含三氟甲基偶氮生色团环氧树脂类聚合物合成和光致表面自结构研究

利用后重氮偶合反应,将4-(三氟甲基)苯胺的重氮盐与两种具有高苯胺残基密度的环氧树脂类前体聚合物在极性有机溶剂中反应,制备了两种具有高生色团密度的环氧树脂类偶氮聚合物PEP-AZ-CF3和PEP-35AZ-CF3.利用1H-NMR、FTIR、UV-Vis和DSC等分析方法对2种偶氮聚合物结构、热性能及吸收光谱性能进行了分析及表征.研究了在不同波长的激光(488、532及589 nm)照射下,2种偶氮聚合物薄膜光致表面自结构的形成.研究结果表明,入射激光的波长对偶氮聚合物表面自结构现象的形成有明显影响.仅在波长488 nm的偏振激光(线偏振光或圆偏振光)照射下,2种偶氮聚合物薄膜表面能观察到自结构现象.圆偏光比线偏光更有利于诱导表面起伏结构的形成,但形成的表面结构不具备长程取向有序性.聚合物生色团中偶氮键邻位的取代甲基对表面自结构的形成起到阻碍作用.

PHOTOINDUCED SELF-STRUCTURED SURFACE PATTERNS ON FILMS OF EPOXY-BASED POLYMERS CONTAINING TRIFLUOROMETHYLSUBSTITUTED AZO CHROMOPHORES

Two epoxy-based azo polymers(PEP-AZ-CF3 and PEP-35AZ-CF3) containing trifluoromethyl-substituted azo chromophores with high density were synthesized by using post-polymerization azo-coupling reactions between two epoxy-based precursor polymers(PEP-AN and PEP-35AN) and diazonium salt of 4-(trifluoromethyl)aniline.The structures and properties of these two azo polymers were characterized by using 1H-NMR,FTIR,UV-Vis and thermal analyses.The self-structured surface pattern formation of these two azo polymers was studied by irradiating the polymer films with laser light at three different wavelengths(488,532,and 589 nm) under a normal incident condition.The incident laser light was linearly or circularly polarized.The intensity of the incident laser light was 200 mW/cm2 and the irradiation time was 30 min.The results indicate that the photoinduced self-structured surface patterns could be formed on films of both azo polymers only when the azo polymer films were irradiated with the laser light at 488 nm.The photoinduced self-structured surface pattern formation showed close correlation with the wavelength of incident laser light.Compared with the linearly polarized laser light,the circularly polarized laser light could induce the patterns with higher saturated amplitudes.The methyl substituents in anilino moieties of the azo groups in 3,5 positions showed steric hindrance to the self-structured surface pattern formation.