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As a promising structural material, various tough hydrogels have been developed in recent years by incorporating different kinds of noncovalent bonds as the energy-dissipating segments. Among these systems, it is challenging to use hydrogen bonds due to their instability in aqueous environment. Here we report a tough hydrogel of poly(1-vinylimidazole-co-acrylic acid) (P(VI-co-AAc)) reinforced by the...
The modification of nanoparticles (NPs) with functional groups that render them much more compatible with the polymeric matrices to prepare organic-inorganic hybrid materials is an active area of research. In this work, flame retardant and reactive nanosilica particles were prepared. First, nanosilica particles were coated with aminosilane and then reacted with furfural to introduce Diels Alder clickable...
The present study consists of three parts: 1) synthesis of diphenyl sulfone dihalide monomers with different positions of pyridyl groups; 2) fundamental understanding of polymer chain growth (i.e., condensation) and scission (i.e., trans-etherification) involving use of the novel dihalides; and 3) general properties of the basic polymers prepared. The dihalides are 4,4′-difluorodiphenyl sulfone contained...
Extension induced crystallization of γ-irradiated isotactic polypropylene (γ-iPP) was studied with the combination of extensional rheology and in-situ wide-angle X-ray scattering (WAXS). The high gel content and markedly frequency-dependent storage modulus of γ-iPP indicates the occurrence of slight crosslinking accompanied by formation of free branching/dangling chains during irradiation. With WAXS,...
Generally, thermo-responsive hydrogels are prepared from thermo-responsive polymers like PNIPAM and its copolymers thereof. In this research, self-healable hydrogels with thermo-responsiveness and regulated cloud points (CPs) were prepared from water soluble P(N,N-dimethylacrylamide98-stat-diacetone acrylamide44) P(DMA98-stat-DAA44) through crosslinking induced thermo-responsiveness (CIT) mechanism...
Identification of precursor events related to incipient plastic deformation in polyethylene parts using a nondestructive technique is investigated in this study. A pair of ultrasonic transducers mounted on the surface of a test sample were used to propagate ultrasonic pulses of varying frequency while progressively small flexural deformations below yielding were applied. The evolution of higher order...
The axisymmetric instability, which has a potential to cause bead formation along the fibers produced by electrospinning technique, is examined with the help of linear stability theory. The stability of a straight jet is analyzed under conditions corresponding to the electrospinning of two types of polymeric fluids, the PIB-based Boger fluid with low electrical conductivity and the highly conductive...
In this paper, we used electrospinning to fabricate electret polyvinylidene fluoride (PVDF) membranes that show tremendous potential for its use as a high-performance air filter medium. A novel charge storage enhancer by means of nanoscale graphite platelets (NGP) dispersed within the fibrous matrix and the filtration performance were investigated. The surface potential of as-spun membrane was characterized...
A series of poly(arylene ether ketone)s (PAEKs) with dense sulfonic-acid-functionalized pendants were successfully synthesized by the Ullmann C–N coupling of a polymer precursor containing pendant iodobenzene rings and 3,6-ditrityl-9H-carbazole, followed by sulfonation using chlorosulfonic acid. A tough transparent membrane, which exhibited suitable dimensional stability and high proton conductivity,...
We fabricated a novel core–shell-type microsphere-based electrorheological (ER) composite material using poly(diphenylamine) (PDPA) as an electro-responsive coating layer onto polystyrene (PS) particles of controlled size and morphology. The coating of the core particle with a semiconducting shell was successfully achieved under a controlled environment to attain compact wrapping of surfaces, as confirmed...
The elastic properties and strength upon compression of commercial Ropaque polystyrene hollow particles were investigated by atomic force microscopy (AFM). These particles are commonly used in paints as opacifying agents, as their internal air void effectively scatters light. A sharp AFM tip was used to apply a point load to the particle surface, and increased to probe both the elastic and plastic...
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