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The diffusion of plasticisers from polyvinyl chloride

Small, P. A.

Journal of the Society of Chemical Industry (Online), 1947-01, Vol.66 (1), p.17-19

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Título:
The diffusion of plasticisers from polyvinyl chloride
Autor: Small, P. A.
É parte de: Journal of the Society of Chemical Industry (Online), 1947-01, Vol.66 (1), p.17-19
Notas: istex:9C8B8429586284F41901969DBAA7CC6E54502F7B
ark:/67375/WNG-91BBG93S-S
Read before the Plastics Group on February 20, 1946.
ArticleID:JCTB5000660107
Descrição: This paper discusses the factors controlling the rate of loss of plasticiser from polyvinyl chloride compositions to a surrounding gas phase. These are (a) the rate of diffusion in the solid phase or (b) that in the gas phase; for any set of conditions one or other of these will usually be predominant. The rate of desorption from the solid to the gas phase is not considered likely to be a controlling factor in practical circumstances. When gas phase diffusion is rate‐controlling, the loss rate will depend greatly on the degree of turbulence in the gas phase. Since the diffusion contents of ordinary plasticisers calculated from Gilliland's equation1 do not differ as much as the vapour pressures of the plasticisers, the rate of loss will be roughly proportional to the vapour pressure, at different temperatures or for different plasticisers. When solid phase diffusion is rate‐controlling the loss rate, independent of air velocity, will depend on the dimensions of the sample, particularly on its thickness.
Editor: New York: John Wiley & Sons, Ltd
Idioma: Inglês

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