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首页> 外文期刊>Journal of Applied Polymer Science >Photopolymerization kinetics of an epoxy-based resin for stereolithography
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Photopolymerization kinetics of an epoxy-based resin for stereolithography

机译：环氧树脂用于立体光刻的光聚合动力学

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摘要

Curing reactions of photoactivated epoxy resins are assuming an increasing relevance in many industrial applications, such as coatings, printing, and adhesives. Besides these processes, stereolithography (SL) makes use of photoactivated resins in a laser-induced polymerization for 3D building. The kinetic behavior of photocuring is a key point for full comprehension of the cure conditions occurring in the small zone irradiated by the laser beam during the building process. Furthermore, the kinetic analysis is very important to determine the cure time needed for part building in a stereolithographic equipment. The mechanisms involved in a cationic photopolymerization are complex compared with radical photopolymerization. In this paper the photoinitiated polymerization of a commercially available epoxy-based resin for stereolithography (SL5170) was studied by means of differential scanning calorimetry (DSC) and Fourier transform infrared spectroscopy (FTIR). Substantial information about the SL5170 chemical composition and curing mechanism was determined through FTIR analysis. The polymerization rate and the maximum degree of reaction were determined directly from experimental DSC curves. Kinetic characterization of epoxy photopolymerization was carried out as a function of the temperature and irradiation intensity and experimental results were compared with an original mathematical model. (C) 2004 Wiley Periodicals, Inc.
机译：在许多工业应用中，例如涂料，印刷和粘合剂，光活化环氧树脂的固化反应正变得越来越重要。除了这些过程之外，立体光刻（SL）在激光诱导的3D建筑物聚合中还使用了光活化树脂。光固化的动力学行为是全面了解在构建过程中激光束照射的小区域中发生的固化条件的关键。此外，动力学分析对于确定立体光刻设备中零件制造所需的固化时间非常重要。与自由基光聚合相比，参与阳离子光聚合的机理很复杂。在本文中，通过差示扫描量热法（DSC）和傅里叶变换红外光谱（FTIR）研究了市售的用于立体光刻的环氧基树脂（SL5170）的光引发聚合。通过FTIR分析确定了有关SL5170化学成分和固化机理的大量信息。聚合速率和最大反应度直接由实验DSC曲线确定。根据温度和辐照强度进行了环氧光聚合反应的动力学表征，并将实验结果与原始数学模型进行了比较。 （C）2004年Wiley Periodicals，Inc.

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