Crystal Structure and Morphology of Poly(l-lactide-b-d-lactide) Diblock Copolymers


Li, Liangbin and Zhong, Zhiyuan and Jeu, Wim H. de and Dijkstra, Pieter J. and Feijen, Jan (2004) Crystal Structure and Morphology of Poly(l-lactide-b-d-lactide) Diblock Copolymers. Macromolecules, 37 (23). pp. 8641-8646. ISSN 0024-9297

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Abstract: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.
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