  Novel bifunctional cellulose diacetate derivatives were synthesized in order
to achieve bio-based photoresists, which can be structured by two-photon
absorption via direct laser writing (DLW) without the need to use a
photoinitiator. Therefore, cellulose diacetate is functionalized with thiol
moieties and olefinic or methacrylic side groups enabling thiol-conjugated
crosslinking. These cellulose derivatives are also photo-crosslinkable via UV
irradiation ($\lambda$ = 254 nm and 365 nm) without using an initiator.
