萘并萘醌酚醛树脂的合成和光致变色性质

通过6-氯-5，12-萘并萘醌(1)与酚醛树脂经亲棱取代，一步合成制备具有光致变色性的酚醛树脂(3)。在苯溶液中，光致变色聚合物(3)与光致变色化合物6-{4-2-(4-羟基苯基)异丙基]苯氧基}-5，12-萘并萘醌(2)有相似的光致变色行为。但是，在聚合物(3)中，由于苯基处于聚合物骨架中不易迁移，使聚合物(3)的变色速度较化合物(2)明显减慢，化合物(2)的光异构化速度常数是聚合物(3)的3倍。同时发现溶剂对聚合物(3)的光诱导trans-ana异构化反应速度有明显影响，在氯仿中的反应速度常数约为在苯中的2倍。

Synthesis and Photochromism of Naphthacenequinone Phenolic Resin

A new photochromic phenolic resin(3) was synthesized by a one-step method, i.e.6-chloro-5,12-naphthacenequinone(1) reacting with phenolic resin. The polymer(3) has similar photochromic properties with photochromic compound 6-{4-\phenoxy}-5,12-naphthacenequinone(2), but compare(3) with compound(2) ,the rate constants of (3) were about one third as (2) in benzene because the phenyl is not easy to move in the polymer main chain. It is also found that solvent has significant effect on the rate of photoisomerization of polymer. The rate constants in chloroform are about 3 times as that in benzene.