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The room-temperature solvent vapor annealing of polystyrene-b-polydimethylsiloxane (PS-b-PDMS) block copolymer films was studied in situ by grazing incidence small-angle X-ray scattering. Films of cylinder-forming PS-b-PDMS with molecular weight 16 kg/mol and 12.2 kg/mol, annealed under vapors of toluene:heptane with varying composition, exhibited swelling-ratio-dependent evolution of microdomain...
Micro-morphology control of films is fundamental to adapt a particular material for their final application. The strategy depicted in this study permits the spontaneous formation of corrugated patterns using a two-step procedure involving an initial thermal pre-polymerization followed by UV exposure. Two deposition methods, electrospray and spin coating were explored; interestingly, spin coating forms...
Spiropyran-containing polymer nanoparticles have found interesting applications in various fields. Here, redispersible multi-responsive latex nanoparticles have been prepared by using RAFT-mediated polymerization. Poly (dimethylamino ethyl methacrylate (DMAEMA)-b-methyl methacrylate (MMA)) was used as a pH-responsive reactive macro-RAFT surfactant (MRS) with molecular weight of 3390 g mol−1. Afterwards,...
A new diselenide crosslinked polyurethane nanogel was developed, which could respond to pH change and oxidaiton condition. Firstly, PEGylated polyurethane (MPEG-PUBM-MPEG) containing tertiary amino and Br groups was prepared, which can assemble into micelles in aqueous solution. Then the nanogels with diselenides crosslinked polyurethane (PU) core and hydrophilic PEG shell were prepared using sodium...
A series of hybrid microporous polymers (HMPs) were prepared through Friedel-Crafts reaction with double-decker-shaped silsesquioxane as the building block. The ratio between the monomer and the crosslinker has significant influence on the surface area and porous morphology. A maximum BET surface area of 923 m2 g−1 and high gas storage capacity (CO2:10.4 wt%, 273 K/1.0 bar; H2: 0.95 wt%, 77 K/1.0 bar)...
The biaxial stretching behavior of polyamides 6 and 11 has been investigated in relation to the organization of H bonds within their crystalline structure. Contrary to the case of mesophases, the H-bonded sheet-like structures of both PA6 and PA11 display poor ability for biaxial orientation due to their strong mechanical anisotropy. It is shown that the occurrence of a Brill transition has a dramatic...
We report herein the effects of solvent, concentration, and molecular weight of α-alkynyl-ω-azido polystyrenes (l-PS-N3) on the synthesis of monocyclic polystyrenes (c-PS) by intra-chain coupling of l-PS-N3 via Cu-catalyzed azide/alkyne cycloaddition method. By using fully end-functionalized l-PS-N3 as precursors, the optimum cyclization conditions to synthesize high purity c-PS (>99% by SEC) are...
Nanofibers were prepared from water-extractable melt-blown immiscible polymer blends containing a commercial sulfopolyester (SP) as the sacrificial phase. Application of the water-dispersible SP eliminates issues associated with organic solvents, providing a facile, economic, and environment-friendly approach to high throughput fabrication of melt-blown nanofibers with an average diameter as small...
We reported the first Monte Carlo study of incompressible symmetric binary homopolymer blends. Using fast lattice Monte Carlo simulations (Q. Wang, Soft Matter 5 (2009) 4564–4567) in a semi-grand-canonical ensemble with the cooperative motion algorithm generalized in our previous work (P. Zhang, Q. Wang, J. Phys. Chem. B 118 (2014) 12059–12067) and the finite-size scaling theory, we studied the critical...
Crosslinked polymeric networks have been utilized as effective building blocks for the development of a variety of multifunctional materials in materials science, nanoscience, and industrial fields. Here, we report thiol-ene polysulfide-crosslinked polymethacrylate networks reinforced with aluminum oxide nanoparticles (ALNPs) prepared by photo-induced thiol-ene radical addition for reactive blends...
In a previous study, we demonstrated the feasibility of retaining poly(N-isopropylacrylamide) (pNIPAAm) on hydroxylated surfaces by spin-coating a blend of pNIPAAm with a small amount of 3-aminopropyltriethoxysilane (APTES), an organosilane, followed by thermal annealing. In this study, we detail the conditions for retaining pNIPAAm films by APTES. Our results show that the difference in surface energy...
Based on a model amidation reaction of benzoic acid triethylene glycol (TEG) ester with lithium anilide, which proceeded as rapidly as that of the methyl ester and faster than that of the ethyl ester, we considered that a TEG ester AB2 monomer would have sufficient reactivity to undergo chain-growth condensation polymerization. Indeed, condensation polymerization of 5-(methylamino)isophthalic acid...
Cellulose nanocrystals (CNC) were modified via surface grafting of (2-Dodecen-1-yl) succinic anhydride (DDSA) in dimethylformamide (DMF). The resulting DDSA-CNC exhibits good dispersibility in organic solvents with a wide range of polarity. In nanocomposite applications, DDSA-CNC can improve both the dispersion of the nanoparticles in the matrix material as well as the interface between them. For...
Using a combination of modeling and experiments, we show that miktoarm star macromolecules act as molecular/mechanical linkers in the fabrication of multilayer stackable gels, which are formed by sequential controlled radical polymerization of successive layers in incompatible solvents. Dissipative particle dynamics simulations indicate that miktoarm star copolymers localize at the interface between...
The diffusion of polymer in long cylindrical tubes is investigated by using Monte Carlo simulations. Two kinds of cylindrical tubes are taken into account: (1) a homogeneous tube where the polymer-tube interaction is independent of monomer position along the longitudinal direction of the tube, and (2) a periodic one where the interaction is periodically changed along the tube. In the homogeneous tube,...
Facilitating the electric field to fabricate high performance polymer nanocomposites (PNCs) is always a great and promising strategy. In this work, the effect of the electric field on the conductive property of the PNCs is investigated by adopting coarse-grained molecular dynamics simulation. The translational and rotational diffusion of the nanorod gradually decreases with the increase of the nanorod...
Based on nonlinear viscoelastic theory and coupled thermo-mechanical approach, heat build-up analysis of a rubber specimen under cyclic loading was performed through finite element analysis. The determination of the rubber material properties attracted particular attention. The thermo-mechanical coupling approach can be divided into three major parts: deformation, dissipation, and thermal modules...
We adopt a multiscale scheme for constitutive modeling of a natural rubber (NR) with coarse-grained (CG) molecular dynamics (MD) simulations. The effective potentials of the CG model are constructed from several full-atomic models using inverse Boltzmann method (IBM) along with the pressure correction for non-bonded interaction. We simulate chains of the natural rubber at mesoscale with an experimental...
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