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Near infrared (NIR) spectroscopy compared with thermogravimetric analysis as a tool for on-line prediction of water diffusion in polyamide 6,6
KTH, Tidigare Institutioner                               , Polymerteknologi.
KTH, Tidigare Institutioner                               , Polymerteknologi.ORCID-id: 0000-0002-5394-7850
2002 (engelsk)Inngår i: Polymer international, ISSN 0959-8103, E-ISSN 1097-0126, Vol. 51, nr 12, s. 1366-1370Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

NIR spectroscopy in the transmission mode and thermogravimetric analysis were used to predict diffusion of water into polyamide 6,6 samples immersed in water at 40, 60, 75 and 90degreesC for different periods of time. The sorption curves between 40 and 75 were sigmoidal indicating that the surface concentration was time dependent. The sorption curves were readily fitted by the use of a time-dependent surface concentration and a water-concentration-dependent diffusivity. The zero-concentration water diffusivity decreased non-linearly and the activation energy of diffusion increased from 24 to 58 kJ mol(-1), with decreasing temperature. The surface concentration relaxation time decreased rapidly. The sorption of water in thick polyamide samples was readily characterized by FT-NIR spectroscopy. The accuracy and feasibility of this method was similar to conventional thermogravimetric methods. The greatest advantage of FT-NIR, however, is the possibility of detecting and monitoring the moisture concentration on-line and in a non-destructive way.

sted, utgiver, år, opplag, sider
2002. Vol. 51, nr 12, s. 1366-1370
Emneord [en]
polyamide 6,6, water absorption, thermogravimetric analysis, NIR, small-molecule penetrants, polymeric materials, nylon 6,6, transport, sorption, coefficients, composites, vapor, films, atr
Identifikatorer
URN: urn:nbn:se:kth:diva-22177DOI: 10.1002/pi.1042ISI: 000180406100011OAI: oai:DiVA.org:kth-22177DiVA, id: diva2:340875
Merknad
QC 20100525Tilgjengelig fra: 2010-08-10 Laget: 2010-08-10 Sist oppdatert: 2017-12-12bibliografisk kontrollert

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