Radiation grafting of vinyl monomers onto poly(tetrafluoroethylene) powder produced by gamma irradiation and properties of grafted poly(tetrafluoroethylene) filled low density polyethylene

Akinay, E
Tincer, T
Scrap poly(tetrafluoroethylene) (PTFE) was gamma irradiated under an ambient atmosphere in order to produce extensive chain scission and oxidative degradation. After irradiation the PTFE was ground into a fine powder (2 degrees -PTFE) and graft;ed with styrene (St), vinyl acetate (VAc), and 4-vinylpyridine (4-VP) by using the direct irradiation technique. The grafted PTFE were then blended with low density polyethylene (LDPE). The study covered the characterization of irradiated PTFE and grafted 2 degrees -PTFE powder with various methods. Mechanical grinding was found to reduce trapped radicals formed during the irradiation process faster than the annealing process. Grafting on 2 degrees -PTFE was followed by gravimetric analysis, TGA, and the change in the particle size of the samples. Although we reached almost 20% grafting by weight in the St and 4-VP monomers, VAc grafting was found to be maximum at around 8% by weight at the maximum absorbed dose. The addition of VAc grafted 2 degrees -PTFE into LDPE produced better final mechanical properties with a fine dispersion. However, as may be expected, the incorporation of the other two 2 degrees -PTFEs into LDPE showed low film quality and poor mechanical properties. (C) 2000 John Wiley & Sons, Inc.


NUGAY, N; HOSOTTE, C; NUGAY, T; RIESS, G (Elsevier BV, 1994-10-01)
Poly(methylmethacrylate)-poly(4-vinylpyridine) diblock copolymers were synthesized by sequential anionic polymerization. 1,1-diphenyl-3-methylpentyllithium was used as initiator and LiCl was added to the system as ligand to modify both initiator and active chain end in order to avoid side reactions. The products were characterized by H-1-NMR spectroscopy, size exclusion chromatography and differential scanning calorimetry. The block copolymers show narrow molecular weight distribution and microphase separat...
SACAK, M; Akbulut, Ural; KISAKUREK, D; TURKER, L; Toppare, Levent Kamil (Wiley, 1989-04-01)
Electroninitiated polymerization of bis(trichlorophenoxo)‐N,N,N′,N′‐tetramethylethylene diamine copper(II) was achieved in acetonitrile at various peak potentials of the monomer. A constant potential approach was selected in polymerization reactions. Electrolyses were carried out under air, nitrogen, and oxygen atmospheres. Structural analyses of the polymers were done by 1H‐NMR and 13C‐NMR FT–IR spectroscopy. Molecular weights of the polymers were determined by vapor pressure (isopiestic) method.
Conducting copolymers of 3-methylthienyl methacrylate and p-vinylbenzyloxy poly(ethyleneoxide) and their electrochromic properties
Yildiz, HB; Kiralp, S; Toppare, Levent Kamil; Yilmaz, F; Yagci, Y; Ito, K; Senyo, T (Springer Science and Business Media LLC, 2005-01-01)
A random copolymer (CP) containing 3-methylthienyl methacrylate (MTM) and p-vinylbenzyloxy poly(ethyleneoxide) (PEO-VB) units was synthesized. Further graft copolymerization of CP with pyrrole (Py) and thiophene (Th) were achieved in H2O - sodium dodecyl sulfate (SDS), H2O - p-toluenesulphonic acid (PTSA) and acetonitrile (AN) - tetrabutylammonium tetrafluoroborate (TBAFB) solvent electrolyte couples via constant potential electrolyses. Characterization was performed by cyclic voltammetry (CV), nuclear magn...
Batteries and a Pinch of Salt: A Simple Toolkit for the Production of Poly(methylsilyne)
Eroglu, Darnla; Nur, Yusuf; Soenmez, Umut; Bayram, Göknur; Pitcher, Michael W.; Toppare, Levent Kamil (Wiley, 2009-06-15)
A simple synthesis of poly(methylsilyne) has been developed. The straightforward polymerization reaction can be accomplished using simply a series of batteries and a very simple electrolyte. Poly(methylsilyne) has previously been shown to be a high-purity, high-yield precursor to stoichometric silicon carbide. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 112: 3519-3521, 2009
Synthesis, crosslinking, and characterization of energetic polymers through the azidification of glycidyl ether prepolymers
Kara, S; Ozturk, E; Polat, K; Alyuruk, K (Wiley, 2004-03-15)
Low-molecular-weight atactic poly(propylene oxide) and poly(epichlorohydrin) (PECH) were chlorinated on average up to 4.42 chlorine atoms per repeat unit. A study of the products showed that chlorine substitution preferentially occurred on already chlorinated repeat units, yielding chlorine -rich and chlorine -poor sequences. As the extent of chlorine substitution increased, the glass-transition temperature of the polymers markedly increased, and their solubility in most of the organic solvents drastically ...
Citation Formats
E. Akinay and T. Tincer, “Radiation grafting of vinyl monomers onto poly(tetrafluoroethylene) powder produced by gamma irradiation and properties of grafted poly(tetrafluoroethylene) filled low density polyethylene,” JOURNAL OF APPLIED POLYMER SCIENCE, pp. 816–826, 2001, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/65446.