Publications

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Volume 5, Issue 1, (January – February 2016)

 

Solvent Transport through Oil Palm Fibre filled Low Density Polyeth-ylene Composites

Original Research

Journal of Chemistry and Materials Research Vol. 5 (1), 2016, 2–12

H.C. Obasi*, B.C. Aharanwa, F.O. Aguele, P.C. Uzoma, C. Nwapa, U.L. Ezeamaku, I.C Chukwujike

 

Abstract

The transport behaviour of toluene through oil palm fibre (OPF) filled low density polyethylene (LDPE) composites have been investigated in the temperature range 313–353 K. The effects of filler content, particle size and temperature on the transport behaviour of solvent through OPF/LDPE composites were studied. It has been observed that all the systems follow Fickian mode of transport on increasing temperature. The effect of alkali treatment on solvent uptake and swelling parameters was also analyzed. The estimated Arrhenius activation energies for the processes of diffusion, and permeation indicated that the activation energies showed no particular trend with filler content, filler treatment and particle size.The enthalpies, and entropies of sorption for the solvent have been investigated and the change in the estimated free energies of sorption were all positive; an indication of the non-spontaneity of the solubility of oil palm fibre in the aromatic solvent at 313 K.The first order kinetic model has been used to follow the kinetics of diffusion of solvent through OPF/LDPE composites.

 

Keywords: Oil palm fibre, sorption, activation energy, swelling parameters, first order rate constant, alkali treatment.

 

Received

Received in revised
  Accepted
01 March 2016
-
29 March 2016
 

Study of Molecular Interactions in Solutions of Dihydropyridine Derivatives in N, N-Dimethylformamide at Different Temperatures

Original Research

Journal of Chemistry and Materials Research Vol. 5 (1), 2016, 13–24

Shipra Baluja* and Rahul Talaviya

 

Abstract

Some newdihydropyridine derivatives have been synthesized and their characterization was done by FT-IR, 1H NMR and mass spectral data. The density, ultrasonic velocity and viscosity of thesecompounds have been measured in N,N-dimethylformamideover a wide range of concentration at different temperatures(298.15, 308.15 and 318.15K). From these experimental data, various acoustical parameters such as acoustic impedance (Z), adiabatic compressibility (ks), intermolecular free length (Lf), Rao’s molar sound function (Rm), molar compressibility (W), Van der Waals constant (b), solvation number (Sn), etc. have been calculated in order to understand the molecular interactions in the studied solutions.Further,some apparent molar parameters are also calculated and were fitted toGucker’s and Masson’s relations. The evaluated parameters help to understand the behavior of synthesized compounds in DMF solutions.

 

Keywords: Dihydropyridine derivatives, ultrasonic velocity, acoustical parameters, N,N-dimethylformamide.

 

Received
  Received in revised
Accepted
02 March 2016
-
08 April 2016