芘基官能化的聚（异丁烯的光物理ALT -马来酸酐）和聚（异丁烯ALT -马来Ñ -alkylimide）。溶剂，取代度和温度的影响,Macromolecules

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芘基官能化的聚（异丁烯的光物理ALT -马来酸酐）和聚（异丁烯ALT -马来Ñ -alkylimide）。溶剂，取代度和温度的影响
Macromolecules ( IF 5.1 ) Pub Date : 2017-03-02 00:00:00 , DOI: 10.1021/acs.macromol.6b02434
Mei-Jin Li ₁ , Michael J. Bertocchi , Richard G. Weiss

Affiliation

一系列聚合物的衍生自聚（异丁烯ALT -马来酸酐）（PIMA）用约合成并表征了1％至> 90％的无规被1-苯甲基甲基亚氨基（Py-PIMA）取代的酸酐单元。Py-PIMA中具有10％pyr烯取代基的其余酸酐单元已转化为N-己基和N-癸酰亚胺。从稳态荧光强度，时间相关的单光子计数实验和时间分辨的发射光谱获得的这些聚合物的光物理性质，为深入了解聚合物构象的依赖性及其对of烯取代度的不稳定性提供了见解。，附加烷基链的性质，温度和溶剂性质（取决于弗洛里相互作用系数和汉森溶解度参数）。溶剂特性不能单独解释聚合物行为的所有方面。介质与聚合物链的相互作用以及the烯单元的激发单线态必须有所不同。

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Photophysics of Pyrenyl-Functionalized Poly(isobutylene-alt-maleic anhydride) and Poly(isobutylene-alt-maleic N-alkylimide). Influence of Solvent, Degree of Substitution, and Temperature

A series of polymers derived from poly(isobutylene-alt-maleic anhydride) (PIMA) with ca. 1% to >90% of the anhydride units randomly substituted with 1-pyrenylmethylimido groups (Py-PIMA) has been synthesized and characterized. The remaining anhydride units in the Py-PIMA with 10% pyrenyl substitution have been converted to N-hexyl and N-decyl imides. The photophysical properties of these polymers, as obtained from steady-state fluorescence intensities, time-correlated single photon counting experiments, and time-resolved emission spectra, have provided insights into the dependence of the polymer conformations and their labilities on the degree of pyrenyl substitution, the nature of the appended alkyl chains, temperature, and solvent properties according to the Flory interaction coefficient and Hansen solubility parameters. None of the solvent characteristics, alone, can account for all aspects of the polymer behavior. The interactions of the medium with the polymer chains and the excited singlet states of the pyrenyl units must be considered somewhat differently. The results also indicate that PIMA is a potentially very useful and versatile platform for other investigations of polymer chain and probe dynamics.

更新日期：2017-03-02

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