Tracking the interdiffusion of polymers at a molecular level by<sup>1</sup>H dipolar filter solid-state NMR under fast magic angle spinning

Gu, Qiang; Wang, Xiaoliang; Sun, Pingchuan; Zhou, Dongshan; Xue, Gi

doi:10.1039/c0sm00379d

Cited by 14 publications

(12 citation statements)

References 40 publications

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“…In a recent example, Gu et al 130 investigated the interdiffusion of poly(2,6-dimethyl-1,4-phenylene oxide) (PS/PPO) blends at the molecular level, exploiting the capability of solid state NMR spectroscopy to explore local chemical environments and provide information about dipole-dipole interactions over short distances.…”

Section: Molecular Structurementioning

confidence: 99%

“…NMR has long been part of the well-established techniques for the study of solid polymers, 129 along with differential scanning calorimetry (DSC), neutron reflectometry, confocal Raman micro-spectroscopy, or X-ray analysis. In a recent example, Gu et al 130 investigated the interdiffusion of poly(2,6-dimethyl-1,4-phenylene oxide) (PS/PPO) blends at the molecular level, exploiting the capability of solid state NMR spectroscopy to explore local chemical environments and provide information about dipole-dipole interactions over short distances.…”

Section: Molecular Structurementioning

confidence: 99%

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Microscale nuclear magnetic resonance: a tool for soft matter research

et al. 2012

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Nuclear magnetic resonance spectroscopy (NMR) and imaging (MRI) are important non-destructive investigative techniques for soft matter research. Continuous advancements have not only lead to more sensitive detection, and new applications, but have also enabled the shrinking of the detectable volume of sample, and a reduction in time needed to acquire a spectrum or image. At the same time, advances in microstructuring and on-chip laboratories have also continued unabated. In recent years these two broad areas have been productively joined into what we term micro nuclear magnetic resonance (mMR), an exciting development that includes miniaturized detectors and hyphenation with other laboratory techniques, for it opens up a range of new possibilities for the soft matter scientist. In this paper we review the available miniaturization technologies for NMR and MRI detection, and also suggest a way to compare the performance of the detectors. The paper also takes a close look at chiplaboratory augmented mMR, and applications within the broad soft matter area. The review aims to contribute to a better understanding of both the scientific potential and the actual limits of mMR tools in the various interdisciplinary soft matter research fields.

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Section: Molecular Structurementioning

confidence: 99%

Section: Molecular Structurementioning

confidence: 99%

Microscale nuclear magnetic resonance: a tool for soft matter research

et al. 2012

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“…On the other hand, the L eff within the crystalline structure could not be destroyed significantly despite the fact that a large number of P3HT chains were washed out by p-xylene during the PMMA coating. During the coating, some PMMA chains would have the chance to penetrate the P3HT films and produce the dilute effect, the so-called interdiffusion process, [32][33][34] thus leading to a semi-interpenetrating interfacial microstructure. In contrast, for the films made from high bp solvent cases, most of the P3HT chains in the crystalline and amorphous regions were washed out.…”

Section: Microstructural Properties Of the Bilayer Filmsmentioning

confidence: 99%

Polymer bilayer films with semi-interpenetrating semiconducting/insulating microstructure for field-effect transistor applications

Chen

Jang

et al. 2011

Soft Matter

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We report an unexpected improvement in the microstructural and electrical properties of regioregular poly(3-hexylthiophene) (P3HT) as an active layer in field-effect transistors (FETs) by introducing soft insulating chains from poly(methyl methacrylate) (PMMA) as a cover layer in a solvent modedependent manner. A joint experimental and theoretical spectroscopic and electrical analysis is provided to study the P3HT/PMMA bilayer films with semi-interpenetrating semiconducting/ insulating interlocked interdiffusion microstructures. Absorption and Raman studies reveal that disordered P3HT chains in films cast from a low-boiling point (bp) solvent favor reorganization into more ordered structures during PMMA covering, thus enhancing the electrical and switch behaviors of FETs. Although high-bp solvents initially create highly crystalline P3HT films, the films are significantly destroyed after the deposition of the PMMA layer, thus dramatically degrading FET characteristics. The semi-interpenetrating semiconducting/insulating microstructures in the designed bilayer films indicate the possibility of ameliorating field-effects in polymer FETs, especially in subthreshold swing and switch on-off behaviors.

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“…For high molecular weight polymers, characteristic diffusion distances that define the interfacial structure are in the range of tens to hundreds of nanometers. Several techniques which high‐spatial resolution (<100 nm) have been employed to investigate the topic, such as Forward Recoil Spectrometry, Nuclear Reaction Analysis or Fluorescence Resonance Energy Transfer, along with many others recently developed . With these techniques, diffusion coefficients below 10 −14 cm 2 /s have been typically measured.…”

Section: Introductionmentioning

confidence: 99%

Tracking high molecular weight polymer interdiffusion on a SERS‐based platform

Mana

Tomba

2016

J Raman Spectroscopy

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We describe the implementation of an experimental setup based on Surface Enhanced Raman Spectroscopy (SERS) to investigate polymer interdiffusion. Ultra‐thin bilayer films of deuterated polystyrene (dPS) and polystyrene (PS) are placed in contact onto SERS‐active gold substrates with inverted square‐base pyramidal geometry and subsequently annealed. Initially, the Raman spectrum shows only spectral features of the polymer adjacent to the substrate. Upon annealing, Raman bands of the polymer located far from the substrate start to emerge, an indication of chain diffusion into the substrate hotspot and mixing between polymer layers. The kinetics of the process is consistent with transport of polymer chains in nanometer scale, with diffusion coefficients in the range 10−13 – 10−15 cm2/s. The temperature response of the process is characterized by an activation energy of 48.93 ± 1.5 kcal/mol, in excellent agreement with earlier experiments. SERS experiments provide a powerful and reliable experimental platform to characterize polymer interdiffusion without the need of chemical labeling, with several prospective applications to the study of chain dynamics in advanced polymer‐based nanocomposite materials. Copyright © 2016 John Wiley & Sons, Ltd.

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Tracking the interdiffusion of polymers at a molecular level by¹H dipolar filter solid-state NMR under fast magic angle spinning

Cited by 14 publications

References 40 publications

Microscale nuclear magnetic resonance: a tool for soft matter research

Microscale nuclear magnetic resonance: a tool for soft matter research

Polymer bilayer films with semi-interpenetrating semiconducting/insulating microstructure for field-effect transistor applications

Tracking high molecular weight polymer interdiffusion on a SERS‐based platform

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Tracking the interdiffusion of polymers at a molecular level by1H dipolar filter solid-state NMR under fast magic angle spinning

Cited by 14 publications

References 40 publications

Microscale nuclear magnetic resonance: a tool for soft matter research

Microscale nuclear magnetic resonance: a tool for soft matter research

Polymer bilayer films with semi-interpenetrating semiconducting/insulating microstructure for field-effect transistor applications

Tracking high molecular weight polymer interdiffusion on a SERS‐based platform

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Product

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Tracking the interdiffusion of polymers at a molecular level by¹H dipolar filter solid-state NMR under fast magic angle spinning