7,953 research outputs found
Polyurethane/Polyaniline and Polyurethane-Poly(methyl methacrylate)/Polyaniline Conductive Core-Shell Particles: Preparation, Morphology, and Conductivity
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Morphology of PU/PMMA Hybrid Particles from Miniemulsion Polymerization: Thermodynamic Considerations
No full textConductive composite particles synthesized via pickering emulsion polymerization using conductive latex of poly(3,4-ethylenedioxythiophene) (PEDOT) as stabilizer
No full textIn this research, poly(3,4-ethylenedioxythiophene) (PEDOT) nanoparticles less than 100 nm were synthesized first and applied as the solid stabilizer for producing PEDOT-polystyrene (PEDOT-PSt) composite latex by Pickering emulsion polymerization. The results showed that most PEDOT nanoparticles adhered to the PSt core particles having the size from 100 to 250 nm. By casting the latex, the obtained PEDOT-PSt film had a surface resistance of 4–5 kΩ/□, almost the same as the pure PEDOT film, though its PEDOT content was only 6.2 wt%. Those PEDOT nanoparticles in the outer layer could contact with one another, forming a continuous network as the conductive passageway. Furthermore, soft latex particles of poly(styrene-co-butyl acrylate), P(St-BA), were synthesized and mixed with the conducting rigid PEDOT-PSt latex for improving the toughness and transparency of the casting film. A critical point at about 2 wt% of PEDOT content in the PEDOT-PSt/P(St-BA) film was observed in the surface resistance measurement.SCI紙
Synthesis of Chitosan-Poly(acrylic acid) Complex Particles by Dispersion Polymerization and Their Applications in ph Buffering and Drug Release
No full text100學年度研究獎補助論文This research prepared polyelectrolyte complex particles of chitosan-poly(acrylic acid) (CS-PAA) through polymerization of acrylic acid (AA) in the presence of chitosan (CS). The prepared CS-PAA complex particles had positive zeta potential and dispersed very well in the aqueous solution. Structure and morphology of complex particles were investigated with the changes in the feeding molar ratio of glucosamine unit in CS to AA monomer. It was found at a molar ratio of 1.0/1.1, a hollow structure in complex particles was observed after polymerization. From solid state 13C-NMR and FTIR analyses, the results confirmed that CS-co-PAA copolymer was also produced during polymerization in addition to the PAA homopolymer, and both constituted in the structure of complex particles. The synthesized complex particles were environmentally sensitive in which their mean diameter could change with the pH value of medium. Moreover, the complex particles showed a continuous release of the encapsulated doxycycline hyclate up to 8 days. These complex particles with environmentally sensitive properties are expected to be utilized in the hydrophilic drug delivery system.SCI電子
Preparation and characterization of chitosan-g-poly (vinyl alcohol)/poly (vinyl alcohol) blends used for the evaluation of blood-contacting compatibility
No full textCrystallization kinetics and thermal degradation behavior of low-density polyethylene blended with poly(bispropoxyphosphazene)
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