Solvent free generation of open and skinless foam in poly(l-lactic acid)/Poly(d,l-lactic acid) blends using carbon dioxide

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DOIResolve DOI: http://doi.org/10.1021/ie3000997
AuthorSearch for: ; Search for:
TypeArticle
Journal titleIndustrial & Engineering Chemistry Research
ISSN0888-5885
1520-5045
Volume51
Issue19
Pages67226730; # of pages: 9
AbstractFoams generated via carbon dioxide (CO2) processing typically exhibit a solid skin layer on the exterior surface and a closed-pore structure with limited interconnectivity in the core section thus limiting its application for biomedical intent. By controlling the properties of poly(l-lactic acid)/poly(d,l-lactic acid) (PLLA/PDLLA) blends and using CO2 with specific processing parameters, skinless foams with interconnected porous structure were prepared in this work using only CO2 as a physical foaming agent, which overcome the necessity to use organic solvents and solid porogens. The crystallization behaviors and sorption kinetics of PLLA and its blends were studied. Addition of PDLLA reduces the crystallinity of PLLA/PDLLA blends while treated with CO2 as compared to neat PLLA. The solubility and diffusion coefficients of CO2 in PLLA and its blends were found to be similar. Furthermore, the effect of PLLA/PDLLA blend ratio and CO2 treatment conditions on the foam morphologies was investigated. Through fine parameter control, well interconnected pore structures with a porous surface were generated. Results indicated that by controlling the physical properties of samples combined with optimizing CO2 foaming process, it is indeed possible to create biodegradable interconnected porous structures for potential biomedical applications.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada
Peer reviewedYes
NPARC number21268997
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Record identifier3857ec58-b041-4cc4-8dd7-014af8fd6b8c
Record created2013-11-29
Record modified2016-05-09
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