Studies on the use of filter-based IR detector for short-chain branching characterization of polyolefin copolymers with high temperature size exclusion chromatography

Frijns-Bruls, Tiny; Ortín, A.; Weusten, Jos; Geladé, E.

doi:10.1016/j.polymer.2019.121600

Cited by 8 publications

(21 citation statements)

References 24 publications

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“…The IR-5 provides a more robust concentration detector with less sensitivity to pressure and temperature changes compared to a DRI detector, and it can also be used for determination of comonomer content across the MWD. An evaluation of two different IR-5 detectors on two different HT-GPC instruments was recently reported . It was found that TCB is not completely transparent in the IR-5 detector wavelength range, so the IR absorbance from the sample can be overwhelmed by very strong background absorbance from the solvent.…”

Section: Size-based Separations Of Synthetic Polymersmentioning

confidence: 99%

“…For nonpropylene copolymers having less than 70 methyl groups per 1000 carbon atoms, a single linear composition calibration was obtained. For propylene-based copolymers, a nonlinear calibration was needed . In another example of composition-based detection, isotopic labeling via the deuterium exchange process was developed successfully for polyethylene, isotactic and syndiotactic polypropylene and was monitored by HT-GPC coupled to IR-5 .…”

Section: Size-based Separations Of Synthetic Polymersmentioning

confidence: 99%

“…An evaluation of two different IR-5 detectors on two different HT-GPC instruments was recently reported. 39 It was found that TCB is not completely transparent in the IR-5 detector wavelength range, so the IR absorbance from the sample can be overwhelmed by very strong background absorbance from the solvent. A background zeroing procedure was used to correct for solvent absorbance.…”

mentioning

confidence: 99%

“…For propylene-based copolymers, a nonlinear calibration was needed. 39 In another example of composition-based detection, isotopic labeling via the deuterium exchange process was developed successfully for polyethylene, isotactic and syndiotactic polypropylene and was monitored by HT-GPC coupled to IR-5. 32 The effect of deuterium on molecular structure of polyethylene and polypropylene, was quantified through the change in C−H absorbance across the MWD, as the change from C−H to C−D caused a reduction in IR-5 absorbance.…”

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confidence: 99%

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Recent Advances in Separation-Based Techniques for Synthetic Polymer Characterization

et al. 2020

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Section: Size-based Separations Of Synthetic Polymersmentioning

confidence: 99%

Section: Size-based Separations Of Synthetic Polymersmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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Recent Advances in Separation-Based Techniques for Synthetic Polymer Characterization

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“…An in‐depth research on the quantitative aspects was recently published by Frijns‐Bruls et al. [121]. Recently, Beskers et al.…”

Section: Detectors In Polymer Lc and Their Strengths And Weaknessesmentioning

confidence: 99%

Detection challenges in quantitative polymer analysis by liquid chromatography

Knol

Pirok

Peters

2020

J of Separation Science

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Accurate quantification of polymer distributions is one of the main challenges in polymer analysis by liquid chromatography. The response of contemporary detectors is typically influenced by compositional features such as molecular weight, chain composition, end groups, and branching. This renders the accurate quantification of complex polymers of which there are no standards available, extremely challenging. Moreover, any (programmed) change in mobile‐phase composition may further limit the applicability of detection techniques. Current methods often rely on refractive index detection, which is not accurate when dealing with complex samples as the refractive‐index increment is often unknown. We review current and emerging detection methods in liquid chromatography with the aim of identifying detectors, which can be applied to the quantitative analysis of complex polymers.

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A retrospective look at developments in size exclusion chromatography from the early Hamielec research era to the present day

McManus

2023

Can J Chem Eng

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At the start of Archie Hamielec's research career, size exclusion chromatography (SEC) (including gel permeation chromatography [GPC]) was in its infancy as an analytical and preparative laboratory technique in polymer science and engineering. As described below, Archie Hamielec saw its potential early in his academic career and was among the group of pioneers who took it from a developing technique to what it is now. His group's work was instrumental in improving the understanding of the mechanism of separation in SEC and setting up best procedures for sample handling. In addition, much work was done to assess detectors to improve data collection and to obtain consistent/reliable measurements. Importantly, he established it as a key method for obtaining molecular size information to support research in polymer reaction engineering. Nowadays we take it for granted that we can use SEC to obtain molecular weight data rapidly and reliably with user‐friendly computer‐aided analyses. This ease of routine practicality stems from the base that the early researchers built. Although now it is a well‐developed (almost ‘black box’) method there are still areas of novel interest into analysis of complex polymer samples. This has led to modern developments forging ahead in expanding the applicability of SEC as an analytical technique with the exploitation of multi‐detector systems and novel detectors.

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Studies on the use of filter-based IR detector for short-chain branching characterization of polyolefin copolymers with high temperature size exclusion chromatography

Cited by 8 publications

References 24 publications

Recent Advances in Separation-Based Techniques for Synthetic Polymer Characterization

Recent Advances in Separation-Based Techniques for Synthetic Polymer Characterization

Detection challenges in quantitative polymer analysis by liquid chromatography

A retrospective look at developments in size exclusion chromatography from the early Hamielec research era to the present day

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