Sulfonated polyethylene rearrangement of polyorganosiloxanes
    11.
    发明授权
    Sulfonated polyethylene rearrangement of polyorganosiloxanes 失效
    聚有机硅氧烷的磺化聚乙烯重排

    公开(公告)号:US5486590A

    公开(公告)日:1996-01-23

    申请号:US386040

    申请日:1995-02-09

    IPC分类号: C08G77/38 C08G77/08 C08G77/10

    CPC分类号: C08G77/10 C08G77/08

    摘要: A process for the rearrangement of polyorganosiloxanes using solid sulfonated polyethylene as a rearrangement catalyst. The process comprises contacting polyorganosiloxanes at a temperature within a range of about 20.degree. C. to 110.degree. C. with a rearrangement catalyst consisting essentially of a solid sulfonated polyethylene. In a preferred process, the solid sulfonated polyethylene is in the form of hollow fibers through which the polyorganosiloxanes are passed to effect rearrangement.

    摘要翻译: 使用固体磺化聚乙烯作为重排催化剂重排聚有机硅氧烷的方法。 该方法包括使聚有机硅氧烷在约20℃至110℃范围内的温度下与基本上由固体磺化聚乙烯组成的重排催化剂接触。 在优选的方法中,固体磺化聚乙烯是中空纤维的形式,通过该中空纤维通过聚有机硅氧烷以实现重排。

    Preparation of porous substrates having well defined morphology
    12.
    发明授权
    Preparation of porous substrates having well defined morphology 失效
    制备具有良好定义形态的多孔基材

    公开(公告)号:US4954381A

    公开(公告)日:1990-09-04

    申请号:US171497

    申请日:1988-03-21

    摘要: A membrane of defined pore structure and controlled pore diameter and a method of preparing the membrane which comprises dispersing in a water soluble polymer solution (A) an organic polymer solution (B), the water-soluble polymer solution (A) being a non-solvent for the polymer solution (B), to form micro-spherical droplets of the polymer solution (A) which are enveloped by a solid phase consisting of a coagulated or cross-linked polymer solution (B); evenly casting the dispersion on a flat surface; and evaporating the solvent for the polymer solution (B) to form a microporous membrane comprised of the polymer (B), the porosity, pore size, and void volume of the microporous membrane being a function of the polymer (A) concentration, the microsphere dimensions and the temperature and evaporation rate. The water-soluble polymer (A) is selected from polyethyleneimine, gelatin, polyvinyl-pyrrolidone, polyvinyl pyridinium halide, polyacrylic acid, polyhydroxyethylmethacrylate (HEMA), dextran, or polyvinyl acetate. The continuous phase polymer (B) is selected from a brominated polyphenylene oxide, polyphenylene oxide, polyacetic acid, polystyrene, polyglycol acrylate (PGA), polymethylmethacrylate, cellulose acetate, polyvinyl acetate, polycarbonate and polyvinylidene fluoride.

    摘要翻译: 一种限定孔结构和受控孔径的膜和一种制备膜的方法,其包括将水溶性聚合物溶液(A)分散在有机聚合物溶液(B)中,所述水溶性聚合物溶液(A) 用于聚合物溶液(B)的溶剂,以形成聚合物溶液(A)的微球形液滴,其被由凝结或交联的聚合物溶液(B)组成的固相包围; 均匀地将分散体浇铸在平坦的表面上; 并蒸发聚合物溶液(B)的溶剂以形成由聚合物(B)组成的微孔膜,微孔膜的孔隙率,孔径和空隙体积是聚合物(A)浓度的函数,微球体 尺寸和温度和蒸发速率。 水溶性聚合物(A)选自聚乙烯亚胺,明胶,聚乙烯吡咯烷酮,聚氯乙烯吡啶鎓卤化物,聚丙烯酸,聚羟基乙基甲基丙烯酸酯(HEMA),葡聚糖或聚乙酸乙烯酯。 连续相聚合物(B)选自溴化聚苯醚,聚苯醚,聚乙酸,聚苯乙烯,聚乙二醇丙烯酸酯(PGA),聚甲基丙烯酸甲酯,乙酸纤维素,聚乙酸乙烯酯,聚碳酸酯和聚偏二氟乙烯。

    Method of making membranes for gas separation and the composite membranes
    17.
    发明授权
    Method of making membranes for gas separation and the composite membranes 失效
    制造气体分离膜的方法和复合膜

    公开(公告)号:US4602922A

    公开(公告)日:1986-07-29

    申请号:US709005

    申请日:1985-03-07

    IPC分类号: B01D69/12 B01D71/70 B01D53/22

    摘要: Composite membranes suitable for separating gas mixtures are made by in situ crosslinking of aminoorganofunctional polysiloxane, 1 to 9 mol percent aminosiloxane units, with diisocyanate on the surface of a highly porous polymer substrate, such as polysulfone. Using the crosslinked polysiloxane as a gutter layer, a gas separating entity can be coated on the gutter layer to make a double layer composite membrane which has a higher separation factor than the crosslinked polysiloxane and can be used effectively for flat sheet membranes, as well as, hollow fiber membranes.

    摘要翻译: 适用于分离气体混合物的复合膜通过在高度多孔的聚合物基材如聚砜的表面上原位交联氨基有机官能聚硅氧烷,1至9摩尔%的氨基硅氧烷单元与二异氰酸酯来制备。 使用交联聚硅氧烷作为沟槽层,气体分离实体可以涂覆在沟槽层上,以制备具有比交联的聚硅氧烷更高的分离因子的双层复合膜,并且可以有效地用于平板膜,以及 ,中空纤维膜。