Phase behavior of the polymer/drug system PLA/DEET
Phase behavior of the polymer/drug system PLA/DEET
复制标题
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
中科院分区:
文献类型:
--
作者:
Sungkapreecha C;Iqbal N;Gohn AM;Focke WW;Androsch R
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).
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影响因子:
3.4
作者:
Philip J. Griffin;J. Sangoro;Yangyang Wang;A. Holt;V. Novikov;A. Sokolov;A. Sokolov;Z. Wojnarowska;M. Paluch;F. Kremer
通讯作者:
F. Kremer
DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
K. Krishnan;J. Brandts
通讯作者:
J. Brandts
DOI:
--
发表时间:
2010
期刊:
影响因子:
--
作者:
Koyama T;Ehashi T;Ohshima N;Miyoshi H.;Hideto Tsuji
通讯作者:
Hideto Tsuji
影响因子:
3.5
作者:
Akhtar, Mohamed U.;Focke, Walter W.
通讯作者:
Focke, Walter W.
影响因子:
8.2
作者:
Chi Zhang
通讯作者:
Chi Zhang