摘要
应用超滤分级方法,将麦草碱木素分成3种不同分子量范围的级分。分析表明:随着分子量的降低,麦草碱木素的甲氧基含量降低,酚羟基含量升高,其反应活性随之升高;同时,羧基含量降低,其溶液表面活性升高。进一步实验结果表明,随着麦草碱木素分子量的降低,LPF胶的胶黏强度升高,游离甲醛含量和黏度降低,综合性能提高。
The wheat straw soda lignin （WSSL） was fractionated by means of ultrafiltration, and 3 fractions of different molecular weights were collected.It was shown that with the decrease in molecular weight of WSSL, the content of methoxyl group decreased and the content of phenolic hydroxyl group increased, resulting in increased reactivity of WSSL, while the content of carboxyl group decreased, resulting in increased surface activity of WSSL solution.The results showed that with the decrease in molecular weight of WSSL, the adhesive strength of lignin phenol formaldehyde （LPF） adhesive increased, the formaldehyde content and viscosity decreased, and the comprehensive properties of LPF adhesive were improved.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2008年第6期1590-1594,共5页
CIESC Journal
基金
广东省自然科学基金重点基金项目(05103536)~~
关键词
木质素
酚醛树脂
分子量
胶黏剂
lignin
phenol formaldehyde resin
molecular weight
adhesive
