烷基化(乙酰化和氰乙基化)竹粉的热行为研究

Study on the thermal behaviour of bamboo powder undergoing acetylation /cyanoethylation

天然植物体的热塑化改性是生物质技术应用的瓶颈,在受热过程中,热塑化植物体分子结构和链段的变化对其应用和性能至关重要。文章利用热裂解—气质联用分析和示差扫描量热分析(DSC),研究制备烷基化竹粉在受热过程中的变化情况。结果表明,烷基化竹粉的热裂解产物中含有反应上去的烷基基团,烷基化反应破坏了竹粉中纤维素的结晶结构,纤维素和半纤维素热裂解产物糠醛的含量从21.57%增加到35.07%,这样较为松散的分子结构有利于竹粉的热成型加工;经过烷基化反应的竹粉的分子链或链段的运动能力增强,从而使竹粉具有热塑性的可能性。

Plastifying modification of natural plants is a bottleneck in the applications of biomass technology. The molecular structures and the changes of chain section during thermal processing are essential to the plastified plants＇ application and property. The pyrolysis coupled with GC-MS and the differential scanning calorimeter （DSC） was adopted to study the changes of alkylated bamboo powder during thermal processing. The results show that the pyrolytic products of alkylated bamboo powder contain alkyl groups. With the crystallization destruction of bamboo cellulose by alkylation, the content of fuffural produced from the pryrolysis of cellulose and hemicellulose increases from 21.57 % to 35.07 %. Moreover, the molecular chain and the molecular chain section are activated by alkylation, making it possible to plastify bamboo powder.