期刊
JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
卷 57, 期 2, 页码 98-108出版社
WILEY
DOI: 10.1002/polb.24762
关键词
foams; morphology; phase separation; PLA crystallization; poly(lactic acid) foams; thermally induced phase separation
资金
- TUBITAK (The Scientific and Technological Research Council of Turkey) [2211-A]
Monolithic poly(lactic acid) (PLA) foams were produced by thermally induced phase separation. PLA solutions with concentrations 8-22 wt % were prepared in tetrahydrofuran/methanol (THF/MeOH) solvent/nonsolvent mixtures at 55 degrees C. Homogenous solutions were quenched at -20 degrees C to induce phase separation and gelation. Resulting gels were mechanically stabilized by solvent exchange. Subsequent supercritical CO2 drying yielded monolithic PLA foams. Crystal structure and degree of crystallinity of the foams were obtained by x-ray diffractometry and differential scanning calorimetry. Morphologies were determined by scanning electron microscopy. Tuning the PLA concentration and THF/MeOH ratio enabled preparation of monolithic PLA foams. Depending on the experimental conditions various morphologies, such as: interconnected networks, thin platelets, lamellar stacks, axialites, and spherulites were formed. Monoliths obtained were highly crystalline. By changing the PLA concentration monoliths with controlled average pore sizes (170-1440 nm) and porosities (80-90%) were produced. (c) 2018 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2019, 57, 98-108
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