Cryogenic Service of Printed Photopolymers: Glass Transition, Thermal Shock, Permeation, Fracture and Repeated Cycling

Cryogenic use of printed photopolymers cannot be inferred from room-temperature strength or a low glass-transition temperature alone. Cooling changes modulus, yield behaviour, fracture processes, thermal contraction and interface stresses; rapid temperature change can generate gradients and microcracking; and seals or thin walls may lose function before bulk coupons fail. Direct testing of DLP photopolymer resin at 77 K has reported embrittlement and contraction-related failure for the tested material, while other research shows that tailored photopolymer chemistry can improve sub-zero toughness. This review develops a qualification architecture from temperature-dependent material screening to component-level thermal cycling. It requires strain/contraction measurement, strength and fracture evidence at the service temperature, inspection for cracking, and functional checks such as leak or dielectric performance after repeated cycles. The central conclusion is that cryogenic suitability is a bounded state of a specific network, geometry and cooling history. A successful single cold exposure does not establish repeated-cycle reliability.

ER-287 · Version 0.3.