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The Control of Surface Structure of Fluorocarbon End‐Capped Poly(L‐lactide)/Stereochemical Polylactide Blend Films
Author(s) -
Yoon SeogYoung,
Lee JinKook,
Chung Ildoo,
Park Seong Soo
Publication year - 2007
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.200750415
Subject(s) - fluorocarbon , materials science , differential scanning calorimetry , polymer chemistry , chemical engineering , scanning electron microscope , enantiomer , enthalpy of fusion , composite material , chemistry , organic chemistry , melting point , thermodynamics , physics , engineering
The propose of this study is to investigate stereocomplexation‐induced surface structure of enantiomeric PLA blends on the basis of complex formation between L‐ (LLA) and D‐lacide (DLA) unit sequences. In order to control the complexation, stereochmical PLAs with % D repeat unit contents of 100, 98, 95, 90, and 80 were synthesized from the mixtures of DLA and LLA using stannous octoate as catalyst. Fluorocarbon end‐capped PLLA (F‐PLLA) instead of PLLA was used as a surface probe material because of the surface segregation of fluorocarbon groups. Large changes in the melting temperature (Tm) behavior and the surface structure for (F‐PLLA/stereochmical PLA) blend films were observed by differential scanning calorimetry and electron spectroscopy for chemical analysis, respectively. (F‐PLLA/stereochmical PLA) blend films showed the increase in both Tm and heat of fusion from the stereocomplexes with the optical purity of stereochmical PLAs in the blend. Also, the surface composition of fluorocarbon groups in the blends was proportionally increased with decreasing the optical purity in the blend because the stereocomplex formation in (F‐PLLA/stereochmical PLA) blends prevents the surface segregation of fluorocarbon groups. These results indicate that surface structure of (F‐PLLA/stereochmical PLA) blends could be controlled by changing a degree of complexation.