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Shrinkage is due to double bond polymerization and maximum shrinkage can be readily
calculated from the densities of monomers and polymers (based on chemical composition).
Maximum shrinkage can be also estimated from functionality and molecular weight of
monomers. Differences observed between experimental shrinkage and calculated maximum
shrinkage for multifunctional acrylates are interpreted by limitation of double bond conversion
and network structure.
Glass transition of UV monomers has been investigated through viscoelastic measurements.
This technique appears to be more relevant than the classical Differential Scanning Calorimetry
(DSC) technique as it enables both the characterization of the glass transition temperature and
mechanical properties. Moreover, systems which can not be characterized by DSC have been
easily studied by viscoelastic measurements. All this information enables us to provide to our
customers a better understanding to the final mechanical properties of practically all the
fonnulations they can imagine.
