State Institute Of Technology
Laboratory Of Polymer's Physics
Among the major demands made on epoxy glues and compounds are high adhesion, thermo- and moisture resistance, low viscosity mix, low temperature and rapid cure at long pot life etc. Most part of these requirements is difficult to satisfy simultaneously. So, the small viscosity causes strong contraction, i.e. large mechanical strains, drop in the electrical characteristics, fragility, small thermal conductivity. The cure at room temperature does not provide optimal mechanical, thermal and electrical properties. Therefore choosing of required composition almost always is the compromise agreement of the consumer.
In the creation of optically
epoxy compositions it is necessary to solve, at least, two problems: the
production of high light transmission nearby fundamental absorption band and
necessary spectral properties in visual region. The majority of starting
components manufactured by a domestic industry have low optical quality,
and the bathochromic shift of transmission boundary as a result of
cure can reach 30- 50 nm. Assortment of organic dyes shaping a given spectrum
and minimum interacting with components of epoxy composition, and
also offering necessary thermo- and photo stability, is rather restricted .
The specified problems are successfully solved in Laboratory of polymer's physics of the St.-Petersburg State Institute of Technology [Technical University]. Here by development, investigation and production of optically transparent epoxy compositions are engaged since 1978. The specialists of Laboratory published more four tens scientific papers and defended 11patents.
Low residual stress and viscosity developed glues and compounds are provided with application of the special modifying additives. They contain epoxy groups involving in the reaction of polymerization, and allow directionally to change rheological, physical-mechanical and thermal properties of epoxy compositions. Special cleaning of starting materials, and also individual approach to a choice of composition and cure schedule have allowed to create a range of optical transparent epoxy compounds, optical glues, polymeric light filters with a wide spectrum of areas of application, including:
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