ASTM E1824-2018 Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis Tension Method.pdf
《ASTM E1824-2018 Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis Tension Method.pdf》由会员分享,可在线阅读,更多相关《ASTM E1824-2018 Standard Test Method for Assignment of a Glass Transition Temperature Using Thermomechanical Analysis Tension Method.pdf(5页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: E1824 13E1824 18Standard Test Method forAssignment of a Glass Transition Temperature UsingThermomechanical Analysis: Tension Method1This standard is issued under the fixed designation E1824; the number immediately following the designation indicates the year oforiginal adoption or, in t
2、he case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method coversdescribes a procedure for the assignment of a glass transition
3、 temperature (Tg) of materials onheating using thermomechanical measurements in tension.1.2 This test method may be used as a complement to Test Method E1545 and is applicable to amorphous or to partiallycrystalline materials in the form of films, fibers, wires, etc., that are sufficiently rigid to
4、inhibit extension during loading at ambienttemperature.1.3 The generally applicable temperature range for this test method is 100 C to 600C. 600 C. This temperature range maybe altered depending upon the instrumentation used.1.4 The values stated in SI units are to be regarded as standard. No other
5、units of measurement are included in this standard.1.5 There is no ISO method equivalent to this standard.1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibilityof the user of this standard to establish appropriate safety sa
6、fety, health, and healthenvironmental practices and determine theapplicability of regulatory limitations prior to use.1.6 This international standard was developed in accordance with internationally recognized principles on standardizationestablished in the Decision on Principles for the Development
7、 of International Standards, Guides and Recommendations issuedby the World Trade Organization Technical Barriers to Trade (TBT) Committee.2. Referenced Documents2.1 ASTM Standards:2E473 Terminology Relating to Thermal Analysis and RheologyE1142 Terminology Relating to Thermophysical PropertiesE1545
8、Test Method for Assignment of the Glass Transition Temperature by Thermomechanical AnalysisE2602 Test Methods for the Assignment of the Glass Transition Temperature by Modulated Temperature Differential ScanningCalorimetry3. Terminology3.1 Definitions:3.1.1 The following terms are applicable to this
9、 test method and can be found in Terminology E473 and Terminology E1142:thermomechanical analysis (TMA), thermodilatometry, glass transition, and glass transition temperature.4. Summary of Test Method4.1 This test method uses thermomechanical analysis equipment (thermomechanical analyzer, dilatomete
10、r, or similar device)with the test specimen in tension to determine the change in dimension of a thin specimen observed when the material is subjectedto a constant heating rate through the glass transition region. This change in dimension associated with the change from vitreoussolid to amorphous li
11、quid is observed as movement of a sensing probe in direct contact with the specimen and is recorded as a1 This test method is under the jurisdiction of ASTM Committee E37 on Thermal Measurements and is the direct responsibility of Subcommittee E37.10 on Fundamental,Statistical and Mechanical Propert
12、ies.Current edition approved Aug. 1, 2013Aug. 1, 2018. Published August 2013August 2018. Originally approved in 1996. Last previous edition approved in 20092013 asE1824 09E1824 13.1. DOI: 10.1520/E1824-13.10.1520/E1824-18.2 For referencedASTM standards, visit theASTM website, www.astm.org, or contac
13、tASTM Customer Service at serviceastm.org. For Annual Book of ASTM Standardsvolume information, refer to the standards Document Summary page on the ASTM website.This document is not an ASTM standard and is intended only to provide the user of an ASTM standard an indication of what changes have been
14、made to the previous version. Becauseit may not be technically possible to adequately depict all changes accurately, ASTM recommends that users consult prior editions as appropriate. In all cases only the current versionof the standard as published by ASTM is to be considered the official document.C
15、opyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States1function of temperature. The intersection of the extrapolation of the slope of the probe displacement curve before and after thetransition is used to determine a temperature that is assig
16、ned as the glass transition temperature.5. Significance and Use5.1 The glass transition is dependent on the thermal history, softening agents or additives of the material to be tested. Foramorphous and semicrystalline materials the assignment of a glass transition temperature may lead to important i
17、nformation aboutthermal history, processing conditions, stability, progress of chemical reactions, and mechanical and electrical behavior.5.2 Thermomechanical analysis provides a rapid means of detecting changes in hardness or linear dimensional changeassociated with the glass transition. Dimensiona
18、l changes measured as a specimen is heated over the glass transition region mayinclude the interaction of several effects: an increase in the coefficient of expansion, a decrease in the modulus, which under aconstant stress leads to increased extension, stress relief leading to irreversible dimensio
19、nal change (shrinkage in one dimension,expansion in another dimension), and physical aging effects which change the kinetics of the dimensional change.5.3 This test method is useful for research and development, quality control, and specification acceptance testing; particularlyof films and fibers.6
20、. Interferences6.1 This test method may be used for materials having a glass transition at or below ambient temperature providing care is takento avoid exposing the specimen to a tensile force prior to cooling the specimen below its glass transition. Applying a tensile loadon a specimen that is abov
21、e its glass transition will result in elongation of the specimen which may introduce orientation andresidual stresses that will alter the specimen thermal history and may yield erroneous results during the heating cycle.6.2 Specimens of thickness less than 0.2 mm may be difficult to handle.6.3 Speci
22、mens of thickness greater than 5 mm may develop temperature nonuniformities of sufficient extent as to yielderroneously high values for an assigned glass transition temperature using this test method.7. Apparatus7.1 The essential equipment required to provide the minimum instrument capability for th
23、is test method includes:7.1.1 A Thermomechanical Analyzer (TMA) or Thermodilatometer, consisting of:7.1.1.1 Rigid Specimen Holder, of inert, low expansivity material (20 mm-C), usually quartz, to center the specimen in thefurnace and to fix the specimen to mechanical ground.NOTE 1Use of rigid specim
24、en holders and tension probes constructed of lower thermal expansivity (20 m m-C) materials or corrections forhardware expansivity may be necessary if very small changes in specimen dimensions are encountered with this test method.7.1.1.2 Rigid Tension Probe, of inert, low expansivity material ( 5 m
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
最后一页预览完了!喜欢就下载吧,查找使用更方便
5000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ASTME18242018STANDARDTESTMETHODFORASSIGNMENTOFAGLASSTRANSITIONTEMPERATUREUSINGTHERMOMECHANICALANALYSISTENSIONMETHODPDF

链接地址:http://www.mydoc123.com/p-529575.html