کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5190231 | 1381201 | 2006 | 8 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Physicochemical characterization of poly(tert-butyl acrylate-b-methyl methacrylate) prepared with atom transfer radical polymerization by inverse gas chromatography
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موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Poly(tert-butyl acrylate) (PtBuA) was synthesized by atom transfer radical polymerization (ATRP) using methyl-2-bromo propionate (MBP) as an initiator in bulk at 80 °C. The successive ATRP of methyl methacrylate in diphenyl ether at 80 °C using previously obtained PtBuA as a macroinitiator led to formation of poly(tert-butyl acrylate-b-methyl methacrylate) (poly(tBuA-b-MMA)). The synthesized macroinitiator and block copolymer have controlled molecular weight and low polydispersity (Mw/Mn<1.2). The block copolymer was characterized by gel permeation chromatography (GPC) and 1H NMR. The retention diagrams of poly(tBuA-b-MMA) for some aliphatic esters and aromatic hydrocarbons were obtained using inverse gas chromatography (IGC) technique. The glass transition temperatures, Tgs of poly(tBuA-b-MMA) were determined by both differential scanning calorimeter (DSC) and IGC. It was observed that the block copolymer represents three Tgs at 50, 75 and 100 °C by IGC although it represents only one Tg at 71 °C by DSC. After the column was quenched from 180 to 0 °C, the Tg at 100 °C shifted to 105 °C however others did not change. Specific retention volumes, Vg0 and the thermodynamical polymer-solvent interaction parameters such as Flory-Huggins, Ï12â, equation-of-state, Ï12* and effective exchange energy, Xeff were found for all studied solvents. Partial molar heat of sorption, ÎH¯1,sorp, partial molar heat of mixing, ÎH¯1â and molar heat of vaporization, ÎHv, were determined. In addition, the solubility parameter of the corresponding block copolymer, δ2 was determined as 11.0 (cal/cm3)1/2 at 25 °C.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 47, Issue 1, 3 January 2006, Pages 132-139
Journal: Polymer - Volume 47, Issue 1, 3 January 2006, Pages 132-139
نویسندگان
Dolunay Sakar, Tuba Erdogan, Ozlem Cankurtaran, Gurkan Hizal, Ferdane Karaman, Umit Tunca,