Synthesis of permselective membranes by radiation induced grafting of hydrophilic monomers into poly(tetrafluoroethylene) films

Chapiró, A.; Jendrychowska-Bonamour, A.-M.

doi:10.1002/pen.760200306

Cited by 45 publications

(10 citation statements)

References 15 publications

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“…9 Ionizing or high-energy radiation were particularly studied for radiation grafting of vinyl monomers into PTFE films. Acrylic acid, 10 -12 methacrylic acid, 13 N-vinylpyrrolidone, 10,11 4-vinylpyridine, 10,11,14 and vinylfluoride 15,16 are some examples of these monomers.…”

Section: Introductionmentioning

confidence: 99%

?-Irradiated poly(tetrafluoroethylene) particle-filled low-density polyethylene. I. Effect of silane coupling agents on mechanical, thermal, and morphological properties

Akinay

Ti̇nçer

1999

J. Appl. Polym. Sci.

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Poly(tetrafluoroethylene) (PTFE) scraps were recovered as a filler material for low-density polyethylene (LDPE) after they were degraded by Co-60 ␥-rays under atmospheric conditions to make small-size powder. The powder PTFE, which was called secondary PTFE (2°-PTFE), was melt mixed with LDPE and then extruded to obtain 200 m films. The mechanical and thermal properties and also the morphology of the fractured surface of these 2°-PTFE-filled LDPE were studied. It was found that the addition of 2°-PTFE resulted in thermofilm property of LDPE but it slightly decreased the thermal oxidative temperature of LDPE. The tensile strength and ultimate elongation of LDPE were found to decrease with the addition of 2°-PTFE. However, when it is compared to the addition of virgin PTFE into LDPE, 2°-PTFE shows better mechanical properties due to the presence of oxy groups which are capable of interacting with the main matrix. A further improvement in mechanical properties was achieved by silane coupling agent treatment of 2°-PTFE. Silane coupling agents were found to enhance the interfacial adhesion between 2°-PTFE and LDPE. The study on the fractured surfaces by scanning electron microscope revealed this adhesion between these two polymers.

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Section: Introductionmentioning

confidence: 99%

?-Irradiated poly(tetrafluoroethylene) particle-filled low-density polyethylene. I. Effect of silane coupling agents on mechanical, thermal, and morphological properties

Akinay

Ti̇nçer

1999

J. Appl. Polym. Sci.

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“…Radiation-grafted membranes have gained much importance in recent years because of their wide range of applications [1][2][3][4] and ease of synthesis. 5 Fluoropolymers have been mainly used to synthesize these membranes as they are thermally and mechanically stable.…”

Section: Introductionmentioning

confidence: 99%

Proton‐exchange membranes via the grafting of styrene and acrylic acid onto fluorinated ethylene propylene copolymer by a preirradiation technique. IV. Dynamic mechanical analysis, X‐ray diffraction, and scanning electron microscopy studies of grafted and sulfonated membranes

Phadnis

Patri

Chakraborty

et al. 2005

J of Applied Polymer Sci

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ABSTRACT:The grafting of styrene and acrylic acid onto fluorinated ethylene propylene copolymer was carried out by a preirradiation technique. The resulting membranes were sulfonated with concentrated sulfuric acid. The effects of the degree of grafting and sulfonation on the structure of the membranes were studied by X-ray diffraction and scanning electron microscopy. The crystallinity percentage decreased with increasing grafting. Scanning electron microscopy studies confirmed that grafting took place by a front mechanism, by which grafting started at the surface and slowly proceeded inwards. The dynamic mechanical properties of the membranes and their sulfonated derivatives were also investigated. The storage modulus at room temperature increased with grafting and increased further with sulfonation.

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“…17 Graft copolymerization of fluoropolymer films by polystyrene with subsequent sulfonation has also been carried out and their structural properties have been investigated. 27 Our approach for the grafting process is to use butyl acrylate (BA) in combination with AMS as the monomer system. The radiation grafting of PEEK films has been investigated recently in such a way that the copolymers with desired functionality are developed.…”

Section: Introductionmentioning

confidence: 99%

Structural characterization of alpha methyl styrene‐butyl acrylate‐grafted polyetheretherketone films

Gautam¹,

Ikram²,

Gupta³

2012

J of Applied Polymer Sci

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Radiation-induced graft copolymerization of alpha methyl styrene (AMS)-butyl acrylate (BA) mixture onto poly(etheretherketone) (PEEK) was carried out to develop films of varying copolymer compositions. The characterization of films was carried out with fourier transform infrared spectroscopy (FTIR), differential scanning calorimetry (DSC), thermogravimetry analysis (TGA), X-ray diffraction analysis (XRD), scanning electron microscopy (SEM) and atomic force microscopy (AFM). The presence of AMS and BA units within the film matrix was confirmed by FTIR. The intensity of the characteristic peaks for AMS and BA increased with the increasing grafted component in the films. The crystallinity of the films as observed from DSC and XRD decreased with the increasing graft levels. On the other hand, the melting temperature of the base polymer was almost unaffected by irradiation and the grafting process. The glass transition temperature (T g ) of the grafted film increased as compared to the virgin PEEK. Ungrafted film showed a stable thermogram up to $500 C. However, the grafting introduced a new decomposition range in the copolymer, due to the presence of the AMS/BA. AFM images showed the formation of domains on the grafted PEEK film surface. The SEM also showed domain formation of the grafted component within the PEEK matrix. However, the fracture analysis did not show any prominent phase separation. Mechanical characterization of films in terms of tensile strength, elongation, and modulus was also carried out.

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Synthesis of permselective membranes by radiation induced grafting of hydrophilic monomers into poly(tetrafluoroethylene) films

Cited by 45 publications

References 15 publications

?-Irradiated poly(tetrafluoroethylene) particle-filled low-density polyethylene. I. Effect of silane coupling agents on mechanical, thermal, and morphological properties

?-Irradiated poly(tetrafluoroethylene) particle-filled low-density polyethylene. I. Effect of silane coupling agents on mechanical, thermal, and morphological properties

Proton‐exchange membranes via the grafting of styrene and acrylic acid onto fluorinated ethylene propylene copolymer by a preirradiation technique. IV. Dynamic mechanical analysis, X‐ray diffraction, and scanning electron microscopy studies of grafted and sulfonated membranes

Structural characterization of alpha methyl styrene‐butyl acrylate‐grafted polyetheretherketone films

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