Michell, R. M., Müller, A. J., Spasova, M., Dubois, P., Burattini, S., Greenland, B. W., Hamley, I. W., Hermida-Merino, D., Cheval, N. and Fahmi, A.
Crystallization and stereocomplexation behavior of poly(D- and L-lactide)-b-poly(N,N-dimethylamino-2-ethyl methacrylate) block copolymers.
Journal of Polymer Science Part B: Polymer Physics, 49 (19).
To link to this article DOI: 10.1002/polb.22323
The thermal properties, crystallization, and morphology
of amphiphilic poly(D-lactide)-b-poly(N,N-dimethylamino-
2-ethyl methacrylate) (PDLA-b-PDMAEMA) and poly
(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.
|Date Deposited:||13 Sep 2011 09:38|
|Last Modified:||21 Jul 2016 12:23|
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