Composite material and its method of production

A process for producing a composite material comprising a first segment covalently bonded to a second segment by a urethane and optionally a urea and/or an amide linkage,

• wherein the first segment is a carbon nanoparticle moiety and the second segment is a polyol moiety,
• the process comprising a first step of polymerising
• (i) a functionalised carbon nanoparticle,
• (ii) a polyol,
• (iii) a compound comprising at least two isocyanate groups, and optionally
• (iv) a chain extending compound comprising at least two chemical groups selected from the group consisting of a primary amine, an hydroxyl and a carboxylic group,
• wherein functionalised means functionalised with any one of carboxylic acid, tertiary alcoholic, epoxide, primary alcoholic or primary amino groups;
• and
• wherein the process comprises adding (iii) to a solution of (i) in (ii) and polymerising (i), (ii) and (iii).