《Interplay of Composition, pH, and Temperature on the Conformation of Multi-stimulus-responsive Copolymer Brushes: Comparison of Experiment and Theory》 was published in Langmuir in 2020. These research results belong to Johnson, Edwin C.; Willott, Joshua D.; de Vos, Wiebe M.; Wanless, Erica J.; Webber, Grant B.. Related Products of 7789-45-9 The article mentions the following:
Poly(2-(2-methoxyethoxy) Et methacrylate) (PMEO2MA), a thermoresponsive polymer with a lower critical solution temperature of ∼28°C, and poly(2-(diethylamino)ethyl methacrylate) (PDEA), a weak polybase with an apparent pKa of ∼7.5, were statistically copolymerized using ARGET ATRP to form multi-stimulus responsive polymer brushes. The stimulus responsive behavior of these brushes has been investigated with ellipsometry and numerical SCF (nSCF) theory. The pH and thermoresponsive behavior of a PDEA homopolymer brush was investigated exptl. in order to benchmark the nSCF theory calculations nSCF theory was able to reproduce the responsive behavior of PDEA and PMEO2MA homopolymer brushes. Three copolymer compositions (90:10, 70:30, 50:50 mol% MEO2MA:DEA) were investigated exptl. with pH ramps performed at low and high temperatures and temperature ramps performed at low and high pH. A broader range of compositions were investigated with nSCF theory and compared to the exptl. results, with the nSCF calculations able to capture the general behavior of the homopolymer and copolymer brushes. The responsive behavior of each brush to a given stimulus (temperature or pH) was dependent on both the polymer composition and environment (temperature or pH). The influence of pH on the brush increased with higher DEA mol% with copolymer brush response transitioning from temperature dominant to pH dominant. The temperature response of PMEO2MA was completely masked at low and high pH values by the presence of at least 30 mol% of polybase in the copolymer. In the experiment, the researchers used Cupric bromide(cas: 7789-45-9Related Products of 7789-45-9)
Some reported applications of Cupric bromide(cas: 7789-45-9) are: catalyst in cross coupling reactions; co-catalyst in Sonogashira coupling; lewis acid in enantioselective addition of alkynes.Related Products of 7789-45-9
Referemce:
Copper catalysis in organic synthesis – NCBI,
Special Issue “Fundamentals and Applications of Copper-Based Catalysts”