Storage and loss moduli behavior of plasticized epoxy polymers over a frequency and temperature range, and damaging effects assessment by means of the NDT method of ultrasounds and moisture absorption

Sideridis, E; Prassianakis, IN; Kytopoulos, VN

dc.contributor.author	Sideridis, E	en
dc.contributor.author	Prassianakis, IN	en
dc.contributor.author	Kytopoulos, VN	en
dc.date.accessioned	2014-03-01T01:25:11Z
dc.date.available	2014-03-01T01:25:11Z
dc.date.issued	2006	en
dc.identifier.issn	0021-8995	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/17590
dc.subject	Damage	en
dc.subject	Diffusivity	en
dc.subject	Dynamic properties	en
dc.subject	Epoxy polymers	en
dc.subject	Loss modulus	en
dc.subject	Loss tangent	en
dc.subject	Moisture absorbtion	en
dc.subject	Nondestructive testing	en
dc.subject	Storage modulus	en
dc.subject	Ultrasounds	en
dc.subject.classification	Polymer Science	en
dc.subject.other	Absorption	en
dc.subject.other	Acoustic wave absorption	en
dc.subject.other	Diffusion	en
dc.subject.other	Elastic moduli	en
dc.subject.other	Epoxy resins	en
dc.subject.other	Nondestructive examination	en
dc.subject.other	Plasticizers	en
dc.subject.other	Ultrasonics	en
dc.subject.other	Damage	en
dc.subject.other	Diffusivity	en
dc.subject.other	Dynamic properties	en
dc.subject.other	Epoxy polymers	en
dc.subject.other	Loss modulus	en
dc.subject.other	Loss tangents	en
dc.subject.other	Moisture absorption	en
dc.subject.other	Storage modulus	en
dc.subject.other	Polymers	en
dc.subject.other	absorption	en
dc.subject.other	diffusion	en
dc.subject.other	mass transfer	en
dc.subject.other	microstructural analysis	en
dc.subject.other	moisture management	en
dc.subject.other	plasticizing agent	en
dc.subject.other	polymer	en
dc.subject.other	temperature effect	en
dc.subject.other	ultrasonics	en
dc.title	Storage and loss moduli behavior of plasticized epoxy polymers over a frequency and temperature range, and damaging effects assessment by means of the NDT method of ultrasounds and moisture absorption	en
heal.type	journalArticle	en
heal.identifier.primary	10.1002/app.24525	en
heal.identifier.secondary	http://dx.doi.org/10.1002/app.24525	en
heal.language	English	en
heal.publicationDate	2006	en
heal.abstract	The first objective of the present experimental work is to evaluate the storage and loss moduli of plasticized epoxy polymers over a temperature and frequency range, and to correlate with the ability of the ultrasounds for the characterization of such polymers. The materials used were a series of cold-setting epoxy polymers, plasticized with different amounts of plasticizer. After the investigation of dynamic properties through vibration tests, the velocities of longitudinal and transverse elastic waves, and the acoustic attenuation coefficient a were evaluated and, then, using these quantities, the ""dynamic"" moduli E', G', and v' were evaluated. Thereafter, it can be stated that the plasticizer content and measuring frequency range strongly influence the elastic moduli of the material in the sense that the plasticizer tends to reduce, whereas the measuring frequency to increase these. The second objective of this work is to asses and discuss the associated plasticizer-induced microstructural damaging effects by combined methods of ultrasounds, tensile modulus, as well as moisture absorption testing and then to correlate this assessment with the storage moduli behavior. It was shown that, despite the nonneglecting scatter in the experimental data, certain irresistible general trends might be assessed. In this context, it was found that the damage ""response"" is markedly sensitive to the respective applied ""detection"" technique and, therefore, the damage evolution data obtained by these different techniques are comparable only under certain circumstances. By comparison between the applied techniques, it seems reasonable to assume that the ""moisture"" technique due to its inherent microscopic mass transport processes, in the form of H2O molecules diffusion and therefore its ability to ""detect"" microstructural detects on a much lower scale, should give a better approach to the internal damage phenomena. © 2006 Wiley Periodicals, Inc.	en
heal.publisher	JOHN WILEY & SONS INC	en
heal.journalName	Journal of Applied Polymer Science	en
dc.identifier.doi	10.1002/app.24525	en
dc.identifier.isi	ISI:000239445500040	en
dc.identifier.volume	101	en
dc.identifier.issue	6	en
dc.identifier.spage	3869	en
dc.identifier.epage	3880	en