UV-Induced Cationic Ring-Opening Polymerization of 2-Oxazolines for Hot Lithography,ACS Macro Letters

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UV-Induced Cationic Ring-Opening Polymerization of 2-Oxazolines for Hot Lithography
ACS Macro Letters ( IF 5.1 ) Pub Date : 2020-03-25 , DOI: 10.1021/acsmacrolett.0c00055
Nicolas Klikovits , Lisa Sinawehl ₁ , Patrick Knaack , Thomas Koch , Jürgen Stampfl , Christian Gorsche ₁ , Robert Liska

Affiliation

The cationic ring-opening polymerization (CROP) of 2-oxazolines gives polymers with unique characteristics arising from its polyamide backbones and structural versatility. Up to now, poly(2-oxazoline)s were obtained by classical thermal polymerization methods not aiming for application in bulk curing of structural polymers. We introduce the cationic photopolymerization of 2-oxazolines at elevated temperatures for the direct UV-induced curing of materials with exclusive chemical and structural particularities. After efficient photoinitiation via onium salt photoacid generators (PAGs), the immanent low-rate propagation is crucially promoted by thermal energy input to the ring-opening reaction. In simultaneous thermal analysis (STA), photo-DSC, and (thermo)mechanical analyses we investigated the UV-induced CROP of 2-oxazolines in a temperature range of 100–140 °C and show the exceptional potential of the introduced photopolymers. Furthermore, we applied the photopolymerizable system in Hot Lithography, a stereolithography-based 3D printing technology at elevated temperatures.

中文翻译：

用于热光刻的 2-恶唑啉的紫外诱导阳离子开环聚合

2-恶唑啉的阳离子开环聚合 (CROP) 使聚合物具有源自其聚酰胺骨架和结构多功能性的独特特性。到目前为止，聚（2-恶唑啉）是通过经典的热聚合方法获得的，并非旨在应用于结构聚合物的本体固化。我们介绍了 2-恶唑啉在高温下的阳离子光聚合，用于直接紫外诱导固化具有独特化学和结构特性的材料。在通过鎓盐光产酸剂 (PAG) 进行有效光引发后，向开环反应输入的热能极大地促进了固有的低速率传播。在同时热分析 (STA)、光 DSC、和（热）机械分析我们研究了 2-恶唑啉在 100-140°C 的温度范围内的紫外线诱导 CROP，并显示了引入的光聚合物的特殊潜力。此外，我们将光聚合系统应用于热光刻，这是一种在高温下基于立体光刻的 3D 打印技术。

更新日期：2020-04-23

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