There is a lack of a comprehensive understanding of the size reduction in femtosecond two-photon polymerization (TPP) fabricated structures. In this work, we aim to evaluate the volumetric strain distribution induced by covalent bond formation during TPP. We present a transient computational model which simulates the photochemical processes during TPP and calculates the functional group conversion at each time step. The nonuniform strain development is obtained by incorporating the shrinkage – double bond conversion correlation of bulk materials. The shrinkage induced by chemical bond formation is found to reduce the size of the final structure on the order of a few percent.
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