Crystallization and stereocomplexation behavior of poly(D‐ and L‐lactide)‐b‐poly(N,N‐dimethylamino‐2‐ethyl methacrylate) block copolymers |
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| Authors: | Rose Mary Michell Alejandro J. Müller Mariya Spasova Philippe Dubois Stefano Burattini Barnaby W. Greenland Ian W. Hamley Daniel Hermida‐Merino Nicolas Cheval Amir Fahmi |
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| Affiliation: | 1. Departamento de Ciencia de los Materiales, Grupo de Polímeros USB, Universidad Simón Bolívar, Apartado 89000, Caracas 1080‐A, Venezuela;2. Laboratory of Polymeric and Composite Materials, Center of Innovation and Research in Materials & Polymers (CIRMAP), University of Mons‐Hainaut, Place du Parc 20, Mons B‐7000, Belgium;3. Department of Chemistry, University of Reading, Reading RG6 6AD, United Kingdom;4. ESRF, 6 rue Jules Horowitz, BP 220, Grenoble 38043 Cedex 9, France;5. Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom |
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| Abstract: | ![]()
The thermal properties, crystallization, and morphology of amphiphilic poly(D ‐lactide)‐b‐poly(N,N‐dimethylamino‐2‐ethyl methacrylate) (PDLA‐b‐PDMAEMA) and poly (L ‐lactide)‐b‐poly(N,N‐dimethylamino‐2‐ethyl methacrylate) (PLLA‐b‐PDMAEMA) copolymers were studied and compared to those of the corresponding poly(lactide) homopolymers. Additionally, stereocomplexation of these copolymers was studied. The crystallization kinetics of the PLA blocks was retarded by the presence of the PDMAEMA block. The studied copolymers were found to be miscible in the melt and the glassy state. The Avrami theory was able to predict the entire crystallization range of the PLA isothermal overall crystallization. The melting points of PLDA/PLLA and PLA/PLA‐b‐PDMAEMA stereocomplexes were higher than those formed by copolymer mixtures. This indicates that the PDMAEMA block is influencing the stability of the stereocomplex structures. For the low molecular weight samples, the stereocomplexes particles exhibited a conventional disk‐shape structure and, for high molecular weight samples, the particles displayed unusual star‐like shape morphology. © 2011 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 49: 1397–1409, 2011 |
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| Keywords: | block copolymers crystallization crystallization in block copolymers isothermal crystallization kinetics poly(lactic acid) copolymers stereocomplexes stereospecific polymers |
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