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为了了解碱性环境中苯酚-尿素-甲醛(PUF)共缩聚树脂结构形成规律,为PUF树脂结构控制提供依据,使用13C NMR表征,采用分次加入苯酚、甲醛和尿素的技术路线,定量分析了PUF树脂合成过程中各种官能团的变化和聚合物分子链的构成。结果表明,碱性环境中各种加料方式合成的PUF树脂初聚物具有十分相近的化学结构,PUF树脂也具有十分相近的化学结构,但结构组分存在差异,在原料物质的量之比一定的条件下,最终反应进程基本接近。甲醛分次加入,减少了醚类的生成,有利于简化反应进程。初聚物的热机械性能分析表明不同加料方式对酚醛树脂固化性能无显著影响。
In order to understand the formation regularity of phenol-urea-formaldehyde (PUF) co-polycondensation resin in alkaline environment and provide the basis for structural control of PUF resin, 13C NMR characterization was used. The technical route of adding phenol, formaldehyde and urea by fractionation was quantitatively analyzed PUF resin synthesis process of various functional groups and polymer molecular chain changes. The results show that PUF resin precursors synthesized by various feeding methods in alkaline environment have very similar chemical structures and PUF resins have very similar chemical structures, but the structural components are different. When the ratio of the amount of raw materials is constant Conditions, the final reaction process is basically close. Formaldehyde added in order to reduce the generation of ethers, help to simplify the reaction process. Thermomechanical properties of the first polymer analysis showed that different feeding methods have no significant effect on the curing properties of phenolic resin.