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排序方式: 共有72条查询结果,搜索用时 15 毫秒
61.
Aida Benhamida Mustapha Kaci Sossio Cimmino Clara Silvestre Donatella Duraccio 《大分子材料与工程》2010,295(3):222-232
The present paper is aimed to evaluate the efficiency of two masterbatches, i.e., EBAGMA/LDPE (MB1) and EBAGMA/PET (MB2) with 50/50 w/w composition, prepared by melt mixing and used as new compatibilizers for blends of LDPE/PET. The morphology, the mechanical and the thermal properties of LDPE/PET/MB1 and LDPE/PET/MB2 ternary blends have been investigated. Morphological investigation by SEM of LDPE/PET/MB1 ternary blends showed a finer dispersion of PET in LDPE matrix with a better interfacial adhesion compared to those of both LDPE/PET/MB2 and binary LDPE/PET blends. The results also indicated a substantial improvement in both elongation at break and impact strength, while the Young's modulus decreased. Moreover, the thermal properties showed a decrease of the crystallization phenomena of PET in LDPE/PET/MB1 blend, thus confirming the good dispersion of PET particles into the continuous phase of LDPE matrix, leading to the conclusion that MB1 could be an efficient compatibilizer for LDPE/PET system.
62.
Amar Boukerrou Jannick Duchet Said Fellahi Mustapha Kaci Henry Sautereau 《应用聚合物科学杂志》2007,103(6):3547-3552
The morphology and mechanical and viscoelastic properties of rubbery epoxy/organoclay montmorillonite (MMT) nanocomposites were investigated with wide‐angle X‐ray scattering (WAXS), transmission electron microscopy (TEM), tensile testing, and dynamic mechanical thermal analysis. An ultrasonicator was used to apply external shearing forces to disperse the silicate clay layers in the epoxy matrix. The first step of the nanocomposite preparation consisted of swelling MMT in a curing agent, that is, an aliphatic diamine based on a polyoxypropylene backbone with a low viscosity for better diffusion into the intragalleries. Then, the epoxy prepolymer was added to the mixture. Better dispersion and intercalation of the nanoclay in the matrix were expected. The organic modification of MMT with octadecylammonium ions led to an increase in the initial d‐spacing (the [d001] peak) from 14.4 to 28.5 Å, as determined by WAXS; this indicated the occurrence of an intercalation. The addition of 5 phr MMTC18 (MMT after the modification) to the epoxy matrix resulted in a finer dispersion, as evidenced by the disappearance of the diffraction peak in the WAXS pattern and TEM images. The mechanical and viscoelastic properties were improved for both MMT and MMTC18 nanocomposites, but they were more pronounced for the modified ones. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 103: 103: 3547–3552, 2007 相似文献
63.
Mustapha Kaci Naima Touati Radu Setnescu Traian Zaharescu Tanta Setnescu Silviu Jipa 《大分子材料与工程》2005,290(8):802-808
Summary: In this paper, the grafting of a hindered amine stabilizer (HAS) is studied in isotactic poly(propylene) (PP) films under γ‐irradiation. The HAS used has a definite structure that combines a hindered amine functionality and a UV‐absorbing unit (benzylidene malonate ester group) detectable at 308 nm in the UV spectrum of PP film and 314 nm in chloroform. The stabilizer is added to the polymer at various concentration ratios: 0.1, 0.2, and 0.3 wt.‐%. The percentage of HAS grafting in the PP film at various additive concentrations is determined as a function of γ‐radiation dose in the range of 0–100 kGy by direct spectroscopic measurements through the absorption band of the stabilizer in the UV spectra of the PP film. The percentage of free HAS extracted with chloroform from the PP film versus the radiation dose is determined by UV spectroscopy for all the additive concentrations used. This study reveals that only 80% of the HAS is grafted on the 100 kGy irradiated PP matrix independent of the additive concentration used. However, the percentage of HAS grafted on PP films displays an exponential dependence on γ‐radiation dose. These results are consistent with the data obtained on the free HAS content. γ‐Irradiation grafting of HAS in the PP is accompanied by the oxidative degradation of the polymer substrate that is evaluated by increasing the carbonyl index and reducing significantly the oxidation induction time of the PP films.
64.
Allel Hadjali Souhila Kaci Henri Prade 《Annals of Mathematics and Artificial Intelligence》2011,63(3-4):357-383
The paper presents a new approach to database preference queries, where preferences are represented in a possibilistic logic manner, using symbolic weights. The symbolic weights may be processed without assessing their precise value, which leaves the freedom for the user to not specify any priority among the preferences. The user may also enforce a (partial) ordering between them, if necessary. The approach can be related to the processing of fuzzy queries whose components are conditionally weighted in terms of importance. In this paper, importance levels are symbolically processed, and refinements of both Pareto ordering and minimum ordering are used. The representational power of the proposed setting is stressed, while the approach is compared with database Best operator-like methods and with the CP-net approach developed in artificial intelligence. The paper also provides a structured and rather broad overview of the different lines of research in the literature dealing with the handling of preferences in database queries. 相似文献
65.
