Comprehensive analysis of stereoregularity and sequence distribution in 2-N-carbazolylethyl acrylate and methyl methacrylate copolymers by 2D NMR spectroscopy and their thermal studies

RETRACTED ARTICLE: Microstructure of poly(vinyl acetate)-block-poly(methyl acrylate-co-methyl methacrylate) block terpolymers. 2D NMR and thermal study

“…The effect of composition, sequence distribution and stereochemistry along the chemical bonds of copolymers was described in various papers [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] using two-dimensional HSQC, TOCSY, and HMBC NMR spectroscopy.…”

“…In another work, Brar et al 25 analyzed effect of composition, stereoregularity and sequence distribution of the synthesized 2-N-carbazolylethyl acrylate/methyl methacrylate copolymers using 1D ( 1 H, 13 C, DEPT-45, 90, 135) and 2D (HSQC, TOCSY, HMBC) NMR methods. The effect of MMA composition on flexibility and glass transition temperatures of the copolymers were also reported.…”

Study of chain sequence in the controlled radical telomerization of vinyl acetate with Co(acac)2 catalyst in bulk

“…The methine protons of the first VAc unit (b) in both molecules have a peak about 5.3-5.4 ppm. The peak at about 4.7-5.0 ppm is characteristic of the methine proton of the VAc repeating units in the backbone of polymer and telomer molecules which is higher in solution than bulk telomerization, telomers with CCl 3 α-end groups increases in solution telomerization [2][3][4][5][6][7][8][9][10][11][12][13][14].…”

“…The methyl group of acetate is at 2 ppm (g). Protons of the methylene for the repeating units (c), the end of chains (e) the methyl group of AIBN initiator(h) have a broad signals at 1.5 to about 2.0 ppm in 1 H NMR spectra [5,[8][9][10]. In telomerization reaction with different initial ratios of CDCl 3 …”

“…catalyst or initiator Y À ðM Þ n À Z Low molecular weight telomers are important because of the larger chain terminals and groups needed for reactions to be used in ATRP of other surface reactions. Free radical telomerization of VAc with CHCl 3 telogen has been done earlier [6][7][8][9]. The potential use of telomer as a block structure incorporated into the diblock or multi block copolymers of styrene, methyl methacrylate and methyl acrylate the importance of which increased by discovery of ATRP.…”