA1, OBA2 and DOBA. Then, we synthesized nanocomposites, POBA1/clay, POBA2/clay and PDOBA/clay by miniemulsion polymerization, and conduct investigation of their structure, thermal stability. The results show that the nanocomposites we made are intercalated nanocomposites with partially-exfoliated structure, which have a great improvement in their thermal stability.
All in all, PMMA has the best optical property of all plastics. It not only excels in weatherability, but also has a wide range of application. However, PMMA is brittle, which makes its impact resistance unideal. Therefore, the third part of the research is to produce particle toughened PMMA to improve its impact resistance. In the experiments, we prepare particles of POBA1, POBA2 and PDOBA by emulsifier-free emulsion polymerization. Then, by the method of mass polymerization, we scatter different proportion of those particles onto the monomers of MMA to create particle toughened PMMA and test the thermal stability, mechanical properties and other characteristics of the particle toughened PMMA. The result shows that the particle toughened PMMA we create have an enhancement in toughness and further increase its thermal stability.
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