Radiation-induced graft copolymerization of methacrylic acid onto polypropylene fibers. III. Characterization

Mukherjee, A. K.; Gupta, Bhuvanesh

doi:10.1002/app.1985.070300536

Cited by 24 publications

(14 citation statements)

References 3 publications

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“…In our earlier studies on the grafting of methacrylic acid and 2-hydroxyethylmethacrylate into polypropylene, the heat of fusion decreased as a function of the polypropylene fraction in the copolymer. 25,28 It was found that the grafting takes place in the noncrystalline region of the base polymer, thereby exerting a dilution effect on the inherent crystallinity. The XRD pattern, as discussed earlier, suggests that the PAAm grafts are amorphous in nature.…”

Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

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Development of membranes by radiation grafting of acrylamide into polyethylene films: Characterization and thermal investigations

Gupta¹,

Anjum

2001

J of Applied Polymer Sci

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Polyethylene-g-polyacrylamide membranes were prepared by graft polymerization of acrylamide into polyethylene films by preirradiation technique. The characterization and thermal behavior of membranes with different degrees of grafting were evaluated by density, X-ray diffraction, thermogravimetric analysis, and differential scanning calorimetry measurements. Grafting led to considerable changes in the structure of polyethylene membranes. The density of the polyethylene film increased wtih the increase in the degree of grafting, although the increase beyond 100% grafting was less pronounced than at lower graft levels. The heat of fusion and the crystallinity of polyethylene decreased with the increase in the degree of grafting. The decrease in crystallinity is because of the cumulative effect of the dilution of inherent crystallinity by the incorporation of amorphous polyacrylamide grafts within the noncrystalline region of polyethylene (dilution effect) and partial disruption of the crystallites (crystal defects). X-ray diffraction measurements also revealed a decrease in the crystallinity in grafted films. Membranes behaved as a two-component system where polyethylene and polyacrylamide components underwent independent degradation irrespective of the graft levels. In general, the thermal stability of polyethylene in membranes was markedly improved by the grafting of acrylamide monomer as evident from the initial decomposition temperature increasing from 311°C for virgin PE to 390°C in grafted membranes.

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Section: Differential Scanning Calorimetry (Dsc)mentioning

confidence: 99%

“…25 The column was prepared using carbontetrachloride (d, 1.59 g/cm 2 ) and ethanol (d, 0.79 g/cm 2 ).…”

Section: Density Measurementmentioning

confidence: 99%

Development of membranes by radiation grafting of acrylamide into polyethylene films: Characterization and thermal investigations

Gupta¹,

Anjum

2001

J of Applied Polymer Sci

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“…This appears to be due to the increase in the amorphous content of the PMAA in the grafted film. [15] Thermogravimetric Analysis (TGA)…”

Section: Graft Copolymerization 1415mentioning

confidence: 99%

Chemically Induced Graft Copolymerization of Methacrylic Acid onto Low Density Polyethylene Films Using Sodium Bisulfite

El-Awady

Eissa

2005

Polymer-Plastics Technology and Engineering

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A simple and inexpensive technique for preparation of membranes by chemically induced graft copolymerization of methacrylic acid (MAA) onto low-density polyethylene (PE) films using sodium bisulfite (SBS) initiator was developed. Several parameters affecting the grafting rate and yield, such as the concentration of aqueous monomer solutions (4-20%) and initiator (0.025-0.2 M/L), reaction temperature (50-70 C), and within reaction times ranging from 1 to 6 h were studied. The results show that grafted films with 20% up to 500% graft were obtained under the synthesis conditions mentioned. Some selective properties of the grafted films (membranes), such as ORDER REPRINTS swelling behavior and mechanical properties were investigated. Also, the films were characterized by infrared (IR) spectroscopy, thermal gravimetric analysis (TGA), and scanning electron microscopy (SEM). Such prepared graft copolymers may be of great interest in some practical uses such as dialysis and ultrafiltration membranes and also for wastewater treatment from heavy and toxic metals.

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“…weight of grafted PHEMA grafting efficiency = -= x 100 total polymer yield Infrared Spectroscopy • Infrared spectra of the samples were recorded on a Perkin-Elmer instrument [15].…”

Section: Grafting Proceduresmentioning

confidence: 99%

Radiation-Induced Grafting of 2-Hydroxyethyl Methacrylate Onto Polypropylene For Biomedical Applications. I. Effect of Synthesis Conditions

Gupta¹,

Tyagi²,

Ray³

et al. 1990

Journal of Macromolecular Science: Part A - Chemistry

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Graft copolymerization of 2-hydroxyethyl methacrylate onto polypropylene monofilament was carried out by using a simultaneous gamma radiation technique from a "Co source, so that the hydrogel polypropylene-g-polyhydroxyethyl methacrylate thus produced by grafting could be used as a biocompatible suture material. The influence of various parameters, such as dose rate, total dose, and monomer concentration, on the degree of grafting was determined. It was found that the degree of grafting increases with an increase in monomer concentration. However, for a constant dose under optimum monomer concentration (1.5-2.0 mol/L), a low dose rate produces better graft levels. The studies showed that grafting is strongly influenced by the reaction medium. The optimum conditions for the system were determined. The grafting was ascertained by infrared spectroscopy and color formation with methylene blue. GUPTA ETAL.The grafted monofilament showed very good swelling behavior in water due to the incorporation of hydrophilicity in the copolymer monofilament.

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Radiation-induced graft copolymerization of methacrylic acid onto polypropylene fibers. III. Characterization

Cited by 24 publications

References 3 publications

Development of membranes by radiation grafting of acrylamide into polyethylene films: Characterization and thermal investigations

Development of membranes by radiation grafting of acrylamide into polyethylene films: Characterization and thermal investigations

Chemically Induced Graft Copolymerization of Methacrylic Acid onto Low Density Polyethylene Films Using Sodium Bisulfite

Radiation-Induced Grafting of 2-Hydroxyethyl Methacrylate Onto Polypropylene For Biomedical Applications. I. Effect of Synthesis Conditions

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