Syntheses and specific interactions of poly(hydroxyethyl methacrylate-b-vinyl pyrrolidone) diblock copolymers and comparisons with their corresponding miscible blend systems

Chih-Feng Huang, Shiao-Wei Kuo, Fang-Ju Lin, Chih-Feng Wang, Chen-Jui Hung, Feng-Chih Chang
2006 Polymer  
Combination of atom transfer radical and conventional free radical polymerizations has been successfully used to prepare poly(hydroxyethyl methacrylate-b-vinyl pyrrolidone) (PHEMA-b-PVP) copolymers with controlled molecular weight and low polydispersity (<1.4). The thermal behavior and specific interaction of PHEMA-b-PVP diblock copolymers and their corresponding PHEMA/PVP blends were characterized. The result shows that glass transition temperatures of diblock copolymers analysed by
more » ... l scanning calorimetry (DSC) are higher than those of the blends. Infrared and solid-state NMR spectroscopic analyses show that hydrogen-bonding interaction of hydroxylecarbonyl groups of diblock copolymers was also greater than that of the blends. Measurement of the proton spinelattice relaxation time in the rotating frame, ðT H 1r Þ, reveals that all diblock copolymers and blends possess one composition-dependent T H 1r , indicating that both diblock copolymers and blends are homogeneous, which is consistent with the DSC analysis.
doi:10.1016/j.polymer.2006.07.071 fatcat:oazbyqcgq5fypc5qujc6rbb2i4