Grafting onto wool. VI. Effect of amines in ceric ion‐initiated grafting of poly(vinyl acetate)

Misra, B. N.; Kaur, Inderjeet; Dogra, Ramesh

doi:10.1002/app.1979.070240702

Cited by 32 publications

(9 citation statements)

References 15 publications

(1 reference statement)

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The metal ions are supposed to form an ionpolymer chelate complex, which dissociates via one electron transfer to produce free radicals. 30 The graft copolymerization of methyl methacrylate on to Agave americana fibers under pressure in the presence of ceric ions as initiators was reported earlier. 31 A percentage grafting (P g ) of 13.6% was obtained, and it was observed that the grafting of methyl methacrylate on to agave fiber resulted in improved physicochemical and thermal properties.…”

Section: Introductionmentioning

confidence: 77%

See 1 more Smart Citation

Chemically induced graft copolymerization of acrylonitrile onto lignocellulosic fibers

Singha

Rana

2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

The grafting of vinyl monomers is an important method for replacing hydrophilic hydroxyl groups present on the surface of natural fibers by hydrophobic polymer chains. It improves the compatibility of natural fibers with polymer matrixes during the fabrication of natural-fiber-reinforced polymer composites. This article deals with the graft copolymerization of acrylonitrile onto Agave americana fibers in air in the presence of ceric ammonium nitrate as a redox initiator. A maximum percentage grafting of 24% was obtained after the optimization of various reaction parameters, including the reaction time, temperature, and concentrations of nitric acid, initiator, and monomer. The graft copolymers obtained under the optimum conditions were then subjected to the evaluation of different physicochemical properties, including swelling behavior in different solvents, moisture absorption behavior under different humidity levels, and chemical resistance. The graft copolymers were further characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, thermal analysis (thermogravimetric analysis/differential thermal analysis), and X-ray diffraction techniques.

show abstract

Section: Introductionmentioning

confidence: 77%

“…In general, metal ions with lower oxidation potentials result in better graft efficiency. The metal ions are supposed to form an ion–polymer chelate complex, which dissociates via one electron transfer to produce free radicals 30…”

Section: Introductionmentioning

confidence: 99%

Chemically induced graft copolymerization of acrylonitrile onto lignocellulosic fibers

Singha

Rana

2011

J of Applied Polymer Sci

View full text Add to dashboard Cite

show abstract

Section: Membrane Modificationmentioning

confidence: 99%

“…Among metallic ions, the ceric ion is more capable of transferring an electron and forming a complex with hydroxyl groups on the polymer backbone, which can ultimately lead to free radicals generation [ 194,195 ] (1) Ce 4+ + R polym OH→complex→R poly O ′ + Ce 3+ + H + (2) R poly O′ + M→ R cell OM′→ R poly OMM′ Liu et al [ 22 ] used ceric (IV) ammonium nitrate (CAN) as an initiator and grafted zwitterionic monomer of poly(2-methacryloyloxyethyl phosphorylcholine) (PMPC) on poly(arylene ether sulfone) membrane surface containing hydroxyl groups (PES-OH) by redox graft polymerization ( Figure 19 ).…”

Section: Surface Pretreatment Strategiesmentioning

confidence: 99%

Current Approaches in Improving Hemocompatibility of Polymeric Membranes for Biomedical Application

Salimi

Ghaee

Ismail

et al. 2016

Macro Materials & Eng

View full text Add to dashboard Cite

Suitable membranes for blood‐contacting medical applications need to be resistant in confrontation with blood proteins and cells, while possessing high blood compatibility and permeability at the same time. Herein, an overview of the recent advances and strategies that have been used to enhance the hemocompatibility of polymeric membranes is provided. The review focuses on two modification strategies: (i) physical modifications and (ii) chemical modifications. It also highlights the current progress in the design of hemocompatible‐functionalized membranes for biomedical applications. Subsequently, the commonly applied biocompatibility tests are also discussed and finally the future perspectives of the application of polymeric membranes in the biomedical field are presented.

show abstract

“…Aqueous vinyl polymerizations initiated by ceric salts alone or ceric salt‐reducing agent systems have been extensively studied 1–11. The end group profiles of the polymers that have been prepared using these systems indicated that the mechanisms of initiation and termination were largely dependent on the experimental conditions.…”

Section: Introductionmentioning

confidence: 99%

N‐isopropylacrylamide–acrylamide copolymers initiated by ceric ammonium nitrate in water

Erbi̇l

Gökçeören

Polat

2007

Polymer International

View full text Add to dashboard Cite

The polymerization and copolymerization of N-isopropylacrylamide (NIPAAm) and acrylamide (AAm) at different compositions, initiated by ceric ammonium nitrate alone, were studied in water at 60 • C. The dependence of the polymerization yield and molecular weight on the reaction temperature, nitrate ion concentration, presence of organic solvent and feed composition were examined by gravimetry, Fourier transform infrared (FTIR) spectroscopy and viscosity. The Viscotek system consists of three on-line detectors, namely right-angle light scattering, refractometer and viscometer, which were used to determine the number-average molecular weight (M n ) and hydrodynamic radius (R h ) of the NIPAAm-rich copolymers. It was observed that both M n and R h values of the copolymers decreased with increasing AAm content in the feed. The reactivity ratios of NIPAAm (2) and AAm (1) were computed by the extended Kelen-Tüdós method at high conversion, using FTIR analysis, and were found to be r 2 = 2.26 and r 1 = 0.34 for NIPAAm-rich copolymers, i.e. heterogeneous copolymers. From the determination of the lower critical solution temperature (LCST), i.e. phase transition of 2.0 wt% aqueous solutions of NIPAAm/AAm copolymers and NIPAAm homopolymer (PNIPAAm), using a UV-visible spectrometer, it was found that the hydrophilicity and LCSTs of the chains could be changed in a narrow temperature range by controlling the initial compositions. Turbidities (τ ) obtained from the absorbance values at three different wavelengths (λ; 400, 500 and 600 nm) were used to interpret the macromolecular phase transition from hydrophilic to hydrophobic structure. The effects of comonomer content and temperature on the coil-globule transition are discussed in terms of the slopes of the linear plots of log τ versus log λ.

show abstract

Grafting onto wool. VI. Effect of amines in ceric ion‐initiated grafting of poly(vinyl acetate)

Cited by 32 publications

References 15 publications

Chemically induced graft copolymerization of acrylonitrile onto lignocellulosic fibers

Chemically induced graft copolymerization of acrylonitrile onto lignocellulosic fibers

Current Approaches in Improving Hemocompatibility of Polymeric Membranes for Biomedical Application

N‐isopropylacrylamide–acrylamide copolymers initiated by ceric ammonium nitrate in water

Contact Info

Product

Resources

About