| Summary: | 碩士 === 國立臺北科技大學 === 分子科學與工程系有機高分子碩士班 === 106 === In this study, polylactic acid (PLA) / Polycaprolactone (PCL) was added into the composites according to different proportions. The composites were prepared by double-screw kneading method, and the composite materials were analyzed. We analyze the mechanical properties(such as Melt index, tensile stress, tensile strain)decomposability and thermal properties.
From experiments, it was found that the melt index of the composite material decreases with the increase of the additive concentration, and the elongation and tensile strain of the composite material increase. And explore the differences in the molecular weight and decomposability tests. In the study, the glass transition temperature (Tg) and thermal cracking temperature (Td) of different PLA and PLA/PCL were also investigated by thermal analyzer (DSC and TGA). As a result of the experiment, it was found that the decomposability of the composite material increased as the additive amount increased. As for the oxygen transmission rate (OTR) of PLA composites and PLA-PCL composites, the barrier efficiency will decrease with the increase of the proportion of PCL； from DSC, it is known that PLA adds different proportions of PCL, with the proportion of PCL increasing, the glass The transfer temperature shifts from low to high glass transition temperature, which shows that PLA and PCL have good compatibility in the amorphous area and enhance the strength of the object； the mixing ratio of polylactic acid/polycaprolactone was also found in this study. It is 80/20, and the additive has a flexibility of 1.0%, biodegradability and mechanical properties.
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