PREPARATION OF NEW CHOLESTEROL-BASED AMPHIPHILIC LIQUID-CRYSTALLINE DIBLOCK COPOLYMERS via RAFT APPROACH AND THEIR THERMAL PROPERTIES AND SELF-ASSEMBLY IN MIXED SOLUTIONS
Sheng-dian Chen, Fang-zhen Hu, Rui-long Sheng, A-min Cao. PREPARATION OF NEW CHOLESTEROL-BASED AMPHIPHILIC LIQUID-CRYSTALLINE DIBLOCK COPOLYMERS via RAFT APPROACH AND THEIR THERMAL PROPERTIES AND SELF-ASSEMBLY IN MIXED SOLUTIONS[J]. Acta Polymerica Sinica, 2013,(1):102-111.
Sheng-dian Chen, Fang-zhen Hu, Rui-long Sheng, A-min Cao. PREPARATION OF NEW CHOLESTEROL-BASED AMPHIPHILIC LIQUID-CRYSTALLINE DIBLOCK COPOLYMERS via RAFT APPROACH AND THEIR THERMAL PROPERTIES AND SELF-ASSEMBLY IN MIXED SOLUTIONS[J]. Acta Polymerica Sinica, 2013,(1):102-111. DOI: 10.3724/SP.J.1105.2013.12156.
A new series of amphiphilic diblock liquid crystalline copolymers denoted as PMA6Chol-block-PHEMA were prepared by sequential reversible addition-fragmentation chain transfer polymerization (RAFT) and successive removal of TMS protection groups
and their chemical structures were further characterized by 1H-NMR and GPC.By means of differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA)
thermal properties and liquid crystal phase transitions were characterized for the resultant diblock copolymers
and the presence of hydrophilic PHEMA hydrogen-bond network may be one possible reason of higher TLC-I of diblock copolymers than those of PMA6Chol homopolymers.Through nanoprecipitation in THF/water mixed solutions
the synthesized LC diblock copolymers PMA6Chol-block-PHEMA were found to self-assemble into micron-scale core-shell spherical aggregates
and the rapid kinetically trapping rigid LC PMA6Chol chains may be the reason for self-assembling microscopic spheres at ambient temperatures in THF/water mixed solutions.
关键词
嵌段功能大分子胆固醇液晶元可逆加成-断裂链转移聚合纳米沉淀法溶液自组装
Keywords
AmphiphilicLC copolymersReversible addition fragmentation chain transfer (RAFT)Self-assemblyNano-precipitation