ALBERT

All Library Books, journals and Electronic Records Telegrafenberg

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
  • 1
    Electronic Resource
    Electronic Resource
    Microstructure and tribological behavior of polymeric nanocomposites (2001)
    Bradford : Emerald
    Industrial lubrication & tribology 53 (2001), S. 72-77 
    Details
    ISSN: 0036-8792
    Source: Emerald Fulltext Archive Database 1994-2005
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Nanocomposites represent a new prospective branch in the huge field of polymer materials science and technology. It has been shown that an overall enhancement of properties of polymers can be achieved under certain conditions by the addition of nanoparticles. To examine the influence of microstructure on the tribological performance of nanocomposites, different ways of compounding were used in this study. It was found that the friction and wear behavior of polymeric nanocomposites under sliding environment was rather sensitive to the dispersion states of the nanoparticles. When the microstructural homogeneity of the nanocomposites was improved, their wear resistance could be increased significantly. The present work demonstrates the importance of TiO2-nanoparticles dispersion in an epoxy resin matrix, on the materials' tribological properties, when sliding against a smooth steel counterpart.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1108/00368790110383993
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Natural Fiber Reinforced Plastic Foams from Plant Oil-Based Resins (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 149-152 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In this work, a simple but effective approach was reported for preparing natural fiberreinforced plastic foams based on plant oil with excellent compressive performance andbiodegradability. Firstly, epoxidized soybean oil (ESO) was converted into its acrylate ester AESO,which can be free-radically copolymerized with reactive diluents like styrene to give thermosettingresins and their foam plastics. Then the bio-foam composites were produced using short sisal fiber asthe reinforcement. Effects of fiber loading, length and surface treatment on properties of the foamcomposites were investigated. It was found that exposure of the fibers to gas cells of the foam reducedthe effectiveness of interfacial effect, which is different from conventional bulk composites. As aresult, reinforcing ability of sisal fibers became a function of fiber length, loading, etc. Furthermore,the plastic foams based on plant oil resin were proved to be biodegradable in soil burial or in thepresence of fungi
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.149.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Self-Healing of Cracks in Epoxy Composites (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 282-285 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: To provide epoxy based composites with self-healing ability, two-component healingsystem consisting of urea-formaldehyde walled microcapsules containing epoxy (30~70µm indiameter) and CuBr2(2-MeIm)4 (the complex of CuBr2 and 2-methylimidazole) latent hardener wassynthesized. When cracks were initiated or propagated in the composites, the neighbormicro-encapsulated epoxy would be damaged and released. As the latent hardener is soluble in epoxy,it can be well dispersed in epoxy composites during composites manufacturing, and hence activate thereleased epoxy wherever it is. As a result, repair of the cracked sites is completed through curing ofthe released epoxy. The present work indicated that the plain weave glass fabric laminates using theabove self-healing epoxy as the matrix have been provided with self-healing capability
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.282.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 4
    Electronic Resource
    Electronic Resource
    Preparation and Characterization of a Novel Flame Retardant (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 294-297 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: A novel flame retardant polymethylsilsesquioxane (PMSQ) was successfully obtained viacombination of non-hydrolytic and hydrolytic sol-gel routes. Chemical structure of the resultantPMSQ was determined by nuclear magnetic resonance spectroscopy, Fourier-transform infraredspectrometry and powder X-ray diffraction, respectively. All the measurements demonstrated that theproduct possessed regular structure with chain-to-chain width of 0.87nm and chain thickness of0.40nm. Weight average molecular weight of PMSQ was measured to be 3.5×105 using gelpermeation chromatography. Numerical simulations of the molecular structure suggested that PMSQshould exhibit cis-isotactic configuration and double helical conformation at undisturbed condition
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.294.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 5
    Electronic Resource
    Electronic Resource
    Melamine Resin-Walled Microcapsules Containing Styrene: Preparation and Characterization (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 286-289 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: For purposes of developing a novel self-healing chemistry for polymer composites,melamine-formaldehyde (MF) resin-walled microcapsules containing styrene were prepared byin-situ polymerization in an oil-in-water emulsion. Chemical structure of the microcapsules wasidentified by Fourier-transform infrared spectroscopy (FTIR) and proton magnetic resonancespectroscopy (1H NMR), respectively. In addition, scanning electron microscope (SEM) and opticalmicroscope (OM) were used to investigate morphology and geometry of the product. The effects ofdispersion rate, weight ratio of core to shell and emulsifier concentration were carefully analyzed. Itwas found that poly(melamine-formaldehyde) (PMF) microcapsules containing styrene weresuccessfully synthesized through the proposed technical route, and their mean diameters fall in therange of 20~71 µm. The rough surface of the microcapsules is composed of agglomerated PMFnanoparticles. Both core content and size of the microcapsule can be adjusted by selecting differentprocessing parameters. The highest loading of styrene in the capsules is about 60% and the emulsifierwith lower molecular weight used to result in higher core content. In terms of differential scanningcalorimetry (DSC) and thermogravimetric analysis (TGA), thermal behavior and storage stability ofthe capsules were studied. The results indicated that the microcapsules can be handled up to 72 oC
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.286.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 6
    Electronic Resource
    Electronic Resource
