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Synthesis and Self-Assembly of pH-Responsive Amphiphilic Poly(dimethylaminoethyl methacrylate)-block-Poly(pentafluorostyrene) Block Copolymer in Aqueous Solution

Synthesis and Self-Assembly of pH-Responsive Amphiphilic Poly(dimethylaminoethyl methacrylate)-block-Poly(pentafluorostyrene) Block Copolymer in Aqueous Solution

Beng H Tan, Chakravarthy S Gudipati, Hazrat Hussain, Chaobin He, Ye Liu, Thomas P Davis

Macromol Rapid Commun. 2009 Jun 17;30(12):1002-8.

PMID: 21706562

Abstract:

We report the synthesis of a novel pH-responsive amphiphilic block copolymer poly(dimethylaminoethyl methacrylate)-block-poly(pentafluorostyrene) (PDMAEMA-b-PPFS) using RAFT-mediated living radical polymerization. Copolymer micelle formation, in aqueous solution, was investigated using fluorescence spectroscopy, static and dynamic light scattering (SLS and DLS), and transmission electron microscopy (TEM). DLS and SLS measurements revealed that the diblock copolymers form spherical micelles with large aggregation numbers, N(agg) ≈ 30 where the dense PPFS core is surrounded by dangling PDMAEMA chains as the micelle corona. The hydrodynamic radii, R(h) of these micelles is large, at pH 2-5 as the protonated PDMAEMA segments swell the micelle corona. Above pH 5, the PDMAEMA segments are gradually deprotonated, resulting in a lower osmotic pressure and enhanced hydrophobicity within the micelle, thus decreasing the R(h) . However, the radius of gyration, R(g) remains independent of pH as the dense PPFS cores predominate.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP26838551	Poly(pentafluorostyrene)		26838-55-1	Price

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