摘要
首先用马来酸酐(MA)对亚麻纤维(FF)进行化学接枝,得到MA-FF,然后用Na2CO3溶液处理MA-FF,得到Na+阻燃改性的FF,用Na2CO3-MA-FF表示。FTIR中羰基峰的出现证明了MA接枝到FF上;用酸碱滴定法测定了MA在FF上的接枝率(Gd);用极限氧指数(LOI)和垂直燃烧评价了Na+对FF的阻燃效果,用XRD分析了FF结晶度的变化。结果表明:105℃下,m(MA)∶m(FF)=48∶60的原料在DMF溶液中反应2.4 h,MA在FF上的接枝率达到71%~75%;Na2CO3-MA-FF的阻燃性随着Na+含量增加而提高,20 g/L Na2CO3溶液处理的MA-FF(记为20-Na2CO3-MA-FF)的LOI值由20%提高到28.9%,续燃时间由43 s降低到0 s,损毁长度由30 cm降低到8.3 cm;MA接枝后,FF结晶度由66.7%提高到75.0%,20-Na2CO3-MA-FF结晶度稍降到71.8%,但是XRD中2q角没有变化,均为14.8°、16.7°和22.8°。
Flax fiber(FF)was grafted chemically with maleic anhydride(MA)to give MA-FF,and then treated with sodium carbonate solution to produce the flame retardant modified FF with Na+(Na2CO3-MA-FF).The grafting degree(Gd)of MA on FF was determined by acid-base titration.The flame retardant effect of Na+on FF was evaluated by limiting oxygen index(LOI)and vertical burning test.The FF crystallinity was analyzed by XRD.The results showed that when MA and FF with a mass ratio of 48∶60 reacted for 2.4 h in DMF at 105℃,the Gd of MA-FF reached ranging from 71%to 75%.The flame retardancy of Na2CO3-MA-FF increased with the increase of Na+content.The LOI value,afterflame time and damaged length of 20-Na2CO3-MA-FF(MA-FF was treated with 20 g/L Na2CO3 aqueous)were 28.9%,0 s,and 8.3 cm,higher than the corresponding values of MA-FF(20%,43 s and 30 cm).After MA grafting,the FF crystallinity increased from 66.7%to 75.0%,while that of 20-Na2CO3-MA-FF was slightly reduced to 71.8%.However,the 2θangles had no change,were all still 14.8°,16.7°and 22.8°.
作者
姜大伟
徐庆玲
任彪彪
王垣衡
孙才英
JIANG Da-wei;XU Qing-ling;REN Biao-biao;WANG Yuan-heng;SUN Cai-ying(Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials,Department of Chemistry,Northeast Forestry University,Harbin 150040,Heilongjiang,China)
出处
《精细化工》
EI
CAS
CSCD
北大核心
2019年第9期1809-1815,共7页
Fine Chemicals
基金
中国博士后科学基金面上资助项目（2016M601402）
中央高校基本科研业务费专项资金项目（2572018BC27）
黑龙江省青年科学基金项目（QC2017038）
黑龙江省博士后特别资助项目（博士后青年英才计划）（LBH-TZ13）
黑龙江省政府博士后资助项目（LBH-Z16004）
关键词
亚麻纤维
接枝
阻燃
马来酸酐
Na+
功能材料
flax fiber grafting
grafting
flame retardant
maleic anhydride
Na+
functional materials
