Determination and correction of peak broadening in size exclusion chromatography of controlled rheology polypropylene
Determination and correction of peak broadening in size exclusion chromatography of controlled rheology polypropylene
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DOI：
10.1002/app.1994.070540105
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发表时间：
1994-10
影响因子：
3
通讯作者：
K. Lederer;I. Beytollahi-Amtmann;J. Billiani
中科院分区：
文献类型：
--
作者：
K. Lederer;I. Beytollahi-Amtmann;J. Billiani
本文测定了七种窄摩尔质量分布（MMD）的商品聚苯乙烯（PS）标准品和6-9种聚丙烯（PP）级分（Mw/Mn = 1.34-2.10）在四种不同柱组中的尺寸排阻色谱峰展宽。PS和PP的高斯峰增宽参数σ2对峰洗脱体积的依赖性不同。对于Mw/Mn < 3的商业级受控流变PP（CR-PP）（Daplen PT 55），表明忽略峰增宽效应导致在低和较高摩尔质量下的MMD和多分散性参数Mw/Mn中的相当大的误差。奥地利国家研究计划研究了同一批次在加工和应用中的物理性能，并在IUPAC工作组IV.2.2的循环试验中进行了研究。商业聚合物的分子特征。John Wiley & Sons，Inc.
The peak broadening in size exclusion chromatography of seven commercial polystyrene (PS) standards with narrow molar mass distribution (MMD) and of 6–9 polypropylene (PP) fractions (Mw/Mn = 1.34–2.10) obtained by direct extraction was determined in four different column sets. The dependence of the Gaussian peak broadening parameter, σ2, on the peak elution volume was different for PS and PP. For a commercial grade of controlled rheology PP (CR-PP) (Daplen PT55) with Mw/Mn < 3 it was shown that disregard of the peak broadening effect leads to considerable errors in the MMD at low and higher molar mass and in the polydispersity parameter Mw/Mn. The same lot was studied in an Austrian National Research program for its physical propeties in processing and application and in a round-robin test of IUPAC working party IV.2.2. on molecular characterization of commercial polymers. © 1994 John Wiley & Sons, Inc.