ISO INTERNATIONAL STANDARD 21561-2 Firstedition 2016-03-01 Styrene-butadiene rubber (SBR) - Determination of the microstructure of solution-polymerized SBR Part 2: FTIR with ATR method Caoutchouc styrene-butadiene (SBR) - Détermination de la microstructure du SBR polymérisé en solution- Partie 2: Meéthode FTIR avec ATR Reference number ISO 21561-2:2016(E) ISO International Organization for Standardization @ IS0 2016 ZHEJIANG INSTOFSTANDARDIZATION C15956617 ted without license from IHS IS0 21561-2:2016(E) COPYRIGHTPROTECTEDDOCUMENT IS02016,PublishedinSwitzerland All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Ch. de Blandonnet 8 . CP 401 CH-1214 Vernier, Geneva, Switzerland Tel. +41 22 749 01 11 Fax+412274909 47 [email protected] www.iso.org Intenationai br PrganizationforStandardization icensee-ZHEJIANG INST OF STANDARDIZoISQ s.6 - All rights reserved I by IHS unde etworking permitted without license from IHS IS0 21561-2:2016(E) Contents Page Foreword ..iv 1 Scope 2 Normative references .1 3 Principle. ..1 4 Apparatus ..2 5 Calibration .2 5.1 FTIR .2 5.2 ATR .2 6 Sampling. ..2 7 Procedure for measuring ATR spectrum .2 8 Determination of the microstructure of butadiene and the styrene content .3 8.1 Measurement of the absorbance for each microstructure component. .3 8.2 Calculationofmicrostructures 4 8.2.1 General 4 8.2.2 Base line correction of each absorbance peak .5 8.2.3 Ratio of absorbance. .5 8.2.4 Second orderterms .5 8.2.5 Styrene content and microstructures in mass % by regression formulae 5 8.2.6 Microstructures in mol % .6 9 Precision .6 10 Test report ..6 Annex A (informative) Precision results from an interlaboratory test programme Annex B (informative) Acquisition of regression formulae for microstructure ..10 Annex C (informative) Determination of microstructure by NMR spectrometry ..12 Bibliography .16 iii thout license from IHS