Method for determining the compositional distribution of a cryst

Details Method for determining the compositional distribution of a cryst Method for determining the compositional distribution of a cryst

1988-02-02

1991-04-16

Hill, Jr., Robert J.

Chemistry: analytical and immunological testing

Synthetic or natural resin

73 53, 73 611C, 210656, 210774, 436161, G01N 2500, G01N 3002, G01N 3102, G01N 3344

Patent

active

050082043

ABSTRACT:
A method for fractionating crystalline copolymers to determine solubility distribution as a function of temperature. Fractionation is conducted by passing a solvent through a column containing the crystallized copolymer at an increasing temperature from 6.degree. C. to about 120.degree. C. The polymer solution exiting the column is analyzed by infrared spectroscopy or NMR to determine the composition distribution of the copolymer.

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C. Bergstrom, E. Avela, "Investigation of the Composite Molecular Structure of LDPE by Using Temperature Rising Elution Fractionation", Journal of Applied Polymer Science, vol. 23, 163-171.
S. Nakano, Y. Goto, "Development of automatic Cross Fractionation: Combination of Crystallizability Fractionation and Molecular Weight Fractionation", Journal of Applied Polymer Science, vol. 26, pp. 4217-4231.

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