烷氧基对聚对苯撑发光性能的影响

EFFECT OF ALKOXYL ON PHOTOLUMINESCENT PROPERTY OF POLYPHENYLENE

:采用 Scholl反应 ,以硝基苯作溶剂 ,无水三氯化铁为催化剂 ,合成了系列可溶性烷氧基对称二取代的聚对苯撑 (DAO- PPP) ,并用多种手段对其结构进行了表征 ,研究了聚合物的光致发光性能。实验表明 ,烷氧基的引入不但明显改善了 PPP的溶解加工性能 ,而且随烷氧基侧链链长的改变 ,聚合物的最大紫外吸收峰、带隙 Eg、光致发光(PL)最大发射峰及其发射强度都呈现规律性的变化 。

A series of dialkoxyl substituted poly(para phenylene)(DAO PPP), which are soluble in common organic solvents, were synthesized by Scholl reaction using anhydrous FeCl 3 as catalyst and nitrobenzene as solvent. Their structures were characterized by FT IR, 1H NMR, elemental anslysis, etc. and phogtoluminescent properties were studies. The experimental results show that an introduction of alkoxyl side chains not only improves solubility of polymers in organic solvents, but also effectes the optical properties including UV Vis absorption peaks band gaps, maximum photoluminescent peaks. The dependence of their properties on the side chain length has been explained in terms of the steric hindrance effect and donor ability of the alkoxyl groups.