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Description of ASTM-D7131 2009ASTM D7131 - 09Standard Test Method for Determination of Ion Exchange Capacity (IEC) in Grafted Battery SeparatorActive Standard ASTM D7131 | Developed by Subcommittee: D09.19 Book of Standards Volume: 10.02 ASTM D7131Significance and Use
Nickel-metal hydride (Ni-MH) cells/batteries have a tendency to exhibit high rates of self-discharge that may be caused by contamination within a battery cell. The contamination source has been shown to originate from electrode impurities. Grafted separators can trap and hold these impurities, thus reducing self-discharge rates and enhancing battery quality. This test method determines an ionic exchange capacity that can be used to quantify the level of grafting of a separator. This method is useful for research, quality control, and material specifications. 1. Scope
1.1 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 1.2 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 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.. 1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.4 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. ASTM Standards D123 Terminology Relating to Textiles D1711 Terminology Relating to Electrical Insulation E438 Specification for Glasses in Laboratory Apparatus E1272 Specification for Laboratory Glass Graduated Cylinders Keywords battery separator; grafted polyolefin material; ion exchange capacity; Battery separator; Fibrous nonwoven sheet material; Ion exchange capacity (IEC); Polyolefin fabrics; ICS Code ICS Number Code 29.220.01 (Galvanic cells and batteries in general) DOI: 10.1520/D7131-09 ASTM International is a member of CrossRef. ASTM D7131This book also exists in the following packages...Subscription InformationMADCAD.com ASTM Standards subscriptions are annual and access is unlimited concurrency based (number of people that can access the subscription at any given time) from single office location. For pricing on multiple office location ASTM Standards Subscriptions, please contact us at info@madcad.com or +1 800.798.9296.
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About ASTMASTM International, formerly known as the American Society for Testing and Materials (ASTM), is a globally recognized leader in the development and delivery of international voluntary consensus standards. Today, some 12,000 ASTM standards are used around the world to improve product quality, enhance safety, facilitate market access and trade, and build consumer confidence. ASTM’s leadership in international standards development is driven by the contributions of its members: more than 30,000 of the world’s top technical experts and business professionals representing 150 countries. Working in an open and transparent process and using ASTM’s advanced electronic infrastructure, ASTM members deliver the test methods, specifications, guides, and practices that support industries and governments worldwide. |
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