ASTM D 7131 Standard Test Method for Determination of Ion Exchange Capacity (IEC) in Grafted Battery Separator
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ASTM D 7131 Document Information:
Title
Standard Test Method for Determination of Ion Exchange Capacity (IEC) in Grafted Battery Separator
ASTM International
Publication Date:
Mar 1, 2005
Scope:
This test method evaluates an important characteristic of polyolefin
or other fibrous nonwoven
sheet material intended for use in alkaline battery separator
applications. The hydrophilic
properties of the material are enhanced by grafting a functional group
onto the polyolefin, and
this test method is the primary test method to determine the treatment
level, that is, level of
monomer grafted to the base polymer. This test method can also be used
for film or membranes
This test method is intended primarily for testing copolymer-grafted
polyolefin materials used as
battery separators, but could be used for any grafted material. These
separators have
radiation-initiated grafting of acrylic acid monomer (for example)
onto a polyolefin base-web
material to generate hydrophilic sites on the material. This process
is a very good method for
surface modification of polymer materials, and is used to make
separators hydrophilic. Grafting can
be accomplished by irradiation on common polymers such as
polyethylene, polypropylene and
fluoropolymers with various forms of energy, such as UV, gamma rays,
electron beams (EB) or
X-rays..
The values stated in SI units are to be regarded as the standard.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and to determine the applicability of regulatory
limitations prior to use.
Keywords:
- battery separator
- grafted polyolefin material
- ion exchange capacity
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