Matrix-assisted laser desorption/ionization mass spectrometry of synthetic polymers. 4. Coupling of size exclusion chromatography and MALDI-TOF using a spray-deposition interface

Esser, E.; Keil, C.; Braun, Dietrich; Montag, Peter; Pasch, Harald

doi:10.1016/s0032-3861(99)00646-1

Cited by 43 publications

(17 citation statements)

References 15 publications

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“…For polydisperse macromolecules, a continuous track of sample is deposited onto the matrix surface of the target; spectra are obtained from different positions on the track. Esser et al used this approach to study polystyrene 32500 and poly(methyl methacrylate) (PMMA) 10900 to obtain both M and copolymer composition of a diblock copolymer of n-butyl methacrylate and PMMA (27 ) .…”

Section: Ms Detectionmentioning

confidence: 99%

Multiple Detection in Size-Exclusion Chromatography of Macromolecules

Striegel¹

2005

Anal. Chem.

116

101

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Chemical and physical detectors characterize the distributions of macromolecular parameters that have a critical effect on the end product.S ynthesizing polymers is not as exact a science as we would like it to be. Natural syntheses and even well-controlled laboratory syntheses often yield macromolecules that vary in length, molar mass, branching, chemical composition, and other properties. Characterizing these properties and their distributions is important because of their critical effect on end-use structure-property relations and, hence, on the end product itself. The most commonly studied properties are the molar mass averages (M n , M w , M z , etc.) and the molar mass distribution (MMD). Various processing characteristics of macromolecules can be related to the individual averages, for example, flow properties and brittleness (related to M n ) and flex life and stiffness (related to M z ). Similarly, properties such as tensile strength and abrasion resistance tend to increase as MMD narrows, and properties such as elongation and yield strength tend to increase as MMD broadens.During the past four decades, size-exclusion chromatography (SEC) has been established as the premier method for characterizing M averages and the distribution of natural and

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Section: Ms Detectionmentioning

confidence: 99%

Multiple Detection in Size-Exclusion Chromatography of Macromolecules

Striegel¹

2005

Anal. Chem.

116

101

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“…Then, in the mass region of the dimer, most of the possibilities for the secondary products were selected (Figure 6b). The sodium adducts that can be formed during the ionization step might also be considered [12,13,14,15,16].…”

Section: Resultsmentioning

confidence: 99%

Epoxy Resins for Negative Tone Photoresists

et al. 2019

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One of the types of negative tone photoresists is composed of at least a catalyst, a solvent, and epoxy resin. This is the primary raw material for lithography technology. To ensure high-quality pattern transfer in the lithography process, it is crucial to control the properties of the photoresist. In this work, a set of resins based on Bisphenol-A were synthesized. The obtained resins have been characterized regarding the chain size and its derivative products. As a second step, an epoxidation reaction was performed and the epoxy groups were quantified. The profile of the resins, obtained by mass spectroscopy (ESI-µ-TOF-MS), showed that it is possible to tune the chain sizes of the polymers and their derivate by controlling the parameters of the polymerization reaction. Three profiles of resins were achieved in this study. Nuclear magnetic resonance (NMR) indicates an epoxidation in the range of 96%, when comparing the phenolic peak intensity before and after the reaction. Differential Scan Calorimetry (DSC) measurements confirmed the different oligomer profiles of resins, showing different glass transition temperatures.

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“…It has considerably high sensitivity, and also, MALDI is a suitable technique to characterize factors such as the polydispersion, data of the repeat units, impurities, and additives in synthetic polymers. It can also be applied to a considerable range of polar and non-polar polymers with an extensive range of molecular masses [35][36][37][38][39].…”

Section: Maldi-tof Analysismentioning

confidence: 99%