Estimation of the Compatibility Between Poly(Methylmethacrylate) and Poly(Styrene Co Vinyl Phenol) Blends from Dilute Solution Measurements

Abstract

The compatibility of poly(methyl methacrylate) (PMMA) with poly(styrene-co-vinyl phenol) (PS-VPh) with two different contents of vinyl phenol, 5.8 and 7.2%, in dilute tetrahydrofuran solutions has been investigated by size exclusion chromatography and fluorescence spectroscopy at 258C. The chromatographic technique permits the evaluation of the preferential solvation at different PMMA/PS-VPh ratios. Changes in the fluorescence properties of PSVPh, caused by its association with PMMA, were used to obtain the fraction of copolymer bound to PMMA at diverse PMMA compositions. Both techniques agree quantitatively in every system, indicating that the association increases when the PMMA concentration and the content of the vinyl phenol in the copolymer increase.

Modelling the hydrogen-bonding interactions in a copolymer/biodegradable homopolymer blend through excess functions

“…In order to validate the abovementioned theoretical predictions on hydrogen-bonding specific interactions, we have experimentally monitored the association of PSVPh-x.x (x.x = 7.2; 5.8; 4.0; 3.2 and 2.0 mole% of vinylphenol) to PHB by fluorescence spectroscopy, a widely used and low time-consuming technique that has been proved to be a powerful tool for monitoring specific interactions. [49][50][51][52] In order to interpret the fluorescence experimental results, the simple binding model has been used which relies in two facts: (i) the fluorescence intensity depends linearly on the concentration of the two possible states of the polymer (free and bound); and (ii) the mass of the polymer must be conserved. Therefore, since the copolymer A is the fluorescent specie, the total concentration should be expressed by…”

Miscibility of Blends of Biodegradable Polymers and Copolymers with Different Plasticizers

“…[24,[26][27][28][29][30] The fluorescence measurements have been conducted both in the absence (blend in solid state) and in the presence of epichlorohydrin (ECH), a solvent with H-acceptor character (ether group). Another important part of the present work focuses on the theoretical interpretation of the experimental results by means of the Flory-Huggins (FH) and the Association Equilibria theory (AET) coupled theories for specific interactions.…”

“…The H‐bonding interactions occurring in the blends have been experimentally investigated using fluorescence spectroscopy, an effective tool provided that chromophore species in the system exist 24, 26–30. The fluorescence measurements have been conducted both in the absence (blend in solid state) and in the presence of epichlorohydrin (ECH), a solvent with H‐acceptor character (ether group).…”

Enzyme augmentation of a submerged anaerobic membrane bioreactor : effects on solids hydrolysis and membrane fouling

“…The undiluted enzyme blend contained approximately 19 U/mL of amylase, considerably higher than the protease activity of 10.4 U/mL, which could explicate the accumulation of amylase activity detected. instances, which occur when the refractive indices of the solutes are lower compared to those of the mobile phase (Figueruelo et al, 2006). Although it seems desirable to treat raw sewage containing organic particulates directly using AnMBRs, solids accumulation is expected due to complete solids retention, slow hydrolysis kinetics, and high operating SRTs.…”