Use of infrared thermography for temperature measurement during evaporative casting of thin polymeric films

A. R. Greenberg, S. S. Shojaie, W. B. Krantz*, S. B. Tantekin-Ersolmaz

*Bu çalışma için yazışmadan sorumlu yazar

Araştırma sonucu: Dergiye katkıMakalebilirkişi

14 Atıf (Scopus)

Özet

In this paper we describe the development of a real-time, noninvasive technique using infrared (IR) thermography for measurement of the temperature of polymer solutions cast as thin films in which evaporation of a volatile solvent occurs. The technique requires the accurate determination of a single surface radiation property, the emittance, and its dependence on the casting solution composition. We report results obtained for the cellulose acetate (CA)-acetone system for which IR measurements indicate a relatively rapid and significant temperature decrease followed by a gradual temperature recovery toward the initial temperature. In general the thin film temperature response can be described by the parameters ΔTmax, the maximum degree of cooling; tmin, the time at which Tmin is reached; and the recovery temperature, Trec, at a time equal to 2 × tmin. For 155 and 258 μm thick films evaporatively cast from a 15 wt% CA solution, IR thermography indicated maximum temperature decreases of 18 and 26°C, respectively. The characteristics of the thin film temperature curves for these two cases compare favorably with those predicted by a first-principles model recently developed by the authors. Based upon these results, the general applicability of the infrared technique for the study of dense film- and membrane-formation processes is described, and the significance of thin film temperature measurements with respect to membrane morphology is discussed.

Orijinal dilİngilizce
Sayfa (başlangıç-bitiş)249-261
Sayfa sayısı13
DergiJournal of Membrane Science
Hacim107
Basın numarası3
DOI'lar
Yayın durumuYayınlandı - 30 Kas 1995

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