ASTM D5028-1996(2003)e1 Standard Test Method for Curing Properties of Pultrusion Resins by Thermal Analysis《用热分析法测试挤拉树脂固化性的标准试验方法》.pdf
《ASTM D5028-1996(2003)e1 Standard Test Method for Curing Properties of Pultrusion Resins by Thermal Analysis《用热分析法测试挤拉树脂固化性的标准试验方法》.pdf》由会员分享,可在线阅读,更多相关《ASTM D5028-1996(2003)e1 Standard Test Method for Curing Properties of Pultrusion Resins by Thermal Analysis《用热分析法测试挤拉树脂固化性的标准试验方法》.pdf(3页珍藏版)》请在麦多课文档分享上搜索。
1、Designation: D 5028 96 (Reapproved 2003)e1Standard Test Method forCuring Properties of Pultrusion Resins by ThermalAnalysis1This standard is issued under the fixed designation D 5028; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision,
2、 the year of last revision. A number in parentheses indicates the year of last reapproval. Asuperscript epsilon (e) indicates an editorial change since the last revision or reapproval.e1NOTEReinserted Figure 1 in March 2007.1. Scope1.1 This test method covers determination of curing param-eters of p
3、ultrusions resins by differential scanning calorimetry.1.2 This test method is applicable to pultrusion resin solu-tions with adequate initiator(s).1.3 The normal operating temperature range is from 0 to200C.NOTE 1Resin systems which do not form an adequate baseline are notcovered by this test metho
4、d.1.4 Computer or electronic based instruments or data treat-ment equivalent to this practice may also be used.1.5 This standard does not purport to address all of thesafety concerns, if any, associated with its use. It is theresponsibility of the user of this standard to establish appro-priate safe
5、ty and health practices and determine the applica-bility of regulatory limitations prior to use. For specific hazardstatements, see Note 1.NOTE 2There is no similar or equivalent ISO standard.2. Referenced Documents2.1 ASTM Standards:2D 3418 Test Method for Transition Temperatures of Poly-mers By Di
6、fferential Scanning CalorimetryD 3918 Terminology Relating to Reinforced Plastic Pul-truded ProductsE 473 Terminology Relating to Thermal Analysis and Rhe-ologyE 967 Test Method for Temperature Calibration of Differ-ential Scanning Calorimeters and Differential ThermalAnalyzers3. Terminology3.1 Defi
7、nitions:3.1.1 onset temperaturean extrapolated point representingan intersection of the baseline and the front slope of theexothermic curing curve.3.1.2 peak temperaturean extrapolated point representingan intersection of both front and rear slopes of the exothermiccuring curve.4. Summary of Test Me
8、thod4.1 The test method consists of heating of the test materialat a controlled rate of temperature increase in a controlledatmosphere and continuously monitoring with a suitable sens-ing device the difference in heat input between a referencematerial and a test material due to changes of state in t
9、hematerial. A curing transition is marked by a release of energyby the specimen resulting in a corresponding exothermic curve.NOTE 3Toxic or corrosive effluents, or both, may be released whenheating the material, and could be harmful to the personnel or to theapparatus.5. Significance and Use5.1 Dif
10、ferential scanning calorimeters are used to determinechemical reaction thermal profiles of materials. One suchreaction is the curing of thermosetting resins.5.2 This test method is useful for both specification accep-tance and for research.6. Apparatus6.1 Differential Scanning Calorimeter, capable o
11、f heating atest specimen and a reference material at a controlled rate up toat least 20C/min and of automatically recording the differen-tial heat flow.1This test method is under the jurisdiction of ASTM Committee D20 on Plasticsand is the direct responsibility of Subcommittee D20.18 on Reinforced T
12、hermoset-ting Plastics.Current edition approved Nov. 1, 2003. Published December 2003. Originallyapproved in 1989. Last previous edition approved in 1996 as D 5028 - 96.2For referenced ASTM standards, visit the ASTM website, www.astm.org, orcontact ASTM Customer Service at serviceastm.org. For Annua
13、l Book of ASTMStandards volume information, refer to the standards Document Summary page onthe ASTM website.1Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.6.2 Specimen Holders, composed of clean aluminum or ofother high thermal cond
14、uctivity material.6.2.1 Specimen holders may be open, covered, or sealedtype.6.3 Nitrogen, or other inert purge gas supply.6.4 Flowmeter, for purge gas.6.5 Recording Charts, for temperature recording apparatuswith suitable graduation for measurements of energy differen-tial against temperature or ti
15、me.7. Technical Hazards7.1 An increase or decrease in heating rate from thosespecified may alter the test results. This practice assumes lineartemperature indication.7.2 Since milligram quantities of sample are used, it isessential to ensure that samples are homogeneous and repre-sentative.7.3 Sampl
16、e sizes larger than those specified in the testmethod may alter the test results.7.4 For comparison, the same heating rate, the same samplesize and the same type of pan and lid shall be used.7.5 For low viscosity resin systems, a sealed type of pan andlid shall be used to prevent excessive volatile
17、componentevaporation during the test.8. Test Specimen8.1 Thermoset resin system containing initiator(s) capableof curing in range from room temperature to 200C.8.2 Following the addition of initiator, the sample shall beheld for a minimum of12 h before commencing the test.9. Calibration9.1 Using the
18、 same heating rate to be used for samples,calibrate the apparatus with appropriate standard referencematerials. For temperature range of this standard, the followingmaterial may be used (NIST or equivalent quality):Standard_Melting Point, C_Indium 156.410. Procedure10.1 Weigh a sample of 5 to 10 mg.
19、10.1.1 Crimp a flat metal cover against the pan with thesample sandwiched between them to ensure good heat transfer.Take care to ensure that the cover contacts the resin surface.Place sample in the DSC cell.10.1.2 Intimate thermal contact between the sample andclean thermocouple or other temperature
20、 probe is essential forreproducible results.10.1.3 It is recommended to balance the energy flow into orout of the sample. Start the heating cycle when no movementof the recording pen is visible.10.2 Select appropriate x and y axis sensitivities to yield anarea of 30 to 60 cm3(5 to 10 in.2) under the
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