aTREF and FTIR Analysis for Polymer Blend Identification
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Solution Overview
Problem
Conventional spectroscopic techniques are inadequate for providing both quantitative and qualitative analysis of multi-component polymer samples, such as multilayer polymer films, as they cannot accurately determine the type and amount of different polymer components without using time-consuming methods.
Innovation Solution
The method involves analytical temperature rising elution fractionation (aTREF) analysis, where a polymer sample is subjected to an aTREF solvent, eluted through a column, and the eluent is detected by infrared (IR) to produce an aTREF elution trace, which is then compared to a library to identify and quantify the polymer components using chemometric analysis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional spectroscopic techniques are used to analyze multi-component polymer samples, then the general category of polymer can be identified, but quantitative and qualitative information about specific polymer types and their amounts cannot be obtained
Solution Approach 1:
The patent combines aTREF (analytical temperature rising elution fractionation) with FTIR (Fourier transform infrared) detection to create a hybrid analytical system. The aTREF separation step resolves different polymer components based on their crystallization behavior at varying temperatures, while the FTIR detector provides quantitative chemical identification of each eluting fraction. This merging of separation and detection techniques enables both qualitative identification and quantitative measurement of polymer types in multi-component samples.
Solution Approach 2:
The patent introduces aTREF as an intermediary separation process between sample introduction and final detection. The aTREF system acts as a mediator that fractionates the complex polymer mixture into separable components based on their thermal and crystallization properties before they reach the FTIR detector. This intermediary step transforms an otherwise unresolvable complex mixture into discrete, detectable fractions that can be individually characterized and quantified.
2Measurement precision
If multiple time-consuming techniques are used to obtain quantitative and qualitative information about polymer components, then accurate analysis can be achieved, but the analysis time increases significantly
Solution Approach 1:
The patent implements continuous automated analysis where the aTREF system continuously separates polymer fractions while the FTIR detector continuously monitors and quantifies them in real-time. The system operates as an integrated continuous process rather than a series of discrete manual steps, eliminating idle time between separation and detection. The automated data processing and chemometric analysis further maintain continuity by immediately processing the elution traces without manual intervention.
Solution Approach 2:
The patent performs preliminary separation of polymer components through aTREF before detection, organizing the complex mixture into temperature-resolved fractions in advance. This preliminary action of fractionation based on crystallization temperature allows the subsequent FTIR detection to focus on already-separated components, significantly reducing the time required for analysis compared to attempting to directly analyze the unseparated mixture with multiple techniques.
3Loss of information
If conventional techniques are used to determine the number of layers and general polymer category, then basic information can be obtained, but specific polymer type identification and quantification remain elusive
Solution Approach 1:
The patent applies local quality analysis by examining the specific properties of each eluting fraction individually rather than analyzing the bulk sample as a whole. The aTREF system creates localized separations where each temperature range corresponds to specific polymer types with distinct crystallization behaviors. The FTIR detector then provides localized chemical fingerprinting of each fraction, enabling identification of specific polymer types (e.g., LDPE, LLDPE, HDPE) and their precise quantities within the multi-layer structure.
Solution Approach 2:
The patent utilizes parameter changes in the aTREF process, specifically varying the temperature during elution to exploit differences in crystallization behavior among polymer components. By systematically changing the temperature parameter and monitoring how different polymer fractions elute at different temperatures, the system generates distinctive elution traces that serve as fingerprints for identifying specific polymer types. This parameter-based separation complements the chemical information from FTIR to provide comprehensive polymer characterization.
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 effectively identifies and quantifies the polymer components in multi-component samples, enabling precise analysis and production of polymer resins with specific properties, and facilitates recycling by determining the composition of polymer samples.
Implementation Method 1
analytical temperature rising elution fractionation (aTREF) analysis to yield an aTREF elution trace, wherein the subjecting comprises: (i) contacting at least a portion of the polymer sample with an aTREF solvent to form a polymer sample solution; (ii) introducing at least a portion of the polymer sample solution into an aTREF column and allowing the polymer sample solution to elute along the aTREF column, wherein the two or more polymer components elute at different elution rates along the aTREF column
Implementation Method 2
subjecting at least a portion of the aTREF eluent to infrared (IR) detection to yield the aTREF elution trace
Data Source
AI summary
A method of analyzing a polymer resin comprising: providing a polymer resin sample having two or more polymer components; subjecting the sample to aTREF analysis to yield aTREF elution trace by contacting the sample with aTREF solvent to form sample solution; introducing sample solution into aTREF column and allowing elution of polymer components at different elution rates along the column; eluting from the aTREF column an aTREF eluent comprising the polymer components eluting at different rates; and subjecting the aTREF eluent to IR detection to yield the aTREF elution trace; identifying the components of the sample to yield identified components by comparing the elution trace with an identification library that comprises a plurality of known polymer aTREF elution traces correlated with known polymer components characterized by identifying parameters (density, SCB, crystallization temperature, MI, HLMI, MWD); and quantifying each of the identified components to yield quantified polymer components via chemometric analysis.