The totally miscible in ternary hydrogen‐bonded polymer blend of poly(vinyl phenol)/phenoxy/phenolic

Abstract

The individual binary polymer blends of phenolic/phenoxy, phenolic/poly(vinyl phenol) (PVPh), and phenoxy/PVPh have specific interaction through intermolecular hydrogen bonding of hydroxyl-hydroxyl group to form homogeneous miscible phase. In addition, the miscibility and hydrogen bonding behaviors of ternary hydrogen bond blends of phenolic/phenoxy/PVPh were investigated by using differential scanning calorimetry (DSC), Fourier transform infrared spectroscopy, and optical microscopy. According to the DSC analysis, every composition of the ternary blend shows single glass transition temperature (T g ), indicating that this ternary hydrogenbonded blend is totally miscible. The interassociation equilibrium constant between each binary blend was calculated from the appropriate model compounds. The interassociation equilibrium constant (K A ) of each individually binary blend is higher than any self-association equilibrium constant (K B ), resulting in the hydroxyl group tending to form interassociation hydrogen bond. Photographs of optical microscopy show this ternary blend possess lower critical solution temperature (LCST) phase diagram.

Resonance Effect on Self- and Inter-Association Hydrogen Bonding Interaction of Polymer Blend

“…In addition to FTIR, evidence on interactions in the blends can also be obtained from solid-state NMR spectroscopy, as demonstrated by changes in chemical shift and/or line shape. Figure 13 shows the selected 13 C CP/MAS spectra of various PNCHAA/P4VP and PNPAA/ P4VP blends. Five peaks are also observed for pure P4VP where the peak at δ ) 123.9 ppm corresponds to the pyridine carbon atom (C-12).…”

“…10 The dimension of mixing smaller than 20 nm can be obtained through measurement of the spin-lattice relaxation time in the rotating frame (T 1F H ). 10 The T 1F H values of the blends were measured through the delayed-contact 13 C CP/MAS experiments. The (T 1F H ) values are calculated from eq 9:…”

“…1 H NMR spectra of these homopolymers were recorded on a Bruker ARX300 spectrometer using CDCl 3 as the solvent. High-resolution solid-state 13 C NMR spectroscopy experiments were performed at 25 °C using a Bruker DSX-400 spectrometer operating at a resonance frequency of 100.47 MHz. High-resolution solid-state 13 C NMR spectra were acquired using the cross-polarization (CP)/magic-angle spinning (MAS)/high-power dipolar decoupling (DD) technique, with a 90 °C pulse width of 3.9 µs, a pulse delay time of 3 s, an acquisition time of 30 ms, and 2048 scans.…”

“…Specific interactions between various polymers containing different structures have been intensively reported, especially for those in hydrogen bonding blend systems such as homopolymer/homopolymer, [1][2][3][4] homopolymer/copolymer, [5][6][7][8][9][10][11] ternary blends, [12][13][14] and polymer nanocomposites. 15,16 Most studies have concentrated on the understanding of structural effects on self-and inter-associative hydrogen bonding in polymer blends.…”

“…Specific interactions between various polymers containing different structures have been intensively reported, especially for those in hydrogen bonding blend systems such as homopolymer/homopolymer, − homopolymer/copolymer, − ternary blends, − and polymer nanocomposites. , Most studies have concentrated on the understanding of structural effects on self- and inter-associative hydrogen bonding in polymer blends. The accessibility of functional groups in hydrogen-bonded polymer blends can significantly affect the intramolecular screening effects which are a direct consequence of chain connectivity. − Moreover, the presence of bulky side groups can also reduce the accessibility of the functional groups as functional group accessibility effects.…”