摘要:
One catalyst-free method of forming a polyurethane comprises forming a first emulsion comprising a first monomer, a surfactant, a water immiscible organic solvent, and water. The first monomer comprises two or more pentafluorophenyl carbonate groups. The first emulsion is combined with an aqueous mixture containing a second monomer comprising two or more nucleophilic amine groups, thereby forming a second emulsion. The first and second monomers of the second emulsion are allowed to react by interfacial polymerization, thereby forming a polyurethane. The polyurethane can have a number average molecular weight (Mn) of about 30000 to about 80000. The method is compatible with introducing pendant functionality into the polyurethane by way of cyclic carbonate precursors to the first monomer.
摘要:
The invention provides a technique enabling the separation and recovery of an unreacted fluoromonomer from an aqueous fluoropolymer dispersion obtained by emulsion polymerization, without using any extraction solvent, and enabling the prevention of a hydrolysis of —SO2F and a like sulfonic acid precursor functional group convertible to sulfonic acid group. Thus, the invention provides a recovering method fluoromonomer having a sulfonic acid precursor functional group convertible to a sulfonic acid group and remaining unreacted from an aqueous fluoropolymer dispersion obtained by emulsion polymerization of the fluoromonomer, wherein the unreacted fluoromonomer is recovered from the aqueous fluoropolymer dispersion by evaporation, wherein the aqueous fluoropolymer dispersion has an acidic pH.
摘要:
The present invention relates to a block copolymer having at least one block having an acid group and at least one block having substantially no acid group, wherein one end group of a repeating unit in at least one block of all blocks is oxygen and/or sulfur, and at least one repeating unit of a block having substantially no acid group contains a halogen atom. The block copolymer of the present invention gives a polymer electrolyte membrane which is excellent not only in heat resistance and proton conductivity but also in water resistance and chemical stability, and is useful as an electrolyte for a proton conducting membrane etc. of a fuel cell.
摘要:
An object of the invention is to provide a fluorine-containing (meth)acrylate polymer readily at a low cost without using any special polymerization facilities. Thus, the invention provides a fluorine-containing (meth)acrylate polymer obtained by reacting a (meth)acrylate polymer with an alcohol containing a fluorine atom represented by General Formula 1: Rf(CH2)nOH (1) wherein Rf is a fluoroalkyl group or a fluoroalkyl ether group of 1 to 15 carbon atoms containing at least one or more fluorine atoms and n is an integer of 0 to 10 as well as a method for producing the same.
摘要:
The present invention provides a method for production of a copolymer for photoresists in which the bias of the monomer composition ration is small. This method for production is a method for production of a copolymer for photoresists, which copolymer containing at least two types of repeating units, the method having a supplying step of supplying a monomer solution and a solution containing a polymerization initiator into a polymerization reaction system, wherein the range of fluctuation of the monomer composition ratio of unreacted monomers is within the range between minus 15% and plus 15% or the standard deviation of the monomer composition ratio of unreacted monomers is within 2 in the polymerization reaction system during the period from the start of the polymerization reaction to the end of supplying of the monomer solution.
摘要:
To provide a process for producing fluoropolymer particles, whereby formation of fine particles is suppressed.A process for producing fluoropolymer particles, which comprises (i) a step of preparing a solution or dispersion of a fluoropolymer (A) having the fluoropolymer (A) dissolved or dispersed in a solvent (B), wherein the solvent (B) contains a good solvent (B2) whereby the degree of swelling of the fluoropolymer (A) exceeds 50%, and the degree of swelling of the fluoropolymer (A) by the solvent (B) is from 50 to 1,200%; and (ii) a step of mixing the solution or dispersion of a fluoropolymer (A) with a solvent (C) to flocculate the fluoropolymer (A) thereby to form particles of the fluoropolymer (A), wherein the solvent (C) contains a poor solvent (C1) whereby the degree of swelling of the fluoropolymer (A) is at most 50%, the degree of swelling of the fluoropolymer (A) by a mixed solvent (BC) of the solvents (B) and (C) is from 0 to 100%, the ratio (WC/WB) of the mass (WC) of the solvent (C) to the mass (WB) of the solvent (B) is from 1 to 5, and the ratio (SBC/SB) of the degree of swelling (SBC) of the fluoropolymer (A) by the mixed solvent (BC) to the degree of swelling (SB) of the fluoropolymer (A) by the solvent (B) is at most 0.5.
