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Star homopolymers of some vinyl monomers such as methyl methacrylate, n‐butyl methacrylate and styrene (MMA, nBMA, St.) were prepared by using a N,N,N′N′‐tetramethylethylenediamine ligand/CuBr catalytic system via atom transfer radical polymerization (ATRP). A three armed benzene based core was successfully used as initiator. Low polydispersities and regular molecular weight values were obtained in most cases, especially at low conversions. MMA and BMA showed comparable behavior where controlled and true ATRP was observed even at high conversions. However, styrene monomer recorded irregular high polydispersities at high conversions in spite of the relatively low molecular weight values. Some block copolymers were obtained using MMA homopolymer as macroinitiator with the same strategy of ATRP. 1H‐NMR confirmed the structures of the resulting polymers. Transmission electron microscopy (TEM) proved the nano‐structure of the star polymers. The thermal behavior of the MMA star homo and copolymers was studied. The effect of the star shape on thermal behavior was very clear with respect to the linear ones. 相似文献
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Ahsen Sare Yalın Buse Sündü Melek Sermin Özer Ayoub Abdelkader Mekkaoui Soufiane El Houssame Önder Metin 《应用有机金属化学》2023,37(1):e6943
A facile wet-chemical protocol for the synthesis of bimetallic CuPd alloy nanoparticles (NPs) anchored on mesoporous graphitic carbon nitride (m-gCN), serving as both stabilizer and support material, was presented herein. The presented protocol allowed to synthesize nearly monodisperse CuPd alloy NPs with an average particle size of 3.9 ± 0.9 nm without use of any additional surfactants and to prepare CuPd/m-gCN nanocatalysts with different Cu/Pd compositions (Cu25Pd75/m-gCN, Cu35Pd65/m-gCN, Cu16Pd74/m-gCN, Cu32Pd68/m-gCN, Cu10Pd90/m-gCN, and Cu50Pd50/m-gCN). After the detailed characterization of CuPd/m-gCN nanocatalysts, they were utilized as catalysts in the dehydrogenation of terpenes. Among all tested nanocatalysts, Cu50Pd50/m-gCN showed the highest activity in terms of the product yields within the same reaction time. Various parameters influencing the catalytic activity of Cu50Pd50/m-gCN were studied using himachalene as a model substrate and the optimum conditions were determined. Under the optimized reaction conditions, the catalytic application of Cu50Pd50/m-gCN nanocatalysts was extended to nine different terpenes and the corresponding products were obtained in high conversion yields (>90%) under mild conditions. A reusability test showed that Cu50Pd50/m-gCN nanocatalysts can be re-used up to four cycles without significant loss in their initial activity. 相似文献