V��ctor M��ndez Mu?oz Gabriel Amor��s Vicente Mohammed Kaci 《Journal of Grid Computing》2011,9(3):345-354
The LHC Computing Grid (LCG) leads by CERN, has solved with the LCG File Catalog (LFC) the major problem of scaling the data
management catalog. However, additional performance issues should be faced to deploy a painless catalog service. With this
aim, we present a decentralized LFC server configuration, and its performance evaluation compared with the traditional LFC
deployment. A performance analysis is shown, including not only the catalog server, but also analysing the client side overhead.
We find that the LFC service has in the clients a relevant workload of the overall service. The experimental results show
that the proposed LFC deployment for servers and clients, improves the performance of the service. 相似文献
66.
Mustapha Kaci Aida Benhamida Sossio Cimmino Clara Silvestre Cosimo Carfagna 《大分子材料与工程》2005,290(10):987-995
Summary: This work is aimed at studying the morphology and the mechanical properties of blends of low density polyethylene (LDPE) and poly(ethylene terephthalate) (PET) (10, 20, and 30 wt.‐% of PET), obtained as both virgin polymers and urban plastic waste, and the effect of a terpolymer of ethylene‐butyl acrylate‐glycidyl methacrylate (EBAGMA) as a compatibilizer. LDPE and PET are blended in a single screw extruder twice; the first extrusion to homogenize the two components, and the second to improve the compatibilization degree when the EBAGMA terpolymer is applied. Scanning electron microscopy (SEM) analysis shows that the fractured surface of both the virgin polymer and the waste binary blends is characterized by a gross phase segregation morphology that leads to the formation of large PET aggregates (10–50 µm). Furthermore, a sharp decrease in the elongation at break and impact strength is observed, which denotes the brittleness of the binary blends. The addition of the EBAGMA terpolymer to the binary LDPE/PET blends reduces the size of the PET inclusions to 1–5 µm with a finer dispersion, as a result of an improvement of the interfacial adhesion strength between LDPE and PET. Consequently, increases of the tensile properties and impact strength are observed.
67.
Bowen KR Flanagan KB Acree WE Abraham MH Rafols C 《The Science of the total environment》2006,371(1-3):99-109
The narcotic and lethal concentrations of organic compounds have been compiled for several tadpole species (Rana temporaria, Rana pipiens, Rana japonica, Xenopus laevis and Rana brevipoda porosa). The narcotic and lethal concentrations have been correlated using the Abraham solvation parameter model to yield an equation that can be used to predict the narcotic concentrations of additional nonpolar and polar narcotic compounds to R. temporaria, and a more general correlation that should be applicable to different species of tadpoles. The more general equation is based on 240 experimental data points. A training set of 123 compounds could be fitted with the Abraham solvation parameters with R(2)=0.931 and S.D.=0.343 log units. The training equation predicted the test set of 122 values with AE=-0.022 log units, S.D.=0.300 log units and an average absolute error, AAE, of 0.227 log units. The structural features that are important in narcosis of tadpoles have been examined; it is concluded that hydrogen bond basicity reduces narcotic activity of compounds and that compound size increases narcotic activity. The solvation parameter model enables narcosis of tadpoles to be compared to various other biological processes and to physicochemical processes that might be used as models for narcosis. 相似文献
68.
Three-dimensional nonlinear finite element model of reinforced concrete beam has been developed in this study. The general
purpose finite element package, ANSYS 8.0, is employed for the numerical analyses. Using SOLID65 solid elements, the compressive
crushing of concrete is facilitated using plasticity algorithm while the concrete cracking in tension zone is accommodated
by the nonlinear material model. Smeared reinforcement is used and introduced as a percentage of steel embedded in concrete.
Comparison with hand calculated results is presented for the concrete beam. Convergence of analytical results is showed. The
capability of the model to capture the critical crack regions, loads and deflections for various types of loadings in reinforced
concrete beam has been illustrated. 相似文献
69.
Souhila AbaciBelkacem Nessark Rabah BoukherroubKamal Lmimouni 《Thin solid films》2011,519(11):3596-3602
The analysis of the electrochemical and spectroscopic properties of a composite material obtained starting from the polyaniline and TiO2 in H2SO4 medium, using cyclic voltamperometry, shows three redox couples characteristic of the different oxidation and reduction states of produced polymer. The electroactivity of the composite in acid medium was better than that obtained in basic medium. The impedance spectroscopy study shows that the resistance of the film increases with the aniline concentration, but is not significantly affected by the amount of TiO2 incorporated in polymer. The increase of pH decreases the resistance of the films and consequently increases its conductivity. 相似文献
70.
Boussaa S. Anas Benfadel K. Khodja A. Trad Ayachi M. Boulil R. Bekhedda K. Talbi L. Boukezzata A. Ouadah Y. Allam D. Maifi L. Keffous A. Chetoui A. Torki C. Boudeffar F. Achacha S. Manseri A. Boutarek N. Zaourar Kaci S. 《SILICON》2023,15(3):1145-1157
Silicon - Semiconductors as photoelectric catalysis is recognized as a promising strategy for simultaneous face energy crisis and environmental pollution. In this study, amorphous silicon carbide... 相似文献