Application of a new unimolecular initiator in the synthesis of (alpha,omega) ketone functionalized polystyrene in nitroxide mediated polymerization

作者：Megiel Elzbieta^*

来源：Journal of Applied Polymer Science, 2013, 127(6): 4858-4864.

DOI：10.1002/app.38086

• N-alkoxyamine
• nitroxide-mediated radical polymerization
• telechelic polymers
• unimolecular initiator

The ketone functionalized N-alkoxyamine, a derivative of 4-oxo-2,2,6,6-tetramethylpiperidin-1-oxyl (4-oxo-TEMPO) was synthesized and applied as an initiator in the nitroxide mediated polymerization of styrene in bulk at 120 degrees C. In the presence of the prepared initiator: 1-phenyl-1-(4-oxo-2,2,6,6-tetramethylpiperidinoxy)propanone polymers with well-defined molecular weight were obtained. By contrast, when an accelerator such as acetic anhydride (10%) was added to the system, lower control of polymerization was observed. Additionally, the functionality of polymers was evaluated on the basis of a quantitative investigation of UVvisible spectra of 2,4-dinitrophenylhydrazone formed from the polymers and the synthesized initiator. The UVvis spectra of the hydrazone derivatives obtained from polymers by means of 2,4-dinitrophenylhydrazone made it possible to confirm that the polymers prepared in the presence of the ketone functionalized N-alkoxyamine retain the ketone functionality on the polymer chain. The functionality for the obtained polymers exceeded 1 significantly. The obtained (a, ?) telechelic polymers are of great importance in the synthesis of new biohybrid materials such as bioconjugates with proteins or peptides as well as new polymer nanostructures.

• 出版日期2013-3-15