Surface modification of poly(tetrafluoroethylene)with benzophenone and sodium hydride by ultraviolet irradiation

Noh, Insup; Chittur, Krishnan K.; Goodman, Steven L.; Hubbell, Jeffrey A.

doi:10.1002/(sici)1099-0518(199706)35:8<1499::aid-pola19>3.0.co;2-2

Cited by 47 publications

(34 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Surface modification of fluoropolymers has been reported by means of several wet chemical treatments [9,[14][15][16], as well as by some physical procedures such as plasma [17], ion beam [18], γ-radiation [19], extreme UV light [20] or vacuum UV light [21].…”

Section: Introductionmentioning

confidence: 99%

Photografted fluoropolymers as novel chromatographic supports for polymeric monolithic stationary phases

Catalá-Icardo

Torres-Cartas

Lloret

et al. 2018

Talanta

View full text Add to dashboard Cite

In this study, porous polymer monoliths were in situ synthesized in fluoropolymers tubing to prepare microbore HPLC columns. To ensure the formation of robust homogeneous polymer monoliths in these housing supports, the inner surface of fluoropolymer tubing was modified in a two-step photografting process. Raman spectroscopy and scanning electron microscopy (SEM) confirmed the successful modification of the inner poly(ethylene-co-tetrafluoroethylene) (ETFE) wall and the subsequent attachment of a monolith onto the wall. Poly(glycidyl methacrylate-co-divinylbenzene), poly(butyl methacrylate-co-ethyleneglycol dimethacrylate) and poly(styrene-co-divinylbenzene) monoliths were in situ synthesized by thermal polymerization within the confines of surface vinylized ETFE tubes. The resulting monoliths exhibited good permeability and mechanical stability (pressure resistance up to 9 MPa). The chromatographic performance of these different monolithic columns was evaluated via the separation of alkyl benzenes and proteins in a conventional HPLC system.

show abstract

Section: Introductionmentioning

confidence: 99%

Photografted fluoropolymers as novel chromatographic supports for polymeric monolithic stationary phases

Catalá-Icardo

Torres-Cartas

Lloret

et al. 2018

Talanta

View full text Add to dashboard Cite

show abstract

“…McDowall and coworkers reported2 that the γ‐radiation induced preirradiation method showed higher elongation, faster recovery, and more uniform graft copolymer distribution throughout the cross section than those achieved by the ceric‐ion initiation method. The graft copolymerization of various monomers onto natural cellulose and synthetic polymers has been extensively investigated using high‐energy radiation3–7 and chemical initiation8–12 methods. An alternative to those is the photoinduced graft copolymerization method initiated by UV radiation.…”

Section: Introductionmentioning

confidence: 99%

Graft copolymerization and characterization of 2‐hydroxyethyl methacrylate onto jute fiber by photoirradiation

Khan

Ahmad

2006

J of Applied Polymer Sci

View full text Add to dashboard Cite

UV radiation induced graft copolymerization of 2-hydroxyethyl methacrylate onto natural lignocellulose (jute) fiber was carried out by two methods: simultaneous irradiation and grafting and preirradiation grafting. 1-Hydroxycyclohexyl-phenylketone was used as the photoinitiator in both methods. In the former method, the variation of the graft weight was measured for different values of radiation exposure time and the concentrations of both the monomer and photoinitiator. The latter method produced up to 76% graft weight compared to 45% obtained with the former method. The preirradiation method offers better control of the homopolymerization reaction compared to that afforded by the other method. The optimum value of the reaction parameters on the graft weight was evaluated. The mechanical properties of grafted samples were found to be drastically different from those of the as-received ones and the effect was proportional to the percentage of graft weight. Differential scanning calorimetry studies showed that the percentage of graft add-on of hydroxyethyl methacrylate with jute had a significant effect on the thermal properties. IR studies indicated the degree of grafting could be estimated by correlating the band intensities with the graft weight. The jute samples grafted with poly(hydroxyethyl methacrylate) at a level of 12% graft weight exhibited a maximum 20% increase in hydrophilicity.

show abstract

“…This aim can be achieved in three ways: (a) covering the unmodified surface with a shell (core–shell particles);1 (b) modifying the surface with less antiadhesive groups; (c) modifying the surface with functional groups suitable for chemical coupling with the matrix polymer 2. Because of the outstanding chemical resistance of this material, modifying the surface of PTFE appears to be difficult and can be achieved chemically by treatment with high reactive alkali metals/‐hydrides or organometallic reagents 3–6. For several reasons, this method appears to be unsuitable for a modern industrial process.…”

Section: Introductionmentioning

confidence: 99%

Functionalization of irradiated PTFE micropowder with methacryl‐ or hydroxy groups for chemical coupling of PTFE with different matrix polymers

Klüpfel

Lehmann

2006

J of Applied Polymer Sci

View full text Add to dashboard Cite

This article describes the modification of electron beam irradiated polytetrafluoroethylene (PTFE) material (500 kGy) into a functionalised micropowder, bearing methacrylate or hydroxy groups. The aim of this work is to achieve compatibilization of modified PTFE in a variety of matrix polymers, such as elastomers and duromers. It is well known that irradiation of high molecular PTFE in the presence of air, followed by annealing with water vapor, leads to a functionalization of the PTFE micropowder, containing carboxylic acid groups. For sufficient stability of the coupling of the functional groups that are to be introduced via these acid groups, a transformation into amide groups is necessary, and can be performed by the reaction of the electron beam irradiated PTFE with -caprolactam in the first step. The corresponding acid-terminated PTFE-oligoamide is then reacted with functional epoxy monomers, like glycidol or glycidyl methacrylate, to obtain the functionalised PTFE micropowders (PTFE-OH and PTFE-MA). As the number of COOH groups in the electron beam irradiated PTFE is not very high, IR-spectroscopic identification of the functional groups is not very distinct. To find evidence for the existence/reactivity of the additionally introduced functional groups, model reactions have been performed, where PTFE-MA is reacted with methyl methacrylate/AIBN. IR spectroscopic analysis of the reaction products shows characteristic absorption bands of PMMA, indicating successful graft polymerization of PMMA to PTFE-MA. For PTFE-OH, reaction with cyclohexylisocyanate leads to a bisurethane adduct, which shows a strong urethane absorption in the IR spectrum.

show abstract

Surface modification of poly(tetrafluoroethylene)with benzophenone and sodium hydride by ultraviolet irradiation

Cited by 47 publications

References 2 publications

Photografted fluoropolymers as novel chromatographic supports for polymeric monolithic stationary phases

Photografted fluoropolymers as novel chromatographic supports for polymeric monolithic stationary phases

Graft copolymerization and characterization of 2‐hydroxyethyl methacrylate onto jute fiber by photoirradiation

Functionalization of irradiated PTFE micropowder with methacryl‐ or hydroxy groups for chemical coupling of PTFE with different matrix polymers

Contact Info

Product

Resources

About