A series of multistage (pressure-sensitive/hot melt) adhesives utilizing dynamic thia-Michael bonding motifs are reported. The benzalcyanoacetate Michael acceptors used in this work undergo bond exchange under ambient conditions without external catalysis, facilitating pressure-sensitive adhesion. key feature system is the reaction-induced phase separation that lends reinforcement to otherwise weakly bonded materials, enabling weak, repeatable adhesion and strong when processed as a hot melt...

Hierarchical structure-within-structure assemblies offer a route toward increasingly complex and multifunctional materials while pushing the limits of block copolymer self-assembly. We present detailed study self-assembly series fluorinated high-χ copolymers (BCPs) prepared via postmodification single poly(styrene)-block-poly(glycidyl methacrylate) (S-b-G) parent polymer with alkylthiol pendent groups containing 1, 6, or 8 carbons (termed trifluoro-ethanethiol (TFET), perfluoro-octylthiol...

As a platform for investigating two-dimensional phase separation, we track the structural evolution of block copolymer thin films during thermal annealing with environmentally controlled atomic force microscopy (AFM). Upon annealing, incommensurate thickness separate into terraced morphology decorated holes. With in situ imaging at 200 °C, follow continuous progression terrace formation single region cylinder-forming poly(styrene-block-methyl methacrylate) film, beginning disordered on an...

Density functional theory (DFT) and coupled cluster (CCSD(T)) were used to study the addition of CO2 group 4 (MO2)n 6 (MO3)n (n = 1, 2, 3) nanoclusters. The structures energetics arising from Lewis acid-base (physisorption) formation CO32- (chemisorption) these clusters predicted. Physisorption chemisorption are predicted be thermodynamically allowed for clusters, with being more favored energetically. Correlations ligand binding energies (LBEs) made fluoride affinities M-O M═O bond...

Blending block copolymers (BCP) with additives is a useful approach for controlling BCP morphology and properties. In athermal systems, blends of BCPs polymer having very high molecular (Mn) mass generally result in macrophase separation. Bottlebrush polymers, which consist linear backbone grafted side chains, present an interesting alternative where the overall Mn system can be large but low chains may drive miscibility BCP. this study, bottlebrush polynorbornene polystyrene (PS) blended...

Using environmentally controlled, high-speed atomic force microscopy (AFM), we examine dynamic fluctuations of topographically confined poly(styrene-block-methyl methacrylate) (PS-b-PMMA) cylinders. During thermal annealing, drive perturbations the block copolymer (BCP) interface between polymer domains, leading to pattern roughness. Whereas previous investigations have examined roughness in room-temperature and kinetically quenched samples, directly visualize dynamics PS/PMMA interfaces...

The addition of NO2 to Group IV (MO2)n and VI (MO3)n (n = 1-3) nanoclusters was studied using both density functional theory (DFT) coupled cluster (CCSD(T)). structures overall binding energetics were predicted for Lewis acid-base without transfer spin (a physisorption-type process) the formation either cluster-ONO (HONO-like or bidentate bonding) NO3- where is transferred metal oxide clusters chemisorption-type process). Only chemisorption be thermodynamically allowed at temperatures ≥298 K...

Abstract Since its development, atomic force microscopy (AFM) has become an indispensable tool for investigating fundamental and technological applications of polymer materials. The versatility AFM imaging modes operating conditions allows nanoscale characterization a range dynamic processes, such as crystallization, phase separation, self assembly, electronic transport. Advances in technology, particularly high‐speed high‐resolution imaging, enable investigation structure, function,...

Adsorption of CO2 to uranium oxide, (UO3)n, clusters was modeled using density functional theory (DFT) and coupled cluster (CCSD(T)). Geometries reaction energies were predicted for carbonate formation (chemisorption) Lewis acid-base addition (physisorption) these (UO3)n clusters. Chemisorption multiple moieties also dimer trimer Physisorption chemisorption both be thermodynamically allowed clusters, with being more favorable than physisorption. The most energetically favored (UO3)3(CO2)m...

The application of block copolymer (BCP) templates for nanofabrication is currently limited by structural disorder the nanoscale pattern. To study pattern fluctuations and defects, we apply high-speed atomic force microscopy to track dynamics confined poly(styrene-block-methyl methacrylate) cylinders during in situ thermal annealing. For this investigation, use wedge-shaped trenches as a controlled platform systematically examining effects strain defectivity. By mapping spatial distribution...

Fundamental studies are needed to advance our understanding of selective adsorption in aqueous environments and develop more effective sorbents filters for water treatment. Vapor-phase grafting functional silanes is an method prepare well-defined surfaces study adsorption. In this investigation, we perform vapor phase five different silane compounds on aluminum oxide (Al2O3) prepared by atomic layer deposition. These have the general formula L3Si–C3H6–X where ligand, L, controls reactivity...

A pilot-scale evaluation to assess the application of direct current a rapid sand filter (termed "electrofiltration") verified theoretical effectiveness electrofiltration in enhancing performance conventional filtration within water treatment facility. The efforts which are described this paper were based on prior bench-scale assessments process. analysis, combined with theory used describe phenomenon, was design and construct pilot using from existing filters plant. tested effluent...