a composition of matter , comparising : a chemically functionalized carboxylate - alumoxane that is functionalized with a chemically reactive substituent , and a reactive compound , wherein the chemically reactive substituent reacts with the reactive compound so as to link the carboxylate - alumoxnae to the reactive compound and form a polymer matrix . the functional groups on the carboxylate - alumoxane can vary depending on the desired properties of the matrix . also , the composition of matter may comprise a cross - linked matrix in which the cross - linked components consist of functionalized alumoxanes .