Development of dendrimers: Macromolecules for use in organic light-emitting diodes and solar cells
Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford OX1 3TA, United Kingdom.Chemical Reviews (Impact Factor: 45.66). 05/2007; 107(4):1097-116. DOI: 10.1021/cr050136l
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03/2014; 2014(4):67. DOI:10.3998/ark.5550190.p008.375
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ABSTRACT: A highly efficient strategy for synthesizing the first biocompatible polyesters with ALE characteristics has been established via immortal ring-opening polymerizations of cyclic esters bearing nonluminophores. In the process, the large excess hydroxyl-modified ATE active compound, acting as the chain transfer agent, attaches to the active rare-earth metal catalyst via the rapid-reversible exchange reaction to initiate the polymerization. Thus, more polyester chains appear to grow from one active metal species, and the AIE fragments are incorporated into the polymer chains at specific sites, in situ. The resultant polyesters have linear, block, or star-shaped microstructures mimicking those of the modified ATE compounds. The polymerization solutions can be directly fabricated to large-area thin solid films. The obtained PLA, for instance, emits fluorescence in water/THF mixtures owing to aggregation, the intensity of which is 2850-fold stronger than that in THF solution. This strategy avoids complicated preparation of ATE-active monomers and/or usage of toxic metal reagents for catalyzing the coupling reactions in order to introduce ALE-active fragments, which provides a straightforward approach to access ATE active or other functional polymers from hardly modified monomers.Macromolecules 08/2014; 47(16):5586-5594. DOI:10.1021/ma500985j · 5.93 Impact Factor
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ABSTRACT: The novel cellulose resin crosslinked with perylene tetracarboxylic diimides 3 was synthesized and its structure was characterized by elemental analysis, Fourier transform infrared (FTIR) spectroscopy, and scanning electronmicroscopy (SEM), etc. Dyes adsorption experiments of polymer 3 suggested that it exhibited excellent adsorption capacities for tested four cationic and anionic dyes [Orange G sodium salt (OG), Brilliant ponceau 5R (BP), Methylene blue (MB), and Crystal violet (CV)]. The adsorption capacities for OG, BP, MB, CV were as high as 1.04, 1.21, 1.14, and 0.96 mmol/g, respectively. The adsorption processes obeyed the pseudo second-order model and followed the Langmuir isotherm equation. The adsorption processes were exothermic and spontaneous. The pH = 2 similar to 12 made slight influences on adsorption capacities of polymer 3 for dyes. It was supposed that the adsorption mechanism was not only the electrostatic forces and hydrogen bond but also the pi-pi stacking interaction playing an important role in the adsorption processes.Separation Science and Technology 10/2014; 49(16):2548-2556. DOI:10.1080/01496395.2014.928891 · 1.20 Impact Factor
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