Citation: . SELF-ASSEMBLY OF ROD-COIL DIBLOCK COPOLYMERS——INFLUENCE OF THE ROD LENGTH*[J]. Chinese Journal of Polymer Science, ;2003, 21(5): 569-573. shu

SELF-ASSEMBLY OF ROD-COIL DIBLOCK COPOLYMERS——INFLUENCE OF THE ROD LENGTH*

Received Date: 13 March 2003
Revised Date: 8 May 2003

The self-assembly of five narrowly distributed novel rod-coil diblock copolymers, poly(styrene-block-(2, 5-bis[4-methoxy-phenyl]oxycarbonyl) styrene) (PS-b-PMPCS), in p-xylene, a selective solvent at room temperature, was studied. Therod-coil copolymers, which have the same PS length but different PMPCS length, were synthesized by 2,2,6,6-tetramethyl-I-piperidinyloxy (TEMPO) mediated living free radical polymerization. The influence of the rod length on the self-assembly morphology was studied by transmission electron microscopy (TEM). At a concentration of 2.0 mg/mL,those copolymers with relatively shorter PMPCS length (copolymers 1 and 2) form individual spherical micelles;those with relatively longer PMPCS length(copolymer 3 and 4) form "pearl chains"coexisting with individual spherical micelles;the ones with longest PMPCS length form "pearl chains"coexisting with occasionally formed nanofibees.The diameter of all the morphologies was controlled by the rod length.This gives us a way to govern the self-assembly morphology by altering the length of one block in the block copolymer.
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