Epoxy Doped, Nano‐scale Phase‐separated Poly‐Acrylates with Potential in 3D Printing,Macromolecular Materials and Engineering

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Epoxy Doped, Nano‐scale Phase‐separated Poly‐Acrylates with Potential in 3D Printing
Macromolecular Materials and Engineering ( IF 4.2 ) Pub Date : 2021-01-15 , DOI: 10.1002/mame.202000558
Osman Konuray ₁ , Arnau Altet ₁ , Jordi Bonada ₂ , Agnieszka Tercjak ₃ , Xavier Fernández‐Francos ₁ , Xavier Ramis ₁

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An efficient method to improve the mechanical performance of a commercially available photocure resin is described wherein the resin is modified with a mixture of a cycloaliphatic epoxy and an anhydride curing agent. Photocured samples are thermally treated in a subsequent step to cure the epoxy to obtain an interpenetrated polymer network (IPN) and also complete reaction of the acrylate monomers remaining from the photocure. The latter is accomplished by a thermal radical initiator added earlier into the formulation together with the epoxy‐anhydride. The thermal properties and microstructure of the resulting IPN are analyzed. Uniform and quantitative conversions are obtained, with glass transition temperatures comparable to conventional epoxies. The liquid, uncured samples containing different amounts of epoxy are stable at 30 °C for several weeks. In the fully cured epoxy‐rich materials, nano‐scale phase separation is observed by atomic force microscopy. This is corroborated by the existence of multiple relaxations determined by dynamic mechanical analysis analysis. Specimens from a formulation containing 50% by weight of epoxy‐anhydride are 3D printed in a customized masked image processing stereolithography, thermally treated, and are subjected to compression tests. Results show that Young's modulus increases by 900% over the neat resin.

中文翻译：

环氧掺杂的纳米级相分离聚丙烯酸酯，在3D打印中具有潜力

描述了一种改善可商购的光固化树脂的机械性能的有效方法，其中用脂环族环氧树脂和酸酐固化剂的混合物对该树脂进行改性。在后续步骤中对光固化的样品进行热处理，以固化环氧树脂，从而获得互穿的聚合物网络（IPN），并使光固化后残留的丙烯酸酯单体完全反应。后者是通过将热自由基引发剂与环氧酸酐一起添加到配方中来实现的。分析所得IPN的热性能和微观结构。在玻璃化转变温度可与传统环氧树脂相比的情况下，获得了均匀和定量的转化率。液体包含不同量环氧树脂的未固化样品在30°C的温度下可稳定数周。在完全固化的富含环氧的材料中，通过原子力显微镜观察到了纳米级相分离。通过动态力学分析分析确定的多重弛豫的存在证实了这一点。在定制的蒙版图像处理立体平版印刷中，对包含50％重量比例的环氧酸酐的配方样品进行3D打印，进行热处理，然后进行压缩测试。结果表明，与纯树脂相比，杨氏模量增加了900％。在定制的蒙版图像处理立体平版印刷中，对包含50％重量比例的环氧酸酐的配方样品进行3D打印，进行热处理，然后进行压缩测试。结果表明，与纯树脂相比，杨氏模量增加了900％。在定制的蒙版图像处理立体平版印刷中，对包含50％重量比例的环氧酸酐的配方样品进行3D打印，进行热处理，然后进行压缩测试。结果表明，与纯树脂相比，杨氏模量增加了900％。

更新日期：2021-03-18

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