The effect of the molecular weight of polyhydroxy ethers on their dielectric properties

Smekhov, F.M.; Nepomnyashchii, A. I.; Sanzharovskii, A. T.; Yakubovich, S.V.

doi:10.1016/0032-3950(71)90444-8

Cited by 4 publications

(2 citation statements)

References 11 publications

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“…of cross-linked epoxy resins to more than 2000 reduced the number of epoxy end-groups in the molecule, and suppressed the segmental motion and tan 8, but increased the dipole-group motion. Smekhov and Sanzbarovski [30] studied the effect of structure of the cross-linking agent and the molecular weight of the poly(hydroxy ether) on the dielectric properties of epoxy coatings. e ' and tan 5 were determined at 0.06-200 KHz at -70 to +250°C.…”

Section: B Solid State Studies Of Homopolymersmentioning

confidence: 99%

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Electrical Properties of Polymers

Klempner

Karasz

1972

Journal of Elastoplastics

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Downloaded from 140-170°C. Thermally stable polyesters useful in preparation of electrical insulators of high thermal stability were prepared by Behr [21] ] by condensation of (p-HOC6 H4 )2 CPh2 with C6 H4 (COCI)2 . Mognaschi et al [22] observed two distinct relaxation processes in poly(methyl sorbate) in the frequency range 33 Hz -100 KHz. The high-temperature process was ascribed to segmental motion of the

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Section: B Solid State Studies Of Homopolymersmentioning

confidence: 99%

“…Diel. Mater., Meas., and Appl., Lancaster, Eng.,[20][21][22][23][24]30 at University of Strathclyde on April 11, 2015 jep.sagepub.com Downloaded from…”

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confidence: 99%

Electrical Properties of Polymers

Klempner

Karasz

1972

Journal of Elastoplastics

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Glass Transition Temperatures of Polymers

Andrews

Grulke

1999

The Wiley Database of Polymer Properties

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VI-244 4.6. Poly(benzimidazoles) VI-245 4.7. Poly(benzothiazinophenothiazines) VI-245 4.8. Poly(benzothiazoles) VI-245 4.9. Poly(benzoxazlnes) VI-245 4.10. Poly(benzoxazoles) VI-245 4.11. Poly(carboranes) VI-245 4.12. Poly(dibenzofurans) VI-246 4.13. Poly(dioxoisoindolines) VI-246 4.14. Poly(fluoresceins) VI-247 4.15. Poly(furan tetracarboxylic acid diimides) VI-247 4.16. Poly(oxabicyclononanes) VI-247 4.17. Poly(oxadiazoles) VI-248 4.18. Poly(oxindoles) VI-248 4.19. Poly(oxoisoindolines) VI-248 4.20. Poly(phthalazines) VI-248 4.21. Poly(phthalides) VI-248 4.22. Poly(piperazines) VI-248 4.23. Poly(piperidines) VI-249 4.24. Poly(pyrazinoquinoxalines) VI-249 4.25. Poly(pyrazoles) VI-249 4.26. Poly(pyridazines) VI-249 4.27. Poly(pyridines) VI-249 4.28. Poly(pyromellitimides) VI-249 4.29. Poly(pyrrolidines) VI-250 4.30. Poly(quinones) VI-250 4.31. Poly(quinoxalines) VI-250 4.32. Poly(triazines) VI-252 4.33. Poly(triazoles) VI-252 Table 5. Copolymers VI-252 G. References VI-253 A. INTRODUCTIONAmorphous (noncrystalline) polymeric solids are either glasses or rubbers. A glassy polymer lacks long range order, and is below the temperature at which molecular motions take place on the time scale of the experiment. A rubbery polymer is above the temperature at which molecular motions take place on the time scale of the experiment. The glass transition temperature, T g , is the critical temperature that separates glassy behavior from rubbery behavior. Many amorphous solids, including polymers, organic liquids, biomaterials, some metals and alloys, and inorganic oxide glasses, exhibit glass transition temperatures. The dramatic change in the local movement of polymer chains at T g leads to large changes in a host of physical properties. These properties include density, specific heat, mechanical modulus, mechanical energy absorption, dielectric coefficients, acoustical properties, viscosity, and the rate of gas or liquid diffusion through the polymer, to name a few. Any of these properties can be used, at least in a crude manner, to determine T g . References page VI -253 Specific volume Gl assCrystal l i zati on vol ume change Li qui d

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