蒸汽爆破预处理对毛竹化学组成和纤维形态的影响

Effects of steam-explosion pretreatment on chemical constitute and fiber conformation of bamboo

以毛竹为研究对象,采用蒸汽爆破法进行预处理并对爆破前后化学组成和纤维形态的变化进行分析,以及GC-MS技术对爆破后的降解产物进行鉴定。结果表明:(1)蒸汽爆破预处理使得半纤维素含量大幅度降低,纤维素含量相对增加,木质素含量稍有变化;(2)爆破后纤维长度降低,纤维表面明显有碎片和裂纹,爆破后的纤维相对结晶度明显提高;(3)毛竹爆破液的乙酸乙酯萃取物中,共鉴别出以戊二酸二乙酯为主的32种化合物。

Steam-explosion pretreatment technology was used for pretreating the bamboo in this paper. The difference of the chemical composition and fiber morphology of bamboo before and after the explosion was studied, and the degraded products were analyzed by using the gas chromatography-mass spectrometry （GC-MS）. Results showed： （1）After steam-explosion pretreatment, holocellulose content was substantially reduced, while cellulose content was relatively increased and the lignin content had a little change; （2）After steam-explosion pretreatment, the fiber length was reduced; others were some debris and cracks on the fiber surface, and the crystallinity of the cellulose were increased obviously after steam-explosion; （3） Thirty-two compounds were identified in the steam-explosion liquid of bamboo extracted by ethyl acetate, and diethyl-pentanedioic acid ester was the main compound.