水溶性三嗪衍生物的合成及其用于纤维素改性的研究

Synthesis of benzoic sulfonic triazine and its use in the modification of cellulose

以三聚氯氰(TCT)、对羟基苯磺酸为原料,合成了水溶性的2,4-二(4-羟基苯磺酸钠)-6-氯-1,3,5-三嗪(DPHACT);通过红外光谱和质谱表征其结构。将DPHACT用于微晶纤维素(MCC)的修饰,并将修饰后的微晶纤维素于130℃、固液比为1∶20的条件下用8%(wt,质量分数,下同)H2SO4水解5h。研究DPHACT用量对纤维素微晶结构和水解性能的影响。实验结果表明,经DPHACT改性后的微晶纤维素水解后还原糖的得率有所提高,当DPHACT相对摩尔含量为6.25%时,微晶纤维素水解后还原糖的得率最大(12.42%);通过分析广角X射线衍射图发现,经DPHACT改性后,微晶纤维素的结晶结构发生了变化:无定形取含量增加,结晶指数下降,晶粒尺寸减小。

A water-soluble triazine derivate,namely 2,4-di（4-hydroxylbenzoic acid）-6-chloro-1,3,5-triazine（DPHACT）was synthesized from cyanuric chloride（TCT）and 4-hydroxyl-benzoic sulfonic acid.FT-IR and mass spectrum（MS）were adopted to characterize its structure.Microcrystalline cellulose（MCC）was modified with DPHACT and the modified MCC was hydrolyzed at 130℃ with 8wt% H2SO4 for 5hours（W/V=1∶20）.The influence of DPHACT＇s dosage on the structure and hydrolysis properties of microcrystalline cellulose was studied.The results showed that,the yield of the reducing sugar of hydrolysis of modified microcrystalline cellulose increased with the dosage of DPHACT.The yield was 12.42%wt as the DPHACT was 6.25%mol.Wide Angle X-ray Diffraction（WAXD）indicated that crystal structure of the modified microcrystalline celluloses was changed：the content of amorphous region increased,the crystallinity index decreased,and the grain size reduced.