The use of green alternatives to petrochemicals from renewable feedstocks is of great interest globally, especially within additive manufacturing efforts. To this end, the utilization of the terpenoid linalool is presented for photopolymer resins 3D printed using digital light processing (DLP) with thiol-ene click chemistry. Linalool derivatives are made from single-step modifications, providing multiple greener alternatives to current acrylate photopolymers, and are characterized based upon rheology, thermomechanical, and shape memory properties. The use of aliphatic and aromatic diisocyanates to produce tetra-functional monomers is demonstrated to provide tunability to the photoreactivity/gelation time as well as significantly enhancing the tensile properties (2–3 orders of magnitude increase in elastic modulus) and thermal properties (glass transition temperature increase from ∼12 °C for linalool to 75 °C for the isophorone diisocyanate-containing linalool urethane derivative) and 4D behavior, in this case shape memory response. Ultimately, the derivatives are shown to be better candidates for DLP-type 4D printing of complex prototypes, using a porous cubic structure to demonstrate the additive manufacturing potential of this simple material platform.

中文翻译：

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用于天然产物 4D 打印树脂的芳樟醇衍生物

使用可再生原料中的石化产品的绿色替代品在全球范围内引起了极大的兴趣，尤其是在增材制造方面。为此，介绍了萜类芳樟醇在使用数字光处理 (DLP) 和硫醇-烯点击化学 3D 打印的光聚合物树脂中的应用。芳樟醇衍生物由单步改性制成，为当前的丙烯酸酯光聚合物提供多种更环保的替代品，并基于流变学、热机械和形状记忆特性进行表征。证明使用脂肪族和芳香族二异氰酸酯生产四官能单体可以调节光反应性/凝胶时间，并显着提高拉伸性能（弹性模量增加 2-3 个数量级）和热性能（玻璃化转变温度从约 12°C（芳樟醇）增加到 75°C（含异佛尔酮二异氰酸酯的芳樟醇氨基甲酸酯衍生物）和 4D 行为，在这种情况下是形状记忆响应。最终，这些衍生物被证明是复杂原型的 DLP 型 4D 打印的更好候选者，使用多孔立方结构来证明这种简单材料平台的增材制造潜力。