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Surface Structure and Stereocomplex Formation of Enantiomeric Polylactide Blends Using Poly(dimethyl siloxane) as a Probe Polymer
Author(s) -
Lee JinKook,
Kim MiRa,
Lee HyunJeong,
Chung Ildoo,
Lim Kwon Taek,
Jeon Sangik,
Lee WonKi
Publication year - 2006
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200690115
Subject(s) - materials science , siloxane , lactide , copolymer , polymer chemistry , enantiomer , polymer , crystallite , chemical engineering , surface energy , composite material , organic chemistry , chemistry , engineering , metallurgy
In the stereocomplex between enantiomeric poly( l ‐lactide) ( l ‐PLA) and poly( d ‐lactide), crystallites formed as a result of stereocomplexation, equimolar l ‐ and d ‐lactide unit sequences are packed side by side. The stereocomplex exhibits a melting temperature higher by about 50 °C than that of each homopolymer. In this study, we attempt to obtain further insight into the stereocomplex‐induced surface structure of enantiomeric PLA blend films. The design of the blend systems is based on principles of surface segregation of multicomponent polymeric systems with a low surface energy, triblock copolymer ( l ‐PLA‐ b ‐PDMS‐ b ‐ l ‐PLA) of l ‐PLA and poly‐(dimethyl siloxane). ( l ‐PLA‐ b ‐PDMS‐ b ‐ l ‐PLA/ l ‐PLA) blend films showed the surface segregation of PDMS, regardless of blend composition while the surface composition of PDMS in the ( l ‐PLA‐ b ‐PDMS‐ b ‐ l ‐PLA/ d ‐PLA) blend films was strongly depended on blend composition or a degree of complexation. These results are likely due to strong interaction between d ‐ and l ‐lactide unit sequences, which prevents the surface segregation of PDMS.