首页> 外文期刊>RSC Advances >Inter molecular azide-diisocyanate coupling: new insights for energetic solid propellants
【24h】

Inter molecular azide-diisocyanate coupling: new insights for energetic solid propellants

机译:Inter分子叠氮化物 - 二异氰酸酯偶联:充满活力的固体推进剂的新见解

获取原文
获取原文并翻译 | 示例
           

摘要

Hydroxyl terminated azide binders can undergo a spurious reaction with diisocyanates to form tetrazoline-5-one via an inter molecular 1,3-dipolar cycloaddition reaction apart from urethane/allophanate groups which has been overlooked. This has serious implications on solid propellants. The computed activation barrier using density functional theory (DFT) for urethane formation reaction is 28.4 kJ mol(-1) and that for tetrazoline-5-one formation reaction is 108.0 kJ mol(-1). DFT studies reveal that the rate limiting step of the reaction is 1,3-dipolar cycloaddition between azide and isocyanate. A dual cure was observed in the temperature ranges 42-77 degrees C and 78-146 degrees C by differential scanning calorimetry (DSC) and rheological studies, confirming multiple reactions. Tetrazoline-5-one formation was confirmed by Fourier transform infrared spectroscopy (FTIR) and solid state nuclear magnetic resonance spectroscopy (NMR).
机译:羟基封端的叠氮化物粘合剂可以通过除去的氨基甲酸酯/联苯磺酸基团的分子1,3-偶极环加入反应来经过二异氰酸酯进行杂散反应以形成四唑啉-5-一。 这对固体推进剂具有严重影响。 使用密度官能理论(DFT)的计算的激活屏障为氨基甲酸酯形成反应是28.4kJ摩尔(-1),对于四唑啉-5-单个形成反应是108.0kJ摩尔(-1)。 DFT研究表明,反应的速率限制步骤是叠氮化物和异氰酸酯之间的1,3-偶极环加成。 通过差示扫描量热法(DSC)和流变研究,在温度42-77摄氏度和78-146摄氏度中观察到双重固化,证实多重反应。 通过傅里叶变换红外光谱(FTIR)和固态核磁共振光谱(NMR)确认四唑啉-5-一种形成。

著录项

  • 来源
    《RSC Advances》 |2015年第62期|共5页
  • 作者单位

    Vikram Sarabhai Space Ctr ISRO Polymers &

    Special Chem Grp Thiruvananthapuram 695022 Kerala India;

    Vikram Sarabhai Space Ctr ISRO Analyt Spect &

    Ceram Grp Thiruvananthapuram 695022 Kerala India;

    Vikram Sarabhai Space Ctr ISRO Analyt Spect &

    Ceram Grp Thiruvananthapuram 695022 Kerala India;

    Vikram Sarabhai Space Ctr ISRO Analyt Spect &

    Ceram Grp Thiruvananthapuram 695022 Kerala India;

    Indian Inst Sci Dept Inorgan &

    Phys Chem Bangalore 560012 Karnataka India;

    Vikram Sarabhai Space Ctr ISRO Polymers &

    Special Chem Grp Thiruvananthapuram 695022 Kerala India;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 化学;
  • 关键词

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