Polymers based on benzyl methacrylate: Synthesis via atom transfer radical polymerization, characterization, and thermal stabilities

Abstract

Copolymerization and homopolymerization of benzyl methacrylate (BMA) and ethyl methacrylate (EMA) by the atom transfer radical polymerization method (ATRP) were performed at 90°C. ATRP of BMA was also carried out at 80, 100, and 110°C. The number-average molecular weight (M n ) and polydispersities decreased with temperature. When BMA units increased in the copolymer system, the M n values and polydispersities decreased (1.63 Ͻ M w /M n Ͻ 1.13). The homopolymers and poly(BMAco-EMA) were characterized by Fourier transform infrared (FTIR), 1 H and 13 C NMR, and gel permeation chromatography (GPC) techniques. The compositions of the copolymers were calculated from 1 H NMR spectra. For the atom transfer radical copolymerization system, their monomer reactivity ratios were obtained by using the Kelen-Tü dös equation, as r 1 ϭ 0.812, r 2 ϭ 1.162 (r 1 is the monomer reactivity ratio of BMA). The initial decomposition temperatures of the resultant copolymers decrease with an increasing mol fraction of BMA, which indicates that the heat resistance of the copolymer has been improved by decreasing the BMA units. Blends of poly(BMA) and poly(EMA) obtained via the ATRP method have been prepared by casting films from a dichlorormethane solution. The blends have been characterized by differential scanning calorimetry and thermogravimetry. The measurements were comparable with those of copolymers synthesized.

Starch-g-poly(benzyl methacrylate) copolymers

“…The differences between starch FTIR spectrum and the FTIR spectra of copolymers are clearly observed. FTIR spectrum of starch shows the characteristic bands corresponding to the stretching vibrations of OH groups (the region of 3000-3600 cm -1 ), the stretching vibrations of C-H (at 2840-2930 cm -1 ), the stretching vibrations of C-O-H and the C-O-C (the region of 998-1150 cm -1 ) [34,35]. However, on the FTIR spectra of copolymers the appearance of additional bands is indicated.…”

Synthesis and Characterization of Lactone Functional Macromonomers by End Group Deactivation and Their Use in Miktoarm Star Polymer

“…It may be suggested that a lactone ring forms by means of removing benzyl bromide at the chain end, as suggested in Scheme 2. This band is not observed in that of poly(BMA) synthesized under free-radical polymerization conditions [22]. Designed miktoarm star shaped copolymers made of poly[(-caprolacton)(-PCL)-cobenzyl methacrylate(BMA)] were synthesized by combining ring-opening polymerization (ROP), as was illustrated in Scheme 3.…”

“…Phloroglucin dihydrate (Aldrich) was dryed to remove dihydrat in vacuo (at 2 mmHg) at 120˚C. Benzyl methacrylate (BMA) was prepared by aid of literature [22]. So, BMA was synthesized by the reaction of benzyl alcohol and methacryloyl chloride at 60˚C -70˚C by using potassium carbonate.…”

“…THF was used as eluent at a flow rate of 1.0 mL/min. nomer was carried out according to procedure recorded in literatur [22].…”

Statistical Copolymers Of Benzyl Methacrylate And Diethylaminoethyl Methacrylate: Monomer Reactivity Ratios And Thermal Properties

“…The samples have typical high molecular weights and molecular weight distributions in the range expected for conventional radical polymerization. Compared with statistical copolymers of BzMA prepared by radical polymerization in bulk [32] or PBzMA and statistical copolymers, prepared by atom transfer radical polymerization (ATRP) [33] it is obvious that in the present study the solution copolymerization Synthesis of the statistical copolymers. leads to rather narrow distributions.…”