CHROMOPHORE H-AGGREGATION KINETICS OF A BRANCHED SIDE-CHAIN AZO POLYELECTROLYTE

LI Yaobang; DENG Yonghong; TONG Xiaolan; WANG Xiaogong

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CHROMOPHORE H-AGGREGATION KINETICS OF A BRANCHED SIDE-CHAIN AZO POLYELECTROLYTE

Research Article | 更新时间：2021-03-19

- CHROMOPHORE H-AGGREGATION KINETICS OF A BRANCHED SIDE-CHAIN AZO POLYELECTROLYTE
- Acta Polymerica Sinica Issue 6, Pages: 834-839(2005)
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- Published：20 December 2005，
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LI Yaobang, DENG Yonghong, TONG Xiaolan, WANG Xiaogong. CHROMOPHORE H-AGGREGATION KINETICS OF A BRANCHED SIDE-CHAIN AZO POLYELECTROLYTE. [J]. Acta Polymerica Sinica (6):834-839(2005)
DOI：

LI Yaobang, DENG Yonghong, TONG Xiaolan, WANG Xiaogong. CHROMOPHORE H-AGGREGATION KINETICS OF A BRANCHED SIDE-CHAIN AZO POLYELECTROLYTE. [J]. Acta Polymerica Sinica (6):834-839(2005) DOI：

摘要

利用偶氮聚电解质上的偶氮苯基团作为“探针”

研究了支化侧链偶氮聚电解质PMAPB6P-AA的偶氮生色团H-聚集动力学过程.研究发现

在不同THF/H2O配比情况下

H-聚集的速率有很大差别

THF比例越小

生色团发生H-聚集的速率越大

即偶氮聚电解质在溶剂体系中的疏水聚集对发生H-聚集有重要推动作用.通过测定偶氮聚电解质上的“孤立”生色团和H-聚集体的紫外光谱最大吸收值变化

表征了H-聚集过程的动力学

并分别用一级和二级动力学方程进行了拟合.结果表明

偶氮聚电解质的H-聚集过程具有二级动力学过程的特点.

Abstract

By using spectroscopic variation of azo chromophores in different states as a‘probe’

chmmophore H- aggregation kinetics of a branched side-chain azo polyelectrolyte PMAPB6 P-AA in THF/H2O solutions was studied．The THF/H2O ratio showed a significant effect on the H-aggregation rate．The H-aggregation rate increased as the H2O content increased It indicates that the hydrophobic effect is an important dfiven force in the process of H-aggregation．The kinetic process of the H-aggregation was characterized by the change of the UV-Vis absorption ratios of the‘isolated’ azo chromophores and H-aggregates．Two kinds of kinetic equations were used to fit the H- aggregation process The process can be well fitted by the second-order kinetic equation．

关键词

偶氮聚电解质偶氮生色团H-聚集支化侧链疏水作用动力学

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