Mixture of polymers, lubricating fluid and porous materials comprising said mixture, and surface bearing said mixture

A synthetic synovial fluid comprising:

• a bottle-brush polymer comprising a polymeric backbone with polymeric pendant chains with capping blocks bearing amine groups attached at both ends of said backbone,
• wherein the polymeric backbone with polymeric pendant chains form a copolymer of formula:
• and
• a linear polymer which is hyaluronic acid or poly(vinylpyrrolidone) or a pharmaceutically acceptable salt thereof,
• the bottle-brush polymer and the linear polymer being dissolved together in a solvent.

A method of lubricating a tissue of a living body, the method comprising the step of contacting a lubricating fluid with said tissue, wherein the lubricating fluid comprises:

• a bottle-brush polymer comprising a polymeric backbone with polymeric pendant chains with capping blocks bearing amine groups attached at both ends of said backbone,
• wherein the polymeric backbone with polymeric pendant chains form a copolymer of formula:
• and
• a linear polymer which is hyaluronic acid or poly(vinylpyrrolidone) or a pharmaceutically acceptable salt thereof,
• the bottle-brush polymer and the linear polymer being dissolved together in a solvent.