蓝光共轭聚合物:聚(2,5-二己氧基)苯的合成及表征

Synthesis and Characterization of Blue Luminescent Material: Poly(2,5-dihexyloxyparaphenylene)

以三氯甲烷为溶剂,采用三氯化铁氧化偶联反应合成了一种可溶性对称烷氧基取代聚对苯衍生物:聚(2,5-二己氧基)苯(DHO-PPP)。该聚合物可以很容易地通过溶液方式成膜,聚合物的结构通过红外光谱、核磁共振氢谱得到了确认,发现其中含有45%的聚(2,5-二己氧基-1,3)苯成分。在紫外-可见吸收光谱上,聚合物的三氯甲烷溶液的最大吸收峰位于351nm,与无取代的聚对苯相比红移了50nm。在300nm激发光下,聚合物的氯仿溶液发出了423.8nm的蓝光,表明材料是一种良好的蓝光材料。热重分析表明聚合物具有非常优异的热稳定性,在300℃时的质量损失只有2%。差示扫描量热法分析表明聚合物的玻璃化转变温度为102.34℃。X射线衍射分析表明,DHO-PPP是一种具有部分微晶结构的材料。

Poly（2,5-dihexyloxyparaphenylene）（DHO PPP） which is soluble in common organic solvent has been synthesized by oxidation coupling polymerization of 1,4-dihexyloxybenzene using iron chloride as catalyst in chloroform. The resulting polymer DHO-PPP is readily soluble in common organic solvents and can be easily processed into uniform films from solution. The structure of DH（）-PPP is confirmed by FTIR. The content of 1,3-linkage in the polymer is calculated to be 45%, according to nuclear magnetic resonance hydrogen spectrum（1H NMR）. The maximum absorption of solution in chloroform in UV-Vis spectrum is located at 351 nm （E2 absorption band）. The E2 band occurs about a 51 nm red-shift in contrast to that of poly（paraphenylene） （PPP）. The peak of photoluminescence of DHO-PPP solution in chloroform is located at 423.8 nm and shows very high photoluminescence intensity because of the long side chain. The thermal properties and crystallinity of DHO-PPP have also studied by TGA, DSC and XRD.