Amorphous Fraction Determination in Olefin Polymers
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Solution Overview
Problem
Current methods for measuring the amorphous fraction in olefin-based polymers, particularly those with high Xylene Soluble (XS) values and high molecular weight, face challenges due to difficult filtrations and require a more accurate and faster approach than ASTM D 5492-17.
Innovation Solution
A method involving dissolving olefin-based polymers in an organic solvent, injecting the solution onto a support material with a Co-crystallization Index (CI) of 0.70 to 1.20, cooling at a rate of 0.2°C/min, and increasing temperature to elute polymers, generating a chromatogram, and calculating the amorphous fraction using a specific equation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If ASTM D 5492-17 method is used to measure amorphous fraction, then measurement accuracy is maintained, but analysis time is excessive and filtration becomes difficult for high XS% materials
Solution Approach 1:
The invention changes the measurement parameters by using a standardized support material with Co-crystallization Index (CI) between 0.70 and 1.20, cooling rate between -0.05°C/min and -5°C/min, and specific elution temperature ranges. These parameter standardizations enable automated measurement while maintaining accuracy comparable to ASTM D 5492-17, reducing analysis time significantly.
Solution Approach 2:
The invention replaces the manual filtration step with an automated chromatographic separation system. Instead of physically filtering the polymer solution, the system uses temperature-controlled elution through a support material to separate and quantify the amorphous fraction, enabling automation and reducing manual intervention.
2Reliability
If traditional filtration method is used for high XS% and high molecular weight polymers, then measurement can be performed, but filtration difficulty increases significantly
Solution Approach 1:
The invention replaces the mechanical filtration process with a chromatographic separation method using a support material. The polymer solution is passed through the support material at controlled temperatures, allowing the amorphous fraction to be separated and quantified without physical filtration, thus eliminating filtration difficulties for high molecular weight and high XS% materials.
Solution Approach 2:
The invention changes the operational parameters by controlling the cooling rate (between -0.05°C/min and -5°C/min) and elution temperature profile. These controlled parameter changes enable reliable separation and measurement of the amorphous fraction without requiring difficult filtration steps, improving ease of operation while maintaining reliability.
3Productivity
If automated method is implemented for amorphous fraction determination, then analysis time is reduced and productivity increases, but measurement precision must be maintained
Solution Approach 1:
The invention establishes standardized parameters including support material with CI between 0.70 and 1.20, cooling rates between -0.05°C/min and -5°C/min, and specific elution temperature ranges. These standardized parameters enable automated operation while maintaining measurement precision comparable to manual ASTM D 5492-17 method, achieving both high productivity and accuracy.
Solution Approach 2:
The invention uses chromatographic detection with peak area integration to provide quantitative feedback on the amorphous fraction. The system measures the eluted amorphous fraction, integrates the peak area, and calculates the weight percent using the formula: wt% amorphous fraction = (PAamorp/PAtotal) × 100. This feedback mechanism ensures precise automated measurement.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method provides accurate and rapid determination of the amorphous fraction, achieving results close to ASTM D 5492-17 while reducing analysis time by up to 18% and allowing for automation.
Implementation Method 1
the support material has a Co-crystallization Index (CI) value from 0.70 to 1.20
Implementation Method 2
increasing the temperature of the support material to elute the polymers
Data Source
AI summary
A method to determine the weight percent of an “amorphous” fraction in an olefin-based polymer composition, comprising one or more olefin-based polymers; said method comprising the following steps: a) dissolving the olefin-based polymer composition in an organic solvent to form a polymer solution; b) injecting at least a portion of the polymer solution onto a support material, and wherein the support material has a Co-crystallization Index (CI) value from 0.70 to 1.20; c) cooling the support material at a rate greater than, or equal to, 0.2 C/min; d) increasing the temperature of the support material to elute the polymers of the olefin-based polymer composition; e) generating a chromatogram; f) determining the peak area of the first elution from its lower integration limit to its upper integration limit; g) calculating the “amorphous” fraction” based on the following Equation A below: wt % “amorphous” fraction=PAamorphous/PAtotal×100 (Eqn. A); wherein PAamorp=peak area of the first elution, and PAtotal #191=total peak area of the polymers of the olefin-based polymer composition.