Realizing Vat‐Photocycloaddition 3D Printing with Recyclable Synthetic Photorheological Silicone Fluids
Realizing Vat‐Photocycloaddition 3D Printing with Recyclable Synthetic Photorheological Silicone Fluids
复制标题
利用可回收的合成光流变硅油实现还原光环加成 3D 打印
DOI：
10.1002/marc.202200407
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发表时间：
2022
影响因子：
4.6
通讯作者：
Honda Satoshi
中科院分区：
文献类型：
--
作者：
Oka Minami;Takagi Hideaki;Orie Akihiro;Honda Satoshi
合成硅橡胶有着广泛的应用，但仍需要开发具有可加工性、可回收性和机械性能可逆可调性的更环保的硅橡胶。在这里，开发了一种可回收的光流变硅油（RPSF），它依靠在波长 365（UV365）和 254 nm（UV254）的光交替照射下香豆素的可逆光环加成，实现了光照射时完全可逆的波长选择性液体-橡胶转换。流变学研究表明，所开发的 RPSF 的储能模量在 UV365 照射下增加了 100 000 倍以上，达到 20–50 kPa，而在 UV254 照射下则降低至约 0.01 kPa。香豆素光环加成的可逆性使得 RPSF 能够作为光解粘合剂应用。此外，利用硅橡胶优异的光固化性，即在UV365照射下粘弹性的急剧增加，实现了前所未有的硅橡胶的还原光环加成3D打印。
Synthetic silicone rubbers are finding a broad spectrum of applications, yet there is a demand for developing greener silicone rubbers with processability, recyclability, and reversible tunability in their mechanical properties. Here, a recyclable photorheological silicone fluid (RPSF) is developed, which realizes completely reversible wavelength‐selective liquid–rubber conversion upon photoirradiation, relying on the reversible photocycloaddition of coumarin upon alternating irradiation of light with wavelengths of 365 (UV365) and 254 nm (UV254). Rheological studies demonstrate that the storage modulus of the developed RPSF increases by a factor of more than 100 000 upon UV365irradiation to reach 20–50 kPa, while it decreases to ≈0.01 kPa upon UV254irradiation. The reversibility of the photocycloaddition of coumarin enables the application of RPSF as a photodismantlable adhesive. Furthermore, unprecedented vat‐photocycloaddition 3D printing of silicone rubber is realized by taking advantage of the excellent photocurability, that is, the dramatic increase in viscoelasticity upon UV365irradiation.