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.
| Yazar |
Allı, Sema Allı, Abdulkadir Hazer, Baki |
| Yayın Türü | Article |
| Tek Biçim Adres | https://hdl.handle.net/20.500.12628/6124 |
| Tek Biçim Adres | 10.1002/app.34933 |
| Konu Başlıkları |
atom transfer radical polymerization (ATRP)
graft copolymers hyperbranched stimuli-sensitive polymers |
| Koleksiyonlar |
Fakülteler Fen Edebiyat Fakültesi Kimya Bölümü Makale Koleksiyonu (Kimya Bölümü) Araştırma Çıktıları | WoS | Scopus | TR-Dizin | PubMed | SOBİAD Scopus İndeksli Yayınlar Koleksiyonu Araştırma Çıktıları | WoS | Scopus | TR-Dizin | PubMed | SOBİAD WoS İndeksli Yayınlar Koleksiyonu |
| 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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