摘要
采用溶胶凝胶法,将圆竹浸渍于磷酸铝与铜硼复配防霉剂中,分别进行不同浸渍工艺(浸没式浸渍、开放式浸渍和高温高压)和不同时间处理后,针对圆竹的力学性能进行研究,探讨在提高防霉特性这一重要耐候性指标变化的同时,其力学性能的变化规律,并结合微观形貌及化学结构等分析其力学性能变化机理。结果表明:常温常压下,圆竹力学性能随浸渍时间延长先增后减,12 d时达到最优,归因于铝离子水解产物及与硅离子原位合成硅铝无机物,在圆竹表面和内部结构中形成溶胶-凝胶,其与圆竹纤维素之间既存在氢键,还存在Si-O-C、Al-O-C键结合,提高了圆竹的力学性能;高温高压下,竹纤维逐渐降解,力学性能随浸渍时间延长而降低。浸渍12 d时,开放式浸渍处理的圆竹力学性能最优,因其生成更多的铝离子水解产物及硅铝无机物,并与竹纤维结合。此外,开放式浸渍12 d的圆竹防霉效果优于浸没式及高温高压处理,良好的防霉性能可维持圆竹稳定的力学性能,为圆竹在家具及建筑领域的应用提供了理论支持。
Using the sol-gel method,the mechanical properties of round bamboo treated with different impregnation processes(submersion impregnation,open impregnation,and high-temperature high-pressure impregnation)and durations were studied after being impregnated in an aluminum phosphate and copper-boron composite mold inhibitor.The aim was to explore the changes in mechanical properties while improving the mold resistance,an important weather resistance index,and to analyze the mechanisms of these changes by combining micro-morphology,chemical structure analysis and so on.The results showed that under room temperature and atmospheric pressure,the mechanical properties of round bamboo initially increased and then decreased with the prolonged impregnation time,reaching the optimum at 12 days.This was attributed to the hydrolysis products of aluminum ions and the in-situ synthesis of silicon aluminum with silicon ions,forming a sol-gel on the surface and within the bamboo structure.The mechanical properties were enhanced due to the formation of not only hydrogen bonds but also Si-O-C and Al-O-C chemical bonds between the sol-gel and bamboo cellulose.Under high-temperature and high-pressure conditions,bamboo fibers gradually degraded,leading to a decrease in mechanical properties with the prolonged impregnation time.At 12 days of impregnation,round bamboo treated with open impregnation exhibited the best mechanical properties,as more hydrolysis products of aluminum ions and silicoaluminates were generated and combined with bamboo fibers.Additionally,round bamboo treated with open impregnation for 12 days showed better mold resistance than those treated with submersion or high-temperature high-pressure methods.The excellent mold resistance contributed to the stable mechanical properties of round bamboo,providing theoretical support for its application in furniture and construction fields.
作者
张诚紫
谢拥群
任远航
ZHANG Chengzi;XIE Yongqun;REN Yuanhang(Jinshan College,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Material Engineering College,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China)
出处
《井冈山大学学报(自然科学版)》
2025年第4期97-106,共10页
Journal of Jinggangshan University (Natural Science Edition)
基金
福建省中青年教师教育科研项目(JAT210667)
江西省重大科技研发专项“揭榜挂帅”项目(KJA21H15A)。
关键词
溶胶-凝胶
防霉剂
圆竹
力学性能
Sol-Gel
mold inhibitor
round bamboo
mechanical properties
作者简介
通信作者:谢拥群(1960-),男,福建南平人,教授,博士,博士生导师,主要从事植物纤维工程材料领域研究(Email:fjxieyq@163.com)。
