کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1405389 | 1501733 | 2015 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
31P NMR spectroscopy for quantification of moieties present in the backbone of poly(aryloxycyclotriphosphazene)
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A new method for semi-quantification of the moieties present in the back bone of poly(aryloxycyclotriphosphazene) using 31P NMR spectroscopy was proposed based on integral values and number of phosphorus atoms of the representative resonance. Poly(m-phenylenedioxy)cyclotriphosphazenes with a different degree of crosslink were synthesized from the reaction of hexachlorocyclotriphosphazene (NPCl2)3 with 1,3-benzenediol and triethylamine in five different mole ratios, afforded structurally different products designated as PI-PV. The structures of these products and their isomeric compositions were identified based on the correlation between chemical shifts and JPP coupling constants. The data clearly demonstrated presence of a mixture contains different substitution modes and isomers. When the mole ratio of the reactants is in equal amount, the non-geminal mode is predominantly formed of about 89.03% and also geminal mode of about 10.95% has been observed. The formation of the later increased to 52.19% when the ratio of substituent was raised at the tris and tetra stage of chlorine replacement.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1084, 15 March 2015, Pages 148-154
Journal: Journal of Molecular Structure - Volume 1084, 15 March 2015, Pages 148-154
نویسندگان
Salah Mahdi Al-Shukri,