Molar mass and microstructure analysis of PI- b -PMMA copolymers by SEC-NMR
Molar mass and microstructure analysis of PI- b -PMMA copolymers by SEC-NMR
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通过 SEC-NMR 分析 PI-b-PMMA 共聚物的摩尔质量和微观结构
DOI:
10.1002/macp.201100645
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发表时间:
2012
影响因子:
2.5
通讯作者:
H. Pasch
中科院分区:
文献类型:
--
作者:
M. Hehn;W. Hiller;T. Wagner;J. Thiel;H. Pasch
The online coupling of size‐exclusion chromatography and NMR is used to characterize block copolymers consisting of polyisoprene (PI) and poly (methyl methacrylate)(PMMA) regarding their distributions of molar mass (MMD) and chemical composition (CCD). Using the CCD, M_\rmn and M_\rmw are calculated on the basis of PI and PMMA homopolymer calibrations. The microstructure distribution of PMMA and the distribution of isomeric units of PI in dependence of molar mass is also demonstrated. Furthermore, a simulation analysis is presented for a bimodal eluting sample. It allows for full separation, quantification and molar mass determination of the coeluting co‐and homopolymer fractions. The quantification of the fractions is verified by liquid chromatography at critical conditions.
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DOI:
--
发表时间:
1978
期刊:
影响因子:
--
作者:
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通讯作者:
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DOI:
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发表时间:
1998
期刊:
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--
作者:
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1999
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C. Fernyhough;†. A. R. N. Young;R. Tack
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R. Tack
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作者:
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