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

Akinay, AE
Tincer, T
Poly(tetrafluoroethylene) (PTFE) scraps were recovered as a filler material for low-density polyethylene (LDPE) after they were degraded by Co-60 gamma-rays under atmospheric conditions to make small-size powder. The powder PTFE, which was called secondary PTFE (2 degrees-PTFE), was melt mixed with LDPE and then extruded to obtain 200 mu m films. The mechanical and thermal properties and also the morphology of the fractured surface of these 2 degrees-PTFE-filled LDPE were studied. It was found that the addition of 2 degrees-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 degrees-PTFE. However, when it is compared to the addition of virgin PTFE into LDPE, 2 degrees-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 degrees-PTFE. Silane coupling agents were found to enhance the interfacial adhesion between 2 degrees-PTFE and LDPE. The study on the fractured surfaces by scanning electron microscope revealed this adhesion between these two polymers. (C) 1999 John Wiley & Sons, Inc. J Appl Polym Sci 74: 866-876, 1999.


KIREMITCI, M; CUKUROVA, H; Özkar, Saim (Wiley, 1993-01-01)
Crosslinked poly(hydroxyethylmethacrylate) [poly(HEMA)] beads were prepared by the suspension copolymerization of 2-hydroxyethylmethacrylate monomer with ethyleneglycol dimethacrylate (EGDMA) in aqueous media which contained only magnesium oxide (MgO) as a suspension stabilizer and also salting-out agent. The procedure gives spherical particles with narrow size distribution. The reaction mechanism, composition and structure of poly(HEMA) beads were studied by solid-state C-13 CP/MAS NMR, FTIR, ESCA, and ele...
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Poly(amidoamine) (PAMAM) dendrimers are a novel class of spherical, well-designed branching polymers with interior cavities and abundant terminal groups on the surface which can form stable complexes with drugs, plasmid DNA, oligonucleotides, and antibodies. AmineaEuroterminated PAMAM dendrimers are able to solubilize different families of hydrophobic drugs, but the cationic charges on dendrimer surface may disturb the cell membrane. Therefore, surface modification by PEGylation, acetylation, glycosylation,...
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...
gamma-irradiated poly(tetrafluoroethylene) particle-filled low-density polyethylene. II. UV stability of LDPE in the presence of 2 degrees-PTFE powder and silane coupling agents
Akinay, AE; Tincer, T (Wiley, 1999-10-24)
Ultraviolet (UV) stability of gamma-irradiated poly(tetrafluoroethylene), 2 degrees-PTFE, powder-filled low-density polyethylene (LDPE) was studied in this work. The mechanical and thermal properties of 2 degrees-PTFE powder-filled LDPE were discussed in our previous work (Akinay and Tincer, 1999). It already has been shown that silane coupling agents (SCAs) result in improvements in mechanical properties. The UV stability of these samples was followed by a comparision between strain at break measured after...
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 (Wiley, 2001-01-31)
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 -...
Citation Formats
A. Akinay and T. Tincer, “gamma-irradiated poly(tetrafluoroethylene) particle-filled low-density polyethylene. I. Effect of silane coupling agents on mechanical, thermal, and morphological properties,” JOURNAL OF APPLIED POLYMER SCIENCE, pp. 866–876, 1999, Accessed: 00, 2020. [Online]. Available: