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  • 1
    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
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  • 2
    Electronic Resource
    Electronic Resource
    Preparation of Nano-Silica/Polypropylene Composites Using Reactive Compatibilization (2006)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 312 (June 2006), p. 229-232 
    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: Nano-sized silica particles were pre-grafted with poly(glycidyl methacrylate) (PGMA) by solution free-radical polymerization. When these grafted silica nanoparticles were melt compounded with polypropylene (PP), reactive compatibilization effect was perceived due to the chemical bonding between the grafted PGMA and amine functionalized PP, which led to a significant increase of tensile strength and notch impact strength of PP at rather low filler content.Accordingly, compatibility of each kind of the functionalized PP with grafted SiO2 nanoparticles was evaluated through investigating the mechanical properties, crystallization behavior and rheological performance of the composites. The results show that the reactive compatibilization is capable of providing stronger interfacial adhesion
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/51/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.312.229.pdf
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  • 3
    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
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  • 4
    Electronic Resource
    Electronic Resource
    Drawing-Induced Dispersion of Nanoparticles and its Effect on Structure and Properties of Thermoplastic Nanocomposites (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 717-720 
    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: To prepare polymer nanocomposites with enhanced performance, well dispersion ofnanoparticles in matrices is necessary. In this work a new route that combines graft pre-treatment anddrawing technique with melt mixing was applied. That is, nano-SiO2 particles were firstly modifiedby graft polymerization and then the grafted nanoparticles were melt-compounded withpolypropylene (PP) producing composites filaments via drawing. Finally, the filaments were injectionmolded into bulk materials. The resultant PP based nanocomposites are much tougher than theunfilled polymer as characterized by either static or dynamic test, besides showing a simultaneousincrease in strength and stiffness. Morphology studies indicated that drawing induced extension andseparation of the grafted nano-silica agglomerates in PP matrix during making the filaments arefrozen to a certain extent after nanocomposites manufacturing. In this way, the nanoparticles are welldistributed in the matrix and correlated with each other throughout the entire composites, which mightensure an overall improvement of mechanical properties. Besides, β-crystal of PP developed in thedrawing process can be retained in the nanocomposites, which also contributes to the toughening ofPP. In view of these, the proposed drawing aided dispersion of nanoparticles might also be applicableto the preparation of other nanoparticles/polymer composites
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.717.pdf
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  • 5
    Electronic Resource
    Electronic Resource
    Graft Polymerization of p-Vinylphenylsulfonylhydrazide onto Nano-Silica and its Effect on Dispersion of the Nanoparticles in Polymer Matrix (2007)
    s.l. ; Stafa-Zurich, Switzerland
    Key engineering materials Vol. 334-335 (Mar. 2007), p. 729-732 
    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: To promote dispersion of nano-silica in polypropylene (PP), a polymerizable foamingagent p-vinylphenylsulfonylhydrazide was synthesized and grafted onto the nanoparticles viafree-radical polymerization. The results of thermogravimetric analysis (TGA) showed that thesulfonyl hydrazide groups of poly(p-vinylphenylsulfonylhydrazide) acquired the desired thermaldecomposition ability, which might be related to their internal oxidation-reduction. Electronmicroscopy observation indicated that the grafted nanoparticles exhibit greatly improved dispersionin PP owing to the fact that the sulfonyl hydrazine groups on the grafted polymer inside theagglomerates decomposed like blowing agent to form polymer bubbles, leading to rapid inflation ofthe surrounding matrix that pulled apart the agglomerated nanoparticles during melting mixing
    Type of Medium: Electronic Resource
    URL: http://www.tib-hannover.de/fulltexts/2011/0528/01/53/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.334-335.729.pdf
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