论文部分内容阅读
以纤维素为原料,通过二氧化氮和过碘酸化学氧化方法,在不同的低取代度条件下,有选择性地在纤维素葡萄糖残基的不同碳原子部位导入特定的取代基(羧基和二醛基),探讨不同的取代基对纤维素生物降解性能的影响;并将处理后所得的纤维素试料,通过土壤埋没,利用土壤中的微生物自然降解,然后测定分子量的变化,定量分析纤维素在不同取代基、不同程度化学处理后,其生物降解性能的变化.实验结果表明:(1)在纤维囊葡萄糖残基C_6位轻度导入一定量(3%)的羧基,对纤维素的生物降解性能无不利影响,进一步导入羧基(含量15%),则其生物降解性能有明显提高;(2)在葡萄糖残基C_2,C_3位导入适量(10%左右)的二醛基,有利于纤维素生物降解性能的提高.
Using cellulose as the raw material, specific substituents (carboxyl groups and carboxyl groups) were selectively introduced into the different carbon atoms of cellulose glucose residues under different low-substitution conditions by means of nitrogen dioxide and periodic acid chemical oxidation Dialdehyde) to investigate the effect of different substituents on the biodegradability of cellulose. The treated cellulose samples were buried in the soil and naturally degraded by microorganisms in the soil, and then the changes of the molecular weights were determined and quantitatively analyzed The results showed that: (1) A certain amount (3%) of carboxyl groups were slightly introduced into C_6 of glucose depots of cellulose fibers, and cellulose Biodegradability without adversely affecting the further introduction of carboxyl (content of 15%), the biodegradability significantly improved; (2) glucose residues C_2, C_3 position into the right amount (10%) of the dialdehyde, there Conducive to the improvement of cellulose biodegradability.