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The core-shell polyelectrolyte complexes chitosan (CS)/hyaluronic acid (HA) nanofibers could be produced from electric field inducing phase separation during the progress of electrospinning. The morphology of core-shell nanofibers was supported using scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The presence of CS on the shell of the nanofibers was also verified by...
Well-defined coil-helical polyethylene-b-poly(γ-benzyl-l-glutamate) diblock copolymers (PE-b-PBLG) were synthesized by a tandem synthetic strategy combining living polymerization of ethylene and ring-opening polymerization of γ-benzyl-l-glutamate-N-carboxyanhydride (BLG-NCA). Narrowly dispersed hydroxyl-terminated polyethylenes (PE–OH) with high branching density were synthesized by living polymerization...
The influence of aliphatic acids on the phase transition temperature of thermoresponsive hyperbranched polyethylenimine possessing a large amount of isobutyramide and amine groups (HPEI-IBAm) was studied systematically. Nine saturated aliphatic acids including formic acid (C1), acetic acid (C2), n-pentanoic acid (n-C5), trimethylacetic acid (t-C5), hexanoic acid (C6), octanoic acid (C8), decanoic...
Main chain and segmental dynamics of polyisoprene (PI) and poly(methyl methacrylate) (PMMA) chains in semi IPNs were systematically studied over a wide range of temperatures (above and below T g of both polymers) as a function of composition, crosslink density, and molecular weight. The immiscible polymers retained most of its characteristic molecular motion; however, the semi IPN synthesis...
It has been found that phase separation between polymer binder and small molecular plasticizer has an important effect on the properties of nitrate ester plasticized polyether (NEPE) propellants. However, the phase separation mechanism and factors of influencing the phase separation have not been clarified yet. To shed some light on this issue, a simple and novel method, that is Dissipative Particle...
To improve the accuracy of polymer interfacial tension measurement using deformed drop retraction method (DDRM), we examined some factors, such as the shape parameter, the retraction scale D 0 , and the distortion criterion γ by means of dissipative particle dynamics (DPD) simulation with 6 different models and analysis with three observation data, and proposing a new shape parameter P. Results...
The process experimentally measuring the interfacial tension of polymers was simulated by means of dissipative particle dynamics (DPD) simulation method in the present study. It is a retraction of ellipsoid drop of a polymer within the other polymer bulk. Effect of the initial geometry of the ellipsoid on the finally obtained interfacial tension was focused, since it was found the ellipsoid might...
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