纳米SiO_2含量对水性聚氨酯复合材料性能的影响  

Effect of Nano-silica Content on Properties of Waterborne Polyurethane Composites

作　　者：陈晶晶[1] 朱传方[1] 秦正妮[1] 白一穷[1] 

机构地区：[1]华中师范大学化学学院,武汉430079

出　　处：《应用化学》2008年第9期1047-1051,共5页Chinese Journal of Applied Chemistry

基　　金：湖北省科技厅资助项目(2007AA101C35)

摘　　要：将纳米SiO2改性并与异佛尔酮二异氰酸酯、聚酯二元醇、二羟甲基丙酸在月桂酸丁基锡催化下经原位聚合制备出水性聚氨酯纳米SiO2复合材料。用DSC、TG、TEM及动态力学分析等测试技术研究了纳米SiO2的成分对水性聚氨酯的形态、性能的影响。结果表明,质量分数在3.0%以下时,SiO2均匀地分散在水性聚氨酯中,高于3.0%时有少量聚集;SiO2的加入使水性聚氨酯复合材料软段与硬段微相分离明显,玻璃化转变温度的范围加宽,热分解温度比未加入的高50℃以上。此外,加入质量分数为0.5%SiO2时,断裂伸长率由550%降至430%,吸水率由16.8%降至4.5%,拉伸强度由3.4 MPa增至5.95 MPa。当加入质量分数为2.5%SiO2时,断裂伸长率降至210%,吸水率降至2.3%,拉伸强度增至7.58 MPa。We have prepared waterborne polyurethane （WPU） nano-SiO2 composites by in situ polymerization, during which modified silica sol was first mixed with the N-methyl-pyrolidone （NMP）, and then polymerization was carried out with the addition of isophorone diiocyanate （IPDI）, polycaprolactone （PCL） dimethylol-propionic acid（DMPA） and dibutyltin dilaurate. Effects of nano-silica content on the thermal and mechanical properties of WPU/nano-silica composites were investigated by thermogravimetric analysis（ TGA）, differential scanning calorimetry （ DSC ） , transmittance electron microscopy （TEM） and dynamic mechanical analysis（DMA）. The experiment results show that the nano-silica particles were well dispersed in the WBPU solution when the silica content was lower than 3.0%, a wider Ts gap and higher microphase separation degree between soft and hard segment were observed for WPUNS, and the thermal degradation temperature of the composite was higher than that of a pure WPU at temperature over 50 ℃. Besides, as the nano-silica content was increased from 0 to 0. 5% , the elongation at break and water swell were decreased from 550% to 430% and 16. 8% to 4. 5% , respectively, while, the tensile strength was increased from 3.4 MPa to 5.95 MPa. As the nano-silica content was increased to 2, 5%, the elongation at break and water swell decreased to 210% and 2.3%, and the tensile strength increased to 7.58 MPa.

关 键 词：纳米SIO2 水性聚氨酯 原位聚合 形态 性能 

分 类 号：O631.2[理学—高分子化学] TQ630.6[理学—化学]