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    • 7. 发明授权
    • Block copolymer and nanofiller composites
    • 嵌段共聚物和纳米填料复合材料
    • US08974915B2
    • 2015-03-10
    • US11080668
    • 2005-03-16
    • Junrong ZhengRahmi OzisikRichard W. Siegel
    • Junrong ZhengRahmi OzisikRichard W. Siegel
    • B32B15/08B82Y30/00C08K3/22
    • B82Y30/00C08K3/22C08K2003/2296C08K2201/011Y10T428/12569
    • PU/ZnO nanocomposites are provided wherein the addition of less than 1 vol % 33 nm ZnO nanoparticles into a PU matrix effect a decrease in the Young's Modulus and storage modulus of the polymer, while simultaneously effecting an increase glass transition temperature of the polymer. Detailed experiments are described (e.g., FTIR, DMTA, FESEM and AFM) that suggest that the reaction between hydroxyl groups of the ZnO nanoparticles and isocyanate groups of the polyurethane prepolymer disrupts the self-assembly of the phase separation in PU. Phase separation is responsible for the good mechanical properties of PU. Further, detailed experiments suggest that the increase of the glass transition temperature results from the crosslinking effect of the ZnO nanoparticles.
    • 提供了PU / ZnO纳米复合材料,其中将少于1体积%的33纳米ZnO纳米颗粒加入到PU基质中可以降低聚合物的杨氏模量和储能模量,同时会增加聚合物的玻璃化转变温度。 描述了详细的实验(例如,FTIR,DMTA,FESEM和AFM),其表明ZnO纳米颗粒的羟基与聚氨酯预聚物的异氰酸酯基团之间的反应破坏了PU中相分离的自组装。 相分离负责PU的良好机械性能。 此外,详细的实验表明,玻璃化转变温度的升高是由ZnO纳米颗粒的交联效应引起的。