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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/1896

    標題: 具不同立體異構性PMAS和另一高分子的摻合研究
    Polymer Blends of Different Tactic PMAs with Other Polymers
    作者: 徐文平
    Wen-Ping Hsu
    貢獻者: 醫藥化學系
    關鍵字: 聚甲基丙烯酸甲酯
    Polymethyl methacrylate
    Polymer blend
    Polystyrene acrylonitrile
    日期: 1999
    上傳時間: 2008-07-18 16:23:23 (UTC+8)
    出版者: 台南縣:嘉南藥理科技大學醫藥化學系
    摘要: 亂排PMMA和同排PMMA及PSAN都相容,但同排PMMA和PSAN卻不相容。本研究主要在探討同排PMMA、亂排PMMA和PSAN三種混合物的相容性並建立它們的三相圖。實驗結果顯示當三相混合物含高濃度同排PMMA及低濃度PSAN時呈現不相容性。
    Previously, atactic and syndiotactic poly(methyl methacrylates) (PMMAs) were found to be miscible with poly(styrene-co-acrylonitrile) because all the prepared films were transparent and showed composition dependent glass transition temperatures (T/sub g/s). However, the isotactic PMMA/PSAN blend was immiscible because most of the cast films were translucent and had two glass transition temperatures. Isotactic PMMA is known to be miscible with atactic PMMA according to literature. Atactic PMMA is miscible with both PSAN and isotactic PMMA but PSAN and isotactic PMMA are immiscible. It will be interesting to study the miscibility of ternary blends of isotactic and atactic PMMAs and PSAN. An investigation based on this is reported in this article. Calorimetry was used as the principal tool to study miscibility. A blend composed of isotactic and atactic PMMAs was also prepared and confirmed to be miscible. T/sub g/ of this blend seemed to vary linearly with composition. An approximate phase diagram of the ternary blends was established based on differential scanning calorimetry data. The results indicated that the ternary blends rich in isotactic PMMA and with a low PSAN concentration were found to be immiscible. One possible cause is attributed to more repulsive MMA-styrene interaction and/or MMA-AN interaction between isotactic PMMA and PSAN.
    關聯: 計畫編號:NSC88-2216-E041-001
    Appears in Collections:[醫藥化學系 ] 科技部計畫

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