The study of preparing PLA nanocomposites
碩士 === 崑山科技大學 === 材料工程研究所 === 99 === PLA are used as biomedical materials because they are biodegradable, but the vast majority of biodegradable polymers in clinical use are composed of rather stiff materials that exhibit limited extendibility, weak mechanical strength and poor thermal stability, th...
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| Format: | Others |
| Language: | zh-TW |
| Published: |
2011
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| Online Access: | http://ndltd.ncl.edu.tw/handle/18611902834460128091 |
| Summary: | 碩士 === 崑山科技大學 === 材料工程研究所 === 99 === PLA are used as biomedical materials because they are biodegradable, but the vast majority of biodegradable polymers in clinical use are composed of rather stiff materials that exhibit limited extendibility, weak mechanical strength and poor thermal stability, they are unsuitable for use in numerous applications. We modified PLA with 2-methacryloyloxy- ethyl isocyanate (MOI) to prepare ductile PLA materials. By utilizing the sol-gel process, novel PLA nanocomposites were further prepared with improved thermal stability and mechanical properties. The 10% thermal decomposition temperature for PLA modified with 5% MOI and contained 5-10% silica is 31-36oC higher than that of original pristine PLA. Elongation at break increases by 5-14 times when compared to neat PLA, while the tensile strength maintained at 30-40 MPa. These synthesized PLA nanocomposites can be applied as biomaterials with better mechanical and thermal properties.
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