| Summary: | 碩士 === 國立交通大學 === 機械工程系所 === 97 === The plastic productions are usually used just for several weeks to several years, but their degradable time is a very long time, about 900 years. The kind of productions will make largely bad effects on the environment. Lately, finite resources such as oil and minerals, became fewer and fewer, and the price of materials went up and down. More studies will be done about bio-material and bio-energy as more and more attention is paid to them. The purpose of this study is to reinforce the properties of bio-material. Therefore, the bio-material can be applied more generally. This study will blend the bio-material, polylactic acid(PLA), with kenaf fibers, respectively, and montmorillonite(MMT). After that, when PLA and the compositions make injection molding, I will control the mold temperature in the compacting stage. Then, surveying mechanical properties of the molded samples and discussing effects of the superstructure.
According to the study result： PLA in the compacting stage needs a long time at high temperature to generate superstructure. If the superstructure is not highly concentrated enough, it will not reinforce the tensile strength of PLA. About the PLA samples with blending reinforcement, their tensile strength is lower than the PLA samples. Because of that, decentralization of reinforcement was not achieved. Furthermore, a long period of time at high temperature with shear effect in the blending machine caused the degradation and molecular weight decrease of PLA.
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