化工进展 ›› 2017, Vol. 36 ›› Issue (12): 4569-4574.DOI: 10.16085/j.issn.1000-6613.2017-1538

• 材料科学与技术 • 上一篇    下一篇

纳米SiO2-木质素基酚醛泡沫的热稳定性及韧性表征

郭亚军, 胡立红, 张娜, 周永红   

  1. 中国林业科学研究院林产化学工业研究所, 国家林业局林产化学工程重点开放性实验室, 江苏 南京 210042
  • 收稿日期:2017-07-24 修回日期:2017-08-28 出版日期:2017-12-05 发布日期:2017-12-05
  • 通讯作者: 胡立红,博士,副研究员,主要从事生物质高分子材料的应用研究。
  • 作者简介:郭亚军(1992-),男,硕士研究生。E-mail:ggguoyajun@163.com。
  • 基金资助:
    国家十三五重点研发计划(2017YFD0601000)、国家自然科学基金面上项目(31470613)及林化所创新工程项目(LHSXKQ11)。

Characterization of thermal stability and toughness of nanoSiO2-lignin based phenolic foam

GUO Yajun, HU Lihong, ZHANG Na, ZHOU Yonghong   

  1. Institute of Chemical Industry of Forest Products Chinese Academy of Forestry(CAF), Key and Open Laboratory of Forest Chemical Engineering, Nanjing 210042, Jiangsu, China
  • Received:2017-07-24 Revised:2017-08-28 Online:2017-12-05 Published:2017-12-05

摘要: 采用溶胶-凝胶法制备的纳米SiO2和氧化降解的木质素磺酸钙共同改性酚醛泡沫。并采用热重分析仪、电子万能试验机、扫描电镜等方法对泡沫材料进行了表征。测试结果表明,改性泡沫的热稳定性和韧性得到了提高,其中质量分数为0.5%的纳米SiO2-木质素酚醛泡沫(LPF-0.5)性能最佳。热重分析泡沫LPF-0.5的最大速率降解温度为330℃,残炭率为54%,比纯泡沫(PPF)的145℃和49%,分别提高185℃和10%。力学性能测试表明泡沫LPF-0.5的压缩强度(0.33MPa)、弯曲强度(0.53MPa)和弯曲模量(16.01MPa)比PPF(0.27MPa、0.31MPa、10.54MPa)分别提高了23%、71%、52%。易碎性能表征泡沫LPF-0.5的粉化率降低了34%,韧性明显提高。同时扫描电镜显示泡沫LPF-0.5具有最优的泡体规整度和泡孔均匀度。

关键词: 纳米二氧化碳, 木质素, 酚醛泡沫, 热稳定性, 韧性, 粉化率

Abstract: A series of phenolic foams were prepared by nanoSiO2 rooting in sol-gel process and calcium lignosulfonate after oxidative degradation. The properties of foam materials were characterized by thermogravimetric analyzer,electronic universal testing machine,and scanning electron microscope. Results showed that the improvements of thermal stability and toughness of modified foam varied,among which LPF-0.5,with 0.5% mass fraction of nanoSiO2-lignin phenolic foam,had the optimum performance. TG analysis results indicated the maximum rate of degradation of LPF-0.5 was 330℃ and the char content was 53.7%,which was 185℃ and 9% higher than that of pure foam (PPF)at 145℃ and 49.3%,respectively. Mechanical properties test showed the compression strength,bending strength and bending modulus of foam LPF-0.5 were 0.33MPa,0.53MPa and 16.01MPa,respectively,while those of PPF were 0.27MPa,0.31MPa and 10.54MPa,which was increased by 23%,71% and 52%,respectively. Compared to the pure foam,the pulverization rate of LPF-0.5 decreased by 34%. Scanning electron microscopy indicated that the foam LPF-0.5 had the best bubble regularity and bubble uniformity.

Key words: nanoSiO2, lignin, phenolic foam, thermal stability, toughness, pulverization ratio

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