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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In this example the transition is less clear than the thermogram of Fig.

Table 1 presents the precision statistics generated from this study as de? Precision and Bias 4 Test Method E speci? It is the responsibility of the user of this standard asym establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

D Practice for Plastics: The temperature calibration points must span the DMA Tg result.

ASTM D7028 – 07(2015)

Generally, the specimen should be centered between the clamp faces and be parallel to the base of the instrument. For example, a linear plot scale will result in a lower value of DMA Tg. The two tangent lines are intersected, and temperature corresponding to this intersection point is recorded as the DMA Tg. Should the results be retained, then these conditions d728 be described in the test report.

The equipment must be calibrated in the same loading mode as will be used for testing, either dual d70028 or three-point bending. Depending on the analyzer, typical specimen size can range from 56 6 4 3 12 6 1 3 2. The span-to-depth ratio, ply orientation, and ply stacking sequence of a specimen with respect to the testing? It s7028 the responsibility of the d70028 of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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These averages allow a relative comparison of the repeatability within laboratory precision and reproducibility between laboratory precision of the DMA Tg test parameters. 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.

ASTM D用DMA测试Tg_百度文库

Aatm standard is subject to revision at any time by the responsible technical committee and must be reviewed every? The same heating rate shall be used for all samples whose results are to be compared. Using this approach the intersection point is drawn as shown in Fig.

If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.

Measure the specimen length to 0. Other loading modes such as tensile, torsion or shear may produce different test results. If another equipment type or loading mode is used the non-standard approach shall be described in the report and the test result recorded as non-standard.

Other materials, such as neat resin, may require non-standard deviations from this test method to achieve meaningful results. This could indicate that the sample was taken from a defective portion of the laminate. If the testing is part of a designed experiment, other sampling techniques may be used if described in the test plan.

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A non-standard DMA Tg de?

Interpretation of Results Current edition approved Dec. Work Item s – proposed revisions of this standard. If the two tangent lines are constructed from temperatures too close to the transition, the intersection is depicted as shown in Fig. Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. Allow the oven to cool before removing the specimen.

Atsm is possible that more than one transition exists, but this should be con? If a non-standard frequency, or aastm resonance asrm, is used, the non-standard approach shall be described in the report and the test result recorded as non-standard.

Weigh the specimen to the nearest milligram 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.

Opposite surfaces must be essentially parallel ast, intersecting surfaces perpendicular. Instrumentation manufacturer recommendations should be followed.