New nanocomposite materials for display screens based on light scatering
I Suleimenov, Z Sedlakova, S Panchenko, N Semenyakin, D Shaltykova and Z Tasbulatova
Almaty University of Power Engineering and Telecommunications, Kazakhstan
: J Nanomater Mol Nanotechnol
It is considered a method of synthesis of new polymeric materials providing the high quality optical contact between two planar waveguides contacted mechanicaly. The method is based on the silicate nanoparticles insertion into the polymer matrix by intermediary elements. Materials providing the high quality reversible optical contact can be used in data entry systems with optical encoding (for example, keyboards, mobile phones accessories). In such systems, detection of touchpadâs pressure points is performed by recording the optical signal rolling from one optical fiber to another during the appearance of optical contact. Butylmethacrylate (BMA), and 2-ethylhexyl acrylate (EHA), Aldrich, without further purification, as well as dinitrile azo-bis-izomaslyannoy acid (AIBN) , Aldrich are used for synthesis of polymers which provide the optical contact between the polymer film and polymethylmethacrylate plate. EGA component is inserted into copolymer to improve adhesion of the film to the polymethylmethacrylate. Copolymers of butyl methacrylate and 2-ethylhexyl acrylate were synthesized by free radical copolymerization with AIBN as initiator. Polymerization was in solution of tetrahydrofuran. Cationic modifying compounds obtained by alkylating 2- (dimethylamino) ethyl methacrylate with benzyl bromide in solution of tetrahydrofuran were used for silicate nanoparticles (Products and Nanocor Cloisite 20A - Southern Clay) insertion into the investigated films. It is necessary to use a modifier because the clay Nanocor (substance that ensures the presence of nanoparticles) is natural layered silicate, or rather natural -montmorellonit Na + (MMT), which is hydrophilic and can not be mixed with the polymers on the molecular level. Special unit to record the amplitude of the optical signal as a function of the applied load is used to determine the quality of optical contact. The results showed that the composite materials have appropriate properties to implement optical sensor systems. More precisely, the optical contact appears only at sufficiently high mechanical pressure, and it corresponds to the realization of keyboards (pressure by user's fingers). This can greatly simplify the scheme of keyboards and other sensor systems with optical encoding..