• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Journal of Applied Polymer Science >PREPARATION AND PROPERTIES OF UV-CURABLE POLYURETHANE ACRYLATES
【24h】

PREPARATION AND PROPERTIES OF UV-CURABLE POLYURETHANE ACRYLATES

机译：紫外光固化聚氨酯丙烯酸酯的制备及性能

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

UV-curable polyurethane (PU) acrylates have been synthesized from polypropylene glycol (PPG), isophorone diisocyanate (IPDI), and three types of reactive diluents, i.e., 2-hydroxyethylacrylate (HEA), tripropyleneglycol diacrylate (TPGDA), and trimethylolpropane triacrylate (TMPTA). The effects of soft segment length, type, and concentration of reactive diluent on the mechanical and dynamic mechanical properties have been determined. When the soft segment length was short (750) tensile strength (sigma(b)) decreased, and elongation at break (epsilon(b)) generally increased with increasing HEA concentration, due respectively to the inferior strength of HEA homopolymer, and increased molecular weight between crosslinks (M(c)). Initial modulus (E) and ab increased and elongation at break (epsilon(b)) decreased with the increase of TPGDA concentration, and the effect was more pronounced as the soft segment length decreased. The hardness and sigma(b) increase with diluent concentration in PPG 2000-based materials was more pronounced with higher functionality diluent, due to the increased crosslinking density. The lower temperature glass transition peak of PU was not influenced by the TPGDA incorporation, whereas the higher temperature one moved toward still higher temperature. This was interpreted in terms of possible compatibility of hard segments and acrylates due to their similar polarity and hydrogen bonding. (C) 1996 John Wiley & Sons, Inc. [References: 27]
机译：UV固化聚氨酯（PU）丙烯酸酯是由聚丙二醇（PPG），异佛尔酮二异氰酸酯（IPDI）和三种类型的反应性稀释剂合成的，即丙烯酸2-羟乙酯（HEA），三丙烯酸三丙二醇酯（TPGDA）和三羟甲基丙烷三丙烯酸酯（ TMPTA）。已经确定了软链段长度，反应性稀释剂的类型和浓度对机械和动态机械性能的影响。当软链段长度短（750）时，抗张强度（sigma（b））降低，断裂伸长率（ε（b））通常随HEA浓度的增加而增加，这分别是由于HEA均聚物的强度较差和分子的增加交联之间的权重（M（c））。随着TPGDA浓度的增加，初始模量（E）和ab增大，断裂伸长率（epsilon（b））减小，并且随着软链段长度的减小，这种影响更加明显。在PPG 2000基材料中，随着稀释剂浓度的增加，硬度和σ（b）随功能性稀释剂的增加而增加，这是由于交联密度增加所致。 PU的较低玻璃化转变峰不受TPGDA掺入的影响，而较高的温度则向更高的温度移动。这是由于硬链段和丙烯酸酯由于极性和氢键相似而可能具有的相容性来解释的。 （C）1996 John Wiley＆Sons，Inc. [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