Synthesis and photochromic behavior of new polyimides containing azobenzene side groups

被引：67

作者：

Sava, Ion ^{[1
]}

Resmerita, Ana-Maria ^{[2
]}

Lisa, Gabriela ^{[2
]}

Damian, Victor ^{[3
]}

Hurduc, Nicolae ^{[2
]}

机构：

[1] Petru Poni Inst Macromol Chem, Iasi 700487, Romania

[2] Tech Univ Gh Asachi Iasi, Dept Nat & Synthet Polymers, Iasi 700050, Romania

[3] Natl Inst Laser Plasma & Radiat Phys, Bucharest, Romania

来源：

POLYMER | 2008年 / 49卷 / 06期

关键词：

azo-polyimides; photochromic behavior; thermal stability;

D O I：

10.1016/j.polymer.2008.02.004

中图分类号：

O63 [高分子化学（高聚物）];

学科分类号：

070305 ; 080501 ; 081704 ;

摘要：

Aromatic polyimides containing side azobenzene groups have been synthesized by low-temperature solution polycondensation of certain aromatic dianhydrides with aromatic diamines containing preformed side azobenzene groups followed by chemical imidization at 100 degrees C in the presence of pyridine and acetic anhydride. The weight average molecular weight of these polymers is in the range of 16,000-129,000. The glass transition temperature of these polyimides is in the range of 185-230 degrees C. The polymer architecture presents a special characteristic, one of the azobenzene aromatic units being in the main chain of the polymer. This situation is intermediary between main-chain and side-chain azobenzene-containing polymers. The photochromic behavior, determined by the trans-cis isomerization process of azo-groups, in solution and in solid state, was evaluated. The synthesized polyimides were studied by spectral methods (UV, IR), thermal analysis and molecular modeling. A preliminary study concerning the surface structuration capacity of the polyimides was accomplished. Good results were obtained using Nd:YAG laser at 355 nm, at an incident fluence of 35 mJ/cm(2) (situated below the laser ablation limit). (c) 2008 Elsevier Ltd. All rights reserved.

引用

页码：1475 / 1482

页数：8