کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1410194 1501810 2011 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
1D and 2D NMR studies of isobornyl acrylate – Methyl methacrylate copolymers
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
1D and 2D NMR studies of isobornyl acrylate – Methyl methacrylate copolymers
چکیده انگلیسی

Isobornyl acrylate – methyl methacrylate (B/M) copolymers of different compositions were synthesized by atom transfer radical polymerization (ATRP) using methyl-2-bromopropionate as an initiator and PMDETA copper complex as catalyst under nitrogen atmosphere at 70 °C. 1H NMR spectrum was used to determine the compositions of copolymer. The copolymer compositions were then used to determine the reactivity ratios of monomers. Reactivity ratios of co-monomers in B/M copolymer, determined from linear Kelen–Tudos method (KT) and non linear Error-in-Variable Method (EVM), are rB = 0.41 ± 0.11, rM = 1.11 ± 0.33 and rB = 0.52, rM = 1.31 respectively. The complete resonance assignments of 1H and 13C{1H} NMR spectra were carried out with the help of Distortion less Enhancement by Polarization Transfer (DEPT), two-dimensional Heteronuclear Single Quantum Coherence (HSQC). 2D HSQC assignments were further confirmed by 2D Total Correlation Spectroscopy (TOCSY). The carbonyl carbon of B and M units and methyl carbon of M unit were assigned up to triad compositional and configurational sequences whereas β-methylene carbons were assigned up to tetrad compositional and configurational sequences. Similarly the methine carbon of B unit was assigned up to pentad level. 1,3 and 1,4 bond order couplings of carbonyl carbon and quaternary carbon resonances with methine, methylene and methyl protons were studied in detail using 2D Hetero Nuclear Multiple Bond Correlation (HMBC) spectra.


► Reactivity ratio determined for isobornyl acrylate–methyl methacrylate copolymers.
► 13C{1H} NMR studied.
► 2D HSQC and TOCSY NMR studied.
► 2D HMBC NMR studied.
► Carbonyl carbon resonances studied.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Structure - Volume 1004, Issues 1–3, 12 October 2011, Pages 121–130
نویسندگان
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