Infrared spectra and compositional analysis of styrene/2‐ethylhexyl acrylate copolymers

Abstract

Compositional analysis of a series of free-radical emulsion polymerized styrene/2-ethylhexyl acrylate copolymers following close to random polymerization statistics was accomplished by elemental analysis, UV and IR. A satisfactory agreement was obtained between the three independent techniques. IR calibration curves were constructed based on sequence-independent infrared absorption bands determined by plotting peak intensities against the number fraction of each of the possible monad, dyad and triad structures in the copolymers. The intensities of the skeletal ring breathing vibration of styrene units at 1602 cm8 as well as the C -0 stretching vibration of the saturated ester group of 2-ethylhexyl acrylate units at 1 158 cm-' were shown to be representative of the copolymer com osition, whereas the position and shape of the carbonyl stretching band at 1730 cm-were shown to depend on both the composition and the monomer sequence distribution. A calibration curve not requiring the use of an internal thickness band was obtained by plotting the ratio of absorbances of the 1602 cm-' and the 1 158 cm-' peaks as a function of the mole ratio of the corresponding monomers in the copolymer.

Bioinspired dry adhesive: Poly(dimethylsiloxane) grafted with poly(2-ethylhexyl acrylate) brushes

“…'Unmodified PDMS R1' is notation for PDMS without initiator in reaction mixture, DP 242, DP 321, DP 352, DP 422 stand for degrees of polymerization of P2EHA of the values noted with the given numbers, when the ATRP reactions were carried out for 60 min, 120 min, 180 min and 240 min respectively. group of the polymer chains [34]. As seen in Fig.…”

Characterization of swelling behavior and elastomer properties of acrylate polymers containing 2-ethylhexyl and isobornyl esters

“…The FTIR spectra (750-3000 cm -1 ) of the monomers 2-EHA, IBOA and the mixture IBOA/2-EHA and their corresponding polymers are shown in Figure 3. Infrared spectra of monomers contain expected peaks, the band observed around 1720 cm -1 is assigned to the stretching vibration of conjugated ester -C=O; the bands observed around 1050 and 1200 cm -1 are attributed to the -CH2-O and acyl group (C-O) functions respectively [24]. Medium bands between 1375 and 1400 cm -1 correspond to asymmetric and symmetric bending vibration of methyl group and a characteristic band corresponding to the acrylic group (C=C) is observed at 810 cm -1 and 1635 cm -1 .…”

Determination of monomer reactivity ratios in styrene/2‐ethylhexylacrylate copolymer

“…Polymers having a low T g are used for pressure‐sensitive adhesives. Because the polymer becomes softer as the size of the ester group increases, n ‐butyl acrylate and 2‐ethylhexylacrylate are basic components of the acrylic latices 1, 2. The T g of poly(EHA) is approximately 223 K, while that of polystyrene is 373 K. Varying the concentration of styrene in the copolymer acts as a control for the final T g .…”

“…The literature available outlines various techniques to determine copolymer composition via elemental analysis 3. Additional techniques include 13 C‐ and 1 H‐NMR,12 IR spectroscopy,2 and UV spectrophotometry 13. In this work, the analysis is done by 1 H‐NMR.…”