摘要
以苯酚、尿素和甲醛为起点合成了一种苯酚—尿素—甲醛共缩聚 ,并对树脂性能和结构进行了全面分析评估。结果表明所合成的共缩聚树脂贮存稳定 ,固化速度快 ;差热分析和热重分析表明苯酚—尿素—甲醛共缩聚树脂的热行为与酚醛树脂十分相似而与脲醛树脂显著不同 ;13 CNMR结构分析中分别观测到源于共缩聚结构单元o -Ph -CH2 -NHCO -(δ =4 1 .5)和 p -Ph -CH2 -NHCO -(δ =4 4.8)的吸收 ;使用PUF共缩聚树脂压制的竹木复合中密度纤维板和竹大片刨花板 ,其板材的物理力学性能明显高于脲醛树脂而与常规酚醛树脂相近。
A new synthetic method to obtain resol\|type phenol\|urea\|formaldehyde resins was developed by reacting phenol, urea and formaldehyde. The properties and structure of products were analyzed. The result showed that stability of the cocondensed resin was improved, and solidification rate of the phenolic resin was accelerated. The cocondensed resin appeared similar thermal properties with normal PF resins, different greatly with UF resin. The cocondensates were analyzed with carbon 13 nuclear magnetic resonance ( 13 CNMR) spectroscopy, o-Ph-CH\-2-NHCO-( δ =41.5) and p-Ph-CH\-2-NHCO-( δ =44.8) were observed. Properties of MDF (medium density fibreboard) and waferboard bonded with PUF were similar with boards bonded with normal PF resins, superior to boards bonded with UF resins.
出处
《林业科学》
CAS
CSCD
北大核心
2000年第5期73-77,共5页
Scientia Silvae Sinicae
基金
云南省中青年学术及技术带头人专项经费资助
