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Shrinkage Measurements of UV‐Curable Adhesives

An elegant method based on a laser distance sensor for in‐situ measurements of the polymerization shrinkage
: Lewoczko‐Adamczyk, W.; Marx, S.; Schröder, H.


Optik & Photonik 12 (2017), Nr.4, S.41-43
ISSN: 1863-1460
ISSN: 2191-1975
Fraunhofer IZM ()

Curing processes of any adhesive are always accompanied with its volumetric change, known as polymerization shrinkage. Although the relative volume change is usually less than a few percent, shrinkage is particularly problematic for applications where sub‐μm positioning is required, such as bonding of micro‐optics or optical fibers. We present a simple method to precisely measure the linear shrinkage of UV‐curable adhesives based on optical distance measurement. The method allows to observe in situ the dynamics of the shrinkage process.