摘要
以异佛尔酮二异氰酸酯、聚乙二醇、2,2-双羟甲基丙酸、甲基丙烯酸-2-羟基乙酯(HEMA)为主要原料,通过丙酮法合成光固化水性聚氨酯丙烯酸酯预聚体,三乙胺中和后原位引入纳米二氧化硅水溶胶制备光固化水性聚氨酯/二氧化硅纳米复合乳液(WPU/SiO2)。研究了纳米二氧化硅对复合乳液粒径、黏度以及复合膜微观结构和力学性能的影响。经X射线衍射(XRD)、扫描电镜(SEM)和原子力显微镜(AFM)对复合膜微观结构分析表明,纳米二氧化硅与聚氨酯之间存在很好的相互作用,纳米二氧化硅均匀分散在聚氨酯基体中。动态力学分析表明纳米二氧化硅可提高复合膜的储能模量。
UV-curable waterborne polyurethane（WPU）/silica nanocomposites were prepared mainly from isophorone diisocyanate （IPDI）,polyethyene glycol （PEG400）,2,2-bis（hydroxymethyl） propionic acid （DMPA）,hydroxyethyl methacrylate （HEMA）,aqueous silica sol by in situ method.X-ray diffraction （XRD） and scanning electron microscope （SEM） examinations of nanostructured films indicate that the nanosilica has strong interaction with the UWPU matrix and is well dispersed in the matrix.Atomic force microscopy reveals that the microphase separation between polyurethane and silica is significantly affected by the amount of silica incorporated.Dynamic mechanical analysis（DMA） shows that the nanocomposite films with 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,tensile strength without sacrificing high elongation at break.The resulting transparent hybrid films are promising for a number of applications,e.g.for high performance water-based UV-curable coatings.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
2010年第11期9-12,共4页
Polymer Materials Science & Engineering
基金
国家自然科学基金资助项目(51003041)
中央高校基本科研业务费专项资金资助(JUSRP11004)
