Phase behavior of the polymer/drug system PLA/DEET

Phase behavior of the polymer/drug system PLA/DEET
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聚合物/药物系统 PLA/DEET 的相行为

DOI:
10.1016/j.polymer.2017.08.031
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发表时间:
2017
期刊:
影响因子:
4.6
通讯作者:
Androsch R
Androsch R
中科院分区:
化学2区
文献类型:
--
作者:
Sungkapreecha C;Iqbal N;Gohn AM;Focke WW;Androsch R

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为了筛选生物相容、可生物降解的聚乳酸/N,N-二乙基-3-甲基苯甲酰胺(DEET)作为药物载体的潜在用途,建立了聚乳酸/N,N-二乙基-3-甲基苯甲酰胺(DEET)二元聚合物/药物体系的相图。结晶诱导的固液(S-L)相分离发生在含有可结晶的聚乳酸的液体溶液在略高于环境温度的足够缓慢的冷却。非等温结晶从点状晶核开始,后期由于溶液中可结晶聚合物的耗尽,导致树枝晶生长。对真空干燥结晶体系的分析表明,形成了孔径小于10μm的球晶内支架状结构。如果外消旋无规聚乳酸共聚物由于快速冷却或高浓度的立体缺陷而抑制结晶,则液-液(L-L)相分离为几乎纯的DEET相,在略低于室温的温度下发生PLA/DEET溶液。然后,这两个液态在各自的玻璃化转变温度下玻璃化,温度分别为约−75℃(聚乙二烯)和约10−15℃(聚乳酸/聚乙二烯)。
The phase diagram of the binary polymer/drug system poly (lactic acid) (PLA) andN,N-diethyl-3-methylbenzamide (DEET) has been established for the purpose of screening the potential use of biocompatible and biodegradable PLA as drug-delivery reservoir for DEET. Crystallization-induced solid-liquid (S-L) phase separation occurs on sufficiently slow cooling of liquid solutions containing crystallizable PLA at temperatures slightly higher than ambient. Non-isothermal crystallization starts spherulitically at point-like nuclei, followed by dendritic crystal growth due to depletion of crystallizable polymer in the solution in the later stage. Analysis of vacuum-dried crystallized systems reveals formation of intra-spherulitic scaffold-like structures with a pore size smaller than 10 μm. If crystallization is suppressed due to fast cooling or high concentration of stereodefects in racemic random PLA copolymers then liquid-liquid (L-L) phase separation into an almost pure DEET phase and a PLA/DEET solution occurs at temperatures slightly below room temperature. The two liquid phases then vitrify at their respective glass transition temperatures of around −75 °C (DEET) and −15 °C (PLA/DEET).
液体 N,N-二乙基-3-甲基苯甲酰胺 (DEET) 中的动态交叉和德拜-斯托克斯-爱因斯坦关系
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