• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>RSC Advances >Cardanol benzoxazines - interplay of oxazine functionality (mono to tetra) and properties
【24h】

Cardanol benzoxazines - interplay of oxazine functionality (mono to tetra) and properties

机译：腰果酚苯并恶嗪-恶嗪官能团（单至四）和性质的相互作用

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

Cardanol, a sustainable origin phenol, was utilized as a reactive diluent to mediate solventless Mannich-type condensation reaction with para-formaldehyde and primary aromatic amines to form a homologous series of benzoxazine (Bz) monomers namely C-a, C-ddm, C-trisapm and C-tetraapm which differ in their degree of oxazine functionality as mono-, di-, tri- and tetra-oxazine respectively. A strong correlation is reflected between the number of oxazine rings in the monomer and the polymerization behavior, thermo-mechanical transitions, and properties of the polybenzoxazine synthesized. The monomer structure was confirmed by FTIR, H-1-, C-13-NMR spectroscopy and mass spectrometry. The curing, rheological, thermo-mechanical and thermal properties were determined using DSC, FTIR, rheometer, DMTA, LSS and TGA studies. The curing characteristic due to ROP of Bz monomers was supported both by DSC and FTIR studies. The presence of neighboring oxazine group in monomers (C-a to C-tetraapm) strongly attenuates the curing temperature (T-i = 225-140 degrees C), enhances T-g, thermal stability, and mechanical properties. Interestingly, DFT calculations also supported the lowest curing temperature for highest oxazine functionality monomer (C-tetraapm). The interplay between the degree of oxazine functionality in the monomer; extent of H-bonding and crosslink density values in sustainable origin synthesized polybenzoxazines is suggested. The thermoset showed an increasing trend (PC-a < PC-ddm < PC-trisapm < PC-tetraapm) in T-g (58-109 degrees C), thermal stability (355-391 degrees C), char yield (13-37%), LOI (23-31) and storage modulus (3.6-66.5 MPa) values. The monomers are liquid to semi-viscous paste at room temperature and showed potential for solventless processing in adhesive applications.
机译：腰果酚，一种可持续来源的苯酚，被用作反应性稀释剂来介导无溶剂的曼尼希型与对甲醛和伯芳族胺的缩合反应，以形成同源系列的苯并恶嗪（Bz）单体，即Ca，C-ddm，C-trisapm和C-tetraapm的恶嗪官能度分别不同，分别为一，二，三和四恶嗪。单体中的恶嗪环数与聚合行为，热机械转变和合成的聚苯并恶嗪的性能之间反映出很强的相关性。通过FTIR，H-1-，C-13-NMR光谱和质谱确认单体结构。使用DSC，FTIR，流变仪，DMTA，LSS和TGA研究确定固化，流变，热机械和热性能。 DSC和FTIR研究均支持了由Bz单体的ROP引起的固化特性。单体（C-a至C-tetraapm）中相邻的恶嗪基团的存在会大大降低固化温度（T-i = 225-140摄氏度），提高T-g，热稳定性和机械性能。有趣的是，DFT计算还支持了最高的恶嗪官能团单体（C-tetraapm）的最低固化温度。单体中恶嗪官能度之间的相互作用;建议在可持续来源合成的聚苯并恶嗪中氢键的程度和交联密度值。热固性塑料在Tg（58-109摄氏度），热稳定性（355-391摄氏度），焦炭收率（13-37％）方面呈上升趋势（PC-a

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