کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5211525 1382954 2008 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Nitroxide-mediated controlled/living radical copolymerizations with macromonomers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Nitroxide-mediated controlled/living radical copolymerizations with macromonomers
چکیده انگلیسی
Nitroxide-mediated polymerization (NMP) of styrene using N-tert-butyl-N-[1-diethylphosphono-(2,2-dimethylpropyl)]nitroxide (SG1) in the presence of poly(styrene) macromonomers containing two different 2-carboalkoxy-2-propenyl (CH2C(CO2R)CH2-: R = Et, tBu) ω-end groups proceeded in a controlled/living manner, as indicated by a continuous increase in the number average molecular weight with conversion giving values close to approximated theoretical values and efficient chain extension of the resultant branched polymers obtained. The polymerization rate decreased with increasing macromonomer content, but was independent of macromonomer ω-end group. Replacing styrene by α,β,β-trideuteriostyrene (St-d3) in copolymerizations with macromonomers allowed estimation of the reactivity ratio rSt-d3 to be 0.42 using 1H NMR analysis. This was used to obtain an estimate of the theoretical number average molecular weight as a function of conversion and to calculate the microstructure of the gradient branched copolymers obtained.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Reactive and Functional Polymers - Volume 68, Issue 3, March 2008, Pages 692-700
نویسندگان
, , , ,