Davood Zare

New nanostructured matrixes for fibre reinforced composites

Oleg L. Figovsky*
VYSO, Inc. (USA), olf@borfig.com

We have elaborated a new type of network interpenetrated polymer as a matrix of nigh shock resistant reinforced plastics. Using as interpenetrating polymer networks principle in production of composite materials provides a unique possibility to regulate their both micro-and nano-structured properties Formulation of a new class of nanocomposite materials is characterized by the absence of contaminants for a network polymers technology. As a main component of such technology we are using branched (dendro)-aminosilanes that at the first stage are curing agents for many oligomers. Additional hydrolysis of aminosilane oligomers creates the secondary nano-structured network polymer that improves service properties of the compound. By using a principle of forming nanostructure by creating nanoparticles during a technological process from a liquid phase, Polymate has elaborated a few of composites based on different kinds of soluble silicates. Significant increasing of silicate matrix strength and toughness was reached by incorporation of special liquid additives, such as TFS, which effect as a microcrystallizing nucleator on the technological stage and later they colmatage the pores of silicate matrix. Our last elaborations are mainly applying a novel type of soluble silicate contained organic cations, for example, the DABCO ( )-based organic alkali soluble silicate.

The problem of modeling of branched cross-linked structures is one of most complicated in composite science. Most existing composite materials have branched cross-linked structure, and their theoretical study is indispensable for their optimal application in practical needs. Conventional methods of description of branched cross-linked structures are numerical and do not allow solution in the general case. Their application needs complicated and long computing and the physical sense of the obtained results is not always clear. Some researchers try application of classical chain models to branched systems, although such approximation is incorrect and may cause serious errors. The problem of modeling of branched cross-linked structures was recently solved by statistical polymer method. This method is based on the consideration of averaged structures (statistical polymers). In such approximation, all reactions in equilibrium are considered as reactions between statistical polymers. The statistical polymer method was tested directly and indirectly. The direct test comprised the exact reproduction of Trommsdorf effect for non-equilibrium polymers, whereas the indirect test allowed the theoretical interpretation of adsorption isotherms for silica and alumina gels. In all cases, the correlation of experimental and theoretical results was very good. The statistical polymer method allows modeling of composites, e.g. materials based on DABCO-based soluble ammonium silicates. Silica globulas in solution or solid are successfully modeled. Such modeling allows serious reduction (for hundreds-thousands times) of the number of numerical experiments. The proposed statistical polymer method is commendable for description of all kinds of composites with complex structure.

Comments

Natalya January 17, 2008 at 12:25am

Dear Davood Zare
Happy New Year ! :-)
At this moment I am writting my thesis. I am working with conductive polymers, polymer brushes.
But, I am would be happy to know more about biosensors.

Thank you for your offer!
Best wishes
Natalya
Somodi Ferenc January 15, 2008 at 3:27pm

Dear Davood,

Thank you very much for the greetings. I saw your pictures and I realized that you are interested in drug delivery. Please let me offer you a webpage or database wich might be useful to you. My friends work on it. Here it is: http://www.cyclodextrin.net:7777/apex/f?p=157:39:1466104034947382
tial login: guest, pw: guest (as far as I know)
Happy and successful new year for you too!
Best regards!
Ferenc
Georgette January 14, 2008 at 5:55pm

Dear Davood,
Happy, healthy and succesful 2008 for you too! I hope this network will be very useful in the exchange of knowledge in nanotechnology. Let's keep in touch!
Greets,
Georgette
Figovsky Oleg January 14, 2008 at 1:28pm

New nanostructured matrixes for fibre reinforced composites

Oleg L. Figovsky*
VYSO, Inc. (USA), olf@borfig.com

We have elaborated a new type of network interpenetrated polymer as a matrix of nigh shock resistant reinforced plastics. Using as interpenetrating polymer networks principle in production of composite materials provides a unique possibility to regulate their both micro-and nano-structured properties Formulation of a new class of nanocomposite materials is characterized by the absence of contaminants for a network polymers technology. As a main component of such technology we are using branched (dendro)-aminosilanes that at the first stage are curing agents for many oligomers. Additional hydrolysis of aminosilane oligomers creates the secondary nano-structured network polymer that improves service properties of the compound. By using a principle of forming nanostructure by creating nanoparticles during a technological process from a liquid phase, Polymate has elaborated a few of composites based on different kinds of soluble silicates. Significant increasing of silicate matrix strength and toughness was reached by incorporation of special liquid additives, such as TFS, which effect as a microcrystallizing nucleator on the technological stage and later they colmatage the pores of silicate matrix. Our last elaborations are mainly applying a novel type of soluble silicate contained organic cations, for example, the DABCO ( )-based organic alkali soluble silicate.

The problem of modeling of branched cross-linked structures is one of most complicated in composite science. Most existing composite materials have branched cross-linked structure, and their theoretical study is indispensable for their optimal application in practical needs. Conventional methods of description of branched cross-linked structures are numerical and do not allow solution in the general case. Their application needs complicated and long computing and the physical sense of the obtained results is not always clear. Some researchers try application of classical chain models to branched systems, although such approximation is incorrect and may cause serious errors. The problem of modeling of branched cross-linked structures was recently solved by statistical polymer method. This method is based on the consideration of averaged structures (statistical polymers). In such approximation, all reactions in equilibrium are considered as reactions between statistical polymers. The statistical polymer method was tested directly and indirectly. The direct test comprised the exact reproduction of Trommsdorf effect for non-equilibrium polymers, whereas the indirect test allowed the theoretical interpretation of adsorption isotherms for silica and alumina gels. In all cases, the correlation of experimental and theoretical results was very good. The statistical polymer method allows modeling of composites, e.g. materials based on DABCO-based soluble ammonium silicates. Silica globulas in solution or solid are successfully modeled. Such modeling allows serious reduction (for hundreds-thousands times) of the number of numerical experiments. The proposed statistical polymer method is commendable for description of all kinds of composites with complex structure.
Figovsky Oleg January 14, 2008 at 1:26pm

Dear Davood Zare,
About which problems would like you talk?
Risk Assessment - ?
Best regards,
Oleg
dr George Kaptay January 1, 2008 at 9:32pm

Dear Davood Zare,

You are welcome. Please, let me know your problems/questions so I can try to answer/comment them.

With my best,

George

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