Abstract
Hydrophilic homopolymers in aqueous solution would play an important role on thermally induced physical gelation of stereocomplexable gels. Herein, the sol-gel transition, rheological behavior, crystalline structure and microstructure evolution of stereocomplexable copolymers composed of PLLA, PDLA and PEG in presence of PEG homopolymers have been systematically investigated. Ts-g of systems including PEG was much lower than that of enantiomeric mixtures. Ts-g was 36 °C after addition of PEG (Mn = 6 kg/mol), which was 6 °C below that of additive-free counterparts. The efficiency in reducing Ts-g was increased with increase of concentration of PEG, and depended on MW of PEG. Moreover, additives containing systems exhibited improved storage modulus, more compact packing of core-forming segments, larger inter-cluster distances and core radius. Essence of decrement of Ts-g by presence of PEG was the enhanced stereocomplex crystallization. This study illustrates that addition agents can serve as a regulator to modulate sol-gel transition behaviors of stereocomplexable systems.
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