超低密度CHO泡沫结构与力学性能研究  

Study on the structure and mechanical properties of ultra-low density CHO foam

作　　者：李喆媛 张庆军 陈姝帆 李波 杨军校 LI Zheyuan;ZHANG Qingjun;CHEN Shufan;LI Bo;YANG Junxiao(School of Material Science and Engineering, Southwest University of Science and Technology,Mianyang, Sichuan, 621000, China;Research Centre of Laser Fusion,China Academy of Engineering Physics,Mianyang 621900,China)

机构地区：[1]西南科技大学材料科学与工程学院,四川绵阳621000 [2]激光聚变研究中心材料科学与技术部,四川绵阳621000

出　　处：《功能材料》2021年第9期9051-9054,共4页Journal of Functional Materials

基　　金：国家自然科学基金青年科学基金资助项目(61805221)。

摘　　要：基于溶胶-凝胶技术,通过不同的干燥方式,制备了3种10 mg/cm^(3)的CHO泡沫,并对泡沫的显微形貌、孔结构分布以及力学性能进行了测试分析。结果表明,通过超临界干燥技术制备得到的三乙酸纤维素(TAC)泡沫力学性能最佳,其弹性模量为3.50×10^(4) Pa,冷冻干燥制得的TAC泡沫弹性模量为3.38×10^(4) Pa,冷冻干燥获得的TMPTA(聚三羟甲基丙烷三丙烯酸酯)泡沫力学性能最差,其弹性模量仅为0.36×10^(4) Pa。超临界干燥TAC泡沫中的孔径较小(数纳米至十几纳米量级),孔径分布较为均匀。冷冻干燥的TAC泡沫孔径增大(几十纳米量级),孔径分布较宽。冷冻干燥的TMPTA泡沫孔径最大(百纳米量级孔洞大幅增加),孔径分布最宽。Based on the sol-gel technology,three kinds of 10mg/cm^(3) CHO foam were prepared through different drying methods,and the microscopic morphology,pore structure distribution and mechanical properties of the foam were tested and analyzed.The results show that the cellulose triacetate(TAC)foam prepared by supercritical drying technology has the best mechanical properties,its elastic modulus is 3.50×10^(4) Pa,and the elastic modulus of TAC foam prepared by freeze drying is 3.38×10^(4) Pa.The TMPTA(polytrimethylolpropane triacrylate)foam obtained by freeze-drying has the worst mechanical properties,and its elastic modulus is only 0.36×10^(4) Pa.The pore size in the supercritically dried TAC foam is small(a few nanometers to more than ten nanometers),and the pore size distribution is relatively uniform.The pore size of freeze-dried TAC foam is enlarged(on the order of tens of nanometers)and the pore size distribution is wider.The freeze-dried TMPTA foam has the largest pore size(a large increase in pores on the order of hundreds of nanometers)and the widest pore size distribution.

关 键 词：TMPTA TAC 干燥方式 均匀性 弹性模量 

分 类 号：TB34[一般工业技术—材料科学与工程]