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<p class="MsoBodyText"><span lang="EN-GB">This document specifies procedures for the quantitative determination of the microstructure of the butadiene portion and the content of styrene in solution-polymerized SBR (S-SBR) by Fourier transform infrared spectrometry (FTIR) with attenuated total reflection (ATR) method. The styrene content is expressed in mass fraction relative to the S-SBR. The contents of three microstructure types, i.e. vinyl, trans and cis, are expressed in mol fraction relative to the butadiene portion in the S-SBR. This method is only applicable to raw rubbers.</span></p>
<p class="Note"><span lang="EN-GB">NOTE 1<span style="mso-tab-count: 1;"> </span>Precision as shown in Annex A is not always possible to obtain for S-SBRs containing polystyrene block or styrene content more than 45 %.</span></p>
<p class="Note"><span lang="EN-GB">NOTE 2<span style="mso-tab-count: 1;"> </span>Only “vinyl”, “trans” and “cis”, are used in this document. However, the expression of vinyl, trans and cis mean as follows in general:</span></p>
<p class="ListContinue1-" style="margin-left: 18.0pt; text-indent: -18.0pt; mso-list: l1 level1 lfo2;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><!--[endif]--><span lang="EN-GB">vinyl: vinyl unit, vinyl bond, 1,2-unit, 1,2-bond, 1,2-vinyl-unit or 1,2-vinyl-bond;</span></p>
<p class="ListContinue1-" style="margin-left: 18.0pt; text-indent: -18.0pt; mso-list: l1 level1 lfo2;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><!--[endif]--><span lang="EN-GB">trans: 1,4-trans unit, 1,4-trans bond, trans-1,4 unit or trans1,4 bond;</span></p>
<p class="ListContinue1-" style="margin-left: 18.0pt; text-indent: -18.0pt; mso-list: l1 level1 lfo2;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><!--[endif]--><span lang="EN-GB">cis: 1,4-cis unit, 1,4-cis bond, cis-1,4 unit or cis-1,4 bond.</span></p>
Reģistrācijas numurs (WIID)
85552
Darbības sfēra
<p class="MsoBodyText"><span lang="EN-GB">This document specifies procedures for the quantitative determination of the microstructure of the butadiene portion and the content of styrene in solution-polymerized SBR (S-SBR) by Fourier transform infrared spectrometry (FTIR) with attenuated total reflection (ATR) method. The styrene content is expressed in mass fraction relative to the S-SBR. The contents of three microstructure types, i.e. vinyl, trans and cis, are expressed in mol fraction relative to the butadiene portion in the S-SBR. This method is only applicable to raw rubbers.</span></p>
<p class="Note"><span lang="EN-GB">NOTE 1<span style="mso-tab-count: 1;"> </span>Precision as shown in Annex A is not always possible to obtain for S-SBRs containing polystyrene block or styrene content more than 45 %.</span></p>
<p class="Note"><span lang="EN-GB">NOTE 2<span style="mso-tab-count: 1;"> </span>Only “vinyl”, “trans” and “cis”, are used in this document. However, the expression of vinyl, trans and cis mean as follows in general:</span></p>
<p class="ListContinue1-" style="margin-left: 18.0pt; text-indent: -18.0pt; mso-list: l1 level1 lfo2;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><!--[endif]--><span lang="EN-GB">vinyl: vinyl unit, vinyl bond, 1,2-unit, 1,2-bond, 1,2-vinyl-unit or 1,2-vinyl-bond;</span></p>
<p class="ListContinue1-" style="margin-left: 18.0pt; text-indent: -18.0pt; mso-list: l1 level1 lfo2;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><!--[endif]--><span lang="EN-GB">trans: 1,4-trans unit, 1,4-trans bond, trans-1,4 unit or trans1,4 bond;</span></p>
<p class="ListContinue1-" style="margin-left: 18.0pt; text-indent: -18.0pt; mso-list: l1 level1 lfo2;"><!-- [if !supportLists]--><span lang="EN-GB" style="mso-fareast-font-family: Cambria; mso-bidi-font-family: Cambria;"><span style="mso-list: Ignore;">—<span style="font: 7.0pt 'Times New Roman';"> </span></span></span><!--[endif]--><span lang="EN-GB">cis: 1,4-cis unit, 1,4-cis bond, cis-1,4 unit or cis-1,4 bond.</span></p>
