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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Weigh the specimen after the test to the nearest milligram 0.
ASTM D7028 – 07(2015)
NOTE 2—Guides EEand E contain data reporting recommendations for composite materials and composite materials mechanical testing. Generally, the specimen should be centered between the clamp faces and be parallel to the base of the instrument. See Appendix X1 for additional guidelines to draw tangent lines.
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? Determination and Report of Procedures. Table 1 axtm the precision statistics generated from this study as de? 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. 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.
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. Opposite surfaces must be essentially parallel and intersecting surfaces perpendicular. A new or spare specimen shall be prepared from the same material package and tested to replace any specimens rejected per this paragraph. Any deviations from this heating rate shall be noted in the report and the result shall be reported as non-standard.
Should the results be retained, then these conditions shall be described in the test report. If the testing is part of a designed experiment, other sampling techniques may be used if described in the test plan. Current edition approved Dec. The temperature calibration points must span the DMA Tg result. D — 07? A span-to-thickness ratio greater than ten is recommended. Dynamic Mechanical Proper- ties: If a different heating rate is used it shall be described in the report and the result recorded as nonstandard.
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 maximum time between cure lamination and testing shall be 30 days, after which, prior to testing, specimens shall be oven-dried in accordance with 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.
Summary of Test Method 4.
Terminology D de? Specimen absolute size is not? Using this approach the intersection point is drawn as shown in Fig.
This temperature is designated as TA. During the glass transition, the storage modulus of the composite material is signi? Record any visual anomalies observed. For example, a linear plot scale will result in a lower value of DMA Tg.
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