Sequence-Controlled and Precision Oligomers for Photopolymer Networks: Synthesis Identity, Placement of Function and Property Attribution

Sequence-controlled and sequence-defined oligomers introduce a level of molecular specification that conventional photopolymer formulations rarely possess. Two materials can share the same overall composition and molar mass yet differ in the position of crosslinkable, polar, rigid or degradable units along the chain. That difference can change intramolecular folding, local reactivity, network connectivity and ultimately printability. Precision photochemistry has enabled sequence-defined macromolecules, and recent two-photon microprinting work directly demonstrates that the placement of crosslinkable units along short oligomers affects both printing behaviour and final properties. [1,2] This review defines the evidence required to attribute a printed-network property to sequence rather than to composition, dispersity, conversion or processing. It emphasises chain-identity analytics, matched-composition controls, reaction-site conversion and network-state characterisation, and it identifies where current evidence remains confined to small precision oligomers and microscale printing. ER-417.