On the role of intermolecular hydrogen bonding in miscible polymer blends

Abstract

The results of a Fourier transform infrared study of poly(vinylphenol) blends with poly (vinyl acetate) and ethylene-vinyl acetate copolymers are presented. Infrared bands attributed to intermolecular hydrogen-bonding interactions involving the phenolic hydroxyl group with the acetate carbonyl group are identified. A quantitative measure of the fraction of hydrogen-bonded carbonyl groups in the blends has been obtained as a function of temperature. The results are considered in terms of an effective equilibrium constant, and an estimation of the strength of the intermolecular interaction has been gained. Ramifications concerning polymer-polymer miscibility and the effect of temperature, solvent, and glass transition temperature on the structure of polymer blends are discussed.

Phosphonyl/hydroxyl hydrogen bonding-induced miscibility of poly(arylene ether phosphine oxide/sulfone) statistical copolymers with poly(hydroxy ether) (phenoxy resin): Synthesis and characterization

“…4 The formation of hydrogen bonds requires proton-donating groups, such as hydroxyl, carboxyl, amine, or amide groups, and proton-accepting groups, such as carbonyl, ether, hydroxyl group oxygen atoms,or amine and heterocyclic compound nitrogen atoms. Examples of miscible blends fostered by such strong specific interactions include (1) phenoxy with poly(butylene/terephthalate), 5 poly(2-vinylpyridine), and poly(4-vinylpyridine) 6 ; (2) poly(4-vinylphenol) with vinylacetate, 7 poly(arylate)s, 8 or poly(vinylpyrrolidone) 9 ; and (3) poly(benzimidazole) with polyimides or poly(bisphenol-A carbonate). 10 Hydrogen bonding is believed to be responsible for the miscibility of these polymer blends, as well as crucial for the strengthening of polymer-polymer interfaces.…”

Miscibility of polymer blends of poly(styrene-co-4-hydroxystyrene) with bisphenol-A polycarbonate

“…The miscible window is estimated to lie roughly within a region of 45-75 mol % hydroxyl groups in the copolymer. As hydrogen-bonding is a quite common phenomenon in blends consisting of PHS and other proton-acceptor polymers, such as polyesters, 22 polyamides, 23 and polyacrylates, 24 the H-bonding-sensitive technique, FTIR, was used to inspect the possibility of H-bonding interactions between the carbonyl groups of BAPC and the hydroxyl groups of PSHS. Examination of the spectra in Figure 1 shows that no obvious band shift of the carbonyl of BAPC at 1774 cm Ϫ1 can be detected after blending with PSHS samples, which is a common feature associated with the presence of H-bonding.…”

Creation and control of new morphologies via supramacromolecular self-assembly

“…37,38 Block copolymers for this study were prepared by anionic polymerizations in tetrahydrofuran, 39,40 whereas an H homopolymer was also synthesized by an anionic polymerization of poly(4-tert-butoxystyrene) followed by a hydrolysis reaction. [41][42][43][44] Sample films were obtained by casting a solvent from the solution of tetrahydrofuran. Four images at the bottom of Figure 1 show the morphology change of the polystyrene-b-poly(2-vinylpyridine) (SP-73), whose molecular weight is 130 kDa and the volume fraction of the polystyrene (S) block is 0.67, upon the addition of H with a molecular weight of 14 kDa.…”