Stereochemical and Compositional Assignments of trans-4-Methacryloyloxyzobenzene-Methyl Methacrylate Copolymers by One-and Two-Dimensional NMR Spectroscopy

摘要

The microstructure of trans-4-methacryloyloxyazobenzene-methyl methacrylate copolymers prepared by solution polymerization process using AIBN as initiator is analyzed by one-and two-dimensional spectroscopy.Sequence distribution was calculated from the ~(13)C~(1H)-NMR spectra of the copolymers.Comonomer reactivity ratios were determined using the Kelen-Tudos and the nonlinear error-in--variables methods are #UPSILON#_A =1.14 +- 0.08 and #YOSUKIB#_M =0.51 +- 0.03;#UPSILON#_A =1.13 +0 0.1 and #UPSILON#_M = 0.500 +- 0.04,respectively.The sequence distribution of A- and M-centered triads determined from ~(13)C(~1H)-NMR spectra of copolymer is in good agreement with triad concentration calculated from a statistical model.The 2-D heteronuclear single-quantum correlation and correlated spectroscopy (TOCSY) was used to analyze the complex ~1H-NMR spec trum.