摘要:
The presently disclosed subject matter describes the use of fluorinated elastomer-based materials, in particular perfluoropolyether (PFPE)-based materials, in high-resolution soft or imprint lithographic applications, such as micro- and nanoscale replica molding, and the first nano-contact molding of organic materials to generate high fidelity features using an elastomeric mold. Accordingly, the presently disclosed subject matter describes a method for producing free-standing, isolated nanostructures of any shape using soft or imprint lithography technique.
摘要:
Partially and fully fluorinated alkyl substituted thienothiophene monomers (and polymers thereof) wherein the monomers are represented by the formula: wherein R is a partially or fully fluorinated primary, secondary or tertiary alkyl having from 1 to 8 carbon atoms; and X and X′ are independently selected from the group consisting of H, F, Cl, Br, I, MgCl, MgBr, Mgl, Sn(R′)3, CH═CHR″, —OR″, —COOR″, —S—COR″, —B(OR″)2, —COR″, —C≡CH, and a polymerizable cyclic pi-conjugated carbon-ring structure optionally comprising S, N or O heteroatoms; wherein R′ is a primary, secondary or tertiary alkyl having from 1 to 6 carbon atoms, and R″ is H or a primary, secondary or tertiary alkyl having from 1 to 6 carbon atoms.
摘要:
There is disclosed a polymer at least comprising repeating units represented by the following general formulae (1) and (2), and the polymer having a mass average molecular weight of 1,000 to 500,000. There can be provided a polymer, and a resist composition, in particular, a chemically amplified positive resist composition that exhibit higher resolution than conventional positive resist compositions, good in-plane dimension uniformity of developed resist patterns on substrates such as mask blanks and high etching resistance.
摘要:
A process for preparing peroxidic perfluoropolyethers having a perioxidic content (PO) lower than or equal to 1.2 of formula A-CF2O(CF2CF2O)m(CF2O)n—(CF2CF2OO)m1(CF2OO)n1CF2—B (I) Wherein A, B equal to or different from each other are —C1, —F, —F2CC1, —COF, —OCOF, —CF3, m, m1, n, n1 are integers such that the (m+m1)/(n+n1) ratio is between 0.6 and 1.3 and the m/n ration is between 0.5 and 1.2; the number average molecular weight is in the range 35,000-45,000, by tetrafluoroethylene (TFE) photooxidation in the presence of UV light, at a temperature from −80° C. to −40° C., in the presence of a mixture of solvents formed of HFC-227 (hepta-fluoropropane) and a solvent selected between HFC-125 (pentafluoroethane) and FC-218 (perfluoropropane).
摘要翻译:一种制备过氧化全氟聚醚的方法,该过氧化全氟聚醚具有低于或等于式(β)的1.2的线型式描述=“在线公式”中的最大值=“铅”→A-CF2 (CF 2 O 2)O(CF 2 O 2)O(CF 2 O 2)n(CF 2 O 2)n (CF 2 O 2)m1(CF 2 O 2)n1(CF 2 O 2)n1 其中A,B等于或不同于每一个,其中A,B等于或不同于每个 其它是-C1,-F,-F2C1,-COF,-OCOF,-CF3,m,m1,n,n1是整数,使得( m + m1)/(n + n1)的比例在0.6和1.3之间,m / n比在0.5和1.2之间; 在UV光的存在下,在-80℃至-40℃的温度下,在溶剂混合物存在下,数均分子量在35,000-45,000范围内,通过四氟乙烯(TFE)光氧化 由HFC-227(七氟丙烷)和选自HFC-125(五氟乙烷)和FC-218(全氟丙烷)之间的溶剂形成。