《Molecular Parameters Governing the Elastic Properties of Brush Particle Films》 was written by Lee, Jaejun; Wang, Zongyu; Zhang, Jianan; Yan, Jiajun; Deng, Tingwei; Zhao, Yuqi; Matyjaszewski, Krzysztof; Bockstaller, Michael R.. Product Details of 7789-45-9 And the article was included in Macromolecules (Washington, DC, United States) in 2020. The article conveys some information:
Elucidation of the mutual influence of composition and architecture of polymer canopies on the assembly and mech. properties of brush particle-based materials holds the promise of advancing the understanding of the governing parameters controlling interactions in hybrid materials and the development of novel functional materials. In this work, the elastic properties of three series of brush particle systems were investigated, differentiated by grafting d. as dense, intermediate, and sparse brush systems. Dense and intermediate systems displayed uniform microstructures; the degree of order (measured using Voronoi cell area anal.) increased with grafting d. For dense and intermediate brush particle systems, instrumented indentation anal. revealed an increase of the elastic modulus with the d.p. of tethered chains, in contrast to effective medium predictions. Furthermore, the contribution of ligands to particle interactions increased with decreasing grafting d. The results indicated that the response behavior of particle brush films in tensile-type deformations depends on dispersion interactions between ligands of adjacent brush particles. The more pronounced brush interdigitation in the case of intermediate graft densities enhanced the dispersion interactions between brush particles and hence the modulus of films. A reversed trend in modulus was observed in films of sparse brush particles that also featured the formation of string-like superstructures. Here, the elastic modulus was substantially increased for low-mol. ligands and continuously decreased with increasing d.p. of tethered chains along with a transition from string-like to uniform morphologies. Independent of grafting d., the elastic modulus of the pristine polymer was recovered in the limit of a high d.p. of polymer ligands.Cupric bromide(cas: 7789-45-9Product Details of 7789-45-9) was used in this study.
Cupric bromide(cas: 7789-45-9) can be used as reducing agent, when complexed by three molecules of pyridine initiators for the controlled polymerization of styrene, methyl acrylate and methyl methacrylate.Product Details of 7789-45-9
Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”