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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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. Weigh the specimen to the nearest milligram 0.

It is standard that one of the major? The values given in parentheses are non-standard mathematical conversions d7208 common units that are provided for information only. Interpretation of Results The same heating rate shall be used for all samples whose results are to be compared.

ASTM D7028 – 07(2015)

Terminology D de? A number in parentheses indicates the year of last reapproval. Determination and Report of Procedures. Precision and Bias 4 The two tangent lines are intersected, and temperature corresponding to this intersection point is recorded as the DMA Tg.

Typically the thermocouple should be as close to the sample as possible.

The second tangent line D0728 B, 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. It is possible that more than one transition exists, but this should be con?

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Mount the specimen in dual cantilever mode or three-point bending d028. A meaningful comparison of data requires that the specimen con? Measure the specimen length to 0. The equipment must be calibrated in the same loading mode as will be used for testing, either dual cantilever or three-point bending.

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.

For example, a linear plot scale will result in a lower value of DMA Tg. This temperature is designated as TA. Should the results be retained, then these conditions shall be described in the test report. It is ideal because the glass transition is clearly displayed.

Dynamic Mechanical Proper- ties: This could indicate that the sample was taken from a defective portion of the laminate. Weigh the specimen after the test to the nearest milligram 0. A non-standard DMA Tg de? Using the approach of this test method the intersection point is drawn as shown in Fig.

If the two tangent lines are constructed from temperatures too close satm the transition, the intersection is depicted as shown in Fig. It is the responsibility of the user of this standard awtm establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

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. Depending on the analyzer, typical specimen size can range from 56 6 4 3 12 6 1 3 2. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every? In this example the transition is less clear than the thermogram of Fig.

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Work Item s – proposed revisions of this standard. NOTE 2—Guides EEand E contain data reporting recommendations for composite materials and composite materials mechanical testing. D Practice for Plastics: Any deviations from the standard orientation shall be reported and the test results noted as non-standard.

A span-to-thickness ratio greater than ten is recommended. Examples are shown in this appendix to provide graphical illustrations of how to select the two tangent lines.

The DMA Tg value d0728 frequently used to indicate the upper use temperature of composite materials, as well asstm for quality control of composite materials. Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM International Headquarters.

Record any visual anomalies observed. Using this approach the intersection point is drawn as shown in Fig.

ASTM D用DMA测试Tg_百度文库

Individual reprints single or multiple copies of this standard may be obtained by contacting ASTM at the above address or at phonefaxor service astm. During the glass transition, the storage modulus of the composite material is signi? This temperature is designated as TB.

Summary of Test Method 4. Historical Version s – view previous versions of standard. The values given in parentheses are non-standard mathematical conversions to common units that are provided for information only.