Polydibenzothiophene: Effect of molecular weight on photoelectric performance

Lin, Kaiwen; Ming, Shouli; Chen, Shuai; Zhang, Xiaobin; Wang, Ke; Wang, Yuehui; Xu, Jingkun

doi:10.1016/j.synthmet.2020.116319

Cited by 1 publication

(1 citation statement)

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“…The molecular weight of polymers has a profound impact on their functional performance, physical properties, and processing characteristics. − Characterizing the molecular weight provides valuable insights into the properties of polymers. , In the case of conventional polymers, gel permeation chromatography is commonly used to directly measure molecular weight with precision , However, this method is not suitable for supramolecular polymers, which are a distinct type of polymer formed through noncovalent interactions. − Unlike covalent polymers, supramolecular polymers exhibit dynamic behavior, and their formation is highly dependent on concentration. − Supramolecular polymers exhibit a dynamic nature attributed to the presence of noncovalent interactions, which play a pivotal role in their assembly from monomeric units. Consequently, the formation of supramolecular polymers is highly dependent on concentration. − At lower concentrations, cyclic assemblies or oligomers prevail as the predominant species, while supramolecular polymers emerge at higher concentrations.…”

Section: Introductionmentioning

confidence: 99%

Fluorescence Lifetime-Based Characterization for Supramolecular Polymer Molecular Weight

Liu,

Hu,

et al. 2023

Macromolecules

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The determination of molecular weight is crucial for understanding the properties of supramolecular polymers, but it poses challenges due to their concentration-dependent dynamic behavior. In this study, a specific viscosity-fluorescence lifetime technique was employed using 4,4′-difluoro-4-bora-3a,4adiaza-sindacene (BODIPY-C12a) as a molecular weight probe. At lower concentrations, supramolecular polymers existed as short chains, gradually elongating with increasing monomer concentration, indicating higher molecular weights. The viscosity of the system correlated with the molecular weight. Incorporating BODIPY-C12a, which is sensitive to viscosity, exhibited distinct changes in fluorescence lifetime due to the restriction of phenyl ring rotation at higher concentrations. By analyzing fluorescence lifetime, molecular weight could be determined. Furthermore, trifluoroacetic acid disrupted quadruple hydrogen bonding, leading to supramolecular polymer disassembly and a decrease in fluorescence lifetime.

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