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Synthesis of amphiphilic star block copolymer with photosensitive core by ATRP

Synthesis of amphiphilic star block copolymer with photosensitive core by ATRP Abstract Well-defined photo and pH-sensitive amphiphilic star block copolymers were synthesized by copper based atom transfer radical polymerization, which consisted of a hydrophilic pH sensitive shell and photosensitive hydrophobic core structure. For this, photosensitive n-butyl acrylate (nBA) star polymer was synthesized with a multi-functionalized initiator including Pd-coordinated porphyrin in combination with CuBr and 4,4′-dinonyl-2,2′-bipyridyl (dNbpy) (PDI < 1.09). This hydrophobic photosensitive nBA star polymer was then used as a macroinitiator and polymerized with N,N′-dimethylamino ethyl methacrylate (DMAEMA) in the CuCl/CuCl2/dNbpy catalytic system to synthesize PnBA-PDMAEMA star block copolymer, where the PDMAEMA block segment worked as a base exterior. For the arm chain consisted of an acid exterior block segment, the nBA star polymer macroinitiator was polymerized with tert-butyl acrylate (tBA) in the CuBr/dNbpy catalytic system to synthesize the PnBA-PtBA star block copolymer followed by a treatment with strong acid for deprotecting the tert-butyl groups in the PtBA block segment to give PnBA-poly(acrylic acid) (PAA) star block copolymer. Both amphiphilic photosensitive star block copolymers showed well defined molecular weights with narrow polydispersities (PDI < 1.23). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png "Macromolecular Research" Springer Journals

Synthesis of amphiphilic star block copolymer with photosensitive core by ATRP

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References (17)

Publisher
Springer Journals
Copyright
2011 The Polymer Society of Korea and Springer Netherlands
ISSN
1598-5032
eISSN
2092-7673
DOI
10.1007/s13233-011-0508-6
Publisher site
See Article on Publisher Site

Abstract

Abstract Well-defined photo and pH-sensitive amphiphilic star block copolymers were synthesized by copper based atom transfer radical polymerization, which consisted of a hydrophilic pH sensitive shell and photosensitive hydrophobic core structure. For this, photosensitive n-butyl acrylate (nBA) star polymer was synthesized with a multi-functionalized initiator including Pd-coordinated porphyrin in combination with CuBr and 4,4′-dinonyl-2,2′-bipyridyl (dNbpy) (PDI < 1.09). This hydrophobic photosensitive nBA star polymer was then used as a macroinitiator and polymerized with N,N′-dimethylamino ethyl methacrylate (DMAEMA) in the CuCl/CuCl2/dNbpy catalytic system to synthesize PnBA-PDMAEMA star block copolymer, where the PDMAEMA block segment worked as a base exterior. For the arm chain consisted of an acid exterior block segment, the nBA star polymer macroinitiator was polymerized with tert-butyl acrylate (tBA) in the CuBr/dNbpy catalytic system to synthesize the PnBA-PtBA star block copolymer followed by a treatment with strong acid for deprotecting the tert-butyl groups in the PtBA block segment to give PnBA-poly(acrylic acid) (PAA) star block copolymer. Both amphiphilic photosensitive star block copolymers showed well defined molecular weights with narrow polydispersities (PDI < 1.23).

Journal

"Macromolecular Research" – Springer Journals

Published: May 1, 2011

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