Experimental Formulation of Photonic Crystal Properties for Hierarchically Self-Assembled POSS–Bottlebrush Block Copolymers

Abstract

Aminopropyi-heptasobutyl POSS (NH 2 C 3 H 6 POSS) was purchased from Hybrid Plastics. All other materials were purchased from available suppliers (Sigma-Aldrich, TCI, Fisher Scientific, etc.) and used without further purification unless otherwise noted. Tetrahydrofuran (THF) was distilled over sodium naphthalenide and degassed at 10 −6 Torr. Hexane was distilled over 1,1diphenylhexyllithium and degassed at 10 −6 Torr. Lithium chloride (LiCl) was dried with stirring at 150 °C for 24 h at 10 −6 Torr. A 1.4 M sec-butyllithium (s-BuLi) solution in cyclohexane was degassed, appropriately diluted in hexane, divided into clean glass ampules equipped with breakseals at 10 −6 Torr, and stored at −30 °C. 1,1-Diphenylethylene (DPE) and benzyl methacrylate (BzMA) were distilled over calcium hydride (CaH 2 ) at reduced pressure and then redistilled over CaH 2 at 10 −6 Torr. DPE, LiCl, and BzMA were appropriately diluted in THF, divided into clean glass ampules equipped with break-seals at 10 −6 Torr, and stored at −30 °C. A Grubbs third generation catalyst, Ph-CH=Ru(Cl) 2 (H 2 IMes)(pyridine) 2 (G3), was prepared according to a previously reported procedure. S1 S.1.2. Instruments and Analyses.Proton and carbon-13 nuclear magnetic resonance ( 1 H and 13 C NMR) spectra were recorded using a JNM-ECX 400 NMR spectrometer (JEOL) in chloroform-d (CDCl 3 , 99.8% atom D, contains 0.03 vol% tetramethylsilane (TMS)) at 25 °C. Number-average molecular weight (M n ) and dispersity (Ɖ) values of the polymers were measured using a size exclusion chromatographymultiangle laser light scattering (SEC-MALLS) equipped with a 515 HPLC pump (Waters), a set of four Styragel columns connected in series (HR 0.5, HR 1, HR 3, and HR 4 with pore sizes of

Application of olefin metathesis in the synthesis of functionalized polyhedral oligomeric silsesquioxanes (POSS) and POSS-containing polymeric materials

“…Lee has performed a series of sequential ring-opening metathesis copolymerization of norbornene- exo -2,3-dicarboximido)dodecanoylamino)propylheptaisobutyl-POSS and exo -5-norbornene-2-carbonyl-end poly(benzyl methacrylate, Scheme 30) [54] and obtained rodlike POSS−bottlebrush block copolymers containing crystalline POSS pendants in one block and amorphous polymeric grafts in another block. Hierarchical self-assembly of rodlike copolymer was studied from the point of view of its utility in producing highly ordered 1D photonic crystals.…”

Copolymer Particles with Incorporated Gold and Silver Nanoparticles to Absorb Short‐Wavelength Scattering in Full‐Color Photonic Glasses

“…There are two types of structural color materials: photonic crystals (PCs) and photonic glasses (PGs). PCs are nanostructures composed of two materials with a different refractive index that are periodically arranged with long‐range order . A color reflected from PCs is iridescent, and the color changes depending on the viewing angle .…”

Stretchable Conductive Hybrid Films Consisting of Cubic Silsesquioxane-capped Polyurethane and Poly(3-hexylthiophene)

“…Polyhedral oligomeric silsesquioxane (POSS) has attracted greater interest as an “element-block”, which is a minimum functional unit containing various types of elements, for obtaining hybrid materials simply by mixing [49,50]. POSS has high chemical and thermal stability, bulky and rigid hydrophobic space and high designability according to its unique structure [51,52,53,54,55,56,57,58,59,60,61,62]. For example, simple loading of POSS onto polymers with or without covalent bonding reinforces thermal stability and rigidity [63].…”