苯氧基二氯均三嗪改性纤维素的合成与水解

Synthesis and Hydrolysis of Phenoxy Triazine Dichloride Modified Cellulose

以三聚氯氰(TCT)、苯酚为原料,合成2,4-二氯-6-苯氧基-1,3,5-三嗪衍生物(PHCT);通过红外光谱和质谱表征其结构。用PHCT对纤维进行修饰,并将修饰后的微晶纤维素在8%(wt)H2SO4中、130℃下水解5 h,研究PHCT用量对纤维素水解性能和结晶结构的影响;实验结果表明,经PHCT改性的纤维素水解后的还原糖得率提高了,当PHCT相对摩尔含量(以葡萄糖环计)为16.67%时,纤维素水解成还原糖得率最大为23.54%;通过分析广角X射线衍射图发现,PHCT改性使微晶纤维素的结晶结构发生变化,无定形区增加,结晶指数下降,晶粒尺寸减小。

The purpose of this paper is to improve the yield of hydrolysis by the crystal structural change of cellulose based on chemical modification. A new 1,3,5-triazine derivative 2,4-dichloro- 6-phenoxyl- 1,3,5-triazine （PHCT） was synthesized from phenol and 2,4,6-trichloro- 1,3,5-triazine （TCT）. The structure of PHCT was characterized with FT-IR and LC-MS spectra. Microcrystalline cellulose （MCC） was chemically modified with PHCT and the modified MCC was hydrolyzed to study the impact of the amount of PHCT on the crystal structure and the hydrolysis property of cellulose. The hydrolysis of the modified cellulose was carried on in the sulfur acid of which the concentration was 8%, at the temperature of 130℃ and with the duration of 5 hours. The yield of the reducing sugar is about 23%, which is the highest in the present study, as the relative molar percentage of PHCT in cellulose （by the cellulosic glucose ring） is 16.67%. The wide X-ray diffractometer spectra show that the crystalline structure of cellulose is changed a lot by chemical modification, which is considered being beneficial for the hydrolysis of cellulose.