New acrylamide polymer, second-order nonlinear optical material and manufacturing method thereof

摘要

PROBLEM TO BE SOLVED: To obtain a high-molecular material which undergoes controlled relaxation of an orientation structure at high temperature and has secondary nonlinear optical characteristics with good heat stability by subjecting a polymer obtained through the radical polymerization of a specified aniline derivative to diazo coupling with nitroaniline. ;SOLUTION: An aniline derivative of formula I (wherein R¹ is H or methyl; and R² is H, or methyl bound at a position other than the 4-position) is subjected to radical polymerization in the presence of 0.05-5.0 wt.% radical polymerization initiator at 50-100°C for 10-50 hr to give a polymer having a weight-average molecular weight of 42,000 to 270,000. This polymer is subjected to diazo coupling with nitroaniline to introduce at least 20 mol.%, preferably 25-95 mol.%, azo groups, thus giving a nonlinear acrylamide polymer consisting of constituent units of formula II and those of formula II, and having a weight-average molecular weight of 50,000 to 300,000, an optimum poling temperature of 150-170°C, and an initial d₃₃ value at 80°C of at least 200×10^-9 esu.;COPYRIGHT: (C)1998,JPO