Interfacial Photopolymerization: A Method for Light-Based Printing of Thermoplastics
Interfacial Photopolymerization: A Method for Light-Based Printing of Thermoplastics
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DOI：
10.1021/acsami.3c04803
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发表时间：
2023-06-13
影响因子：
9.5
通讯作者：
Hart，A. John
中科院分区：
文献类型：
--
作者：
Chazot，Cecile A. C.;Creighton，Megan A.;Hart，A. John
光聚合物的紫外印刷因其高分辨率和高通量而成为一种广泛采用的制造方法。然而，可用的可打印光聚合物通常是热固性的，这导致了打印结构后处理和回收的挑战。在这里，我们提出了一种称为界面光聚合（IPP）的新工艺，可以实现线性链聚合物的光聚合印刷。在IPP中，在两种不相混的液体之间的界面上形成聚合物膜，其中一种含有链生长单体，另一种含有光引发剂。我们展示了IPP在一个概念验证投影系统中的集成，用于印刷聚丙烯腈（PAN）薄膜和基本的多层形状。IPP的面内和面外分辨率与传统的光打印方法相当。获得了数均分子量大于15 kg mol - 1的聚丙烯腈薄膜，据我们所知，这是首次报道聚丙烯腈的光聚合印刷。建立了IPP的宏观动力学模型，以阐明所涉及的传输和反应速率，并评估反应参数如何影响薄膜厚度和打印速度。最后，在多层结构中对IPP进行了演示，表明其适用于线性链聚合物的三维打印。
Ultraviolet (UV) printing of photopolymers is a widely adopted manufacturing method because of its high resolution and throughput. However, available printable photopolymers are typically thermosets, resulting in challenges in postprocessing and recycling of printed structures. Here, we present a new process called interfacial photopolymerization (IPP) which enables photopolymerization printing of linear chain polymers. In IPP, a polymer film is formed at the interface between two immiscible liquids, one containing a chain-growth monomer and the other containing a photoinitiator. We demonstrate the integration of IPP in a proof-of-concept projection system for printing of polyacrylonitrile (PAN) films and rudimentary multi-layer shapes . IPP shows in-plane and out-of-plane resolutions comparable to conventional photoprinting methods. Cohesive PAN films with number-average molecular weights greater than 15 kg mol–1are obtained, and to our knowledge this is the first report of photopolymerization printing of PAN. A macrokinetics model of IPP is developed to elucidate the transport and reaction rates involved and evaluate how reaction parameters affect film thickness and print speed. Last, demonstration of IPP in a multilayer scheme suggests its suitabiliy for three-dimensional printing of linear-chain polymers.