Electrical Resistivity and Crosslinking in Thermosetting Resins

Learmonth, G. S.; Pritchard, Geoffrey

doi:10.1021/i360030a005

Cited by 8 publications

(1 citation statement)

References 12 publications

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“…The same catalyst system (1% by weight of benzoyl peroxide and o.00770 N,N' p-dimethyl toluidine) was used as in previous studies. [8][9][10][11] Experimental A polymerization cell was made from two parallel glass plates, 5 in. square and 3//16 in.…”

Section: Dielectric Constant and Loss As Cure Parametersmentioning

confidence: 99%

Dielectric relaxation and crosslinking in unsaturated polyester resins

Learmonth

Pritchard

1969

J of Applied Polymer Sci

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The properties of crosslinked thermosetting resins depend markedly on the completeness of the crosslinking process. Determination of the degree of cure of an unsaturated polyester resin has been studied previously by mechanical, spectroscopic and volume resistivity methods. I n this respect the effect of cure time and temperature on the ac dielectric constant and dissipation factor a t 1 kc/s and 10 kc/s is considered. The dissipation factor appears to be a most useful parameter for detecting changes in the degree of cure in the later stages of reaction.The electrical properties of the cured resin are discussed, and values for the energy of activation for electrical conduction are compared with literature reports on similar materials.

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Section: Dielectric Constant and Loss As Cure Parametersmentioning

confidence: 99%

Dielectric relaxation and crosslinking in unsaturated polyester resins

Learmonth

Pritchard

1969

J of Applied Polymer Sci

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Bromostyrene‐crosslinked polyesters. III. Electrical properties

Konieczny¹,

Marom²,

Weinberg

1977

J of Applied Polymer Sci

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SynopsisVolume resistivity, dielectric strength, dielectric constant, and loss tangent of unsaturated polyester resins and their GRP were studied as a function of the bromine content of the resin. The bromine was introduced by using bromostyrene as the crosslinking monomer. Bromine content was established by partial or total replacement of the styrene. Also, the effects of short and long water-boil treatments on these properties were investigated. The electrical and dielectrical properties were shown to be independent of the bromine content of the resin.

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Kinetics and thermal characterization of thermoset cure

Kamal

Sourour

1973

Polymer Engineering & Sci

963

516

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The differential scanning calorimeter (Perkin‐Elmer DSC‐1) is used to characterize the cure of a general‐purpose polyester during isothermal and scanning experiments. The technique is based on a new proposed model for the kinetics of isothermal cure. The model yields results which are in good agreement with experimental isothermal rate of reaction and integral heat of reaction data. It also gives some information about the residual reactivity of the sample after an isothermal cure experiment. With the aid of the proposed kinetic model, it is possible to obtain integral heats of reaction and rates of heat generation at different temperatures during a scanning experiment. The difference between the rate of heat input to the sample and the heat of reaction at any instant during scanning may be used to calculate the specific heat of the sample at the same instant. Specific heat data show two maxima during each scanning experiment. These maxima may be associated with transitions occurring during cure in the melt and rubbery states.

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Electrical Resistivity and Crosslinking in Thermosetting Resins

Cited by 8 publications

References 12 publications

Dielectric relaxation and crosslinking in unsaturated polyester resins

Dielectric relaxation and crosslinking in unsaturated polyester resins

Bromostyrene‐crosslinked polyesters. III. Electrical properties

Kinetics and thermal characterization of thermoset cure

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