現在位置: 機構典藏 > 詳目
    黃建文-聚乳酸奈米與微米二氧化矽複合薄膜.II融解與冷結晶. Polylactidenano- and micro-sc.pdf
    • 放大檢視
    • 播放
    黃建文-聚乳酸奈米與微米二氧化矽複合薄膜.II融解與冷結晶. Polylactidenano- and micro-sc.pdf檔名:1426002681586.pdf
    篇名/題名:Polylactide/nano- and micro-scale silica composite films. II. Melting behavior and cold crystallization
    摘要:Nonisothermal crystallization of polylactide
    (PLA)/silica composites prepared by (i) directly blending the PLA with nanoscale colloidal silica sol and by (ii) a sol– gel process are studied by differential scanning calorimeter (DSC) at various heating rates. Samples quenched from the molten state exhibited two melting endotherms (Tml and Tmh) due to melt-recrystallization during the DSC scans. Lower heating rate and the presence of silica particles generate a lower peak intensity ratio of Tml /Tmh. The nonisothermal crystallization kinetics is analyzed by modified Avrami model, Ozawa model, and Liu-Mo models. The modified Avrami and Liu-Mo models successfully described the nonisothermal cold crystallization processes, but Ozawa is inapplicable. The nucleation constant (Kg) is calculated by modified Lauritzen-Hoffman equation and the activation energy by Augis-Bennett, Kissinger, and Takhor models. These calculated parameters indicate consistently that the nanoscale silica particles seem to form more heterogeneous ucleation to increase crystallization, but microscale one
    form hindrance to retard crystallization.
    類型:期刊論文
    西元出版年:2009
    著作語言:en
    關鍵詞:melting behaviorcompositepolylactidesilica
    作者:黃建文
    學校系所:美容造型設計系