The interfacial conformation of polypropylene glycols and foam behaviour
Date
2004
Authors
Tan, S.N.
Fornasiero, D.
Sedev, R.V.
Ralston, J.
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Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2004; 250(1-3 SPEC. ISS.):307-315
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Abstract
The foam behaviour of low molecular weight polypropylene glycols (PPG) was investigated as a function of concentration and molecular weight (190-2000 g mol<sup>-1</sup>). For each polypropylene glycol, foam stability increases with concentration and passes through a maximum, beyond which foamability is suppressed as the solubility limit of the glycol is exceeded and droplets of glycol form. Light-scattering data as well as static and dynamic surface tension results provide the key information leading to these interpretations. A maximum in foamability was observed for the PPG molecules with increasing molecular weight (caused by a change in molecular conformation at the interface). This suppresses the Marangoni effect and leads to a decrease in foam stability. © 2004 Elsevier B.V. All rights reserved.
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