Improving Brush Polymer Infrared One-Dimensional Photonic Crystals via Linear Polymer Additives

Abstract

Materials:Unless otherwise noted, all solvents and reagents were purchased from VWR or Sigma-Aldrich.The ruthenium-based metathesis catalyst was obtained from Materia Inc. and stored in a drybox prior to use, and the RuO4 SEM staining agent was obtained from Polysciences, Inc and stored at 4 ºC. The ruthenium metathesis catalyst ((H2IMes)(pyr)2(Cl)2RuCHPh) and PLA macromonomer initiator (N-(hydroxyethanyl)-cis-5-norbornene-exo-2,3-dicarboximide) were prepared as described previously (1). Dry solvents were purified by passing them through solvent purification columns, and 3,6-dimethyl-1,4-dioxane-2,5-dione was purified by sublimation under vacuum. All other solvents and chemicals were used without further purification unless otherwise noted. General Information:NMR spectra were recorded at room temperature on a Varian Inova 500 (at 500 MHz), and analyzed on MestReNova software. Gel permeation chromatography (GPC) was carried out in THF on two Plgel 10 μm mixed-B LS columns (Polymer Laboratories) connected in series with a miniDAWN TREOS multiangle laser light scattering (MALLS) detector, a ViscoStar viscometer and Optilab rex differential refractometer (all from Wyatt Technology). The dn/dc values used for the polylactide and polystyrene macromonomers were 0.050 and 0.180 respectively, and dn/dc values for the brush polymers and random copolymers were obtained for each injection by assuming 100% mass elution from the columns. SEM images were taken on a ZEISS 1550 VP

Photonic water dynamically responsive to external stimuli

“…3c)15161718192021222324252627. Although photonic materials capable of reflecting near-infrared radiation are indispensable for modern telecommunications systems, such materials are difficult to synthesize22. According to Bragg's law, a reflection wavelength of 1,750 nm (Fig.…”

Well-Defined Polyethylene-Based Random, Block, and Bilayered Molecular Cobrushes

“…For example, photocrystals were generated through the bottom-up self-assembly of diblock molecular cobrushes resulting in colorful films with tunable bandgaps. [6][7][8]11 Organo-nanotubes have also been fabricated from the layered molecular cobrushes. 15,16 Similarly to homomolecular brushes, there are three strategies giving access to well-defined molecular cobrushes, i.e., (i) "grafting from", growing two or more chemically different side branches from a polymeric backbone (multifunctional initiator) through independent living or controlled/living polymerization processes; 16−18 (ii) "grafting onto", coupling the different types of branches to a polymeric chain through highly efficient and independent coupling reactions; 19 and (iii) "grafting through", also known as macromonomer strategy, polymerizing two or more different macromonomers through living or controlled/living polymerization techniques.…”

Block Copolymer Nanocomposites with High Refractive Index Contrast for One-Step Photonics

“…[46][47][48][49][50][51][52]55,58 The BBCPs are well-defined (polynorbornene-graft-poly(tert-butyl acrylate))-block-(polynorbornene-graft-poly(ethylene oxide)) BCPs ((PNB-PtBA 8.2k ) n -b-(PNB-PEO 5k ) m ) synthesized by sequential ring-opening metathesis polymerization (ROMP). The detailed synthetic procedures were reported in our recent publication.…”