A thermodynamic analysis of specific interactions in homoblends of poly(styrene‐co‐4‐vinylpyridine) and poly(styrene‐co‐methacrylic acid)

Abstract

Miscibility and strong specific interactions that occurred within homoblends of poly(styrene-co-4-vinylpyridine) containing 15 mol % of 4-vinylpyridine (PS4VP15) and poly(styrene-co-methacrylic acid) containing 15 mol % of methacrylic acid (PSMA15) have been examined by Fourier Transform infrared spectroscopy and DSC. The observed positive deviation of the glass transition temperature of the blends from the linear average line, was analyzed by the frequently used theoretical conventional approaches including the one very recently proposed by Brostow. A better fit was obtained when this latter is used. A reasonable agreement with experimental values was also obtained when the theoretical fitting parameter free method developed by Coleman, is applied to predict the composition dependence of the T g of this system. A thermodynamic analysis of hydrogen bonding in this system was carried using the Painter-Coleman association model and the variation of the Gibbs function of mixing and its different contributions and corresponding phase diagrams as a function of temperature and composition were estimated. This analysis predicted PSMA15 to be miscible with PS4VP15 in the whole composition range up to 150 C. Above this temperature, a partial miscibility is predicted when the PS4VP15 is in excess. The DSC results are in agreement with these predictions. V V C 2009 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 47: [923][924][925][926][927][928][929][930][931] 2009

Thermal Stability of Interpolymer Complexes Based on Poly(styrene‐co‐4‐vinylpyridine) and Poly(styrene‐co‐itaconic Acid)

“…We have previously incorporated within various polymers by copolymerization, proton donors such as acrylic acid or methacrylic acid and have mixed such copolymers with different basic copolymers to prepare interpolymer complexes. [7][8][9][10] Itaconic acid, a monomer obtained from renewable resources at low cost, possesses two carboxylic acid groups. It might be of interest to substitute the above protondonor monomers with this acid, expected to produce highly functionalized copolymers and to improve the possibility of developing specific interactions with proton-acceptors.…”

“…We have previously incorporated within various polymers by copolymerization, proton donors such as acrylic acid or methacrylic acid and have mixed such copolymers with different basic copolymers to prepare interpolymer complexes …”

Phase Behavior and Thermal Analyses of Novel Blends Based on Poly(Styrene‐Co‐Itaconic Acid) and Poly(Ethylacrylate‐Co‐4‐Vinylpyridine)

“…A great interest has been devoted to the development of nanostructured polymeric blends of outstanding properties. [18][19][20] Due to several factors reported in the literature, [21][22][23] not all the specific groups within the polymer chains get involved in the miscibility of polymer blends or in the elaboration of interpolymer complexes. As we have previously reported, [24,25] it is interesting to investigate the extent of intermolecular interactions to obtain materials of significantly improved properties.…”

Miscibility of Carboxy‐Terminated Polystyrene/Poly[2‐(N,N‐dimethylamino)ethyl methacrylate] Blends

“…[1] Well-known miscible polymer blends are poly(methyl methacrylate) (PMMA)/poly(vinylphenol) (PVPh) and PMMA/poly(styrene-co-vinylphenol), in which the hydrogen bonding interaction between the carbonyl and hydroxyl groups contributes to the miscibility. [2][3][4][5][6][7][8][9][10][11][12][13][14] Proton-donating polymers such as PVPh, poly(methacrylic acid) (PMA), and poly(acrylic acid) (PAA) form polymer complexes or miscible mixtures with proton-accepting polymers, e.g., poly(vinylpyridine), [15][16][17][18][19] poly Ndimethylamino)ethyl methacrylate] (PDMAEMA), [20][21][22][23][24] poly(N,N-dimethylacrylamide), [25][26][27] poly(N-methyl-3-piperidinemethyl methacrylate), [28] poly(N-methyl-4-piperidyl methacrylate), [29] poly(vinylimidazole), [30,31] and poly(N-acryloyl-N 0 -methylpiperazine). [32] PDMAEMA is a typical complex forming material combining with acidic polymer/copolymers [22,24] by plural interactions between carboxylic acid and ester/amino groups.…”