Bottlebrush polymer compositions, lubricating fluid, porous materials comprising said compositions, and surface bearing said compositions

A surface bearing a polymeric layer, the polymeric layer comprising:

• a. 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
• b. a linear polymer which is hyaluronic acid or poly(vinylpyrrolidone) or a pharmaceutically acceptable salt thereof.

A porous material having embedded therein:

• a. 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
• b. a linear polymer which is hyaluronic acid or poly(vinylpyrrolidone) or a pharmaceutically acceptable salt thereof.