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Syntheses and specific interactions of poly(hydroxyethyl methacrylate-b-vinyl pyrrolidone) diblock copolymers and comparisons with their corresponding miscible blend systems
- Source :
-
Polymer . Sep2006, Vol. 47 Issue 20, p7060-7069. 10p. - Publication Year :
- 2006
-
Abstract
- Abstract: 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 differential scanning calorimetry (DSC) are higher than those of the blends. Infrared and solid-state NMR spectroscopic analyses show that hydrogen-bonding interaction of hydroxyl–carbonyl groups of diblock copolymers was also greater than that of the blends. Measurement of the proton spin–lattice relaxation time in the rotating frame, , reveals that all diblock copolymers and blends possess one composition-dependent , indicating that both diblock copolymers and blends are homogeneous, which is consistent with the DSC analysis. [Copyright &y& Elsevier]
Details
- Language :
- English
- ISSN :
- 00323861
- Volume :
- 47
- Issue :
- 20
- Database :
- Academic Search Index
- Journal :
- Polymer
- Publication Type :
- Academic Journal
- Accession number :
- 22394779
- Full Text :
- https://doi.org/10.1016/j.polymer.2006.07.071