頁籤選單縮合
題 名 | Reversibility of Thermodynamic Lower Critical Solution Temperature Phenomenon in Miscible Poly ( -Caprolactone)/Poly (Benzyl Methacrylate) |
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作 者 | Mandal,Tarun K.; Woo,E. M.; | 書刊名 | Journal of Polymer Research |
卷 期 | 5:4 1998.10[民87.10] |
頁 次 | 頁205-211 |
分類號 | 346.84 |
關鍵詞 | Polycaprolactone; Poly benzyl methacrylate; Miscibility; LCST; Reversibility; Binodal; |
語 文 | 英文(English) |
英文摘要 | Differential scanning calorimetry and optical microscopy were performed to examine the reversibility of phase separation at above the lower critical solution temperatures in a miscible poly(ε-caprolactone)(PLC)/poly (benzyl methacrylate)(PBzMA) blend system. Upon heating, phase separation occurred via a binodal nucleation and growth (NG) mechanism at above 240℃, which is a lower critical solution temperature (LCST). The pattern of phase domains suggests that the phase separation was meta-stable. Interestingly, the LCST phase separation was found to be readily reversible to original homogeneity upon cooling at regularly accessible rates. A major factor may be that the temperature window between the LCST curve and blend Tg curve is wide, resulting in a convenient temperature range for the polymer chains to kinetically reorganize to a state favored by the thermodynamic conditions. |
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