Chromatographic investigations of macromolecules in the critical range of liquid chromatography: 9. Separation of methacrylate-based polymer blends

Pasch, Harald; Rode, Karsten; Chaumien, N.

doi:10.1016/0032-3861(96)00250-9

Cited by 26 publications

(13 citation statements)

References 6 publications

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“…Improved results were gained with binary mixtures of toluene/MEK which had been used successfully to separate MMA blend systems 8,9) . Based on these experiments, a linear gradient was evaluated for the separation of PMMA and PEA or PBA calibration standards, respectively, starting with a low MEK/toluene ratio in the eluent.…”

Section: Resultsmentioning

confidence: 99%

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Phase separation in random copolymers from high conversion free radical copolymerization, 4. Chemical heterogeneity analysis of poly[(methyl methacrylate)‐ co ‐(ethyl acrylate)] and poly[(methylmethacrylate)‐ co ‐(butylacrylate)] by gradient HPLC and the effect on glass transition

Braun¹,

Krämer

Pasch

2000

Macromol. Chem. Phys.

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Section: Resultsmentioning

confidence: 99%

“…Experimental studies on high-conversion copolymers are quite rare although many investigations have been devoted to improving the methods for accurate determination of the CCD in the last ten years [8][9][10][11] .…”

Section: Introductionmentioning

confidence: 99%

Phase separation in random copolymers from high conversion free radical copolymerization, 4. Chemical heterogeneity analysis of poly[(methyl methacrylate)‐ co ‐(ethyl acrylate)] and poly[(methylmethacrylate)‐ co ‐(butylacrylate)] by gradient HPLC and the effect on glass transition

Braun¹,

Krämer

Pasch

2000

Macromol. Chem. Phys.

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“…It has been shown that it is possible to separate polymethacrylates on a polar stationary phase of silica gel with a mobile phase of methyl ethyl ketone (MEK) and cyclohexane (cHex) by LC-CC [13,14]. As a first step, the critical conditions for the different polymethacrylates (PDMA, PnBMA, PtBMA, and PMMA) were determined.…”

Section: Resultsmentioning

confidence: 99%

“…This component will elute either in the SEC or in the adsorption mode. For binary blends of polymethacrylates it was shown that, depending on the polarity of the components, polar or non-polar phases can be used [13,14]. Among other applications, LC-CC can also be used efficiently for the separation of homopolymers with regard to their functional groups as has been shown by Schoenmakers et al [15].…”

Section: Introductionmentioning

confidence: 91%

Development of Fast Gradient Separations for Different Polymethacrylates

Brüll¹,

Pasch

Bashir³

2006

E-Polymers

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Liquid chromatography of polymers is traditionally a slow technique with analysis times of typically 30 min per sample. To adapt liquid chromatographic techniques to combinatorial materials research the sample throughput must be significantly increased. Preferably, the analysis time per sample is to be reduced to a few minutes. Short analysis times can be achieved using high resolution stationary phases, high flow rates, and fast gradients. The present work demonstrates that gradient HPLC of polymethacrylates can be accomplished in less than 2 min. The fast separation of poly(methyl methacrylate), poly(i-propyl methacrylate), poly(n-butyl methacrylate), poly(tbutyl methacrylate), and poly(n-decyl methacrylate) is conducted on a short monolithic stationary phase using a flow rate of up to 7 mL/min. The optimization of the gradient is conducted by running a number of linear gradients and by simulating an optimum step gradient. Further modification of the simulated gradient results in the desired short analysis times.

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“…LC-CC has been successfully used for the determination of the functionality type distribution of telechelics and macromonomers [104][105][106][107][108][109], for the analysis of block copolymers [111][112][113][114], macrocyclic polymers [115], and polymer blends [116][117][118].…”

Section: Coupling Of Liquid Chromatography At the Critical Point Of Amentioning

confidence: 99%

Hyphenated Techniques in Liquid Chromatography of Polymers

Pasch

2000

New Developments in Polymer Analytics I

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Complex polymers are distributed in more than one direction of molecular heterogeneity. In addition to the molar mass distribution, they are frequently distributed with respect to chemical composition, functionality, and molecular architecture. For the characterization of the different types of molecular heterogeneity it is necessary to use a wide range of analytical techniques. Preferably, these techniques should be selective towards a specific type of heterogeneity. The combination of two selective analytical techniques is assumed to yield two-dimensional information on the molecular heterogeneity.The present review presents the principle ideas of combining different analytical techniques in two-dimensional analysis schemes. Most promising protocols for hyphenated techniques refer to the combination of two different chromatographic methods and the combination of chromatography and spectroscopy. This review will discuss the basic principles of two-dimensional chromatography and the hyphenation of liquid chromatography with selective detectors.

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Chromatographic investigations of macromolecules in the critical range of liquid chromatography: 9. Separation of methacrylate-based polymer blends

Cited by 26 publications

References 6 publications

Phase separation in random copolymers from high conversion free radical copolymerization, 4. Chemical heterogeneity analysis of poly[(methyl methacrylate)‐ co ‐(ethyl acrylate)] and poly[(methylmethacrylate)‐ co ‐(butylacrylate)] by gradient HPLC and the effect on glass transition

Phase separation in random copolymers from high conversion free radical copolymerization, 4. Chemical heterogeneity analysis of poly[(methyl methacrylate)‐ co ‐(ethyl acrylate)] and poly[(methylmethacrylate)‐ co ‐(butylacrylate)] by gradient HPLC and the effect on glass transition

Development of Fast Gradient Separations for Different Polymethacrylates

Hyphenated Techniques in Liquid Chromatography of Polymers

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