| 中文摘要 |
本研究以溶液混合法將石墨烯（GNS, graphene sheet）添加於聚乳酸（Polylactic Acid）中製備複合材料，探討GNS含量對於PLA的熱性質（thermal properties）、結晶行為、抗拉性質（tensile properties）與阻水性質（water vapor barrier）的影響。添加0.1～10wt％ GNS於PLA內，由結果顯示，複合材料之熱裂解溫度（Td）隨著GNS含量增加至3wt％達最高點（367℃），比純PLA提高了13℃，含5與10wt％ GNS複合材料與3wt％具相同之Td點。複合材料的玻璃轉移溫度（Tg）與純PLA幾乎相同，複合材料之Tm1與Tm2除了含10wt％ GNS外大致與純PLA相同。在拉伸性質方面，複合材料之抗張強度（TS）與彈性模數（E）皆隨著GNS含量增加至0.5wt％ GNS達最大值，然後隨著GNS含量增加至10wt％而下降。與純PLA比較，含0.5wt％ GNS複合材料具有最高的抗張強度與彈性模數，分別提高了10.7％與31.3％。複合材料之水氣透過率（water vapor transmission rate, WVTR）皆比純PLA低，含5wt％ GNS複合材料水氣透過率比純PLA降低了74.5％。複合材料之接觸角隨著GNS含量增加而提高，表示石墨烯的添加提高了聚乳酸複合材料的親油性。 |
| 英文摘要 |
Composites were produced by solution mixing polylactic acid (PLA) with graphene sheets (GNS). The objective of this study is to investigate the effect of GNS content on the thermal stability, crystallization behavior, tensile properties and water barrier property of PLA. The temperature of maximum decomposition rate (Td) of the PLA / GNS composites continuously increased with increasing GNS content to 3 wt%. The value of Td for composite with 3 wt% GNS can be raised by 13℃. The composites have good thermal stability while preserving the glass transition (Tg). The values of Tm1 and Tm2 of composites were comparable to those of neat PLA except for the composite with 10 wt% GNS. The tensile strength (TS) and Young’s modulus (E) of the composites increased with the GNS content from 0.1 wt% to 0.5 wt%, and then decreased as the content of GNS reached 10 wt%. The composite with 0.5 wt% GNS exhibited the maximum values of tensile strength and Young’s modulus, and the increased percentages were 10.7% and 31.3%, respectively, compared with neat PLA. The water vapor transmission rate (WVTR) of the composites was always lower than that of neat PLA. The composite with 5 wt% GNS had the minimum value of WVTR and showed a 74.5% decrease. The composites generally exhibited higher contact angles than that of neat PLA indicating the hydrophobicity of PLA was increased by the addition of graphene. |
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