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    • 7. 发明授权
    • Polymer nanocomposite foams
    • 聚合物纳米复合泡沫
    • US06759446B2
    • 2004-07-06
    • US10137037
    • 2002-05-02
    • L. James LeeKurt W. KoellingDavid L. TomaskoXiangmin HanChangchun Zeng
    • L. James LeeKurt W. KoellingDavid L. TomaskoXiangmin HanChangchun Zeng
    • C08J935
    • C08J9/122C04B26/02C08J9/0066C08J2203/08C08J2205/044C08J2325/06C08J2333/12C04B24/40C04B38/00
    • Nano-sized particles such as nano-clays can be mixed with polymers through either melt compounding or in-situ polymerization. By modifying the particle surface with various surfactants and controlling processing conditions, we are able to achieve either intercalated (partial dispersion) or exfoliated (full dispersion) nano-clay distribution in polymers with the clay content up to 35% by weight. When a blowing agent is injected into the nanocomposite in an extruder (a continuous mixer) or a batch mixer, polymeric foam can be produced. Supercritical carbon dioxide, an environmentally friendly, low-cost, non-flammable, chemically benign gas is used as the blowing agent. This process forms a microcellular foam with very high cell density (>109 cells/cc) and small cell size (
    • 纳米尺寸的颗粒例如纳米粘土可以通过熔融混合或原位聚合与聚合物混合。 通过用各种表面活性剂改性颗粒表面和控制加工条件,我们能够实现粘土含量高达35%(重量)的聚合物中的插层(部分分散)或剥离(全分散)纳米粘土分布。 当在挤出机(连续混合器)或间歇式混合器中将发泡剂注入纳米复合材料时,可以生产聚合物泡沫。 作为发泡剂,使用超临界二氧化碳,环境友好,低成本,不易燃,化学良性的气体。 该方法形成了具有非常高的细胞密度(> 10 9个细胞/ cc)的微孔泡沫,并且可以通过控制CO 2含量,熔体和模头温度以及压降速率来实现小单元尺寸(<5微米)。