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Oxygen Tolerant PET-RAFT Facilitated 3D Printing of Polymeric Materials under Visible LEDs
ACS Applied Polymer Materials ( IF 5 ) Pub Date : 2020-02-04 , DOI: 10.1021/acsapm.9b01076 Ali Bagheri 1, 2 , Chris William Anderson Bainbridge 1 , Kyle Edward Engel 1 , Greg G. Qiao 3 , Jiangtao Xu 4 , Cyrille Boyer 4 , Jianyong Jin 1, 2
ACS Applied Polymer Materials ( IF 5 ) Pub Date : 2020-02-04 , DOI: 10.1021/acsapm.9b01076 Ali Bagheri 1, 2 , Chris William Anderson Bainbridge 1 , Kyle Edward Engel 1 , Greg G. Qiao 3 , Jiangtao Xu 4 , Cyrille Boyer 4 , Jianyong Jin 1, 2
Affiliation
The photopolymerization-based 3D printing process is typically conducted by using free radical polymerization, which leads to fabrication of immutable materials. An alternative 3D printing of polymeric materials by using trithiocarbonate (TTC) reversible addition–fragmentation chain transfer (RAFT) agents has always been a challenge for material and polymer scientists. Herein we report 3D printing of RAFT-based formulations that can be conducted fully open to air using a standard digital light processing (DLP) 3D printer and under mild conditions of visible light at blue (λmax = 483 nm, 4.16 mW/cm2) or green (λmax = 532 nm, 0.48 mW/cm2) wavelength. Our approach is based on activation of TTC RAFT agents using eosin Y (EY) as a photoinduced electron-transfer (PET) catalyst in the presence of a reducing agent (triethylamine (TEA)), which facilitated the oxygen tolerant 3D printing process via a reductive PET initiation mechanism. Reactivation of the TTCs present within the polymer networks enables postprinting monomer insertion into the outer layers of an already printed dormant object under a second RAFT process, which provides a pathway to design a more complex 3D printing. To our best knowledge, this is the first example of oxygen tolerant EY/TEA catalyzed PET-RAFT facilitated 3D printing of polymeric materials. We believe that our strategy is a significant step forward in the field of 3D printing.
中文翻译:
耐氧PET-RAFT促进了可见LED下聚合物材料的3D打印
基于光聚合的3D打印过程通常是通过使用自由基聚合进行的,这导致了不可变材料的制造。使用三硫代碳酸酯(TTC)可逆加成-断裂链转移(RAFT)剂进行聚合物材料的替代3D打印一直是材料和聚合物科学家面临的挑战。本文中,我们报告了基于RAFT的配方的3D打印,可以使用标准数字光处理(DLP)3D打印机在蓝色(λmax = 483 nm,4.16 mW / cm 2)或绿色(λmax = 532 nm,0.48 mW / cm 2)波长。我们的方法是基于在还原剂(三乙胺(TEA))存在下使用曙红Y(EY)作为光诱导电子转移(PET)催化剂活化TTC RAFT试剂的过程,该过程促进了3D打印的耐氧性还原性PET引发机理。聚合物网络中存在的TTC的重新激活,可以在第二次RAFT过程中将后印单体插入到已印刷的休眠对象的外层中,这为设计更复杂的3D打印提供了途径。据我们所知,这是耐氧的EY / TEA催化PET-RAFT促进聚合物材料3D打印的第一个例子。我们认为,我们的策略是3D打印领域迈出的重要一步。
更新日期:2020-02-04
中文翻译:
耐氧PET-RAFT促进了可见LED下聚合物材料的3D打印
基于光聚合的3D打印过程通常是通过使用自由基聚合进行的,这导致了不可变材料的制造。使用三硫代碳酸酯(TTC)可逆加成-断裂链转移(RAFT)剂进行聚合物材料的替代3D打印一直是材料和聚合物科学家面临的挑战。本文中,我们报告了基于RAFT的配方的3D打印,可以使用标准数字光处理(DLP)3D打印机在蓝色(λmax = 483 nm,4.16 mW / cm 2)或绿色(λmax = 532 nm,0.48 mW / cm 2)波长。我们的方法是基于在还原剂(三乙胺(TEA))存在下使用曙红Y(EY)作为光诱导电子转移(PET)催化剂活化TTC RAFT试剂的过程,该过程促进了3D打印的耐氧性还原性PET引发机理。聚合物网络中存在的TTC的重新激活,可以在第二次RAFT过程中将后印单体插入到已印刷的休眠对象的外层中,这为设计更复杂的3D打印提供了途径。据我们所知,这是耐氧的EY / TEA催化PET-RAFT促进聚合物材料3D打印的第一个例子。我们认为,我们的策略是3D打印领域迈出的重要一步。