Method for determining the compositional distribution of a crystalline copolymer
First Claim
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1. A method for determining the solubility distribution of a crystalline copolymer, comprising the steps of:
- dissolving the copolymer in a solvent at elevated temperature;
filling a column with the solvent containing the dissolved copolymer;
crystallizing the copolymer within the column by reducing the temperature of the column to below ambient temperature;
passing pure solvent through the column at an increasing column temperature to gradually dissolve the copolymer; and
continuously measuring the concentration of the copolymer in the solvent exiting the column.
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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° C. to about 120° 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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11 Claims
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1. A method for determining the solubility distribution of a crystalline copolymer, comprising the steps of:
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dissolving the copolymer in a solvent at elevated temperature; filling a column with the solvent containing the dissolved copolymer; crystallizing the copolymer within the column by reducing the temperature of the column to below ambient temperature; passing pure solvent through the column at an increasing column temperature to gradually dissolve the copolymer; and continuously measuring the concentration of the copolymer in the solvent exiting the column. - View Dependent Claims (2, 3, 4, 5)
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6. A method for determining the solubility distribution and composition distribution of a crystalline copolymer, comprising the steps of:
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dissolving the copolymer in a solvent at elevated temperature; filling a packed column with the solvent containing the dissolved copolymer; crystallizing the copolymer within the column by reducing the temperature of the column to below or about 6°
C,passing pure solvent through the column at an increasing column temperature to gradually dissolve the copolymer; continuously measuring the concentration of the copolymer in the solvent exiting the column; collecting the solvent exiting the column in fractions; and analyzing the solvent fractions for molecular weight and monomer composition. - View Dependent Claims (7, 8, 9)
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10. A method for determining the solubility distribution and composition distribution of a crystalline copolymer, comprising the steps of:
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dissolving the copolymer in a solvent at elevated temperatures; filling a column with the solvent containing the dissolved copolymer; crystallizing the copolymer within the column by reducing the temperature of the column to about 0°
C.,passing pure solvent through the column at 0°
C for at least an hour to remove uncrystallized polymer;passing pure solvent through the column at an increasing column temperature of from about 0°
C. to about 150°
C. to gradually dissolve the crystallized copolymer.continuously measuring the concentration of the copolymer in the solvent exiting the column; collecting the solvent exiting the column in fractions; and analyzing the solvent fractions for molecular weight and composition. - View Dependent Claims (11)
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Specification