A commercial acrylic bone cement was modified by the incorporation of different weight fractions polycrystalline hydroxyapatite (HA), and formulation investigated. The influence filler proportion on flow characteristics mechanical behavior resultant composite evaluated. residual monomer present in cured materials measured gas chromatography. comparison cements with without reinforcement demonstrated that degree polymerization not affected addition HA. Porosity morphology analyzed optical...

Samples were prepared by addition of a fluorinated poly(aryl ether ketone) (12F-PEK) to commercial epoxy resin and curing at either 24 °C or 70 °C. The concentrations fluoropolymer in the samples 0, 5, 10, 20, 30, 40, 50%. Phase inversion facilitates formation more smooth surfaces for scratch testing with increasing concentration. A progressively load from 0.03 N 12 was administered diamond tip samples; depths determined within ±7.5 nm. original depth is function Scratch recovery (healing)...

Load separation is the theoretical basis for single-specimen J-integral experiment and incremental calculation of crack growth resistance (J-R) curves. This criterion has been experimentally studied in nongrowing records several materials, more recently a new method to extend applicability growing experiments proposed testing steel. article examines load evaluating ductile fracture mechanics parameters rubber-modified polystyrenes thermally treated polypropylene bending configuration. allows...

Through this article, the degree of polymerization attainable in a commercial acrylic bone cement based on poly(methyl methacrylate) (PMMA) was investigated by differential scanning calorimetry (DSC) and gas chromatography (GC). The results obtained revealed marked dependence between maximum monomer conversion cure temperature. Specimens for mechanical evaluation were subjected to two different conditions: one set samples allowed at room temperature an additional also postcured 140°C 2 h....

Abstract Antifouling epoxy resin serves as a member of advanced nanocomposite coatings and engineered surfaces. Nevertheless, developing an antifouling composites is state‐of‐the‐art technology. Herein, complex nanostructure tailored to be served additive giving the characteristics resin. F‐POSS@HNT hybrid nanostructure, that is, halloysite nanotubes (HNTs) decorated with fluorinated polyhedral oligomericsil sesquioxane (F‐POSS), was synthesized characterized. Chemical structure changes,...

Abstract A novel fluorinated thermoplastic (FT) was synthesized from diglycidyl ether of bisphenol (DGEBA), and 3‐(trifluoromethyl)aniline. FT found to be miscible with DGEBA as shown by the existence a single glass transition temperature ( T g ) within whole composition range. On basis several experimental techniques, it that upon heating etherification reaction takes place between DGEBA. DGEBA‐aromatic diamine (4,4′‐methylenebis(3‐chloro 2,6‐diethylaniline) formulation modified FT. The...

ABSTRACT Halloysite nanotubes (HNTs) have attracted a technologic and scientific attention as reinforcements of epoxy‐based nanocomposites. However, their reported interaction with epoxy matrices is varied the controlled dispersion HNTs still challenge. In this work, we study effect chemical reactions taking place in process halloysite possible influence composite's properties. HNTs' surface was modified through an alkaline treatment by grafting two aminosilanes different chain lengths...

ABSTRACT The influence of the surface chemical modification on bulk behavior epoxy based networks has been studied. In particular, dynamics epoxy‐amine modified with fluorinated side chains characterized by means broadband dielectric spectroscopy (BDS), differential scanning calorimetry (DSC) and Fourier transform infrared (FTIR) spectroscopy. fluorination effect structure materials related observed changes in both segmental secondary relaxations. An acceleration as degree increases clearly...

Abstract Summary: Fluorinated polyurethane films were obtained from 5‐isocyanato‐1‐(isocyanatomethyl)‐1,3,3‐trimethyl‐cyclohexane (IPDI) and polyethylene oxide (PEO), employing two monoalcohols with different chain lenghts as fluorinated modifiers, 1H,1H,2H,2H‐tridecafluoro‐1‐n‐octanol (EA600) 1H,1H,2H,2H‐heptadecafluoro‐1‐n‐decanol (EA800). X‐ray photoelectron spectroscopy (XPS) has demonstrated that fluorine surface enrichment takes place. Atomic force microscopy (AFM) was employed in...

Abstract Physical and water aging of glass/epoxy composite — GFRE pipes used for oil transport were investigated with special emphasis on their effect the flexural impact behavior. Different conditions selected in order to simulate in-service environments trying obtain reliable results from accelerated laboratory tests. In uptake experiments at 80°C, mass increases continuously, suggesting that an irreversible process occurs. addition, samples aged air 80°C exhibit a DSC endothermic peak can...

Abstract Functionalizacion of epoxy‐based networks by the preferential surface enrichment perfluorinated tails to achieve hydrophobic is described. The selected fluorinated epoxies (FE) were: 2,2,3,3,4,4,5,5,6,6,7,7,8,9,9,9‐hexadecafluoro‐8‐trifluoromethyl nonyloxirane (FED3) and 2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,9‐heptadecafluoro (FES3). Two series crosslinked materials containing variable fluorine contents (from 0 5 wt % F ) were prepared using formulations based on partially diamine, epoxy...

By means of electric force microscopy, composition depth profiles were measured with nanometric resolution for a series fluorinated networks. mapping the dielectric permittivity along line going from surface to bulk, we able experimentally access fluorine concentration profile. Obtained data show gradient lengths ranging 30 nm 80 in near area samples containing 0.5 5 wt. % F, respectively. In contrast, no gradients detected bulk. This method has several advantages over other techniques...

Epoxy–anhydride-based polymers are commonly used as a matrix in pipeline systems exposed to water during their in-service life. Water absorption at moderate temperatures and/or long exposure times could lead irreversible hydrolysis reaction decreasing considerably the polymer overall performance. A strategy enhance barrier properties of epoxy resins is add nanofillers traditional matrices. In this work, we added bentonite and chemically modified purpose. resulting materials three different...

Glass fiber reinforced epoxy (GFRE) composite materials are prone to suffer from water absorption due their heterogeneous structure. The main process governing is diffusion of molecules through the matrix. However, hydrolytic degradation may also take place during components service life specially high temperatures. In order mitigate effects diffusive processes in deterioration in-service behavior matrix composites, use chemically modified nanoclays as an additive has been proposed and...

Abstract Two series of trifluoromethylated crosslinked epoxy‐based polymers with different molecular architectures and fluorine contents (from 1 to 5 wt%) have been investigated. The epoxy monomer was a diglycidyl ether bisphenol A, the curing agents were 3‐(trifluoromethyl)aniline 4,4′‐methylenebis(3‐chloro‐2,6‐diethylaniline). structural parameters networks such as gelation vitrification properties resulting fluorinated materials investigated compared. Final showed high transparency an...