Abstract:
A method of producing a porous membrane by gelation in a non-solvent medium of a solution of an aromatic ether ketone polymer in a strong acid which is substantially non-sulphonating to the polymer is characterised by the step of including a dissolved polymer in the gelation medium. The method allows the fabrication of membranes with pore sizes in the nanofiltration and low-ultrafiltration range having sufficient permeability for industrial and commercial application.
Abstract:
A copolyester comprising repeating units derived from an aliphatic glycol, an aromatic dicarboxylic acid, and the monomer of formula (I): (Formula (I)) wherein n = 2, 3 or 4, Z is S(=O) 2 , and wherein comonomer (I) constitutes a proportion of the glycol fraction of the copolyester; and films, fibres, moulding compositions or moulded articles comprising said copolyester.
Abstract:
A copolyester comprising repeating units derived from an aliphatic glycol, terephthalic acid, and the monomer of formula (I): wherein n = 2, 3 or 4, and films, fibres, moulding compositions and moulded articles made therefrom.
Abstract:
The present invention relates to a process for manufacturing a polymer composition comprising an adsorbent solid entrained within a polymer matrix, the process comprising polymerising a molten monomer composition containing the adsorbent solid. The adsorbent solid may be a desiccant or an odour control solid. The polymer matrix is preferably nylon-6.
Abstract:
A film comprising a copolyester wherein said copolyester comprises repeating units derived from an aliphatic glycol, an aromatic dicarboxylic acid, and a comonomer (M) selected from the group consisting of N,N '-bis-(2-hydroxyalkyl)-bicyclo-[2,2,2]-oct-7- ene-2,3,5,6-tetracarboxylic diimide(BODI)and 2-hydroxyalkyl-2-[p-(2- hydroxyethoxycarbonyl)phenyl]-1,3-dioxo-2H-isoindole-5-carboxylate (DOIC), wherein the number of carbon atoms is the 2-hydroxyalkyl group is 2, 3 or 4, and wherein comonomer (M) constitutes a proportion of the glycol fraction of the copolyester.
Abstract:
A polyester film comprising a copolyester which comprises repeating units derived from an aliphatic glycol, an aromatic dicarboxylic acid, and the monomer of formula (I): wherein n = 2, 3 or 4, and wherein comonomer (I) constitutes a proportion of the glycol fraction of the copolyester.
Abstract:
An ion-conducting membrane comprising a polymer component and a macrocyclic compound, wherein the macrocyclic compound is functionalised with one or more ion-conducting groups is disclosed. The membrane is suitable for use in a fuel cell.
Abstract:
An ion-conducting polymer wherein at least 80% of the repeat units comprise an ion-conducting region and a spacer region is disclosed. The ion-conducting region has an aromatic backbone of one or more aromatic groups, wherein at least one ion-conducting functional group is attached to each aromatic group. The spacer region has an aromatic backbone of at least four aromatic groups, wherein no ion-conducting functional groups are attached to the aromatic backbone. The polymer is suitable for use as a fuel cell membrane, and can be incorporated into membrane electrode assemblies.
Abstract:
A porous membrane is produced by gelation in a non-solvent medium of an aromatic ether ketone polymer dissolved in a strong acid which is substantially non-sulphonating to the polymer. The polyether ketone solution includes a polymer additive which is not substantially degraded by the strong acid and which is soluble both in the strong acid, the non-solvent and mixtures thereof. The gelation medium may, for example, be aqueous and the polymer additive may be polyvinylpyrrolidone. Membranes produced by the method of the invention have good overall performance and flux at any given molecular weight cut-off.
Abstract:
A polymer characterised by the presence of ylid linkages in the main polymer chain of formula (A) where the dashed line represents the remainder of a ring system for which the N provides a heteroatom, and E is a strongly electron withdrawing group. Preferred polymers in accordance with the invention are characterised by the presence of linkages in the polymer main chain of formula (I). The polymers of the invention may be fabricated as membranes for use in various separation processes, e.g. ultrafiltration, nanofiltration, and reverse osmosis.