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.

Dergi Adı Journal of Applied Polymer Science
Dergi Cilt Bilgisi 124
Dergi Sayısı 1
Sayfalar 536 - 548
Yayın Yılı 2012
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
Açık Erişim Tarihi
[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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initiators polyethylene glycol copolymers polymerization branched 2-bromo propanoyl radical chloride macromonomer polymers block/graft cross-linked obtain transition products characterization Macromonomer techniques analysis Thermal PEG-b-PNIPAM MIM-ATRP initiated (NIPAM) thermo-responsive character Periodicals evaluated kinetics copolymerization PNIPAM temperature exhibited
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