Papers by Keyword: Copolymerization

Abstract: Combination of high energy radiation and chemical vapour deposition in the grafting process for the synthesis of metal adsorbent was investigated. Radiation-induced grafting of glycidyl methacrylate onto kenaf fiber was performed in vapour phase to develop adsorbent for removal of aluminum from aqueous solution. Morphological changes of cross-section kenaf fiber was observed via scanning electron microscope and the thickness of co-monomer in the final graft co-polymer was determined. The comparison in cross-section morphology between ungrafted kenaf fibers and grafted kenaf fiber shows approximately 3.88 [μm] thick of additional grafted layer. The functionalization of the grafted fiber using imidazole was calculated grametrically and verified by elemental analysis. Imidazole has proven to be effective on the adsorption of aluminum ion. It was found that the adsorbent could remove more than 99% aluminum with the highest adsorption capacity of 4.93 [mg/g] at pH 4 and 60 minutes reaction time.

Abstract: The copolymerization of 1,1,1,3,3,3-hexafluoroisopropyl acrylate (HFIPA) and glycidyl methacrylate via reversible addition-fragmentation chain transfer (RAFT) process was investigated. 2-cyano-2-propyl dodecyl trithiocarbonate (CPDT) was used as chain transfer agent. It is turned out that CPDT and polymeric chain transfer agent obtained based on HFIPA and CPDT provide a good control over molar mass characteristic of copolymers (Đ = 1.05). Reactivity ratios were found to be r₁(GMA) = 1.57 and r₂(HFIPA) = 0.05 by Fineman–Ross model.

Abstract: The regularities of acceptor-catalytic polycondensation in the synthesis of copolymers containing arylate, sulfone, and dichloroethylene groups in the main chain have been studied. The optimal conditions for their production have been found. Infrared spectroscopy, elemental analysis, turbidimetric titration and other methods confirmed the formation of copolymers of the proposed structure.

Abstract: The paper presents the results of the copolymerization of α-halogens of acrylic acid and N-vinylpyrrolidone in the presence of a radical initiator. The copolymerization equations are presented and activity factors are calculated. IR spectra of the obtained copolymers confirm the amination reaction. The synthesized aminated polymers form intramuscular compounds with divalent metal halides at room temperature. The kinetics of the copolymerization reaction of these systems shows that the presence of a reactive halogen atom in the structure of the copolymer has a great influence on the formation and properties of the copolymers.

Abstract: The modified aromatic polyethersulfones are synthesized. It is shown that the property of the obtained polymers depends on the ratio of the starting monomers. The presence in the initial monomer of two chlorine atoms in combination with an unsaturated bond provides the polyethersulfones based on it with high fire resistance and good physical and chemical properties, including frost resistance.

Abstract: Copolymerized poly (m-phenylene isophthalamide) (co-PMIA) fibers with excellent thermal stability and good mechanical properties were developed via solution polycondensation process based on m-phenylenediamine (MPD), isophthaloyl dichloride (IPC), and 3,4′-oxydianiline (3,4′-ODA). Effects of the ether moiety on the structure and properties of the copolymers were investigated. A series of co-PMIA nascent fibers were produced using wet-spinning method. The coagulation process to form co-PMIA nascent fibers were studied by examination of SEM and strength tester. The co-PMIA nascent fibers with the MPD/3,4′-ODA molar ratio of 8:2 showed an optimum dye uptake. Keywords: Copolymerization; High performance material; Wet spinning; Dyeability.

Abstract: Polymethylvinylsiloxane (PMVS) were prepared by pre-hydrolysis/condensation of several silicon compounds: methylvinydichlorosilane (MVDCS) and dimethyldichlorosilane (DMDCS) followed by catalysis equilibrium copolymerization by dibutyltin dilaurate (DBTDL). All manipulations in the experiments were performed under ambient condition. The PMVS were characterized by Fourier transform infrared spectroscopy (FTIR). This method has provided information about the structure of the polymer. The ¹³C NMR techniques give two sets of carbons at 1.77 ppm and 136.0 ppm consist of signals from carbons of both ligand groups, whereas ²⁹Si NMR signals of the-22.49 ppm and-35.98 ppm region are due to silicon sites bearing the methyl and vinyl ligand groups; the ²⁹Si signals of the - 109 ppm region are due to silicon sites without ligand groups attached.Keywords: Polymethylvinylsiloxane, copolymerization, NMR

Abstract: The possibility of formation of coatings based on co-polymers 2-hydroxyethylmethacrylate with polyvinylpirrolidone on different nature surfaces is determined. It is investigated, that adsorption of liquid compositions components to surface-base affects the formation of coating from such compositions. The composite metal-filled coatings are obtained on the basis of synthesized polymers. Such coatings are characterized by variable conductivity dependently on moisture content, pH and low-molecular substances availability.

Abstract: In this investigation, nanoSchiff bases Cobaltic complex was synthesized and used as the initiator in the copolymerization of carbon oxide and propylene oxide (PO). The nanoCobaltic complex was characterized by infrared spectroscopy (IR), and nuclear magnetic resonance spectroscopy (NMR). The influences of different factors, including reaction time, reaction temperature, and pressure of CO₂ on the synthesis of polycarbonate were described. The results show that nanoCobaltic complex could be successfully applied in the copolymerization of CO₂ and PO. The optimum conditions of the polymerization, which include CO₂ pressure of 30 bar, reaction temperature of 80 °C, and reaction time of 3 hours.

Abstract: Poly (methyl methacrylate) (PMMA) is known as one of the common transparent polymer materials. In this work, pure poly (methyl methacrylate), methyl methacrylate-acrylonitrile copolymer, methyl methacrylate-styrene copolymer was synthesized by bulk polymerization based on the mechanism of free radical polymerization to observe the polarity change of the PMMA after introducing styrene and acrylonitrile monomers. Meanwhile the glass transition temperature, hardness, contact angle and color distribution of the copolymer were measured through polymer temperature deformation analysis experiment, hardness and contact angle measuring instrument.