Acrysol WS-24

In reply to Claire Peachey's query about Acrysol WS24; this product
featured in a project by Pia Gottschaller at the Courtauld Institute
of Art, University of London last year. Some of the project material
has since been published in the preprints to the IIC Nordic Group
(NKF) conference in Oslo in March 1997, and I can arrange for a copy
to be sent. The project looked at the properties of WS24 together
with a range of other polymer dispersion consolidants under
accelerated ageing (light, light+heat, heat).  Properties of the
dried polymer films that were tested included colour stability, pH
of water extracts, solubility, tensile mechanical properties and
formation of corrosive volatile matter (by the Oddy Test). Monomer
compositions were also studied by Pyrolysis GC-MS.

The thing that one might watch out for with Acrysol WS24 are its
mechanical properties: it has a high glass transition temperature
(above 40C), and is brittle and glassy at ambient conditions.  It
may, therefore, not be suitable for use on or for flexible
substrates. It also shows really quite strong thermoplastic
properties with considerable flow at temperatures above its Tg.
Colour stability was not bad. Hope this helps.

Alan Phenix
FOM Institute for Atomic and Molecular Physics
Kruislaan 407
Amsterdam
Netherlands

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                  Conservation DistList Instance 10:96
                    Distributed: Monday, May 5, 1997
                       Message Id: cdl-10-96-002
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