Fluorescence probe studies on the complexation between poly(methacrylic acid) and poly(N, N-diethylacrylamide)
- 作者：Liu ; Shouxin ; Fang ; Yu ; Gao ; Gailing ; Liu ; Mingzhu ; Hu ; Daodao
- 关键词：Poly(methacrylic acid) ; Poly(N ; N-diethylacrylamide) ; Complexation ; Conformation ; Fluorescence probe
- 刊名：Spectrochimica Acta Part A ; Molecular and Biomolecular Spectroscopy
- 出版年：2005
- 期刊代码：99_13861425
- 类别：ch
- 出版时间：March, 2005
- 卷：61
- 期：5
- 页码：887-892
- 文件大小：107 K
摘要
The complexation between poly(methacrylic acid) (PMAA) and poly(N, N-diethylacrylamide) (PDEAM) in aqueous phase was studied by UV–vis and fluorescence probe techniques. It was demonstrated that the complexation of PMAA with PDEAM occurs within a pH range of 1–6.5 and along with the complexation, the conformation of PMAA changed from a hypercoiled to a loose coiled form. The complex ratio between the two polymers is 1:1 (PMAA:PDEAM, in monomer unit). Salt effect studies showed that the complexation occurred due to formation of hydrogen bonds between the two polymers. Based upon these conclusions and the “compact micelle-like structure” for PMAA at low pH, a “ladder” model was proposed for the structure of PMAA–PDEAM complex formed at low pH.