為降低塑膠廢棄物的產生，此研究開發疏水環保的聚乙烯醇(Polyvinyl Alcohol, PVA)薄膜材料以取代市售之封口膜和吸管。本研究添加無毒且可生物降解之奈米纖維素(Cellulose Nanocrystals, CNCs)和纖維素奈米纖維(Cellulose Nanofiber, CNF)，並搭配刮刀塗佈(blade coating)和溶液澆鑄(solution casting)製程，進行PVA複合薄膜的製備，並以雙面溶液澆鑄:聚乙二醇(Polyethylene glycol, PEG)-聚乳酸(Poly(lactic acid), PLA)(PEG-PLA)和純PLA疏水材料，再執行不同溫度和時間之熱處理，製作出疏水化PVA複合薄膜，並與市售之封口膜和吸管進行比較。
在PVA複合薄膜方面，PVA添加CNCs或CNF因基材和填料間的氫鍵和凡得瓦力，使PVA複合薄膜水蒸氣阻隔性、機械性質和熱性質更佳。含有疏水材料之PVA複合薄膜，藉由調整熱處理的溫度和時間，PEG和PLA的結晶度均能有效地提高，使接觸角和水蒸氣阻隔能力明顯提升，也可減緩吸水率上升的趨勢。
將含有疏水材料之PVA複合薄膜與市售之封口膜和吸管進行比較。接觸角在25分鐘時，PVA複合薄膜可保持在40°，市售的PP和ES-PE皆低於此角度；三者的的水蒸氣滲透，WVP皆可達到0.3×10-10∙g/(m∙s∙Pa)；三者的吸水率在60分鐘時可低於40 %；機械性質方面，PVA複合薄膜可達到楊氏模數:1.8 GPa、抗拉強度:60 MPa、斷裂應變:200 %和韌性:100 J/m3的目標，PP和ES-PE皆少於此數值；熱壓剝離中三者皆可達平均剝離力0.7 N的宗旨。

This research has developed hydrophobic and environmentally friendly polyvinyl alcohol (PVA) film material to serve as an alternative to commercial sealing films and straws. In this experiment, biodegradable cellulose nanocrystals (CNCs) and cellulose nanofiber (CNF) were added, and the blade coating and solution casting processes were employed. Also, double-sided solution casting of polyethylene glycol-poly(lactic acid) (PEG-PLA) and Neat PLA hydrophobic films was performed, followed by heat treatments at different temperatures and times to hydrophobized the PVA composite film. The prepared PVA composite film was then compared with the commercial sealing films and straws. In the PVA composite film containing hydrophobic materials, the crystallinity of PLA can be increased by adjusting the heat treatment temperature and time, thereby significantly improving the contact angle and the water vapor barrier property. Furthermore, the trend of water absorption could also be reduced.

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