Viscoelastic Constants of a Short‐Chain Polymer

1964 ◽  
Vol 36 (5) ◽  
pp. 953-960 ◽  
Author(s):  
J. L. Hunter ◽  
C. J. Montrose ◽  
J. H. Shively
Keyword(s):  
Short Chain ◽  
Chain Polymer ◽  
Viscoelastic Constants

Effect of HCl Concentration and Acetone Washing on the Dielectric and Conduction Properties of Polyaniline Salts

2021 ◽  
Vol 14 ◽  
Author(s):  
Jayashree Mohanty ◽  
S.R. Mishra ◽  
Tanmaya Badapanda ◽  
S. Anwar
Keyword(s):  
Electrical Conductivity ◽  
Electrical Properties ◽  
Acid Concentration ◽  
Charge Carriers ◽  
Short Chain ◽  
Water Medium ◽  
Distilled Water ◽  
Chain Polymer ◽  
Pani Salt ◽  
Long Chain

Aims: The aim of the work is to study the effect of acid concentration and acetone washing on electrical properties of Polyaniline (PANI) salts prepared through chemically oxidative polymerization. Background: The frequency dependent conductivity and dielectric permittivity provide important information on the electrical properties of conducting polymers which gives information regarding their utility in electronic applications. Objective: Hence, the present study is based on the comparative the electrical properties study (dielectric and electrical conductivity) of PANI salts prepared in two different media like water and 1M HCl along with study regarding effect acetone washing on the said electrical properties of the polymer samples. Methods: PANI salts are synthesized through chemical oxidative polymerisation of aniline hydrochloride with the oxidant ammonium persulphate in two different media like water and 1M HCl. One part of the PANI salt samples were washed with distilled water after synthesis and another part of the polymer samples were washed with distilled water followed by acetone to study the effect of acetone washing on the electrical properties of polymer samples. Results: Non-acetone washed PANI salt prepared in water medium shows the highest dielectric as well as electrical conductivity due to the increased charge carriers provided both by long chain polymer as well as short chain oligomers. When the acid concentration is increased to 1M there may be loss of protons accompanied by pairing of free radicals to form quinoimine units that leads to the loss of charge carriers consequently decreasing the dielectric constant and electrical conductivity. Conclusion : PANI salt prepared in water shows the highest dielectric as well as conductivity due to the increased charge carriers provided both by long chain polymer as well as short chain oligomers.

Simulation of short-chain polymer collapse with an explicit solvent

2002 ◽  
Vol 116 (16) ◽  
pp. 7244-7254 ◽  
Author(s):  
James M. Polson ◽  
Martin J. Zuckermann
Keyword(s):  
Short Chain ◽  
Chain Polymer ◽  
Polymer Collapse ◽  
Explicit Solvent

Enzyme Kinetics of Short-Chain Polymer Cleavage

Biochemistry ◽  
1962 ◽  
Vol 1 (5) ◽  
pp. 723-734 ◽  
Author(s):  
Kenneth R. Hanson
Keyword(s):  
Enzyme Kinetics ◽  
Short Chain ◽  
Chain Polymer ◽  
Kinetics Of

Using Polymerised Nanocontacts to Improve the Electroluminescence of Porous Silicon

1999 ◽  
Vol 560 ◽  
Author(s):  
A.S.L. Chongt ◽  
L.M. Gan ◽  
D.J. Blackwood
Keyword(s):  
Porous Silicon ◽  
Contact Layer ◽  
Short Chain ◽  
Polymer Particles ◽  
Microemulsion Method ◽  
Chain Polymer ◽  
Conventional Methods

ABSTRACTA polyaniline contact layer was deposited via microemulsion polymerisation which resulted in nanosize short-chain polymer particles that penetrate deeper into the pores of porous silicon than polymers deposited by other more conventional methods. The microemulsion method gives a contact with higher chemical electroluminescence efficiency due to a larger area of actively emitting porous silicon.

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