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Polymer Blend / Polymer Alloy Technologies
Polymer blend and polymer alloy technologies
enable two or more polymers to be combined using
the physical and chemical mutual interactions of
the polymers to realize new properties and levels
of performance that were not possible with the
individual polymers themselves.
At Nitto Denko we use polymer blend
and polymer alloy technologies in the manufacture
and development of film substrates, adhesive tape
and a range of functional materials with various
properties.
- Development of Low-Stress Type Semiconductor Encapsulating Materials using Polymer Blending
- Manufacture of Ion Conducting Membrane using Graft Polymerization
Development of Low-Stress Type Semiconductor Encapsulating Materials using Polymer Blending
Semiconductors are referred to as the heart
of electronics. While semiconductor encapsulating
materials using epoxy resin as their main ingredient
protect semiconductor chips from external force
and contamination, there are demands to minimize
the stress resulting from differences in the modulus
of elasticity and linear expansion coefficient
between semiconductor chips and encapsulating
resin in order to be able to cope with the latest
high density, fine pitch chips.
At Nitto Denko we are engaged in
the development of low-stress type semiconductor
encapsulating materials using polymer blend and
polymer alloy technologies.
Technology Overview
A sea-island structure is used with a continuous layer of hard epoxy resin (sea) and a non-continuous layer (island) of soft silicone resin.
The stress produced by differences in the linear expansion coefficient of the semiconductor chip and the epoxy resin is absorbed by the soft non-continuous layer (island) in order to reduce the stress on the semiconductor chip.
Key Technology
- Controlling the compatibility of materials comprising the sea and island layers.
- Controlling the size of islands.
Manufacture of Ion Conducting Membrane using Graft Polymerization
In the same way as with a grafted tree, graft
polymerization is used to graft a branch polymer
into a main polymer making it is possible to combine
the functions possessed by both polymers or to
create novel functions.
At Nitto Denko, by grafting an
acrylic monomer into a hydrophobic polyethylene
film we provided it with hydrophilic properties.
The starting point for graft polymerization is
to irradiate polyethylene film with an electron
beam in order to produce radicals. Graft polymerization
is then carried out. By controlling graft polymerization
conditions it is possible to manufacture an even
ion conducting membrane.
This graft polymerization ion conducting
membrane is used in silver oxide battery separators.
Separators
and silver oxide batteries using graft polymerization
technology
Relationship
between graft polymerization and film resistance
Raising the graft rate increases ion conductivity.
In this way it is possible
to achieve both chemical stability and mechanical
strength, as well as ion conductivity in the
polyethylene.
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