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首页> 外文会议>North American Thermal Analysis Society Conference >Effect of Oxygen on the Crosslinking and Mechanical Properties of a Thermoset Formed By Free-Radical Photocuring
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Effect of Oxygen on the Crosslinking and Mechanical Properties of a Thermoset Formed By Free-Radical Photocuring

机译：氧对通过自由自由基光固化形成的热固性的交联和力学性能的影响

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In this paper we report on the formation of optically transparent photopolymer films from hexanediol-diacrylate (HDDA) by inkjet printing, where droplets of monomer approximately 5μm in diameter are deposited onto a surface. The films are cured by irradiation with a UV LED light source. Their chemical reaction, as well as their thermal and mechanical characteristics were determined by differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA). As the droplets are ejected from the inkjet nozzle they are exposed to an ambient air atmosphere. Under these circumstances, oxygen is incorporated into the film as the droplets merge, having a detrimental, inhibiting effect on the polymerization. We found that atmospheric oxygen not only affected the rate of photoreaction of HDDA, but it also affected cross-linking that occurred both during photocuring and in the dark during subsequent thermal postcuring. Thus, O_2 played a significant role in both film formation and during the subsequent characterization of the mechanical properties of the films by DMA.
机译：在本文中，我们通过喷墨印刷报告从己二醇 - 二丙烯酸酯（HDDA）的光学透明光聚合物膜的形成，其中将大约5μm的单体液滴沉积在表面上。通过用UV LED光源照射来固化膜。通过差示扫描量热法（DSC）和动态机械分析（DMA）确定它们的化学反应及其热和机械特性。由于液滴从喷墨喷嘴喷射，因此它们暴露于环境空气气氛。在这种情况下，氧气掺入薄膜中，因为液滴合并，具有对聚合的有害抑制作用。我们发现大气氧不仅影响了HDDA的光学速度，而且还影响了在随后的热后皮下照相和黑暗中发生的交联。因此，O_2在两种膜形成和随后表征DMA的后续表征膜的机械性能期间发挥了重要作用。

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