用胶原与改性纳米TiO2复合得到新型有机-无机复合材料, 研究复合物中胶原的含量随复合温度、pH的变化规律, 并考察TiO2晶型、Al2O3包膜改性及戊二醛交联改性对复合材料红外发射率的影响. 结果表明: 胶原与改性纳米TiO2复合的最佳温度为50℃、pH为8.0, 胶原含量最高可达9.45wt%, 两者间较强的复合协同作用明显降低了材料的红外发射率, 并提高了材料的热稳定性; 复合材料经戊二醛交联改性后可形成紧密有序的网络层状结构, 热稳定性进一步提高, 红外发射率最低可降至0.502.
New organic-inorganic nanocomposite materials of collagen and modified TiO2 were prepared. The change of content of collagen in the nanocomposites along with the alteration of temperature and pH value was studied, and the influence of such factors as types of TiO2 crystals, Al2O3 films of modification on TiO2 and cross-link with glutaraldehyde on the infrared emissivity of the composites was investigated. The results indicate that the optimal temperature and pH value for the reaction between collagen and modified nanosized TiO2are 50℃ and 8.0 respectively, under which the content of collagen increases up to 9.45wt%. The nanocomposites are endowed with much lower infrared emissivity and the thermal stability of the nanocomposite materials is enhanced greatly due to the strong interactions between collagen and modified nanosized TiO2. After being cross-linked by glutaraldehyde, disorderly distributional nanocomposites are turned to regular and ordered laminar netty ones, which improves the tensility and stability of the materials and lowers the infrared emissivity further to 0.502.
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