Unique leafy morphology of poly(lactic acid) monoliths controlled via novel phase separation technology
Unique leafy morphology of poly(lactic acid) monoliths controlled via novel phase separation technology
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DOI：
10.1039/c7ra05658c
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发表时间：
2017-01-01
期刊：
影响因子：
3.9
通讯作者：
Uyama, Hiroshi
中科院分区：
文献类型：
--
作者：
Kanno, Tomonari;Uyama, Hiroshi
这项工作报告了采用新型热致相分离（TIPS）技术设计的植物基聚乳酸（PLA）整体的独特叶状形态和物理特性。使用三元溶剂，使用 1,4-二恶烷作为良溶剂，水作为非溶剂，2-丁酮作为控制相分离的中间溶剂，通过 TIPS 成功生产了具有微米至纳米级框架和叶状形态的 PLA 整体材料。首次揭示中间溶剂的添加显着影响PLLA的形貌和结晶，从而实现形貌的精确可控性和高孔隙率（90-93%）。为 TIPS 提出了溶剂的三元相图，成功地解释了目前的结果。事实证明，与最常用的二元溶剂 TIPS 相比，新开发的极其简单的 TIPS 非常适合合成 PLA 整体材料。
This work reports the unique leaf-like morphology and physical properties of plant-based poly(lactic acid) (PLA) monoliths designed by a novel thermally induced phase separation (TIPS) technology. PLA monoliths with micron to nano scale frameworks and a leaf-like morphology were successfully produced via TIPS with ternary solvent using 1,4-dioxane as a good solvent, water as a non-solvent, and 2-butanone as a midsolvent which controls phase separation. It was revealed for the first time that the addition of midsolvent significantly affects the morphology and crystallization of PLLA, which leads to a precise controllability in morphology and high porosity (90-93%). A ternary phase diagram of the solvents was proposed for the TIPS, which successfully explained the present results. It was demonstrated that the newly developed, amazingly simple TIPS is ideal for the synthesis of PLA monoliths compared to the most commonly used TIPS with binary solvent.