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    • 5. 发明授权
    • Synthesis of functional polymers and block copolymers on silicon oxide surfaces by nitroxide-mediated living free radical polymerization in vapor phase
    • 在氧化硅表面通过硝基氧介导的自由基聚合在气相中合成官能聚合物和嵌段共聚物
    • US06861103B2
    • 2005-03-01
    • US10360443
    • 2003-02-07
    • Ying Chih ChangJun LiXiaoru Chen
    • Ying Chih ChangJun LiXiaoru Chen
    • B05D7/24C08F2/46C08F4/00C08F283/12C08F289/00C08F293/00C08L51/08H01L21/312
    • B05D1/60C08F4/00C08F283/12C08F289/00C08F293/005C08F2438/02C08L51/08C08L51/085H01L21/02118H01L21/02271H01L21/312
    • Nitroxide mediated free radical polymerization of vaporized vinyl monomers, including acrylic acid (AAc), styrene (St), N-2-(hydroxypropyl)methacrylamide (HPMA) and N-isopropyl acrylamide (NIPAAm), on silicon wafers is demonstrated. FTIR, ellipsometry and contact angle goniometry were used to characterize the chemical structures, thickness and hydrophilicity of the films. The growth of film is linearly proportional to its reaction time, leading to the easy and exact control of polymer film thickness from nanometers to submicrons. The capability of polymerizing various monomers allows us to fabricate various functional polymer brushes. The reversible thermo-responsiveness of a 200 nm thick grafted poly(NIPAAm) film in aqueous solution is demonstrated with over 50% change in thickness at its lower critical solution temperature. A tri-block copolymer of poly(AAc)-b-polySt-b-poly(HPMA) is successfully synthesized, proving the renewability of TEMPO-mediated polymerization at vapor phase. Surface polymer composition and morphology is thus controlled at nanoscale by utilizing vapor phase surface-initiated controlled polymerization.
    • 证明了在硅晶片上的气化乙烯基单体,包括丙烯酸(AAc),苯乙烯(St),N-2-(羟丙基)甲基丙烯酰胺(HPMA)和N-异丙基丙烯酰胺(NIPAAm))的自由基聚合。 使用FTIR,椭偏仪和接触角测角法来表征膜的化学结构,厚度和亲水性。 膜的生长与其反应时间成线性比例,导致聚合物膜厚度从纳米到亚微米的容易和准确的控制。 聚合各种单体的能力使我们能够制造各种功能性聚合物刷。 200nm厚接枝聚(NIPAAm)膜在水溶液中的可逆热响应性被证明在其较低的临界溶液温度下具有超过50%的厚度变化。 成功地合成了聚(AAc)-b-polySt-b-聚(HPMA)的三嵌段共聚物,证明了TEMPO介导的气相聚合的可再生性。 因此,通过使用气相表面引发的受控聚合,表面聚合物组成和形态由纳米尺度控制。