...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Polymer engineering and science >New Epoxy Thermosets Obtained From Diglycidylether of Bisphenol A and Modified Hyperbranched Polyesters With Long Aliphatic Chains Cured by Diisocyanates
【24h】

New Epoxy Thermosets Obtained From Diglycidylether of Bisphenol A and Modified Hyperbranched Polyesters With Long Aliphatic Chains Cured by Diisocyanates

机译：从双酚A的二缩水甘油醚和具有长脂肪链的二异氰酸酯固化的改性超支化聚酯获得新的环氧热固性材料

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

Hyperbranched polyesters modified with long aliphatic chains with vinyl or epoxy groups as chain ends were synthesized and added as modifiers to diglycidyl ether of bisphenol A/toluene-2,4-diisocyanate mixtures in the presence of benzyldimethylamine as catalyst. The influence of the addition of these modifiers on the curing was investigated by thermal analysis and infrared spectroscopy. The materials obtained were investigated by electron microscopy and some mechanical characteristics were determined by nanoindentation tests. Epoxy terminated hyperbranched led to homogeneous materials with high crosslinking densities, whereas vinyl terminated hyperbranched produced phase separated morphologies. The materials showing phase separation presented a tough fracture, whereas the homogeneous materials obtained with epoxidated hyperbranched showed increased brittleness on increasing the proportion of modifier. On increasing the proportion of vinyl terminated hyperbranched in the thermosets, Young's modulus and hardness decreased but the addition of epoxy terminated hyperbranched did not influence these parameters. The addition of vinylic hyperbranched to the formulations produced a decrease in the curing shrinkage, whereas the epoxidic hyperbranched did not.
机译：合成以乙烯基或环氧基为链端的长脂肪族链改性的超支化聚酯，并在苄基二甲胺作为催化剂的情况下，将其作为改性剂添加到双酚A /甲苯-2,4-二异氰酸酯混合物的二缩水甘油醚中。通过热分析和红外光谱研究了添加这些改性剂对固化的影响。通过电子显微镜研究获得的材料，并通过纳米压痕测试确定一些机械特性。环氧封端的超支化导致具有高交联密度的均质材料，而乙烯基封端的超支化产生相分离的形态。表现出相分离的材料表现出坚韧的断裂，而通过环氧化超支化获得的均质材料在增加改性剂比例时显示出增加的脆性。随着热固性材料中乙烯基封端超支化比例的增加，杨氏模量和硬度降低，但环氧封端超支化的添加不会影响这些参数。向配方中添加乙烯基超支化可降低固化收缩率，而环氧超支化则不会。

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