首页> 外文期刊>Journal of Applied Polymer Science >THE EFFECTS OF PROCESSING VARIABLES ON STRESS DEVELOPMENT IN ULTRAVIOLET-CURED COATINGS
【24h】

THE EFFECTS OF PROCESSING VARIABLES ON STRESS DEVELOPMENT IN ULTRAVIOLET-CURED COATINGS

机译:加工变量对紫外线固化涂层中应力发展的影响

获取原文
获取原文并翻译 | 示例
           

摘要

A cantilever deflection technique was used to monitor stress development during ultraviolet photo-cure of acrylate coatings to the glassy state. Two coating systems were studied: a trifunctional monomer (trimethylol propane triacrylate, TMPTA) and a tetrafunctional monomer (pentaerythritol tetraacrylate, PETA). Both were photoinitiated with 2,2-dimethoxy-2-phenylacetophenone (DMPA). Average in-plane stresses of up to 30 MPa were measured upon curing at room temperature. The rate and magnitude of stress development rose with the photoinitiator concentration and with light intensity. Curing with more strongly absorbed light had similar effects. Light absorption caused decreased stress magnitudes in thicker coatings. Somewhat unexpectedly, the rate and magnitude of stress development increased with monomer functionality even though the conversion fell. Moreover, curing thick coatings with high radical concentrations (strongly absorbing light and large photoinitiator concentrations) caused ripple defects to form. With the appearance of these defects, stress ceased to rise with the photoinitiator concentration. Fourier transform infrared spectroscopy was employed to monitor conversion and to help understand these stress development trends. (C) 1997 John Wiley & Sons. [References: 27]
机译:悬臂偏转技术用于监测丙烯酸酯涂层紫外线固化至玻璃态期间的应力发展。研究了两种涂料体系:三官能单体(三羟甲基丙烷三丙烯酸酯,TMPTA)和四官能单体(季戊四醇四丙烯酸酯,PETA)。两者均用2,2-二甲氧基-2-苯基苯乙酮(DMPA)光引发。在室温下固化时测得的平均面内应力高达30 MPa。应力发展的速率和幅度随光引发剂浓度和光强度而增加。用更强吸收的光进行固化具有相似的效果。光吸收导致在较厚的涂层中应力强度降低。出乎意料的是,即使转化率下降,应力发展的速率和幅度也随单体官能度的增加而增加。此外,固化具有高自由基浓度的厚涂层(强烈吸收光和高光引发剂浓度)会导致形成波纹缺陷。随着这些缺陷的出现,应力随着光引发剂浓度的增加而停止升高。傅里叶变换红外光谱仪用于监测转化率并帮助理解这些应力发展趋势。 (C)1997年John Wiley&Sons。 [参考:27]

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号