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Dielectric and mechanical properties of poly(vinyl chloride)–dioctylphthalate systems
Author(s) -
Bishai A. M.,
Gamil F. A.,
Awni F. A.,
AlKhayat B. H. F.
Publication year - 1985
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1985.070300518
Subject(s) - ultimate tensile strength , plasticizer , materials science , dielectric , vinyl chloride , elongation , glass transition , composite material , dielectric loss , conductivity , electrical resistivity and conductivity , loss factor , absorption (acoustics) , permittivity , degree (music) , analytical chemistry (journal) , polymer chemistry , polymer , chemistry , chromatography , optoelectronics , copolymer , engineering , physics , acoustics , electrical engineering
Abstract The mechanical properties, tensile strength, and elongation were investigated for poly(vinyl chloride) (PVC) samples mixed with dioctylphthalate (DOP) at concentrations from 0 to 100 parts per hundred parts PVC at 23°C. It was found that the tensile strength decreased with the increase of concentration, and the elongation was increased until a concentration of 30 DOP content, and then decreased. This leads to the suggestion that intermolecular plasticization is dominant until 30 DOP content, while interstructural plasticization is prevailing for higher concentrations. The permittivity ε′ and the dielectric loss factor ε″ of the same samples have been measured in the frequency range 10 2 –10 5 Hz at temperatures from 3 to 96°C. Results show that as the DOP content increases in PVC, the dielectric absorption becomes broader, and the glass transition temperature T g is lowered. The magnitude of the loss peak decreases with an increase of DOP content to a minimum at concentrations from 40 to 60 DOP content. At higher concentrations the loss peak is increased and T g is unaltered. Another absorption was observed at 100 Hz and at high temperatures, which was attributed to Maxwell–Wagner effect or direct current conductivity or both of them. It was found that the sample containing 40 parts DOP in 100 parts PVC possesses the best mechanical and electrical properties.