Halka Açılımı Metatez Polimerizasyonu Ve Diels-alder Clıck Reaksiyonları İle Aşı Kopolimerleri Eldesi
Halka Açılımı Metatez Polimerizasyonu Ve Diels-alder Clıck Reaksiyonları İle Aşı Kopolimerleri Eldesi
Dosyalar
Tarih
2011-01-31
Yazarlar
Cerit, Neşe
Süreli Yayın başlığı
Süreli Yayın ISSN
Cilt Başlığı
Yayınevi
Fen Bilimleri Enstitüsü
Institute of Science and Technology
Institute of Science and Technology
Özet
Antrasen fonksiyonlu okzanorbornen monomeri ve ω-antrasen uç-fonksiyonlandırılmış okzanorbornenil PS makromonomeri oda sıcaklığında diklorometan içerisinde birinci jenerasyon Grubbs katalizörü kullanılarak halka açılma metatez polimerizasyonu ile sentezlendi. Sonra 120 oC’ de toluende Diels-Alder reaksiyonu ile maleimid uç-fonksiyonlu polimerler, PEG-MI, PMMA-MI ve PtBA-MI sırasıyla poly(oxanorbornen)-g-PEG, poly(oxanorbornen)-g-PMMA aşı kopolimerleri ve poly(oxanorbornen)-g-(PS-b-PEG), poly(oxanorbornen)-g-(PS-b-PMMA), ve poly(oxanorbornen)-g-(PS-b-PtBA) aşı blok kopolimerleri eldesi için sentezlendi. Aşı kopolimerizasyonun Diels-Alder click reaksiyonu etkinliği UV-Vis spektroskopisi ile gözlemlendi. Aşı kopolimerleri ve aşı blok kopolimerlerinin dn/dc değerleri üçlü dedektör GPC (TD-GPC) kullanılarak elde edildi ve bu değerler cihaza tanıtılarak molekül ağırlıkları, intrinsik viskozite ([η]) and hidrodinamik yarıçapı (Rh) değerleri elde edildi.
Anthracene-functionalized oxanorbornene monomer and oxanorbornenyl polystyrene (PS) with x-anthracene endfunctionalized macromonomer were first polymerized via ringopening metathesis polymerization using the first-generation Grubbs’ catalyst in dichloromethane at room temperature and then clicked with maleimide end-functionalized polymers, poly(ethylene glycol) (PEG)-MI, poly(methyl methacrylate) (PMMA)-MI, and poly(tert-butyl acrylate) (PtBA)-MI in a Diels– Alder reaction in toluene at 120 C to create corresponding graft copolymers, poly(oxanorbornene)-g-PEG, poly(oxanorbornene)- g-PMMA, and graft block copolymers, poly(oxanorbornene)- g-(PS-b-PEG), poly(oxanorbornene)-g-(PS-b-PMMA), and poly(oxanorbornene)-g-(PS-b-PtBA), respectively. Diels–Alder click reaction efficiency for graft copolymerization was monitored by UV–vis spectroscopy. The dn/dc values of graft copolymers and graft block copolymers were experimentally obtained using a triple detection gel permeation chromatography and subsequently introduced to the software so as to give molecular weights, intrinsic viscosity ([η]) and hydrodynamic radius (Rh) values.
Anthracene-functionalized oxanorbornene monomer and oxanorbornenyl polystyrene (PS) with x-anthracene endfunctionalized macromonomer were first polymerized via ringopening metathesis polymerization using the first-generation Grubbs’ catalyst in dichloromethane at room temperature and then clicked with maleimide end-functionalized polymers, poly(ethylene glycol) (PEG)-MI, poly(methyl methacrylate) (PMMA)-MI, and poly(tert-butyl acrylate) (PtBA)-MI in a Diels– Alder reaction in toluene at 120 C to create corresponding graft copolymers, poly(oxanorbornene)-g-PEG, poly(oxanorbornene)- g-PMMA, and graft block copolymers, poly(oxanorbornene)- g-(PS-b-PEG), poly(oxanorbornene)-g-(PS-b-PMMA), and poly(oxanorbornene)-g-(PS-b-PtBA), respectively. Diels–Alder click reaction efficiency for graft copolymerization was monitored by UV–vis spectroscopy. The dn/dc values of graft copolymers and graft block copolymers were experimentally obtained using a triple detection gel permeation chromatography and subsequently introduced to the software so as to give molecular weights, intrinsic viscosity ([η]) and hydrodynamic radius (Rh) values.
Açıklama
Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2011
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2011
Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2011
Anahtar kelimeler
anthrasen; Diels–Alder click reaksiyonu; aşı kopolimeri,
aşı blok kopolimeri; Grubbs’ ilk jenerasyon katalizi,
anthracene; Diels–Alder click reaction; graft copolymer,
graft block copolymer; Grubbs’ first-generation catalyst;;