DETERMINATION OF COMPOSITION DISTRIBUTION OF SEGMENTED POLYURETHANES BY THIN LAYER CHROMATOGRAPHYDETERMINATION OF COMPOSITION DISTRIBUTION OF SEGMENTED POLYURETHANES BY THIN LAYER CHROMATOGRAPHY |
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| Authors: | XU Mao LI Peiji WANG Ying LUO Xiaolie LIU Yan MA Dezhu |
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| Affiliation: | Institute of Chemistry; Academia Sinica; Beijing Department of Applied Chemistry China University of Science and Technology of China; Hefei; Anhui |
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| Abstract: | The compositional heterogeneity has been studied for a series of PCL/MDI/BDO segmentedpolyurethanes. Their average hard segment content measured by NMR method was ranging from 17% to 42%. Macromolecules of segmented polyurethanes can be separated according to theircomposition by TLC technique with a mixed solvent of toluene/acetone/ tetrahydrofuran as the devel-oper. A dual wavelength TLC spectrodensitometer was used for quantitative analysis of TLC results,and method for data treatment is proposed to obtain the composition distribution with no need of any reference samples as TLC eluticn standards.The polyurethane samples are found to be heterogeneous in composition,having bimodal distribution curves. |
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