Porous poly(L‐lactic acid)/poly(ethylene glycol) blend films
Koji NakaneYoshihiro HataKeisuke MoritaTakashi OgiharaNobuo Ogata
Abstract
Abstract Poly( L ‐lactic acid) (PLLA: M w = 19.4 × 10 4 )/poly(ethylene glycol) (PEG: M w = 400) blend films were formed by use of a solvent‐cast technique. The properties and structures of these blend films were investigated. The Young's modulus of the PLLA decreased from 1220 to 417 MPa with the addition of PEG 5 wt %, but the elongation at break increased from 19 to 126%. The melting point of PLLA linearly decreased with increases in the PEG content (i.e., pure PLLA: 172.5°C, PLLA/PEG = 60/40 wt %: 159.6°C). The PEG 20 wt % blend film had a porous structure. The pore diameter was 3–5 μm. The alkali hydrolysis rate of this blend film was accelerated due to its porous structure. © 2004 Wiley Periodicals, Inc. J Appl Polym Sci 94: 965–970, 2004
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