Hyperbranched homo and thermoresponsive graft copolymers by using ATRP-macromonomer initiators

Macromonomer initiators behave as macro cross-linkers, macro initiators, and macromonomers to obtain branched and cross-linked block/graft copolymers. A series of new macromonomer initiators for atom transfer radical polymerization (MIM-ATRP) based on polyethylene glycol (M n = 495D, 2203D, and 4203D) (PEG) were synthesized by the reaction of the hydroxyl end of mono-methacryloyl polyethylene glycol with 2-bromo propanoyl chloride, leading to methacryloyl polyethylene glycol 2-bromo propanoyl ester. Poly (ethylene glycol) functionalized with methacrylate at one end was reacted with 2-bromopropionyl chloride to form a macromonomeric initiator for ATRP. ATRP was found to be a more controllable polymerization method than conventional free radical polymerization in view of fewer cross-linked polymers and highly branched polymers produced from macromonomer initiators as well. In another scenario, ATRP of N-isopropylacrylamide (NIPAM) was initiated by MIM-ATRP to obtain PEG-b-PNIPAM branched block/graft copolymers. Thermal analysis, FTIR, 1H NMR, TEM, and SEM techniques were used in the characterization of the products. They had a thermo-responsive character and exhibited volume phase transition at â 36°C. A plasticizer effect of PEG in graft copolymers was also observed, indicating a lower glass transition temperature than that of pure PNIPAM. Homo and copolymerization kinetics were also evaluated. © 2011 Wiley Periodicals, Inc.

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Eser Adı
(dc.title)
Hyperbranched homo and thermoresponsive graft copolymers by using ATRP-macromonomer initiators
Yazar
(dc.contributor.author)
Allı, Sema
Yazar
(dc.contributor.author)
Allı, Abdulkadir
Yazar
(dc.contributor.author)
Hazer, Baki
Yayın Yılı
(dc.date.issued)
2012
Yayın Türü
(dc.type)
article
Özet
(dc.description.abstract)
Macromonomer initiators behave as macro cross-linkers, macro initiators, and macromonomers to obtain branched and cross-linked block/graft copolymers. A series of new macromonomer initiators for atom transfer radical polymerization (MIM-ATRP) based on polyethylene glycol (M n = 495D, 2203D, and 4203D) (PEG) were synthesized by the reaction of the hydroxyl end of mono-methacryloyl polyethylene glycol with 2-bromo propanoyl chloride, leading to methacryloyl polyethylene glycol 2-bromo propanoyl ester. Poly (ethylene glycol) functionalized with methacrylate at one end was reacted with 2-bromopropionyl chloride to form a macromonomeric initiator for ATRP. ATRP was found to be a more controllable polymerization method than conventional free radical polymerization in view of fewer cross-linked polymers and highly branched polymers produced from macromonomer initiators as well. In another scenario, ATRP of N-isopropylacrylamide (NIPAM) was initiated by MIM-ATRP to obtain PEG-b-PNIPAM branched block/graft copolymers. Thermal analysis, FTIR, 1H NMR, TEM, and SEM techniques were used in the characterization of the products. They had a thermo-responsive character and exhibited volume phase transition at â 36°C. A plasticizer effect of PEG in graft copolymers was also observed, indicating a lower glass transition temperature than that of pure PNIPAM. Homo and copolymerization kinetics were also evaluated. © 2011 Wiley Periodicals, Inc.
Kayıt Giriş Tarihi
(dc.date.accessioned)
2019-12-23

(dc.date.available)
2019-12-23
Yayın Dili
(dc.language.iso)
eng
Konu Başlıkları
(dc.subject)
atom transfer radical polymerization (ATRP)
Konu Başlıkları
(dc.subject)
graft copolymers
Konu Başlıkları
(dc.subject)
hyperbranched
Konu Başlıkları
(dc.subject)
stimuli-sensitive polymers
Künye
(dc.identifier.citation)
Allı, S., Allı, A. ve Hazer, B. (2012). Hyperbranched homo and thermoresponsive graft copolymers by using ATRP-macromonomer initiators. Journal of Applied Polymer Science, 124(1), 536-548. doi:10.1002/app.34933
Haklar
(dc.rights)
info:eu-repo/semantics/closedAccess
ISSN
(dc.identifier.issn)
0021-8995
İlk Sayfa Sayısı
(dc.identifier.startpage)
536
Son Sayfa Sayısı
(dc.identifier.endpage)
548
Dergi Adı
(dc.relation.journal)
Journal of Applied Polymer Science
Dergi Sayısı
(dc.identifier.issue)
1
Dergi Cilt Bilgisi
(dc.identifier.volume)
124
Tek Biçim Adres
(dc.identifier.uri)
https://dx.doi.org/10.1002/app.34933
Tek Biçim Adres
(dc.identifier.uri)
https://hdl.handle.net/20.500.12628/6124
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