ASTM D7028 PDF

Add Attachments to Content Item ‘ASTM D Glass Transition Temperature ( DMA Tg) of Polymer Matrix Composites by Dynamic Mechanical Analysis (DMA) . ASTM D Glass Transition Temperature (DMA Tg) of Polymer ASTM D has become a widely used test standard in many companies due to. ASTM D用DMA测试Tg_能源/化工_工程科技_专业资料。Designation: D – 07?1 Standard Test Method for Glass Transition.

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Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters. If qstm two tangent lines are constructed from temperatures too close to the transition, the intersection is depicted as shown in Fig.

ASTM D用DMA测试Tg_百度文库

ASTM E Before the transition the storage modulus continues to slope downward and after the transition the storage modulus continues to slope downward. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their d708 responsibility.

A change in heating rate will affect the glass transition temperature result; the standard heating rate is the best available compromise for comparing DMA Tg results of dry and wet laminates. The temperature calibration points must span the DMA Tg result.

Strains of less than 0. If the testing is part of a designed experiment, other sampling techniques may be used if described in the test plan. The equipment must be calibrated in the same loading mode as will be used for testing, either dual cantilever or three-point bending.

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If a non-standard frequency, or the resonance mode, is used, the non-standard approach shall be described in the report and the test result recorded as non-standard. If a different heating rate is used it shall be described in the report and the result recorded as nonstandard.

Other loading modes such as tensile, torsion or shear may produce different test results. A non-standard specimen con? Historical Version s – view previous versions of standard. Opposite surfaces must be essentially parallel and intersecting surfaces perpendicular. Therefore, it is recommended that the test specimens should be weighed before and after DMA Tg testing to quantify the moisture change in the specimen resulting from the DMA Tg test. On the other hand, if the two tangent lines are constructed at temperatures too far away from the transition, the intersection is depicted in Fig.

The span-to-depth ratio, ply orientation, and ply stacking sequence of a specimen with respect to the testing? Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. D Terminology for Plastics: This temperature is designated as TA.

Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. The DMA Tg value is frequently used to indicate the upper use temperature of composite materials, as well as for quality control of composite materials. Sampling and Test Specimens 8. It is standard that one of the major? The DMA Tg is determined to be the intersection of two tangent lines from the storage modulus by this test method.

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Measure the specimen length to 0. In general, for a given material, a higher testing frequency produces a higher DMA Tg value than this standard, while use of the resonance mode will yield a different DMA Tg that may be either higher or lower than the standard.

The temperature at which a signi? Generally, the specimen should be centered between the clamp faces and be parallel to the base of the instrument. If you feel that your comments have not received a fair hearing asfm should make your views known to the ASTM Committee on Standards, at the address shown below.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. The conditioned specimens shall be tested within 30 minutes after removal from the conditioning chamber, or stored in sealed MIL-PRF or equivalent aluminized bag until test. Using this approach the intersection point is drawn as shown in Fig.

Laminate edges or other irregularities created in the laminate by mold or bagging techniques should be avoided. For example, a linear plot scale will result in a lower s7028 of DMA Tg.

ASTM D7028 – 07(2015)

A non-standard DMA Tg de? Other materials, such as neat resin, may require non-standard deviations from this test method to achieve meaningful results.

The values given in parentheses are non-standard mathematical conversions to common units that are provided for information only.