热处理工艺对竹材性能的影响  

Phyllostachys edulis with high temperature heat treatments

作　　者：汤颖[1] 李君彪 沈钰程[1] 金勇男[1] 王云芳[1] 李延军[1] 

机构地区：[1]浙江农林大学工程学院,浙江临安311300

出　　处：《浙江农林大学学报》2014年第2期167-171,共5页Journal of Zhejiang A&F University

基　　金：浙江省自然科学基金资助项目(LZ13C160003);浙江省科学技术计划项目(2012R10023-05);国家级大学生创新创业计划项目(201210341013);浙江省新苗人才计划项目(2012R412013);浙江省创新训练项目(201204034)

摘　　要：采用热处理温度为160,180,200℃,热处理时间为2,4,6 h的高温热处理工艺对毛竹Phyllostachys edulis竹材进行改性处理,分析不同热处理工艺对竹材化学成分和力学性能的影响,将分别在160,180,200℃下处理4h后的竹材进行傅立叶变换红外光谱图表征。结果表明:热处理温度越高和时间越长,竹材中木质素质量分数也越高,综纤维素、α-纤维素质量分数呈现下降的趋势,竹材的纵向抗弯强度呈减小趋势,并且抗弯弹性模量呈减小趋势。200℃,6 h热处理竹材与未处理竹材相比,木质素质量分数上升了115.0 g·kg-1,综纤维素质量分数下降了93.1 g·kg-1,α-纤维素的质量分数下降了239.4 g·kg-1,毛竹竹材的抗弯强度较未处理材减小了84.5 MPa,抗弯弹性模量较未处理材减小了1.86 GPa。红外谱图中竹材表面羟基数目随热处理温度的上升和热处理时间的延长不断减少。To determine changes in chemical components as well as physical and mechanical properties of Phyllostachys edulis, heat treatments of 160, 180, and 200 ℃ for 2, 4, and 6 h were applied to bamboo and compared with untreated bamboo. The treatments were analyzed with a spectrogram from a Fourier trans- form infrared spectroscopy . Results showed that as the heat treatment temperatures and times increased, the Klason-lignin content of Ph. edulis bamboo increased; whereas holo-cellulose content, α-cellulose, modulus of rupture （MOR）, and modulus of elasticity （MOE） decreased. The 200 ℃and 6 h heat-treatment compared to untreated bamboo increased the Klason-lignin content 115.0 g·kg-1 but decreased the holo-cellulose content 93.1 g·kg-1 and α-cellulose 239.4 g·kg-1. Bending strength decreased 84.5 MPa and the MOE decreased 1.86 GPa. The spectrogram also illustrated that the number of hydroxyls on the surface of the modified bamboo de- creased.

关 键 词：木材学 毛竹竹材 高温热处理 化学成分 红外光谱 力学性能 

分 类 号：S781.2[农业科学—木材科学与技术]