摘要
【目的】植物纤维多孔材料的制备通常采用热分解型化学发泡剂,研究碳酸氢铵(NH4HCO_(3))、碳酸氢钠(NaHCO_(3))、偶氮二甲酰胺/碳酸氢钠(AC/NaHCO_(3))以及AC/NaHCO_(3)不同复配比例对植物纤维多孔材料的泡孔结构及缓冲性能的影响。【方法】以漂白针叶木浆为主要原料,添加NH4HCO_(3)、NaHCO_(3)、AC/NaHCO_(3)3种不同的发泡剂,以及AC/NaHCO_(3)不同复配比例条件下,采用微波成型工艺制备植物纤维多孔材料。利用Image Pro Plus 6.0软件对植物纤维多孔材料泡孔的显微图像进行处理分析,得到孔隙率、孔径大小及泡孔分布等参数;通过静态压缩测试分析材料力学性能和单位体积变形能。【结果】对比3种发泡剂试样,AC/NaHCO_(3)复配发泡剂制备的植物纤维多孔材料具有较高的孔隙率且泡孔分布较均匀,得到最小缓冲系数为4.93,具有良好的缓冲特性;对比AC/NaHCO_(3)3种不同配比的试样,得出比例为2∶1及3∶1时发泡效果较好,泡孔分布较均匀,其中AC/NaHCO_(3)比例为2∶1时材料得到的最小缓冲系数最小,缓冲性能良好。【结论】AC/NaHCO_(3)复配发泡剂能在更大温度范围内持续产生气体,且AC/NaHCO_(3)比例为2∶1时,发泡剂发气均匀,制备的植物纤维多孔材料泡孔分布均匀性更好,材料缓冲性能优良,此结果可为研究发泡剂对植物纤维多孔材料的泡孔结构及缓冲性能的影响提供参考。
【Objective】Plant fiber porous materials are usually prepared by using thermal decomposition chemical foaming agents.The effects of ammonium bicarbonate(NH4HCO_(3)),sodium bicarbonate(NaHCO_(3)),azodicarbonamide/sodium bicarbonate(AC/NaHCO_(3))and different proportions of AC/NaHCO_(3) on the bubble structure and buffering properties of plant fiber porous materials were investigated in this article.【Method】The bleaching coniferous wood pulp was used as the main raw material.Three different foaming agents of NH4HCO_(3),NaHCO_(3) and AC/NaHCO_(3) with different ratios were added,and the plant fiber porous material was prepared by the microwave molding process.The Image Pro Plus 6.0 software was used to process and analyze the microscopic images of the plant fiber porous materials,and the parameters of porosity,pore size and pore distribution were obtained.The mechanical properties and deformation energy per unit volume were analyzed by the static compression test.【Result】Compared with the three kinds of foaming samples,the plant fiber porous material prepared by the AC/NaHCO_(3) compound had a higher porosity and more uniform distribution of bubble pores,and the minimum buffer coefficient was 4.93,showing good buffering characteristics.The comparison of the three samples treated with different ratios of AC/NaHCO_(3) showed that the foaming effect was better when the ratio was 2∶1 and 3∶1,and the distribution of bubble holes was more uniform.The minimum buffer coefficient of the material obtained was the smallest when the ratio of AC/NaHCO_(3) was 2∶1,and the buffer performance was good.【Conclusion】The study found that the AC/NaHCO_(3) compound can continuously produce gas in a wide temperature range,and when the ratio of AC/NaHCO_(3) is 2∶1,the foaming agent can produce uniform gas,and the prepared plant fiber porous material has better distribution uniformity of bubble holes,and the material has excellent buffering performance.This work has provided references for studying the effect of foami
作者
王哲
杨洪秀
李琛
高珊
WANG Zhe;YANG Hongxiu;LI Chen;GAO Shan(College of Engineering and Technology,Northeast Forestry University,Harbin 150040,Heilongjiang,China)
出处
《中南林业科技大学学报》
CAS
CSCD
北大核心
2023年第5期158-168,共11页
Journal of Central South University of Forestry & Technology
基金
国家自然科学基金面上项目(32071685)
中央高校基本科研业务费专项资金项目(2572018BL07)。
关键词
植物纤维
发泡剂
泡孔结构
缓冲性能
plant fiber
foaming agent
bubble structure
buffering performance
