Crystal structure and morphology of poly(L-lactide-b-D-lactide)diblock copolymers

Liangbin Li, Zhiyuan Zhong, Wim H. de Jeu, Pieter J. Dijkstra, Jan Feijen

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The isothermal crystallization behavior of low-molecular-weight (DP 50) poly(l-lactide-b-d-lactide) diblock copolymers is reported, as studied by small- and wide-angle X-ray scattering. The symmetric diblock copolymer crystallizes in the stereocomplex form for the whole range of crystallization temperatures, while the one with a block ratio of 80/20 grows into homocrystallites. For an intermediate block ratio (66/33), the stereocomplex form is obtained at high crystallization temperatures while a coexistence region with homocrystal phase exists at low temperatures. In addition to the transition enthalpy, size effects and kinetic routes play a role in the competition between the stereocomplex and the homocrystalline forms. The lamellar spacing (long period and crystal thickness) shows a different temperature dependence for the three diblock copolymers, which is discussed in relation to the specific morphology and molecular constitution.
Original languageEnglish
Pages (from-to)8641-8646
Issue number23
Publication statusPublished - 2004


  • IR-71378
  • METIS-223576


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