Evaluation of Huggins' Constant, Kraemer's Constant and Viscosity Concentration Coefficient of Polymer Dextran in Urea, Glycine and Glucose

Mahapatra, A. P.; Samal, Rajani K.; Samal, R. N.; Roy, G. S.

doi:10.1080/00319100108030337

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…That means 0/10 and 2/8 have poor solvation and other compositions starting from 4/6 have good solvation. Another point is that the value of k -k ′ should be nearer to 0.5 if solvent shows identical trends [27] . In our case, the deviation is too large for the 0/10 and 2/8 compositions as compared with other compositions.…”

Section: Characterization Of Ca and All Compositions Of Nocc/ca By Ftirmentioning

confidence: 99%

Dilute solution viscometry study on the miscibility of N,O-carboxymethyl chitosan-cellulose acetate blends

Boricha

Murthy

2011

Journal of Polymer Engineering

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Dilute solution viscometry method is used for studying viscosity behavior of newly prepared N , O -carboxymethyl chitosan (NOCC), cellulose acetate (CA), and their blends at different compositions (0/10, 2/8, 4/6, 5/5, 6/4, 8/2, 10/0). In this method, reduced viscosity ( η sp / c ) and inherent viscosity (ln η rel / c ) of the given polymer sample have been determined by measuring the fl ow time of the polymer sample in acetone solvent. Huggins ( k ) and Kraemer coeffi cients ( k ′ ) for given polymer-solvent system are calculated from the extrapolation of plots ( η sp / c ) versus ( c ) and (ln η rel / c ) versus ( c ). The miscibility of this polymer system is determined using different criteria such as ∆ b , ∆ b ′ , b 12 exp , interaction parameter ∆ [ η ], thermodynamic parameter α , and modifi ed thermodynamic parameter β . Based on the positive or negative sign of this criteria, miscibility of the polymer system is investigated. The results of the dilute solution viscometry method suggested that the NOCC/CA blends are miscible at the compositions range of 4/6, 5/5, 6/4, and 8/2 and completely immiscible at the 2/8 composition. The results are also supported by Fourier transform infrared analyses of all the compositions.

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Section: Characterization Of Ca and All Compositions Of Nocc/ca By Ftirmentioning

confidence: 99%

Dilute solution viscometry study on the miscibility of N,O-carboxymethyl chitosan-cellulose acetate blends

Boricha

Murthy

2011

Journal of Polymer Engineering

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Effect of epoxidized palm oil on the mechanical and morphological properties of a PLA–PCL blend

et al. 2013

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Highly dispersed nanocomposites based on polymer/inorganic hybrids and nickel nanoparticles: the role of the matrix structure in the process of in situ formation

Zheltonozhskaya¹,

Permyakova²,

Klepko³

et al. 2023

Polim. z.

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A series of polymer/inorganic hybrids based on silica sol and polyacrylamide (SiO2-g-PAAm) with different number and length of PAAm chains was obtained by radical graft polymerization of acrylamide from the surface of SiO2. The main molecular and structural parameters of the hybrids, such as the chemical composition, average radius and charge of SiO2 particles, the number of grafts per one particle and their molecular weight, the average diameter and hydrodynamic volume of hybrid particles, and the thickness of the PAA layer, were determined. For this, elemental analysis, DTGA, static light scattering, viscometry, potentiometric titration, and TEM were used. The functional properties of hybrids as hydrophilic matrices in the in situ synthesis of nickel nanoparticles by borohydride reduction of metal ions from the Ni(NO3)2·6H20 salt in an aqueous medium have been studied. Using the method of UV-Vis spectroscopy and the developed original approach, the kinetics and efficiency of the formation of NiNPs in hybrid solutions were characterized, depending on the structure and concentration of the hybrid matrices and the concentration of the metal salt. An increase in the rate of accumulation and yield of NiNPs in solutions of all hybrids was found with an increase in salt concentration in the range of 0,010-0,078 kg·m-3, as well as a predominant decrease in the reaction rate with an increase in the concentration of hybrid matrices from 0,5 to 2,0 kg·m-3. It was shown that the structure of the hybrid matrices, determined by the number and length of PAAm chains, as well as the permeability of the grafted polymer layer, was one of the key factors affecting the formation rate and yield of NiNPs. It provided greater or lesser accessibility of the active groups of the "corona" and the inorganic "core" for metal ions and reducing agent molecules. Morphological studies of purified reduction products were carried out by TEM. Based on them, the main structural elements of highly dispersed NiNPs/SiO2-g-PAAm nanocomposites were established – swollen hairy particles of hybrids with small amorphous NiNPs (1,7±0,8 nm) included in the polymer "corona".

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Evaluation of Huggins' Constant, Kraemer's Constant and Viscosity Concentration Coefficient of Polymer Dextran in Urea, Glycine and Glucose

Cited by 3 publications

References 7 publications

Dilute solution viscometry study on the miscibility of N,O-carboxymethyl chitosan-cellulose acetate blends

Dilute solution viscometry study on the miscibility of N,O-carboxymethyl chitosan-cellulose acetate blends

Effect of epoxidized palm oil on the mechanical and morphological properties of a PLA–PCL blend

Highly dispersed nanocomposites based on polymer/inorganic hybrids and nickel nanoparticles: the role of the matrix structure in the process of in situ formation

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