AESO浸渍改性速生木材的性能及机理
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昆明理工大学化学工程学院

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国家自然科学基金地区基金资助项目(51167008);校企合作科技基金资助项目(kkk0201705038)


Performance and Mechanism of AESO Impregnation Modified Fast-growing Wood
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    摘要:

    目前生物基改性剂的局限在于只能改善速生木材某些单一方面的性能。为提高速生材的综合使用性能,以杉木、樟子松、杨木为研究对象,采用经活性单体稀释的环氧大豆油丙烯酸酯(AESO)对其进行化学浸渍改性,比对不同工艺条件下改性木材综合性能的提升效果。通过傅里叶红外光谱仪(FTIR)对合成的AESO进行结构表征,利用 X射线光电子能谱仪(XPS)和扫描电子显微镜(SEM)分析AESO浸渍改性木材的微观机理。结果表明,以苯乙烯(St)为稀释剂,按AESO:St=3:1配制的混合体系浸渍速生材并在70℃下固化6h,三种木材的综合性能均获得明显提升。改性杉木的性能提升最为显著,浸渍率为166.1%,固化增重率为157.0%,7d抗吸水率达到了86.1%,顺纹抗压强度增加了87.2%。XPS分析结果表明,AESO浸渍体系成功渗透到木材内部,渗透方式以横向渗透为主。SEM观察到的微观形貌变化说明,改性后木材的微观结构未遭到破坏,浸渍体系填充、粘附到木材结构组织的细胞壁上并交联固化,细胞壁上的纹孔口被闭塞,极大地提高了速生材的抗吸水性和机械强度。

    Abstract:

    At present, the limitation of bio-based modifiers is that they can only improve some single aspects of the properties for fast-growing wood. To improve the comprehensive applied performance of fast-growing wood, Chinese fir, pinus sylvestris, and poplar were modified with acrylated epoxidized soybean oil (AESO) diluted by active monomer and compared the comprehensive performance of modified wood under different processing conditions. The synthesized AESO was characterized by FTIR. Moreover, the surface composition and microstructure of AESO impregnated modified wood were investigated by X-ray photoelectron spectroscopy (XPS) and SEM and the modification mechanism was further analyzed. The results show that the comprehensive properties of the three kinds of wood were improved by impregnating the fast-growing wood and curing it at 70 °C for 6h using a mixed system with AESO: St=3:1, styrene (St) as the diluent. The properties of modified Chinese fir were improved most significantly, the impregnation yield was 166.1%, the curing weight gain percent was 157.0%, the anti-water absorption rate of 7d was 86.1%, and the compressive strength was increased by 87.2%. XPS analysis shows that the AESO impregnation system successfully penetrated into the Interior of the wood, mainly through transverse penetration. The changes of Micromorphology observed by SEM indicate that the microscopic structure of wood after the modification has not been destroyed, and the impregnation system filled and adhered to the cell walls of various structural tissues of wood and cured. pits on the cell wall were blocked, which greatly improved the anti-water absorption resistance and mechanical strength of fast-growing wood.

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  • 收稿日期:2022-03-08
  • 最后修改日期:2022-06-13
  • 录用日期:2022-06-15
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