Article

Surface Structure and Stereocomplex Formation of Enantiomeric Polylactide Blends Using Poly(dimethyl siloxane) as a Probe Polymer

  1. Jin-Kook Lee1,
  2. Mi-Ra Kim1,
  3. Hyun-Jeong Lee1,
  4. Ildoo Chung1,
  5. Kwon Taek Lim2,
  6. Sangik Jeon3,
  7. Won-Ki Lee3,*

Article first published online: 12 JUN 2006

DOI: 10.1002/masy.200690115

Issue

Macromolecular Symposia

Macromolecular Symposia

Special Issue: Advanced Polymers, Composites and Technologies

Volume 239, Issue 1, pages 91–96, June 2006

Additional Information

How to Cite

Lee, J.-K., Kim, M.-R., Lee, H.-J., Chung, I., Lim, K. T., Jeon, S. and Lee, W.-K. (2006), Surface Structure and Stereocomplex Formation of Enantiomeric Polylactide Blends Using Poly(dimethyl siloxane) as a Probe Polymer. Macromol. Symp., 239: 91–96. doi: 10.1002/masy.200690115

Author Information

  1. 1

    Dept. Polymer Science & Engineering, Pusan National University, Busan 609-735, Korea

  2. 2

    Division of Image Science and Information Engineering, Pukyong National University, Busan 608-739, Korea

  3. 3

    Division of Chemical Engineering, Pukyong National University, Busan 608-739, Korea

*Division of Chemical Engineering, Pukyong National University, Busan 608-739, Korea. Fax: (+82) 51 625 4055

Publication History

  1. Issue published online: 12 JUN 2006
  2. Article first published online: 12 JUN 2006

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Keywords:

  • poly(d-lactide);
  • poly(l-lactide);
  • stereocomplex;
  • surface segregation

Abstract

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.

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