BS ISO 17744-2004 Plastics - Determination of specific volume as a function of temperature and pressure (pVT diagram) - Piston apparatus method《塑料 作为温度和压力函数的比容的测定(pvT图) 活塞装置法》.pdf
《BS ISO 17744-2004 Plastics - Determination of specific volume as a function of temperature and pressure (pVT diagram) - Piston apparatus method《塑料 作为温度和压力函数的比容的测定(pvT图) 活塞装置法》.pdf》由会员分享,可在线阅读,更多相关《BS ISO 17744-2004 Plastics - Determination of specific volume as a function of temperature and pressure (pVT diagram) - Piston apparatus method《塑料 作为温度和压力函数的比容的测定(pvT图) 活塞装置法》.pdf(28页珍藏版)》请在麦多课文档分享上搜索。
1、BRITISH STANDARD BS ISO 17744:2004 Plastics Determination of specific volume as a function of temperature and pressure (p T diagram) Piston apparatus method ICS 83.080.01 BS ISO 17744:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee on 8 Dec
2、ember 2004 BSI 8 December 2004 ISBN 0 580 45006 6 National foreword This British Standard reproduces verbatim ISO 17744:2004 and implements it as the UK national standard. The UK participation in its preparation was entrusted to Technical Committee PRI/21, Testing of plastics, which has the responsi
3、bility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Sta
4、ndards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standa
5、rd does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European
6、 developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the ISO title page, pages ii to v, a blank page, pages 1 to 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the do
7、cument was last issued. Amendments issued since publication Amd. No. Date Comments Reference number ISO 17744:2004(E)NINRETOITALAN ADNATSDR OSI 14477 tide tsriFino -400251-11 Plastics Determination of specific volume as a function of temperature and pressure (pvT diagram) Piston apparatus method Pla
8、stiques Dtermination du volume spcifique en fonction de la temprature et de la pression (diagramme pvT) Mthode utilisant un appareil piston Referecne unbmer OSI 44771:002)E(4 OSI 4002INTERNATIONAL STANDARD ISO 17744 First edition 2004-11-15 scitsalP eteDtanimroifo n pscifice voula sa em ufncoitn fo
9、etrepma erutadn ( erusserpTvp idmarga) siP ton arappatem suthdo salPtiuqse D retmanitoiv ud nouls emcpifieuq f necnooitn de la pmetrrutae d tee la rpsesi( nodirgaaemm Tvp) tMedoh tulisitna nu rappaeil p istno BSISO17744:2004 ii BSISO17744:2004 iiiContents Page Foreword iv Introduction v 1 Scope 1 2
10、Normative references . 1 3 Terms and definitions. 2 4 Principle . 3 5 Apparatus. 4 6 Equipment calibration 7 7 Test sample . 8 8 Procedure. 8 9 Expression of results 10 10 Precision 10 11 Test report 10 Annex A (normative) Sources of error when specific volume is measured as a function of temperatur
11、e and pressure 12 Annex B (informative) Examples of pvT diagrams. 14 Bibliography . 18 BSISO17744:2004iv Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norm
12、ally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in t
13、he work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare
14、 International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some
15、 of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 17744 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 5, Physical- chemical properties. BSISO17744:2004 vIntroduction T
16、he characterization of changes in volume of plastics, as a function of temperature and pressure, is necessary for the purpose of simulation studies and for optimizing polymer processing. These thermophysical data may be used as they are or modelled in the form of suitable mathematical laws (see Refe
17、rences 7 to 12 in the Bibliography). In injection moulding, during the packing phase, most of the flow results from solidification. During solidification, if the plastic is semi-crystalline, the shrinkage is primarily due to crystallization. pvT data are used to model the volumetric shrinkage, which
18、 is translated into dimensional changes in the moulding. It should be pointed out that, while all the techniques described hereafter are equivalent in their ability to characterize the melt state pvT behaviour, the isobaric cooling measurement is the only one which allows characterization of both th
19、e supercooling behaviour and the pressure dependency of the transition. A list of references related to this International Standard is given in the Bibliography. BSISO17744:2004blankINTENRATIONAL TSANDADR IS:44771 O4002(E)1Plastics Determination of specific volume as a function of temperature and pr
20、essure (pvT diagram) Piston apparatus method 1 Scope This International Standard describes procedures for determining the specific volume of plastics as a function of temperature and pressure in both the molten and solid states. The standard specifies the use of a piston-equipped apparatus in which
21、the test sample, held in a measurement cell, is pressurized by means of the piston. Measurements under conditions of constant pressure or constant temperature can be made. In the constant-pressure mode, the maximum heating and cooling rates permissible are restricted to 5 C/min. NOTE Higher heating
22、and cooling rates can be used, but data will then have to be corrected for thermal gradients 13 . For the acquisition of data needed for processing design, it is recommended that the isobaric cooling method be used (see ISO 17282). The result of this measurement cannot be used directly for injection
23、-moulding simulation. By using these procedures, it is possible to obtain: pvT diagrams that represent the relationship which exists between pressure, specific volume and temperature for a given material; compressibility and volumetric thermal-expansion coefficients; information on first-order and g
24、lass transitions as a function of temperature and pressure. Although thermoplastic polymers are currently tested down to room temperature using these procedures, it is emphasized that, at temperatures lower than T g , the difficulty in achieving a true hydrostatic state is a source of uncertainty on
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