Optical-limiting effect of C_(60) bonded poly(N-vinylcarbazole) initiated with C_(60)Cl_n/CuCl/Bpy catalyst system

摘要

C_(60) bonded poly(N-vinylcarbazole) (PVK) has been synthesized by C_(60)Cl_n, (the average value of n is 20; C_(60)/C_(70)=85:15)/CuCl/2,2' -bipyridine (Bpy) catalyst system. The molecular distribution curve determined by gel permeation chromatography (GPC) with RI and UV dual detector and ~1H-nuclear magnetic resonance (~1H-NMR) of the C_(60)-PVK verified that the polymerization mechanism was atom transfer radical polymerization (ATRP). The optical-limiting properties of C_(60)/C_(70)-PVK and C_(60)-PVK with different C_(60) content were measured via a nanosecond Nd:YAG pulse laser system at a wavelength of 532 nm. The experimental results demonstrated that the optical-limiting behavior of C_(60)-PVK and C_(60)/C_(70)-PVK was better than that of C_(60)Cl_n, C_(60)/C_(70)Cl_n and approached to pristine C_(60). The optical-limiting performance was improved upon the addition of increasing concentrations of C_(60)(C_(60)/C_(70)) in C_(60)-PVK (C_(60)/ C_(70)-PVK).