Jingmin Gao

Synthesis of Fe3O4@poly(methylmethacrylate-co-divinylbenzene) magnetic porous microspheres and their application in the separation of phenol from aqueous solutions

A simple strategy to fabricate magnetic porous microspheres of Fe(3)O(4)@poly(methylmethacrylate-co-divinylbenzene) was demonstrated. The magnetic microspheres, consisting of polymer-coated iron oxide nanoparticles, were synthesized by the modified suspension polymerization of methacrylate and divinylbenzene in the presence of a magnetic fluid. The morphology and the properties of the magnetic porous microspheres were examined by scanning electron microscopy, transmission electron microscopy, superconducting quantum interference device, Fourier transform infrared spectroscopy, thermogravimetry, and X-ray powder diffraction. The pore size distribution and the specific surface area of the microspheres were measured by nitrogen sorption and mercury porosimetry technique. As predicted from the previous knowledge, the magnetic porous microspheres possessed a high specific surface area using n-hexane as a porogen. It was further found that the amounts of divinylbenzene and methacrylate, the ratio of porogens, and the dosage of ferrofluids affect the specific surface area of the microspheres. Furthermore, the microspheres were applied to remove phenol from aqueous solutions. The results showed that the microspheres had a high adsorption capacity for phenol and a high separation efficiency due to their porous structure, polar groups, and superparamagnetic characteristic.

Recent Research Progress in the Synthesis of Polyphosphazene and Their Applications

In the past five decades, many new types of polymers, containing nitrogen and phosphorus atoms as a significant part of the polymer backbone, have been synthesized. This paper reviews the developments in the field of polyphosphazenes and their applications. In this paper, synthesis, characterization, functionalization and practical applications of polyphosphazenes are described.

Study on Poly(ferrocenylsilane) and Its Promotive Effect to Decomposition of Ammonium Perchlorate

S OLID propellant is one of the most significant ingredients used in rockets. The burning rate of propellant is a vital parameter for rocket design. A promising method to enhance the burning rate of propellants is to use burning-rate promoters (BRPs). BRPs have become increasingly important and are receiving more attention recently due to their successful use in solid propellant burning-rate enhancement. Generally, there are several kinds ofBRPs; transitionmetal oxides, nanometal particles, metal chelate, ferrocene, and its derivatives. Transition metal oxide BRPs are cheap, but the burning-rate improvement of propellant is limited. The addition of nanometal particles can enhance the burning rate because nanometal particles have large specific surface areas and higher surface energy. However, nanometal particles are difficult to disperse well and passivation is needed for their surface to prevent spontaneous combustion in air [1]. Organic metal chelate BRPs, such as copper organic chelate and Plumbum iron double metal chelate, can greatly enhance the burning rate due to their good dispersion in propellants. Ferrocene and its derivatives have attracted much attention for their fascinating properties as BRPs [2]. They have been widely used in composite propellant, especially to enhance the burning rate of butyl hydroxide propellant, which contains ammonium perchlorate (AP) and aluminum powder. When ferrocene and its derivatives are used as BRPs, they are easy to migrate during storage. This migration affects their application in propellants. In this Note, we explore the possibility of using a series of poly(ferrocenylsilanes) with highmolecular weights as BRPs.

Recent Research Progress in the Synthesis of Polyphosphazene Elastomers and Their Applications

Polyphosphazenes elastomers have major utilization as fire resistant materials, gas kits, O-rings, electrical insulation, oil-resistant hoses, foam, ceramics, especially helicopter, air craft, aerospace, military and navy hardware applications. Tremendous achievements have been obtained for the synthesis and applications of polyphosphazenes. In this review, we highlighted the types, synthesis, characterization and applications of polyphosphazenes elastomers.

Synthesis of a Novel Ferrocene-Based Epoxy Compound and Its Electrochemical Behavior

A novel ferrocene-based epoxy compound was synthesized. It was characterized by 1H-NMR and FT-IR. The influence of different solvents and potential scan rates on the cyclic voltammetry (CV) behavior of the resultant compound was investigated. The relationship between the peak currents and potential scan rates indicates that the charge transport of the resultant ferrocene-based epoxy compound obeys Ficks Law.

Recent Research Progress on Polymer Grafted Carbon Black and Its Novel Applications

Abstract Polymer grafting of carbon black (CB) has been intensely researched as polymer modification is one of the effective means for improving the solubility and compatibility of carbon black. Recent advances in the polymer grafting methods allow the introduction of polymers with well controlled composition, structure and molecular weight onto the surface of CB. In addition, modification by functional polymers provides a powerful impetus to extend the applications of polymer-CB composites such as sensitive materials. This review focuses on the development of these grafting polymerization methods and some novel applications of polymer grafted CB.

Synthesis and Characterization of Poly(bis(ethyl salicylate)phosphazenes) and Poly(bis(ethyl salicylate diethylamino)phosphazenes) and Their Hydrolytic Degradation

The polydichlorophosphazenes were synthesized from hexachlorocyclotriphosphazenes by ring opening polymerization in the presence of AlCl3 as a catalyst. Poly[bis(ethyl salicylate)phosphazenes] (PESP) and poly[bis(ethyl salicylate diethylamino)phosphazenes] (PESDEAP) were synthesized via macromolecular substitution reactions using ethyl salicylate and (or) diethylamine as side groups. The synthesis results were proved by nuclear magnetic resonance (1H NMR, and 31P NMR) and gel permeation chromatography. In addition, the hydrolytic degradation of PESP and PESDEAP was investigated at constant temperature in neutral medium.

Synthesis and Characterization of Poly[bis(p-oxybenzaldehyde diethylamino)phosphazenes], Poly[bis(p-oxybenzaldehyde)phosphazenes], Poly[bis(diethylamino)phosphazenes] and their Self- assembly Behaviors

Polydichlorophosphazenes (PDCP) were synthesized through ring opening polymerization of hexachlorocyclotriphosphazene (HCCP). The polymerization behavior of HCCP under varying conditions of time and amount of catalyst was investigated. The chlorine atoms in polydichlorophosphazenes (PDCP) were substituted with p-oxybenzaldehyde and (or) diethylamine to synthesize poly[bis(p-oxybenzaldehyde diethylamino)phosphazenes](PPOBADEAP), poly[bis(p-oxybenzaldehyde)phosphazenes] (PPOBAP) and poly[bis(diethyl amino) phosphazenes] (PDEAP). The supporting evidence for the success of this synthesis was provided by nuclear magnetic resonance (1H-NMR, and 31P-NMR), gel permeation chromatography (GPC), and energy-dispersive X-ray spectroscopy (EDAX). The self-assembly behavior of PPOBADEAP, PPOBAP and PDEAP was observed in different solvents by the same concentration of polymers. The optical microscopy, scanning electron microscopy (SEM) and transmission electron microscopy (TEM) images indicated that PPOBADEAP formed various morphologies in different solvents while PPOBAP and PDEAP did not show self-assembly behavior at the same conditions.