    Synthesis and Characterization of a Novel Epoxy with Improved Processability (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 290-293 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: For purposes of developing a novel epoxy with low viscosity and high activity,N,N-diglycidyl-furfurlamine (DGFA) was successfully synthesized through a two-step reactionbetween 2-furfurylamine and epichlorohydrin involving ring-opening and ring-closure mechanisms.The product structure was verified by FTIR, 1H-NMR, 13C-NMR and elemental analysis,respectively. Its viscosity was found to be 0.02 Pa·s at 25oC. To understand its curing behavior,exothermic habit of the model mixture of DGFA and the curing agent methylhexahydrophthalicanhydride (MHHPA) at stoichiometric ratio of epoxy ring/anhydride of 1:0.8 was inspected withDSC. By changing the heating rates from 2.5 to 15oC/min, activation energy for consolidation of theresin was estimated to be 46.2 kJ/mol, which is much lower than the value involved in curing ofdiglycidyl ether of bisphenol A catalyzed by anhydride. Besides, thermal decomposition performanceof cured version of the newly synthesized epoxy was also examined. The predominant pyrolysis tookplace at around 330-390oC as a result of chain scission of epoxy. The cured resin possessescomparable mechanical properties as conventional diglycidyl ether of bisphenol A. Its flexuralstrength and modulus are 111MPa and 3.6GPa, respectively. Evidently, the resultant epoxy isprovided with balanced properties for practical applications
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.290.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 7
    Electronic Resource
    Electronic Resource
    Preparation and Properties of Nano-SilicaFilled Self-Reinforced Polypropylene (2008)
    s.l. ; Stafa-Zurich, Switzerland
    Advanced materials research Vol. 47-50 (June 2008), p. 318-321 
    Details
    ISSN: 1662-8985
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: To improve the properties of polypropylene (PP), a new route that combines nanoparticlesfilling with self-reinforced technique was applied in this work. That is, nano-silica particles werefirstly modified by graft polymerization to increase interfacial interaction between nanoparticles andmatrix. Then the grafted nanoparticles were melt-compounded with PP producing composites sheets,and the sheets were stretched under a temperature slight lower than the melt point of PP at a constantvelocity. Finally, the stretched sheets were film-stacked with random PP copolymer by a specialdesigned mold and were hot pressd at different processing temperature (T=150-175˚C) and holdingpressure (2.0-5.0MPa) under constant holding time of 5min. The resultant self-reinforcednanocomposite are much stronger and stiffer than the unfilled polymer as characterized by mechanicaltest. The results show that the optimum processing conditions for hot consolidation are 160˚C and2.5MPa. Addition of nanoparticles increases crystallinity of PP, and induces the formation of crazeand cause much more surrounding matrix polymer to involve in large-scale plastic deformation,which might ensure an overall improvement of mechanical properties
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/40/transtech_doi~10.4028%252Fwww.scientific.net%252FAMR.47-50.318.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 8
    Electronic Resource
    Electronic Resource
    Reactive Compatibilization in Nano-Silica Filled Polypropylene Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Solid state phenomena Vol. 121-123 (Mar. 2007), p. 1433-1436 
    Details
    ISSN: 1662-9779
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Physics
    Notes: Nano-sized silica was pre-grafted with poly(glycidyl methacrylate) (PGMA) by solutionfree-radical polymerization. When these grafted silica particles were melt compounded withpolypropylene (PP), reactive compatibilization effect was perceived due to the chemical bondingbetween the PGMA and amine functionalized PP, which led to a significant increase of tensilestrength and notch impact strength of PP at rather low filler content. Accordingly, compatibility ofeach kind of the functionalized PP with grafted SiO2 was evaluated through investigating themechanical properties, crystallization behavior and rheological performance of the composites. Theresults show that the reactive compatibilization is capable of providing stronger interfacial adhesion
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/02/23/transtech_doi~10.4028%252Fwww.scientific.net%252FSSP.121-123.1433.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 9
    Electronic Resource
    Electronic Resource
    In Situ Crosslinking Induced Structure Development and Mechanical Properties of Nano-Silica/Polypropylene Composites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 733-736 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: In our previous works, a double percolation mechanism of stress volumes was proposed toexplain the special effects generated by small amounts of grafted nanoparticles. Accordingly, it isinferred that strengthening nanoparticle agglomerates and enhancing nanoparticles/polymer matrixinterfacial interaction are the key issues to improve mechanical performance of the matrix polymer.To confirm this idea, in-situ crosslinking was adopted to prepare nanocomposites by adding reactivemonomers and crosslinking agents during melt compounding of nano-silica with polypropylene (PP).It was found that the grafted polymer chains were successfully crosslinked and chemically bonded tothe nano-silica forming crosslinked networks. Meanwhile, matrix molecular chains penetratedthrough the networks to establish the so-called semi-IPN structure that interconnected nanoparticlesby the networks and improved filler/matrix interfacial interaction. As a result, the tiny nanoparticleswere well distributed in the matrix and the toughening and reinforcing effects of the nanoparticles onthe matrix were brought into play at rather low filler loading, as evidenced by mechanicalperformance tests. Besides, β-crystal was detected in the nanocomposites experienced in-situcrosslinking reaction
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.733.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 10
    Electronic Resource
    Electronic Resource
    Synergistic Toughening Effects of Nano-CaCO〈sub〉3〈/sub〉 and POE on Ternary-Phase Polypropylene Nanocomposites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 553-556 
    Details
    ISSN: 1013-9826
    Source: Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Notes: Microstructure and mechanical properties of ternary PP/POE/nano-CaCO3 compositeswere investigated. Two different phase structures were obtained mainly by adjusting processingsequence. The one-step process led to the isolated distribution of elastomer and CaCO3 particles in PPmatrix, while the two-step one attained an encapsulated microstructure. In comparison with binaryblends of PP/POE or pure PP, toughness of the ternary composites was significantly increased.Meanwhile, their stiffness and tensile strength kept nearly unchanged or slightly enhanced, implyingthat there is a synergistic effect between nano-CaCO3 and POE components
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.553.pdf
    Location Call Number Expected Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...