PROBLEM TO BE SOLVED: To provide a surface modification method for vulcanized rubber that can provide various functions such as slidability, liquid leakage resistance and protein adsorption inhibition economically and advantageously, and a surface modified elastic body.SOLUTION: Provided is a surface modification method, which is a surface modification method in which a vulcanized rubber is the modification target, including: a step 1 for forming a polymerization initiation point A on the surface of the modification target； a step 2 of growing a polymer chain by radical polymerization of a monomer starting from the polymerization initiation point A； and a step 3 of adding a silane compound to the surface of the polymer chain and further at least reacting a fluoroalkyl group-containing silane compound to form a modified polymer chain.SELECTED DRAWING: NoneCOPYRIGHT: (C)2020,JPO&INPIT【課題】摺動性、耐液漏れ性、タンパク質吸着抑制性などの様々な機能性を経済的に有利に付与できる加硫ゴムの表面改質方法、及び表面改質弾性体を提供する。【解決手段】加硫ゴムを改質対象物とする表面改質方法であって、前記改質対象物の表面に重合開始点Ａを形成する工程１と、前記重合開始点Ａを起点にしてモノマーをラジカル重合させてポリマー鎖を成長させる工程２と、前記ポリマー鎖の表面にシラン化合物を付加させ、更に少なくともフルオロアルキル基含有シラン化合物を反応させて、改質ポリマー鎖を形成する工程３とを含む表面改質方法。【選択図】なし
