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Home Moldova Technologies Electrophotographic Information Carrier

Electrophotographic Information Carrier

Description


Fig. 1 Structure of thermoplastic copolymer.

Charge- (hole or electron) transport polymeric materials have been widely used in many fields, including electrophotography, organic electroluminescent devices, and others. They also play an important role in electrophotoconductive materials’ elaboration, which attract much interest because of the potential application in holographic optical data storage and real time imaging process. Carbazole containing polymers are also well known for their photorefractive properties. Carbazole containing polymers can be used in production of photothermoplastic materials only in case when they correspond to certain requirements: they must be transparent; they must manifest adhesion for support; and they should possess certain thermo-mechanic and deformational characteristics.

With the purpose to obtain carbazole containing copolymers with improved complex of physical–mechanical properties, the possibility of N-vinylcarbazole copolymerization with higher alkenes – octene-1 (OC-1) and hexadecene-1 (HD-1) has been studied.


Fig. 2 Structure of photosensitive copolymers.

On the basis of the prepared photopolymeric materials there have been developed double-layered photothermoplastic recording media (PTPM carriers). The first layer is the photosensitive one. As the second recording layer there has been used well known thermoplastic materials (TPM) which possess high specific resistance and good deformational properties in corona discharge, namely the copolymer styrene: butylmethacrylate 50:50 mol% (BMA50). The electro-photographic information carrier includes a support, a visualization layer of thermoplastic polymer and an electro-photosensitive layer based on N-vinylcarbazole copolymer sensitized with 2,4,7-trinitrofluorenone. As light sensitive layer there has been used a copolymer obtained from N-vinylcarbazole and a higher alkene 1-octene or 1- hexadecene in the presence of an initiator, taken in the following component ratio, mol %:

  • N-vinylcarbazole 40…60
  • Higher alkene 40…58
  • Initiator 1…2.


Fig. 3 Structure of information carrier.

Innovative Aspect and Main Advantages

  • Photographical sensitivity S = 10-4 – 10-5 J/cm2;
  • Resolution R > 2000 mm-1;
  • Diffraction efficiency η ~ 10%;
  • Vacuum techique is not used in the elaboration process;
  • Lower cost, comparing with known analogues;
  • Ecologically pure.


Fig. 4 An example of holoarray
recorded on two-layer carrier
using a green laser (k = 532 nm).


Fig. 5 A reconstructed
holographical image,
using a red laser.

Areas of Application

Opto-electronics, photonics, holography, protection of different documents and products.

Stage of Development

Patented.

Contact Details

Moldova State University
Contact person: Dr. Stefan Robu
Address: 60, Alexei Mateevici St. Chisinau, MD2009, Republic of Moldova
Tel.: (+373 22) 577 548
Fax: (+373 22) 244 248
E-mail: This e-mail address is being protected from spambots. You need JavaScript enabled to view it

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