ISO-1628-5-1998.pdf
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1、A Reference number ISO 1628-5:1998(E) INTERNATIONAL STANDARD ISO 1628-5 Second edition 1998-03-15 Plastics Determination of the viscosity of polymers in dilute solution using capillary viscometers Part 5: Thermoplastic polyester (TP) homopolymers and copolymers Plastiques Dtermination de la viscosit
2、 des polymres en solution dilue laide de viscosimtres capillaires Partie 5: Homopolymres et copolymres des polyesters thermoplastiques (TP) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 0
3、4/22/2007 20:15:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 1628-5:1998(E) ISO 1998 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photoco
4、pying and microfilm, without permission in writing from the publisher. International Organization for Standardization Case postale 56 CH-1211 Genve 20 Switzerland Internetcentraliso.ch X.400c=ch; a=400net; p=iso; o=isocs; s=central Printed in Switzerland ii Foreword ISO (the International Organizati
5、on for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established ha
6、s the right to be represented on that committee. International organizations, governmental and non- governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. Dra
7、ft 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. International Standard ISO 1628-5 was prepared by Technical Committee ISO/TC
8、 61, Plastics, Subcommittee SC 9, Thermoplastic materials. This second edition cancels and replaces the first edition (ISO 1628-5:1986), which has been technically revised. ISO 1628 consists of the following parts, under the general title Plastics Determination of the viscosity of polymers in dilute
9、 solution using capillary viscometers: Part 1: General principles Part 2: Poly(vinyl chloride) resins Part 3: Polyethylenes and polypropylenes Part 4: Polycarbonate (PC) moulding and extrusion materials Part 5: Thermoplastic polyester (TP) homopolymers and copolymers Part 6: Methyl methacrylate poly
10、mers Annex A of this part of ISO 1628 is for information only. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 20:15:41 MDTNo reproduction or networking permitted without license
11、 from IHS -,-,- INTERNATIONAL STANDARD ISOISO 1628-5:1998(E) 1 Plastics Determination of the viscosity of polymers in dilute solution using capillary viscometers Part 5: Thermoplastic polyester (TP) homopolymers and copolymers 1Scope This part of ISO 1628 specifies a method for the determination of
12、the viscosity number (also referred to as “reduced viscosity”) of dilute solutions of thermoplastic polyesters (TPs) in certain specified solvents. The method is applicable to poly(ethylene terephthalate) (PET), poly(butylene terephthalate) (PBT), poly- (cyclohexylenedimethylene terephthalate) (PCT)
13、, and poly(ethylene naphthalate) (PEN), as well as to copolyesters and other polyesters, defined in ISO 7792-1, that are soluble in one of the specified solvents under the specified conditions. The viscosity number is determined by the general procedure specified in ISO 1628-1, observing the particu
14、lar conditions specified in this part of ISO 1628. The determination of the viscosity number of a thermoplastic polyester provides a measure of the relative molecular mass of the polymer. 2Normative references The following standards contain provisions which, through reference in this text, constitu
15、te provisions of this part of ISO 1628. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this part of ISO 1628 are encouraged to investigate the possibility of applying the most recent editions of the standards i
16、ndicated below. Members of IEC and ISO maintain registers of current valid International Standards. ISO 1628-1:1), Plastics - Determination of the viscosity of polymers in dilute solution using capillary viscometers - Part 1: General principles. ISO 3105:1994, Glass capillary kinematic viscometers -
17、 Specifications and operating instructions. ISO 3451-2:1984, Plastics - Determination of ash - Part 2: Polyalkylene terephthalates. ISO 7792-1:1997, Plastics - Thermoplastic polyester (TP) moulding and extrusion materials - Part 1: Designation system and basis for specifications. _ 1) To be publishe
18、d. (Revision of ISO 1628-1:1984) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/22/2007 20:15:41 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 1628-5:199
19、8(E) ISO 2 3Principle The times of flow of a solvent and a solution of resin in the solvent at a concentration of 0,005 g/ml are measured at 25 C by conventional methods. The viscosity number is calculated from these measurements and from the known concentration of the solution. Specific gravity dif
20、ference and kinetic energy corrections are small in this method and are not applied. 4Solvents WARNING - The solvents used are hazardous. Avoid contact with the skin and inhalation of the vapours. 4.1Phenol/1,2-dichlorobenzene Weigh out 1 part by mass of phenol (analytical grade) and dissolve in 1 p
21、art by mass of 1,2- dichlorobenzene (analytical grade). Work to an accuracy of 1 % or better in the weighings. 4.2Phenol/1,1,2,2-tetrachloroethane Weigh out 6 parts by mass of phenol (analytical grade) and dissolve in 4 parts by mass of 1,1,2,2- tetrachloroethane (analytical grade), or weigh out 1 p
22、art by mass of phenol and dissolve in 1 part by mass of 1,1,2,2-tetrachloroethane. Work to an accuracy of 1 % or better in the weighings. 4.3o-Chlorophenol, analytical grade. 4.4m-Cresol, meeting the following specifications: appearance: clear and colorless; m-cresol content: 99 % (m/m) min.; o-cres
23、ol content: 0,3 % (m/m) max.; water content: 0,1 % (m/m) max. NOTE - A solvent of the required purity can be obtained by distillation of chemically pure m-cresol, preferably in vacuo, pressure compensation being effected with nitrogen in order to avoid oxidation. The purity of the solvent may be che
24、cked by gas chromatography. 4.5Dichloroacetic acid, analytical grade. 4.6Phenol/2,4,6-trichlorophenol Weight out 6 parts by mass of phenol (analytical grade) and dissolve in 4 parts by mass of 2,4,6- trichlorophenol (analytical grade). NOTE - 2,4,6-trichlorophenol of the required purity can be obtai
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