Provided are polymer compositions made by a process comprising: (a) providing a first reactive composition containing: (i) a polymerization initiator that is capable, upon a first activation, of forming two or more free radical groups, at least one of which is further activatable by subsequent activation; (ii) one or more ethylenically unsaturated compounds; and (iii) a crosslinker; (b) subjecting the first reactive composition to a first activation step such that the first reactive composition polymerizes therein to form a crosslinked substrate network containing a covalently bound activatable free radical initiator, (c) combining the crosslinked substrate network with a second reactive composition containing one or more ethylenically unsaturated compounds; and (d) activating the covalently bound activatable free radical initiator of the crosslinked substrate network such that the second reactive composition polymerizes therein with the crosslinked substrate network to form a grafted polymeric network and a byproduct polymer. Also provided are precursors to the polymer compositions, processes for preparation of the polymer compositions, and methods of using the polymer compositions, for instance in medical devices.
所提供的聚合物组合物是通过以下工艺制成的: (a) 提供第一种活性组合物,该组合物含有(i) 聚合
引发剂,该
引发剂在第一次活化时能够形成两个或两个以上的自由基,其中至少一个自由基可通过后续活化进一步活化;(ii) 一个或多个
乙烯基不饱和化合物;以及 (iii)
交联剂;(b) 将第一反应性组合物进行第一活化步骤,使第一反应性组合物在其中聚合,形成含有共价结合的可活化自由基
引发剂的交联基底网络, (c) 将交联基底网络与含有一种或多种
乙烯基不饱和化合物的第二反应性组合物结合;(d) 活化交联基底网络中的共价结合的可活化自由基
引发剂,使第二反应性组合物与交联基底网络在其中聚合,形成接枝聚合物网络和副产物聚合物。此外,还提供了聚合物组合物的前体、聚合物组合物的制备工艺以及聚合物组合物的使用方法,例如在医疗设备中的使用方法。