Volume Expansion of the Cured Bulk Adhesive

The thermal expansion ratio of the adhesive containing the thermally expansive microcapsules was measured with a thermodilatometer as shown in Fig. 34.4. The syringe was made of glass, so the specimen could be observed by eye. The bulk cylinders (diameter 7 mm, length 15 mm) of the cured adhesive were 

The volume change of the specimens containing different weight fractions of microcapsules up to 50% was measured isothermally at different temperatures. 

The same experiment was carried out using only silicone oil and its volume expansion was substracted from the experimental result The volume change of the specimens was calculated from the translation of the piston measured with a displacement pickup. 

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