Abstract
A novel star shaped rod-coil block copolymer, tri-armed star poly (e-caprolactone)-b-poly {2,5-bis[(4-methoxyphenyl) oxycabony] styrene} [S-(PCL-b-PMPCS)3], was successfully synthesized via atom transfer radical polymerization in chlorobenzene solution using macro-initiator and CuBr/Sparteine complex as catalyst. The results showed that the number average molecular weigh Mn was increased versus monomer conversion, and that the polydispersities Mw/Mn was quite narrow (<1.35), which were the character of controlled polymerization. The structure of the star shaped blcok copolymers was experimentally confirmed by 1H NMR. The liquid crystalline behavior of them was studied using DSC and POM. The star shaped block copolymer with low molar percentage of PMPCS block could show Tm of PCL. And only those copolymers with long rigid segment PMPCS could form liquid crystalline phase which was quite stable with a high clearing point.
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