在光固化水性聚氨酯乳液合成中原位引入纳米二氧化硅水溶胶制备复合乳液及复合膜,研究了二氧化硅粒径、表面化学特性对复合膜微观结构和性能的影响。透射电镜（TEM）和原子力显微镜（AFM）分析表明,表面有机改性二氧化硅很好分散在聚氨酯基体中,而酸性、碱性硅溶胶在聚氨酯基体中发生不同程度团聚和粘连,且不同粒径、表面化学特性的二氧化硅对纳米复合涂层表面形貌有较大影响;动态力学性能（DMA）分析表明,不同纳米二氧化硅引入对聚氨酯软硬段相分离产生较大影响,可不同程度提高复合膜的储能模量。
UV-curable waterborne polyurethane（WPU）/silica nanocomposites were prepared using aqueous silica sol by in situ method.Transmission electron microscope（TEM） and atomic force microscope（AFM） examinations of nanostructured films indicate that the organic modified nanosilica is well dispersed in the matrix,while acid and base silica tend to aggregated and interconnected.AFM analysis reveals that the microphase separation between polyurethane and silica is significantly affected by the types of silica incorporated.Dynamic mechanical analysis（DMA） shows that the nanocomposite films with WV33,R900,methacryloxy（propyl） trimethoxysilane（MEMO）-silica nanoparticles show a single tanδ peak,which implies that soft and hard segments of polyurethane are well phase mixed.The nanostructured films display enhanced storage modulus compared to the control polyurethane films.
参考文献
| [1] | Nanda AK;Wicks DA;Madbouly SA;Otaigbe JU .Nanostructured polyurethane/POSS hybrid aqueous dispersions prepared by homogeneous solution polymerization - art. no. MA060809H[J].Macromolecules,2006(20):7037-7043. |
| [2] | Zhang L;Zeng ZH;Yang JW;Chen YL .Characterization and properties of UV-curable polyurethane-acrylate/silica hybrid materials prepared by the sol-gel process[J].Polymer international,2004(10):1431-1435. |
| [3] | OH IN-SEOK;PARK NO-HYUNG .Mechanical and Surface Hardness Properties of Ultraviolet-Cured Polyurethane Acrylate Anionomer/Silica Composite Film[J].Journal of Applied Polymer Science,2000(7):968-975. |
| [4] | Sheng-Wen Zhang;Shu-Xue Zhou;Yu-Ming Weng;Li-Min Wu .Synthesis of SiO_2/Polystyrene Nanocomposite Particles via Miniemulsion Polymerization[J].Langmuir: The ACS Journal of Surfaces and Colloids,2005(6):2124-2128. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%