水气吸附法评定树脂残碳密实度

Compactness of Residual Char of Resins by Moisture Adsorption Method

通过水气吸附法研究了树脂残碳的密实度,以S-157酚醛树脂、Q-913酚醛树脂、硼酚醛环氧树脂体系等6种树脂为例进行说明,把6种固化树脂粉体在氮气气氛中热解成碳,把残碳移入控制温湿度的实验环境内放置,采用高精度的天平称量残碳不同时刻的质量变化,经过约200 min的残碳吸附过程分析,获得残碳吸附空气中的水气达到平衡后,树脂残碳在控制温湿度的环境条件下质量变化率与时间的关系,通过比较残碳的增重对其密实度进行评定。采用扫描电子显微镜对残碳表面进行观察验证。结果表明:水气吸附能力可反映树脂残碳的密实度,在规定温湿度环境内吸附平衡时,水气吸附量为残碳密实度的评定依据。

The compactness of resin was studied by the moisture adsorption method in the paper. The research process was explained by six kinds of resins, including S-157 phenol resin, Q-913 phenol resion and boron modified phenol resin etc. Six kinds of resins were decomposed to get different residual chars under the protection of nitrogen atmosphere. The re- sidual chars were transferred and placed under a laboratory with the controlled humidity and temperature. The weight chan＇ ges of several residual chars were weighed up by a balance with the precision of 0. 001 milligram. The compactness of resid- ual chars were compared by their increment after adsorption balance of moisture. The relation of the mass change with in- crement of six residual chars was gotten after a interval of 200 minute moisture adsorption, The microscope structure of resid- ual char was observed by electron scanning microscope, and the compactness in microstructure is in accordance with the a- bility of moisture adsorption.