Zhang Ying, Zhang Xin, Yu Youming, Che Wenbo, Zhang Xiaochun, Hou Junfeng
School of Engineering, Zhejiang A & F University Hangzhou Zhejiang 311300 P. R. China
Zhejiang Provincial Collaborative Innovation Center for Bamboo Resources and High-efficiency Utilization Hangzhou 311300 P. R.China.
RSC Adv. 2020 Dec 8;10(71):43438-43446. doi: 10.1039/d0ra08713k. eCollection 2020 Nov 27.
The main objective of this work is to analyse the influence of heat treatment with polydimethylsiloxane on integrated performance of bamboo timber. Bamboo timber was heat treated using polydimethylsiloxane as a medium at 120, 150, 180 and 210 °C for 3 h in this study. Results revealed that the equilibrium moisture content (EMC) and linear swelling ratio of heat-treated bamboo specimens was remarkable decreased with increasing heat treatment temperature. The surface contact angle of water on the bamboo specimens was observed to increase with the increasing heat treatment temperature, indicating the reduction of wettability with water. Additionally, the modulus of rupture (MOR) and modulus of elasticity (MOE) was decreased with the increasing heat treatment temperature and lower than that of untreated specimens. Cellulose crystallinity of bamboo specimens was slightly decreased with the increase of heat treatment temperature. TG-DTG results illustrated a reduction in relative content of hemicellulose, and increase in relative content of lignin and cellulose of bamboo specimens with the increase of heat treatment temperature. Presence of the stretching vibration Si-C in Si-CH indicated the bonding of siloxane to bamboo timber by forming covalent bonds. The colour of the heat-treated bamboo timber was even deepened after heat treatment, endowing the bamboo timber with better surface decoration performance.
本研究的主要目的是分析聚二甲基硅氧烷热处理对竹材综合性能的影响。本研究中，以聚二甲基硅氧烷为介质，在120、150、180和210℃下对竹材进行3小时的热处理。结果表明，随着热处理温度的升高，热处理竹材试件的平衡含水率（EMC）和线性膨胀率显著降低。观察到竹材试件表面水接触角随热处理温度的升高而增大，表明其与水的润湿性降低。此外，随着热处理温度的升高，竹材的抗弯强度（MOR）和弹性模量（MOE）降低，且低于未处理试件。竹材试件的纤维素结晶度随热处理温度的升高略有降低。TG-DTG结果表明，随着热处理温度的升高，竹材半纤维素相对含量降低，木质素和纤维素相对含量增加。Si-CH中Si-C的拉伸振动表明硅氧烷通过形成共价键与竹材结合。热处理后，竹材颜色加深，赋予竹材更好的表面装饰性能。
