High-temperature shape memory photopolymer with intrinsic flame retardancy and record-high recovery stress

• A mechanically robust high-temperature shape memory photopolymer is reported. The glass transition temperature can reach 280 °C after thermally post-curing. HTSMP possesses record-high recovery stress and energy output. Synergy between isocyanurate phosphine oxide contributes to high flame-retardancy. available for high-resolution digital light printing. Here we report an intrinsically flame-retardant (HTSMP) with ultrahigh ( T g ) of 280°C record-breaking 35.3 MPa. Photopolymers have been widely used in 3D printing structures resolution by technologies such as processing (DLP). However, a bottleneck persists the lack inks integrated , flame-retardancy, stress, which are highly desired several sectors aerospace, automotive, construction, oil&gas, electronic industries. In addition, photopolymers usually low mechanical strength toughness, limiting their use critical load-bearing structures. this study, photopolymerizable triacrylate photo-initiator were firstly formulated prepare through facile two-step ultraviolet (UV) curing thermal process. UV makes printable. After unusual (280 3 h) post-curing, network was crosslinked uniform, enhanced toughness. Additionally, synergy contributed excellent stability flame-retardancy HTSPM, cannot be ignited upon ten-second ignition two times. condensed-phase mechanism also identified. With output, stability, intrinsic flame retardancy, printability, new multifunctional has great potential various applications, deployable structures, damage self-healing, actuators, proppants, 4D printing, robotics.