Method for making a polymer composition comprising cross-linked polyethylene

[Subject] The necessity of acquiring not only the polymer composite in which still lower rigidity is shown in relation to the known polymer composite containing ultrahigh molecular weight polyethylene but the method of manufacturing this polymer composite exists. [Solution means] The matrix of a bridge construction polyethylene molecule which is a polymer composite and has (a) free volume, (b) A squalane, fatty acid, glyceride, the poly isoprenoid, cholesterol, It is at least one sort of nonpolar living body affinity lipid chosen from cholesterol ester and the group which consists of those mixtures, and the polymer composite containing the nonpolar living body affinity lipid which is filling at least 1 portion of the above-mentioned free volume of the above-mentioned matrix is offered. Furthermore, the process of this polymer composite is offered. [Selection figure] Nothing