Vinyl Sulfonate Esters: Efficient Chain Transfer Agents for the 3D Printing of Tough Photopolymers without Retardation,Angewandte Chemie International Edition

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Vinyl Sulfonate Esters: Efficient Chain Transfer Agents for the 3D Printing of Tough Photopolymers without Retardation
Angewandte Chemie International Edition ( IF 16.1 ) Pub Date : 2018-06-20 , DOI: 10.1002/anie.201803747
Konstanze Seidler _{1,

2} , Markus Griesser ₃ , Markus Kury ₁ , Reghunathan Harikrishna _{1,

2} , Peter Dorfinger ₄ , Thomas Koch ₄ , Anastasiya Svirkova ₅ , Martina Marchetti-Deschmann ₅ , Juergen Stampfl _{2,

4} , Norbert Moszner ₆ , Christian Gorsche _{1,

2} , Robert Liska _{1,

2}

Affiliation

The formation of networks through light‐initiated radical polymerization allows little freedom for tailored network design. The resulting inhomogeneous network architectures and brittle material behavior of such glassy‐type networks limit the commercial application of photopolymers in 3D printing, biomedicine, and microelectronics. An ester‐activated vinyl sulfonate ester (EVS) is presented for the rapid formation of tailored methacrylate‐based networks. The chain transfer step induced by EVS reduces the kinetic chain length of the photopolymer, thus shifting the gel point to higher conversion, which results in reduced shrinkage stress and higher overall conversion. The resulting, more homogeneous network is responsible for the high toughness of the material. The unique property of EVS to promote nearly retardation‐free polymerization can be attributed to the fact that after the transfer step no polymerizable double bond is formed, as is usually seen in classical chain transfer agents. Laser flash photolysis, theoretical calculations, and photoreactor studies were used to elucidate the fast chain transfer reaction and exceptional regulating ability of EVS. Final photopolymer networks exhibit improved mechanical performance making EVS an outstanding candidate for the 3D printing of tough photopolymers.

中文翻译：

乙烯基磺酸酯：有效的链转移剂，用于不延迟的3D打印坚韧的光敏聚合物

通过光引发的自由基聚合形成网络，为定制网络设计提供了很少的自由。这样的玻璃状网络导致的不均匀网络架构和脆性材料行为限制了光聚合物在3D打印，生物医学和微电子领域的商业应用。提出了一种酯活化的乙烯基磺酸酯（EVS），用于快速形成定制的基于甲基丙烯酸酯的网络。由EVS引发的链转移步骤减少了光敏聚合物的动力学链长，从而将胶凝点转移至更高的转化率，这导致收缩应力降低和总转化率更高。产生的更均匀的网络是材料的高韧性的原因。EVS促进几乎无阻滞聚合的独特性质可以归因于这样的事实，即在转移步骤后没有形成可聚合的双键，这在传统的链转移剂中通常会看到。激光闪光光解，理论计算和光反应器研究被用来阐明EVS的快速链转移反应和出色的调节能力。最终的光敏聚合物网络显示出改进的机械性能，从而使EVS成为3D打印坚韧光敏聚合物的出色候选者。和光反应器研究用于阐明EVS的快速链转移反应和出色的调节能力。最终的光敏聚合物网络显示出改进的机械性能，从而使EVS成为3D打印坚韧光敏聚合物的出色候选者。和光反应器研究用于阐明EVS的快速链转移反应和出色的调节能力。最终的光敏聚合物网络显示出改进的机械性能，从而使EVS成为3D打印坚韧光敏聚合物的出色候选者。

更新日期：2018-06-20

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