Abstract:
A liquid composition comprising: a liquid medium comprising at least one aprotic polar organic solvent and less than 25 wt % based on the total weight of the composition of an alcohol; and at least 5 wt % based on the total weight of the composition of at least one fluorinated anion exchange polymer comprising a fluorocarbon backbone and side-chains covalently attached to the backbone having terminal groups of formula (I): —SO2NR1Q+X−, wherein Q+ is a group comprising at least one quaternary nitrogen atom, and R1 is H or a C1-C20 alkyl group, or forms a ring together with a group in Q+, wherein the ring contains 2 to 10 carbon atoms and, optionally, up to 4 heteroatoms; and X− is an anion selected among the group consisting of organic anions and lipophilic inorganic anions is disclosed. The liquid composition is suitable for the preparation of ion exchange membranes and as binders for electrocatalytic layers for use in electrochemical applications.
Abstract:
A process for preparing perfluoropolyethers of formula T-O—(RF)z-T′ (I) wherein: T, T′ are end groups, z=0 or 1; RF is a perfluoro(poly)oxyalkylene chain containing one or more fluorooxyalkylene repeating units selected from the group consisting of (CF2O), —(CF(CF3)O)—, —(CF2CF2O)—, —(CF2CF(CF3)O)—, —(CF(CF3)CF2O)—, —(CF2CF2CF2O)—, —(CF2CF2CF2CF2O)—, and —(CF2)j—CFZ—O— wherein j is an integer from 0 to 3, and Z is a fluorooxyalkylene chain comprising from 1 to 20 repeating units selected from the above reported fluorooxyalkylene units; comprising the reduction of peroxidic perfluoropolyethers comprising one or more of the above defined repeating units by using gaseous hydrogen in the presence of a catalyst comprising one or more metals of the VIII group supported on graphitic materials.
Abstract:
A process for preparing monocarboxylic perfluoropolyethers of formula: A-O-(RF)z-(CFY)t-C(O)OX (I) wherein: X is H, C1-C10 alkyl, or an aryl group; Y=F, CF3; t=1, 2 or 3; A is a C1-C4 perfluoroalkyl end group; z=0 or 1; RF is a perfluorooxyalkylene chain; having a number average molecular weight in the range 180-8,000; comprising the following steps: a) one or more distillations of perfluoropolyethers (PFPE) of formula T-O-(RF)z-T′ (II) wherein: z and RF are as above defined; T, T′, equal to or different from each other, are selected from acyl fluoride or carbonyl-containing functional end groups and non functional end groups to obtain one PFPE fraction of formula (II) wherein the difference between the minimum and the maximum molecular weight of the components is lower than or equal to 600; b) partial fluorination of the fraction obtained in a); c) esterification c1) and/or hydrolysis c2) of the mixture obtained in b); d) distillation of the product obtained in c2) or in c1).
Abstract translation:一种制备式A-O-(RF)z-(CFY)t-C(O)OX(I)的单羧基全氟聚醚的方法,其中:X为H,C 1 -C 10烷基或芳基; Y = F,CF3; t = 1,2或3; A是C1-C4全氟烷基端基; z = 0或1; RF是全氟代亚烷基链; 数均分子量在180-8,000范围内; 包括以下步骤:a)式T-O-(RF)z-T'(II)的全氟聚醚(PFPE)的一个或多个蒸馏,其中:z和RF如上所定义; T,T'彼此相同或不同,选自酰基氟或含羰基的官能端基和非官能端基,以获得一种式(II)的PFPE级分,其中最小和最大分子之间的差异 部件重量低于或等于600; b)在a)中获得的级分的部分氟化; c)在b)中获得的混合物的酯化c1)和/或水解c2); d)蒸馏在c2)或c1)中得到的产物。
Abstract:
Peroxidic perfluoropolyethers having formula: X1—O(CF2O)n1(CF2CF2O)m1(CF2(CF2)zCF2O)p1(O)h—X2 (I) wherein: X1 and X2, equal to or different from each other, are chain end groups selected between —CF2COF and —COF; n1, m1, p1 and h are integers such that the number average molecular weight is in the range 700-100,000; z=1 or 2; with the proviso that: the m1/n1 ratio is between 0.2 and 10; the p1/(n1+m1) ratio is lower than 0.05; the h/(n1+m1+p1) ratio is such that the PO content, defined as grams of active oxygen/100 g of compound, is in the range 0.8-4.5, preferably 1.4-3.8; the perfluorooxyalkylene units being statistically distributed along the polymeric chain.
