Dispersive Surface Energy and Acid-Base Parameters of Tosylate Functionalized Poly(ethylene glycol) via Inverse Gas Chromatography

Abstract

An inverse gas chromatographic (IGC) study of the sorption properties of poly(ethylene glycol) modified with tosylate (PEG-TOS) was presented. PEG-TOS was synthesized via the tosylation of the corresponding poly(ethylene glycol) (PEG) withp-toluenesulfonyl chloride in the basic medium. The synthesized PEG-Tos was characterized by FTIR-ATR and1HNMR techniques. The retention diagrams of n-hexane, n-heptane, n-octane, n-nonane, n-decane, dichloromethane, chloroform, acetone, tetrahydrofuran, ethyl acetate, and ethanol on the PEG and PEG-Tos were plotted at temperatures in K between 303 and 373 by inverse gas chromatography technique. The dispersive component of the surface-free energy,γSD, of studied adsorbent surface was estimated using retention times of different nonpolar organics in the infinite dilution region. Thermodynamic parameters of adsorption (free energy,ΔGAS, enthalpy,ΔHAS, and entropy,ΔSAS), dispersive components of the surface energies,γSD, and the acid,KA, and base,KD, constants for the PEG and PEG-Tos were calculated and the results were discussed.

Pegylated Polybenzoxazine Networks with Increased Thermal Stability from Miscible Blends of Tosylated Poly(ethylene glycol) and a Benzoxazine Monomer

“…The similar blend range for miscibility between BA-a and mPEGOTs and mPEGOH suggests that the end-group of mPEGOTs is not important for compatibilizing the solute. 57 Huang et al have previously observed a similar affect for PEG blended with a similar benzoxazine monomer. 58 Also evident in Figure 1a is a significant decrease in the T m of mPEGOH 2000 with increasing BA-a content in its blends.…”

“…Similarly, BA-a/mPEGOTs 900 blends with an overall PEG content ≤ 60 wt % exhibit complete melt suppression. The similar blend range for miscibility between BA-a and mPEGOTs and mPEGOH suggests that the end-group of mPEGOTs is not important for compatibilizing the solute . Huang et al have previously observed a similar affect for PEG blended with a similar benzoxazine monomer .…”

Thermal Surface Properties, London Dispersive and Polar Surface Energy of Graphene and Carbon Materials Using Inverse Gas Chromatography at Infinite Dilution

“…The lack of information and the different gaps encountered in this research area guided the objective of our study for accurate determination of the surface properties of graphene and carbon materials, which are required to obtain real guidance for the design and manufacturing of graphene-based biomaterials, medical instruments, structural composites, electronics, and renewable energy devices [ 20 ]. The present work is thus devoted to determination of the thermal surface properties, the London dispersive and polar acid-base surface energies, and the Lewis acid-base parameters of graphene and carbon materials as a function of the temperature by using the IGC technique [ 28 , 29 , 30 , 31 , 32 , 33 , 34 , 35 , 36 , 37 , 38 , 39 , 40 , 41 , 42 , 43 , 44 , 45 , 46 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65 , 66 , 67 , 68 , 69 , 70 , 71 , 72 , 73 ] at infinite dilution and applyi...…”

The Effect of Temperature on the London Dispersive and Lewis Acid-Base Surface Energies of Polymethyl Methacrylate Adsorbed on Silica by Inverse Gas Chromatography

“…Kołodziejek et al [33] studied the relationship between surface properties determined by inverse gas chromatography and ibuprofen release from hybrid materials based on fumed silica, whereas Ho et al [34][35][36] studied the surface energy heterogeneity of crystals with IGC. Many authors studied the surface energies of some polymers, such as tosylate functionalized poly(ethylene glycol) [37], polybutadiene/fillers [38], poly(2,2,3,3,3-pentafluoropropyl methacrylate) [39], and hyperbranched poly(ester amide) [40].…”

“…The non-dispersive component can be also symbolized by the total polar contribution γ p s of the surface energy. In this paper, we used the IGC technique [35][36][37][38][39][40] at infinite dilution to determine the dispersive γ d s (T) and polar γ p s (T) components of the surface energy, as well as Lewis's acid-base surface energies of poly(methyl methacrylate) (PMMA) adsorbed on silica at different recovery fractions as a function of the temperature using our new approach based on the Hamieh thermal model [59][60][61] that gave the variations of the surface area of adsorbed organic molecules as a function of the temperature.…”