中文摘要：

采用蒸馏水、2％NaOH和5％KOH从6月龄毛竹竹竿中分级抽提得到水溶性半纤维素Hw和碱溶性半纤维素H1～H4。通过热重分析法在升温速率10℃／min条件下分析了这5种半纤维素的热解特性，并对快速热解区建立了一级反应动力学模型。毛竹半纤维素热解主要发生在180～400％，失重33．91％～42．54％。在终止温度700％时残渣率均较高，达到34．52％～51．31％。毛竹半纤维素组分活化能均较小，为26．068～51．938kJ／mol。碱溶性组分的活化能大于水溶性组分的活化能，残留木素越多，半纤维素的活化能和终止温度时的残渣率就越高。

英文摘要：

Water-soluble hemicclluloses Hw and four alkali-soluble hemicellulosic fractions H1 ~ H4 were sequentially extracted from six- month-old bamboo stem by distilled water, 2% NaOH and 5% KOH. The thermal pyrolysis behavior of the five hemicellulosic fractions was characterized by using thermal gravimetric analysis （TGA） at the heating rate of 10℃/min, and the first-order reaction models were estab- lished in the fast pyrolysis temperature ranges. The fast decompositions of the five fractions happened in between 180 -400℃ with weight los- ses 33.91% -42.54%. The residue percentages were 34.52% -51.31% at the final temperature of 700℃. The activity energies of all the hemicelluloses fractions were quite low with the values of 26. 068 ~ 51. 938 kJ/mol. The activity energies of alkali-soluble fractions were higher than that of water-soluble fraction. The hemicellulosic fractions containing higher lignin residue exhibited higher activity energy and residue rate at the final temperature of pyrolysis.