▎ 摘　　要

NOVELTY - A subsea electrical connector or electrical cable (1) comprises a conductor (2), an insulator (4) coaxial with conductor, and a volumetric compensating diaphragm located radially outwardly of insulator and/or a termination boot. The diaphragm or termination boot contains compound layer comprising a graphene nano-platelet additive incorporated into a crosslinked polymer matrix to produce a polymer composite. USE - A subsea electrical connector or electrical cable. ADVANTAGE - A desired level of mechanical flexibility, permeation resistance, and conduction is provided in the components of a cable connector by providing a flexible material in which permeation of liquid and/or gas media through the material is inhibited, while simultaneously introducing electrical conductivity into the material by incorporation of a 2nd material into a base material. The 2nd material increases the diffusion path length and provides conductivity, without the complications of using multiple additives having different properties and different drawbacks. Graphene nano-platelets are aligned in the same direction, perpendicular to a diffusion path of water through the component, which improves the permeation resistance of the material via the tortuous path model. The greater the angle at which the graphene nano platelets are orientated relative to the diffusion path of water through the diaphragm, the better the performance achieved. DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for: (1) manufacture of component of electrical connector or electrical cable which involves creating a compound layer of the component by determining proportions of graphene nanoplatelets and a crosslinked polymer matrix for the component, incorporating the graphene nano-platelets into the crosslinked polymer matrix in the determined proportions to produce a polymer composite, and forming the component from the polymer composite; and (2) manufacture of subsea connector or subsea cable which involves manufacturing a component of electrical connector or electrical cable and coupling the component to an insulating layer (4) of the connector or cable. DESCRIPTION OF DRAWING(S) - The drawing shows a schematic diagram of a subsea cable. Cable (1) Conductor (2) Inner semi-conductive layer (3) Insulator (4) Outer semi-conductive layer (5)