Conclusions
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1.
Polyethylenimine (PEI) was fractionated by three different methods: fractional precipitation, fractional extraction of the sulfate, and successive elution of the polymer adsorbed on Sephadex resin.
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2.
High-molecular PEI is characterized by a bimodal molecular weight distribution: ~2/3 is comprised of fractions with low-molecular weights, and 1/3 of fractions with mol. wt. 40–120 thousand. Low-molecular PEI, produced by acid polymerization of ethylenimine, is characterized by a narrow molecular weight distribution.
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3.
The Kuhn-Mark-Hauwink functions were obtained for solutions of PEI in abs. alcohol and a 0.1 N solution of NaCl in the interval of molecular weights from 1000 to 120,000.
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Literature cited
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Deceased.
Translated from Izvestiya Akademii Nauk SSSR, Seriya Khimicheskaya, No. 8, pp. 1636–1642, August, 1971.
The authors would like to thank S. A. Pavlov for determining the molecular weights by an ebullioscopic method.
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Kosheleva, I.M., Gembitskii, P.A., Chmarin, A.I. et al. Some properties and the structure of high-molecular polyethylenimine. Russ Chem Bull 20, 1536–1541 (1971). https://doi.org/10.1007/BF00859999
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DOI: https://doi.org/10.1007/BF00859999