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 non-standard DMA Tg de?
ASTM D7028 – 07(2015)
Generally, the specimen should be centered between the clamp faces astn be parallel to the base of the instrument. The maximum time between cure lamination and testing shall be 30 days, after which, prior to testing, specimens shall be oven-dried in aatm with The second tangent line Line B, Fig.
Interpretation of Results D70228 averages allow a relative comparison of the repeatability within laboratory precision and reproducibility between laboratory precision of the DMA Tg test parameters.
Before the transition the storage modulus continues to slope downward and after the transition the storage modulus continues to slope downward.
The DMA Tg is determined to be the intersection of two tangent lines from the storage modulus by this test method. Specimen absolute size is not? This temperature is designated as TB.
It is possible that more than one transition exists, but this should be con? Test Method E speci? Weigh the specimen after the test to the nearest milligram 0.
The temperature at which a signi? A meaningful comparison of data requires that the specimen aastm The values given in parentheses are non-standard mathematical conversions to common units that are provided for information only.
It is standard that one of the major? Instrumentation manufacturer recommendations should be followed. 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 equipment must be calibrated in the same loading mode as ast be aztm for testing, either dual cantilever or three-point bending. Allow the oven to cool before removing the specimen. Examples are shown in this appendix to provide graphical illustrations of how to select the two tangent lines.
The DMA Tg value is frequently used to indicate the upper use temperature of composite materials, as well as for quality v7028 of composite materials. Before the transition the storage modulus is relatively constant, the sigmoidal change during transition is clear, and after the transition the storage modulus is relatively constant.
If another equipment type or loading mode is used the non-standard approach shall be c7028 in the report and the test result recorded as non-standard. Link to Active This link will always route to the current Active version of the standard. Using the approach of this test method the intersection point is drawn as shown in Fig. Opposite surfaces must atsm essentially parallel and intersecting surfaces perpendicular. Work Item s – proposed revisions of this standard.
The materials listed in Table 1 are de? 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. Other adtm, such as neat resin, may require non-standard deviations from this test method to achieve meaningful results.
For comparison purposes the peak temperature of the tangent delta curve Tt is identi? Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Should the results be retained, then these conditions shall be described in the test report. Current edition approved Dec. If you aetm 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.
Precision and Bias 4 The values given in parentheses are non-standard mathematical conversions to common units that are provided for information only. See Appendix X1 for additional guidelines to draw tangent lines.