Journal of Polymer and Biopolymer Physics Chemistry

Current Issue» Volume 2, Number 4 (2014)

Article

Acoustical Investigations of Molecular Interactions in Polymer Solution of Pan/Clay Nano Composites and Dmso

1Acoustics Research Centre, 4-215, Mississauga Valley Blvd., Mississauga, L5A 1Y7, ON, Canada

2Department of Physics, Rayat Bahra Institute of Engg. & Nano Technology, Hoshiarpur-146001, Punjab, India


Journal of Polymer and Biopolymer Physics Chemistry. 2014, 2(4), 73-77
DOI: 10.12691/jpbpc-2-4-3
Copyright © 2014 Science and Education Publishing

Cite this paper:
D. P. Singh, Arun Upmanyu. Acoustical Investigations of Molecular Interactions in Polymer Solution of Pan/Clay Nano Composites and Dmso. Journal of Polymer and Biopolymer Physics Chemistry. 2014; 2(4):73-77. doi: 10.12691/jpbpc-2-4-3.

Correspondence to: D.  P. Singh, Acoustics Research Centre, 4-215, Mississauga Valley Blvd., Mississauga, L5A 1Y7, ON, Canada. Email: drdpsn@hotmail.com

Abstract

Acoustical studies of intermolecular interactions in the polymer solution of PAN / clay nanocomposites and DMSO have been done at 30 degree Celsius using experimental ultrasonic velocity and density data taken from literature. Several acoustical and thermo-dynamical parameters such as isothermal compressibility, adiabatic compressibility, specific heat ratio, volume expansivity, surface tension, specific sound velocity, specific adiabatic compressibility, intermolecular free length, pseudo-Gruneisen parameter and classical absorption coefficient have been evaluated. Some elastic parameters such as Young modulus, shear modulus, bulk modulus and Poisson ratio have also been determined. Non linear parameters such as Moelwyn-Hughes parameter, reduced volume, reduced compressibility, Sharma’s constants, Huggins parameter, isobaric acoustical parameter, isochoric acoustical parameter, isothermal acoustical parameter, fractional free volume, repulsive exponent, thermo acoustical parameter such as A*and B*, Bayer’s non-linear parameter, internal pressure, isochoric thermo-acoustical parameter and isochoric temperature coefficient of internal pressure have also been calculated. The Moelwyn-Hughes parameter has been utilized to establish relation between the Bayer’s non linear parameter, internal pressure and Sharma constant. Relationships among the isobaric, isothermal and isochoric thermo-acoustical parameter have been studied and analyzed for PAN/clay nano composites. The obtained results have been compared with the experimental results as available in literature. The non-ideal behavior of the polymer solution has been explained in terms of its composition and variation of its acoustical and thermo-dynamical parameters. The present treatment offers a convenient method to investigate thermo-acoustic properties and anharmonic behavior of the system under study.

Keywords

References

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Article

The Determination of the Solubility Parameter (δ) and the Mark-Houwink Constants (K & α) of Food Grade Polyvinyl Acetate (PVAc)

1Department of Chemistry, Hofstra University, Hempstead, New York


Journal of Polymer and Biopolymer Physics Chemistry. 2014, 2(4), 67-72
DOI: 10.12691/jpbpc-2-4-2
Copyright © 2014 Science and Education Publishing

Cite this paper:
Ronald P. D’Amelia, Jaksha C. Tomic, William F. Nirode. The Determination of the Solubility Parameter (δ) and the Mark-Houwink Constants (K & α) of Food Grade Polyvinyl Acetate (PVAc). Journal of Polymer and Biopolymer Physics Chemistry. 2014; 2(4):67-72. doi: 10.12691/jpbpc-2-4-2.

Correspondence to: Ronald  P. D’Amelia, Department of Chemistry, Hofstra University, Hempstead, New York. Email: Ronald.P.Damelia@hofstra.edu

Abstract

Polyvinyl alkyl ester of carboxylic acids are a family of macromolecules in which the side chain esters (pendant groups) increase in molar mass and hydrophobicity and decrease in structural polarity as the number of carbons in the carboxylic acid increases. The most important polymer in this family is Polyvinyl Acetate (PVAc). The Solubility Parameter (δ) is a unique physical property of any polymeric material and can be a useful guide to understanding the miscibility or compatibility of two polymeric substances. It is therefore essential in working with polymeric blends of PVAc that the experimental solubility parameter be accurately and precisely known. We have experimentally determined the solubility parameter of food grade PVAc by measuring the intrinsic viscosity of several different molecular weight PVAc samples (ranging from 11K -75K Daltons) in four different solvents (acetone, methanol, tetrahydrofuran, toluene,) at 25°C using glass capillary viscometry. We also estimated the solubility parameter using the principles of group additivity contribution due to the atoms, groups and bonds present in PVAc based on the theories of Small, Hoy, and Van Krevelen. The Mark-Houwink constants for PVAC in the four solvents were also experimentally determined. Our experimentally determined solubility parameter was 9.35 (cal/cm3)1/2 which compared well with the computational values obtained by Hoy (9.56), Small (9.45) and Van Krevelen (9.27).

Keywords

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Article

Fabrication of Poly(Caprolactone) Nanofibers by Electrospinning

1Biomaterials and Tissue Engineering Laboratory, Department of Materials Engineering, Indian Institute of Science, Bangalore, India


Journal of Polymer and Biopolymer Physics Chemistry. 2014, 2(4), 62-66
DOI: 10.12691/jpbpc-2-4-1
Copyright © 2014 Science and Education Publishing

Cite this paper:
Athira K. S., Pallab Sanpui, Kaushik Chatterjee. Fabrication of Poly(Caprolactone) Nanofibers by Electrospinning. Journal of Polymer and Biopolymer Physics Chemistry. 2014; 2(4):62-66. doi: 10.12691/jpbpc-2-4-1.

Correspondence to: Athira  K. S., Biomaterials and Tissue Engineering Laboratory, Department of Materials Engineering, Indian Institute of Science, Bangalore, India. Email: athiraiisc@gmail.com

Abstract

Nanofibers at 466 ± 242 nm average diameter were fabricated due to phase separation caused by polarizability difference under static electric field. Fibre morphology was observed under a scanning electron microscopy. An insight into the process of electrospinning of the polymer, poly(caprolactone) was systematically evaluated and discussed the effects of the solution parameter of concentration of the polymer solution and process parameters of voltage, flow rate and drop height to fabricate poly(caprolactone) electrospun fibers with desired morphologies in this manuscript. Of all combinations, the best nanofibres with the fewest beads and finest fibers could be electrospun with a more uniform distribution in with a 15 kV applied voltage of on poly(caprolactone) solution of 12 per cent concentration at a 0.5 ml/h flow rate, from a drop height of 15 cm and the structure of nanofibres was found completely dry and stabilized.

Keywords

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