Semipermeable membrane made from a homogeneously miscible polymer blend
    3.
    发明授权
    Semipermeable membrane made from a homogeneously miscible polymer blend 失效
    由均质杂质聚合物混合制成的可切割膜

    公开(公告)号:US5152894A

    公开(公告)日:1992-10-06

    申请号:US733377

    申请日:1991-07-22

    CPC分类号: B01D67/0083 B01D71/56

    摘要: A semipermeable membrane is described which comprises a homogeneously miscible polymer blend of an aromatic polyamide and polyvinylpyrrolidone. The aromatic polyamide is in particular formed of recurrent units of the formula I: ##STR1## wherein E.sup.1 and E.sup.2 are identical or different and are selected from the groupings ##STR2## --AR.sup.1 --, and --AR.sup.1 --X--AR.sup.2,where AR.sup.1 and Ar.sup.2 are the same or different 1,2-phenylene, 1,3-phenylene or 1,4-phenylene groups which may be substituted by (C.sub.1 -C.sub.6)-alkyl, (C.sub.1 -C.sub.6)-alkoxy, --CF.sub.3 or halogen and X denotesa) a direct bond or one of the following divalent groups: --O--, --C(CF.sub.3).sub.2 --, --SO.sub.2 --, --C(R.sup.1).sub.2 --, with R.sup.1 being hydrogen, (C.sub.1 -C.sub.6)-alkyl or fluoroalkyl having from 1 to 4 carbon atoms in the alkyl group or--Z--AR.sup.1 --Z--, where Z is one of the groups --O-- and --C(CH.sub.3).sub.2 or--O--Ar.sup.1 --Y--Ar.sup.2 --O--, where Y has the meaning given under Xa) above.The membrane has pronouned hydrophilic properties and is moreover stable to hydrolyzing agents and oxidants and to the action of heat. It is also resistant to organic solvents and microorganisms and exhibits low adsorption of proteins. A process for producing the membrane and a process for modifying the retention capacity thereof are also described. The membrane is produced by spreading a solution of the homogeneously miscible polymer blend on a planar substrate and precipitating the blend. Retention capacity is modified by heat treatment.

    摘要翻译: 描述了一种半透膜,其包含芳族聚酰胺和聚乙烯吡咯烷酮的均匀混溶聚合物共混物。 芳香族聚酰胺特别由式I的复发单元形成:其中E1和E2相同或不同,并且选自下列组合:IMAGE> IMA1 -AR1-和-AR1-X -AR2,其中AR1和Ar2是相同或不同的可以被(C1-C6) - 烷基,(C1-C6) - 烷氧基取代的1,2-亚苯基,1,3-亚苯基或1,4-亚苯基 ,-CF 3或卤素,X表示a)直接键或以下二价基团之一:-O - , - C(CF 3)2 - , - SO 2 - , - C(R 1)2 - ,其中R 1为氢, (C 1 -C 6) - 烷基或烷基中具有1至4个碳原子的氟烷基或-Z-AR 1-Z-,其中Z是基团-O-和-C(CH 3)2或-O- Ar1-Y-Ar2-O-,其中Y具有上述Xa)。 膜已经代表了亲水性质,此外对水解剂和氧化剂以及热的作用是稳定的。 它还耐有机溶剂和微生物,并且表现出低的蛋白质吸附。 还描述了制备膜的方法和改进其保留能力的方法。 通过将均匀混溶的聚合物共混物的溶液铺展在平面基材上并沉淀共混物来制备膜。 通过热处理修饰保留能力。

    Process for preparing sulphurous polymers
    8.
    发明授权
    Process for preparing sulphurous polymers 失效
    制备含硫聚合物的方法

    公开(公告)号:US06201098B1

    公开(公告)日:2001-03-13

    申请号:US09269700

    申请日:1999-05-24

    IPC分类号: C08G7514

    CPC分类号: C08G75/0254

    摘要: The invention concerns a process for preparing linear or branched sulphurous polymers such as polyarylene sulphides, in particular polyphenylene sulphide, from an aromatic dihalide compound and a sulphide in a solvent, wherein a) the aromatic dihalide compound and the sulphide are partially reacted; b) the resultant salt which is not dissolved in the reaction medium is separated off; and c) the reaction mixture largely freed of the salt is further polymerized.

    摘要翻译: 本发明涉及一种从芳族二卤化物化合物和硫化物在溶剂中制备直链或支链硫聚合物如聚亚芳基硫醚,特别是聚苯硫醚的方法,其中a)芳族二卤化物化合物和硫化物部分反应; b)将不溶于反应介质的所得盐分离出来; 和c)将大部分不含盐的反应混合物进一步聚合。

    Initiator
    10.
    发明授权
    Initiator 有权
    发起人

    公开(公告)号:US08691936B2

    公开(公告)日:2014-04-08

    申请号:US13527356

    申请日:2012-06-19

    IPC分类号: C08F6/00 C08G2/28 C09K3/00

    CPC分类号: C08G75/24 C08G2/06 C08G2/10

    摘要: An initiator for cationic polymerization comprises a salt of a protic acid as well as a protic add. The molar ratio of protic acid to salt is in the range from 1:0.01 to 1:2000. The initiator is used for example for cationic homo- or copolymerization of trioxane, and permits stable and flexible operation of the polymerization.

    摘要翻译: 阳离子聚合引发剂包括质子酸和质子酸的盐。 质子酸与盐的摩尔比在1:0.01至1:2000的范围内。 引发剂用于例如三恶烷的阳离子均聚或共聚,并且允许聚合的稳定和灵活的操作。