Synthesis of amphiphilic star block copolymer with photosensitive core by ATRP

Title
Synthesis of amphiphilic star block copolymer with photosensitive core by ATRP
Authors
백경열이상협황승상
Keywords
star polymers; amphiphilic block copolymers; photosensitizer; atom transfer radical polymerization
Issue Date
2011-05
Publisher
Macromolecular research
Citation
VOL 19, NO 5, 461-467
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).
URI
http://pubs.kist.re.kr/handle/201004/40415
ISSN
1598-5032
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KIST Publication > Article
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