Heats of immersion and swelling of cation resins and related model systems in water and nonaqueous solvents

Wilks, Alan D.; Pietrzyk, Donald J.

doi:10.1021/ac60312a057

Cited by 34 publications

(40 citation statements)

References 32 publications

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“…A similar study was done with several different macroporous cation (H-and Na-form) and anion exchangers (Cl-and OH-form) in the same solvents. 15 ' Calorimetric measurements 50 and changes in the amplitude of an NMR signal 1 S 2 have been correlated to the rates at which solvents are taken up by cation exchangers. In the latter study the cation exchanger KU-2 containing different levels of cross-linking was used.…”

Section: Nonaqueous Solventsmentioning

confidence: 99%

“…Figure 2 illustrates the results found in the calorimetric studies. 50 Experimentally, the heat loss was determined as a function of time after immersion of the cation exchanger (dry state) into the solvent. The rate for heat evolution for the cation exchanger in DMF and DMSO was very slow (over 30 min).…”

Section: Nonaqueous Solventsmentioning

confidence: 99%

“…The original article should be consulted for a discussion of the experimental problems encountered and their effect on the overall error in the measurement. 50 Downloaded by [University of Cambridge] at 19:39 26 December 2014 D. Infrared Spectroscopy Infrared (IR) absorption of ion exchangers has been largely used in three ways. First, molecular structure of the exchanger can be examined, which also includes the investigation of solvation at the exchange site.…”

Section: B Electron Spin Resonancementioning

confidence: 99%

“…It would appear that this technique 50 would be a useful one for following solvent uptake in a more detailed kinetic examination. The more rapid uptake by the macroporous cation exchanger was also demonstrated in experiments designed to establish the optimum contact time between dry solvent and the cation exchanger solvent uptake experiments.…”

mentioning

confidence: 99%

See 3 more Smart Citations

Ion Exchanger-Solvent Interactions: Properties and Methodology

Pietrzyk¹,

Marcus²

1976

C R C Critical Reviews in Analytical Chemistry

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Section: Nonaqueous Solventsmentioning

confidence: 99%

Section: Nonaqueous Solventsmentioning

confidence: 99%

Section: B Electron Spin Resonancementioning

confidence: 99%

mentioning

confidence: 99%

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Ion Exchanger-Solvent Interactions: Properties and Methodology

Pietrzyk¹,

Marcus²

1976

C R C Critical Reviews in Analytical Chemistry

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“…SPE used for the extraction and separation of dissolved organic (DOM) has not been investigated much although the extraction of fuel oil and synthetic organic material has been studied [8] Amberlite XAD resins are available with a variety of polarities, XAD-1, XAD-2, XAD-4, XAD-7 and XAD-8, the potential of these resins for the extraction and separation of organic compounds from complex aquatic different samples has been studied. The adsorptive forces present when using amberlite XAD resins as adsorbent are primarily of the Van deer walls type [9,10]. Amberlite XAD-2 (pore size 9mm, particle size 0.3-1.2 mm) was used for isolation of phenolic compound from Australian honey [11].…”

Section: Introductionmentioning

confidence: 99%

Determination the Total Phenolic Contents in Some Foods Using Solid Phase Extraction

Al-Ameri¹,

Al-Shemari²

2017

JNUS

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Solid phase extraction with Amberlite XAD-8 resin was used for the determination of total phenolic contents in some foods using Folin-Ciocaltue's method and formation blue complex absorbance measured at λ max 765 nm. The effecting factors pH, time of extraction, number of the extraction batches and elution solvent was studied. The obtain results showed that the highest extraction occurs at optimal conditions, pH=2 at extraction time 10min. and using acetonitrile as elution solvent. The distribution coefficient Kd , for the adsorption and elution has been calculated for Gallic acid, 7-hydroxy coumarin. This resin prove to be capable for adsorption of these compound from aqueous samples, and acetonitrile was the supreme solvent for elution owing to superior polarity in addition to dielectric constant compare with ethanol and diethyl ether. The precision and accuracy of this method was found by analysis a laboratory made of Gallic acid samples, the statistical managements showed relative error ranged from ± 0.842 to 9.462%, mean error equal to -2.440, standard deviation 1.149, relative standard deviation not exceed 2.416%, and confidence limit 47.560±1.426. The effectively applied result of this method for determination of total phenolic contents in eight different type of food samples showed that the amount was varying from the highest value in dates which equal 10.466 mg GAE/10g sample and 1.160 mg GAE/10g sample in kiwi as lowest value.

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Thermal effects of interaction between macronet isoporous styrene polymers and solvents or precipitators for linear polystyrene

Tsyurupa

Volynskaya

Bel'chich

et al. 1983

J of Applied Polymer Sci

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SynopsisA study has been made of the heats of swelling of macronet isoporous polymers of styrene in toluene and methanol. The swelling of hypercrosslinked networks (degree of crosslinking 240%) is shown to be accompanied by liberation of large amounts of heat: 30 and 25 cal/g, respectively. The small difference in the heats of swelling in these media is indicative of small differences in the energy of dispersional interactions of exposed polystyrene chains with "good" and "poor" solvents. This conclusion is corroborated by calculations of the free energy of interaction between hypercrosslinked networks and organic solvents from the isotherms of sorption of their vapors. AG reaches high values (500-600 cal/mol) independently of the solvent nature.

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Heats of immersion and swelling of cation resins and related model systems in water and nonaqueous solvents

Cited by 34 publications

References 32 publications

Ion Exchanger-Solvent Interactions: Properties and Methodology

Ion Exchanger-Solvent Interactions: Properties and Methodology

Determination the Total Phenolic Contents in Some Foods Using Solid Phase Extraction

Thermal effects of interaction between macronet isoporous styrene polymers and solvents or precipitators for linear polystyrene

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