The evaluation of molecular weight of polymers with the terminated boron dipyrromethene using end-group analysis
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The molecular weight of a polymer plays an important role in studying its physical and chemical properties; thus, it is necessary to evaluate molecular weight before carrying out the following experiment process. Herein, three different polymers, poly(N-isopropyl acrylamide) (PNIPAM), poly(2-(dimethylamino)ethyl methacrylate) (PDMAEMA) and poly(2-O-methacryloyloxyethyl-(2,3,4,6-tetra-O-acetyl-b-d-galactopyranoside)) (PAcGEMA), with the terminated Boron dipyrromethene (BODIPY) were synthesized. And gel permeation chromatography (GPC) and proton nuclear magnetic resonance (1H NMR) techniques were used to determine their molecular weight. Subsequently, end-group analysis method was used to determine molecular weight. The results showed that molecular weight measured by end-group analysis has similar values to that by GPC and NMR. Further, an amphiphilic copolymer of poly(AAPBA-b-GAMA) was synthesized, which was only dissolved in DMSO/H2O or DMF/H2O-mixed solvents and difficult to obtain molecular weight value by GPC or 1H NMR technology. Thus, its molecular weight was evaluated using end-group analysis method. These result implied that end-group analysis method has the potential to estimate molecular weight of polymers with the terminated BODIPY.
KeywordsBoron dipyrromethene End-group analysis Molecular weight
This work was supported by the Guizhou Provincial Department of Education Youth Science and Technology Talent Development Project (Grant no. 150), the National Natural Science Foundation of China (Grant no. 81860701), the Green Chemistry and Resources and Environment Innovation Team Program of Guizhou Ordinary Colleges and Universities (Grant no. 62).
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Conflict of interest
We declare that we have no conflict of interest.
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