Preparation and Application of a Dual Light-Responsive Triblock Terpolymer
Reported are the preparation and application of a triblock terpolymer poly(ethylene oxide)-ONB-poly[2-(perfluorooctyl)ethyl methacrylate]-block-poly(2-cinnamoyloxyethyl methacrylate) (PEO-ONB-PFOEMA-b-PCEMA). Here PEO is water-soluble, PCEMA is photo-cross-linkable, PFOEMA is of low surface tension,...
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Published in | Macromolecules Vol. 45; no. 13; pp. 5586 - 5595 |
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Main Authors | , |
Format | Journal Article |
Language | English |
Published |
Washington, DC
American Chemical Society
10.07.2012
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Subjects | |
Online Access | Get full text |
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Summary: | Reported are the preparation and application of a triblock terpolymer poly(ethylene oxide)-ONB-poly[2-(perfluorooctyl)ethyl methacrylate]-block-poly(2-cinnamoyloxyethyl methacrylate) (PEO-ONB-PFOEMA-b-PCEMA). Here PEO is water-soluble, PCEMA is photo-cross-linkable, PFOEMA is of low surface tension, and ONB denotes a photocleavable o-nitrobenzyl unit at the junction of the PEO and PFOEMA blocks. To prepare the copolymer, a macroinitiator bearing an ONB unit between PEO and the initiating site was first synthesized. FOEMA and 2-trimethylsilyloxyethyl methacrylate (HEMA-TMS) were then sequentially polymerized by atom transfer radical polymerization (ATRP) to yield the triblock copolymer PEO-ONB-PFOEMA-b-P(HEMA-TMS). Removal of the trimethylsilyl groups from the P(HEMA-TMS) block and cinnamation of the resultant poly(2-hydroxyethyl methacrylate) block with cinnamoyl chloride resulted in the targeted triblock copolymer. PEO-ONB-PFOEMA-b-PCEMA formed micelles in tetrahydrofuran/water at the water volume fraction of 80%, in which only the PEO block was soluble. Upon photolysis, the micellar PCEMA cores were cross-linked and the micellar coronal PEO chains were cleft, resulting in the precipitation of cross-linked PFOEMA-b-PCEMA nanoparticles. Films of the nanoparticles were water- and oil-repellent due to the exposure of the initially hidden PFOEMA block. |
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ISSN: | 0024-9297 1520-5835 |
DOI: | 10.1021/ma3006476 |