Abstract

The laser induced curing of acryloxy terminated ethyleneoxide dimethylsiloxane-ethyleneoxide ABA block copolymer (PDMS-AO) and (3-glycidoxypropyl)trimethoxysilane (GPTMS) was carried out with 2-hydroxy-2-methylpropiophenone as radical photoinitiator and p-(octyloxyphenyl)phenyliodonium hexafluoroantimonate as cationic photoinitiator, respectively. The cross-linking mechanisms for both mixtures were determined through monitoring of photocuring by SSNMR, FTIR and Raman spectroscopies. The obtained silicone rubbers were tested by swelling measurements and thermogravimetric analysis. In comparison with PDMS-AO, cross-linked GPTMS had slightly more cross-linking density (by approximately 20% more). The cross-linked GPTMS was more thermally stable in air than cured PDMS-AO (by c.a. 190° C) due to both mechanisms: epoxy polymerization and Si–O–Si formation. The possibility of laser printing with defined framework for PDMS-AO was successfully demonstrated that allows obtaining laser printed polymer objects.

Graphical abstract

中文翻译：

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激光印刷应用中功能性聚硅氧烷自由基和离子光固化的结构特征

摘要

丙烯酰氧基的激光诱导固化封端的环氧乙烷二甲基硅氧烷-环氧乙烷ABA嵌段共聚物（PDMS-AO）和（3-环氧丙氧基丙基）三甲氧基硅烷（GPTMS）与2-羟基-2-甲基苯丙酮作为自由基光引发剂，并进行了p-（辛氧基苯基）苯基碘鎓六氟锑酸盐分别作为阳离子光引发剂。通过SSNMR，FTIR和拉曼光谱学监测光固化，确定两种混合物的交联机理。通过溶胀测量和热重分析测试所获得的硅橡胶。与PDMS-AO相比，交联的GPTMS的交联密度略高（大约高出20％）。交联的GPTMS在空气中的热稳定性高于固化的PDMS-AO（在190°C左右），这是由于两种机理：环氧聚合和Si-O-Si形成。已经成功证明了用PDMS-AO定义的框架进行激光打印的可能性，该方法允许获得激光打印的聚合物物体。

图形概要