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The future ATLAS ITk strip tracker will consist of 17,000 silicon stripdetector modules mounted on support structures called cores. Cores areassembled from a number of components, among others carbon fibre facings,honeycomb structure and carbon foam surrounding titanium tubes used forcooling, using a two-component epoxy (Hysol 9396) loaded with boron nitride forgood thermal conductivity. The adhesive constitutes about 20 % of a core'sweight. During operation, the detector is cooled down to -40 $^\circ$C usingbi-phase carbon dioxide and flushed with dry gas to prevent condensation. Theeffect of this temperature change has been simulated to study the impact ofCoefficient of Thermal Expansion (CTE) mismatches between different materialsand investigate resulting deformations and misalignment. In addition to theshrinking of an adhesive during cooling, which can be estimated well using itsknown CTE, flushing the detector volume with dry gas removes the moisturecontained in the adhesive, leading to an additional shrinking. In order toestimate the impact of shrinking during drying, the Coefficient of MoistureExpansion (CME) of Hysol samples with different contents of boron nitride aswell as their overall moisture absorption were measured and their extentcompared to the contraction associated with cooling.

Measuring the coefficient of moisture expansion of Hysol 9396 loaded with boron nitride powder