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Regulation of Micellar Morphology of PCL‐ b ‐PEO Block Copolymers by Crystallization Temperature
Author(s) -
Du ZiXiu,
Xu JunTing,
Fan ZhiQiang
Publication year - 2008
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200700795
Subject(s) - micelle , crystallization , lamellar structure , morphology (biology) , copolymer , materials science , chemical engineering , polymer chemistry , crystallography , polymer , chemistry , composite material , aqueous solution , organic chemistry , biology , engineering , genetics
The effect of crystallization temperature on the micellar morphology of PCL‐ b ‐PEO block copolymers in water has been studied. It is found that the micellar morphology of PCL n PEO 44 and PCL n PEO 113 changes with crystallization temperature in different ways because of two competitive factors: perfection of the PCL crystals in the core and deformation of the soluble PEO block. For PCL n PEO 44 , perfection of the PCL crystals dominates the micellar morphology and lamellar micelles are formed at a higher crystallization temperature. For PCL n PEO 113 the micellar morphology is mainly determined by the tethering density and spherical micelles or cylindrical micelles with a larger length/diameter ratio are formed at a higher crystallization temperature because of the larger tethering density.
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