The use of mechanical and dielectric spectrometry for macrostructural studies (cure, ageing, moisture absorption, etc.) of polymers and composite materials is described. Dynamic relaxation parameters including the most probable relaxation time, and the width and symmetry of the spectrum are proposed for the quantitative evaluation of the structure. The analogy between mechanical and dielectric relaxation phenomena is discussed.
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References
1.
SummerscalesJ., Dielectrometry. In: Nondestructive Testing of Fibre-Reinforced Plastics Composites, ed. by SummerscalesJ., Elsevier Applied Science, London and New York, Vol. 2 (1987) 327.
2.
MatissI.G. and ShtraussV.D., Multi-parameter Dielectric Relaxation Spectrometry for Quality Control of Composites. NDT International, Vol. 21, No. 4, August (1988) 266.
3.
Solutions for Measuring Permittivity and Permeability. Hewlett Packard Application Notes 5952-7802 and 5952–1431 (1993).
4.
LangeYu.V. and UstinovE.G., The AD-60S Low Frequency Acoustic Flow Detector. Soviet Journal of Non-destructive Testing, January, 18(1) (1982) 11.
5.
CowleyP. and AdamsR.D., Vibration Techniques. In: Non-Destructive Testing of Fibre-Reinforced Plastics Composites, ed. by SummerscalesJ., Elsevier Applied Science, London and New York, Vol. 1 (1987) 151.
6.
ArlingtonM., Acoustic Emission. In: Non-Destructive Testing of Fibre-Reinforced Plastics Composites, ed. by SummerscalesJ., Elsevier Applied Science, London and New York, Vol. 1 (1987) 25.
7.
MatissI.G., Spectrometric Technique for Investigation of Composite Materials Structure. Review. Mechanics of Composite Materials, No. 2 (1991) 320.
8.
SichinaW.J., Characterisation of Thermosetting Systems by DEA. Techn. Rev., Du Pont Comp. Instr. Systems, Wilmington, April 12 (1989) 23.
StanY., ETMA and UNIRELAX: new directions for the Testing, Controlling and Analysis of Non-Metallics. Bicentennial of Materials Progress. 21st National SAMPE Symp. Exhibition, Huatt House at Los Angeles Airport, April 6–8, Los Angeles, Vol. 21 (1976) 994.
11.
DayD.R., Thermostat Cure Process Control Utilising Microdielectric Feedback. In: Advancing with Composites. Proceedings of the International Conference on Composite Materials, Milan, May 10–12 (1988) Vol. II, 535.
12.
HavriliakS and NegamiS., A Complex Plane Representation of Dielectric and Mechanical Relaxation Process in Some Polymers, Polymer, Vol. 8, No. 4 (1967) 161.