Abstract:
A process for preparing peroxidic perfluoropolyethers having a peroxidic content (PO) higher than 1.2 of formula A-CF2O(CF2CF2O)m(CF2O)n—(CF2CF2OO)ml(CF2OO)nlCF2—B (I) wherein A, B, equal to or different from each other are Cl—, F—, ClCF2—, COF—, —OCOF, —CF3, m, ml, n, nl are integers such that the (m+ml)/(n+nl) ratio is between 0.9 and 5 and the m/n ratio is between 0.8 and 3, 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 (heptafluoropropane) and a solvent selected from HFC-125 (pentafluoroethane) and FC-218 (perfluoropropane).
Abstract translation:一种制备过氧化物全氟聚醚的方法,其过氧化物含量(PO)高于式?的线性公式描述=“在线公式”中的结果=“铅”→A-CF 2 SUB (CF 2 O 2 CF 2)O(CF 2 O 2)O(CF 2 O 2)O(CF 2) - (CF 2)2 CF 2 O 2)(CF 2 O 2)n1 SUB 其中A,B彼此相同或不同,其中A,B,B,C, Cl - ,F-,ClCF 2 - ,COF-,-OCOF,-CF 3,m,m,n,nl是整数,使得(m + )/(n + nl)比为0.9〜5,m / n比为0.8〜3,数均分子量在35,000-45,000范围内,在紫外光下存在四氟乙烯(TFE)光氧化 在由HFC-227(七氟丙烷)和选自HFC-125(五氟乙烷)和FC-218(全氟代)的溶剂形成的溶剂的混合物存在下,在-80℃至-40℃的温度下 丙烷)。
Abstract:
This invention relates fluorinated polymers having high structural regularity, characterized by a high maximum operating temperature and by improved mechanical and processability properties, prepared by a (co)polymerization process of fluorinated olefinic monomers, optionally in association with non-fluorinated olefins, in aqueous emulsion, in the presence of radical photoinitiators and of ultraviolet-visible radiation.
Abstract:
A process for transferring heat comprising the following steps: (1) transferring heat from a body to a first heat transfer system by means of a secondary loop passageway comprising a heat transfer fluid and, optionally, (2) transferring heat from a second heat transfer system to said body by means of said secondary loop passageway comprising said heat transfer fluid, wherein: said second heat transfer system being the same as or different from said first heat transfer system, said secondary loop passageway comprises at least one polymer sealant selected from a rubber seal and a plastic pipe; and said heat transfer fluid comprises one or more linear perfluoropolyethers having formula RF—(OCF2)n(OCF2CF2)m(OCF2(CF2)zCF2)p—ORF (I), wherein RF, equal or different at each occurrence, is a C1-C3 perfluoroalkyl group, m, n and p, equal to or different from each other, are integers comprised between 0 and 100, the sum m+n being higher than 0, and z is equal to 1 or 2, and wherein said heat transfer fluid is circulated through said secondary loop passageway in step (1) for transferring said heat from said body to said first heat transfer system and, optionally, in step (2) for transferring said heat from said second heat transfer system to said body.
Abstract:
The invention pertains to novel (per)fluoropolyethers comprising at least one (per)fluoropolyoxyalkylene chain (chain Rf) comprising at least one recurring unit (R2) having formula: CF2—CF(CF2OSO2F)—O— (poly(fluorosulfate) PFPE) to a process for their manufacture, and to their use for providing functional (per)fluoropolyethers.
Abstract translation:本发明涉及包含至少一种(全)氟聚氧化烯链(链Rf)的新型(全)氟聚醚,其包含至少一个具有式CF 2 CF(CF 2 OSO 2 F)-O-(聚(氟硫酸酯)PFPE)的重复单元(R2) 涉及其制造方法及其用于提供功能性(全)氟聚醚的用途。
Abstract:
A method for the preparation of corrugated fuel cell units from a composite laminate comprising an ion conductive membrane having first and second surface; a first electrocatalyst layer in contact with the first surface of the membrane; a second electrocatalyst layer in contact with the second surface of the membrane; a first metallic mesh in contact with said first electrocatalyst layer and a second metallic mesh in contact with said second electrocatalyst layer.
Abstract:
The invention pertains to a thermoplastic fluoropolymer composition comprising: at least one thermoplastic partially fluorinated fluoropolymer having a melt flow index (MFI) of less than 10 g/10 min, as measured according to ASTM D-1238 under a piston load of 5 kg polymer A; from 0.05 to 5% by weight of A at least one (per)fluoropolyether, polymer B; and from 0 to 10% by weight of A of at least one per(halo)fluoropolymer polymer C. The addition of a (per)fluoropolyether B and, optionally, of a per(halo)fluoropolymer C advantageously enables improvement of rheological behavior of thermoplastic partially fluorinated fluoropolymer A, making possible processing in less severe conditions and yielding final parts with outstanding surface aspect and good homogeneity and coherency. Still objects of the inventions are the process for manufacturing said thermoplastic fluoropolymer composition and the articles thereof.