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Digital light processing 3D printing of modified liquid isoprene rubber using thiol-click chemistry

机译:数字光处理3D使用硫醇咔哒化学改性液体异戊二烯橡胶的3D印刷

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摘要

This study highlights the additive manufacturing of diene-rubbers with digital light processing (DLP). The network formation relies on the crosslinking of a methacrylate-functional liquid isoprene rubberviaphoto-induced thiol-click chemistry. Bi-functional divinyl ethers are added as reactive diluents, which benefit from a low potential for skin irradiation and skin sensitization. Along with significantly reducing the viscosity, the divinyl ethers accelerate the cure kinetics of the diene-rubber across the main chain C & xe001;C bonds of the isoprene units. Photo-DSC measurements reveal that the length of the glycol-spacer and the chemical structure (glycolversusalkyl) of the divinyl ether influence the photo-reactivity of the rubber formulations in thiol-ene reactions. In the present study, the highest reactivity is observed for tri(ethylene glycol) divinylether comprising a spacer with three glycol units. To improve the storage stability of the rubber formulation, a radical scavenger is applied to reduce premature crosslinking reactions under dark conditions. With the stabilized liquid rubber formulations, precise 3D structures with features of 0.5 mm are successfully manufactured with bottom-up DLP 3D printing.
机译:本研究突出了具有数字光处理(DLP)二烯 - 橡胶的添加剂制造。网络形成依赖于甲基丙烯酸酯 - 官能液体异戊二烯橡皮橡胶蛋白诱导的硫醇咔哒化学的交联。双官能二乙烯基醚作为反应性稀释剂加入,这受益于皮肤照射和皮肤敏化的低潜力。随着粘度的显着降低,二乙烯基醚将二烯 - 橡胶的固化动力学加速到主链C和XE001中的二烯 - 橡胶; C键的异戊二烯单元键。 Photo-DSC测量揭示了二甘醇 - 间隔物的长度和二乙烯基醚的化学结构(甘油渣烷基)影响硫醇 - 烯丙基反应中橡胶配方的光反应性。在本研究中,对于三种二甘醇单元的间隔物,观察到三种(乙二醇)二乙醚的最高反应性。为了提高橡胶配方的储存稳定性,应用自由基清除剂以减少暗条件下的过早交联反应。通过稳定的液体橡胶配方,通过自下而上的DLP 3D打印成功地制造具有0.5毫米特性的精确3D结构。

著录项

  • 来源
    《RSC Advances》 |2020年第40期|共8页
  • 作者单位

    Polymer Competence Ctr Leonen A-8700 Leonen Austria;

    Polymer Competence Ctr Leonen A-8700 Leonen Austria;

    Polymer Competence Ctr Leonen A-8700 Leonen Austria;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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