Low-temperature clean preparation of poly(lactic acid) foams by combining ethyl lactate and supercritical CO2 : correlation between processing and foam pore structure
作者： Aurelio Salerno , Concepción Domingo
DOI: 10.1002/PI.4677
关键词: Lactic acid 、 Polymer 、 Blowing agent 、 Ethyl lactate 、 Crystallization 、 Mole fraction 、 Chemical engineering 、 Composite material 、 Plasticizer 、 Supercritical fluid 、 Materials science 、 Polymers and Plastics
摘要: This study reports the low-temperature and clean fabrication of porous poly(lactic acid) (PLA) through solid-state foaming using various mixtures ethyl lactate (EL) supercritical CO2 (scCO2) as blowing agent. Results showed that adding a small amount EL (up to 0.2% molar fraction) scCO2 enhanced plasticizing effect agent mixture. As direct consequence, at an operating temperature 35 °C, PLA foams could be manufactured with homogeneous morphology, density low 0.09 ± 0.01 g cm−3, mean pore sizes up 519.0 205.0 µm densities in range 2.0 × 105 3.4 × 108 pores cm−3. Conversely, 40 increase plasticizer concentration mixture promoted crystallization polymer during sorption stage and, consequently, was slightly reduced. © 2013 Society Chemical Industry
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