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Efficient identification of different types of carbons in organic solids by 2D solid-state NMR spectroscopy
The structure and dynamic behavior of mobile components play a significant role in determining properties of solid materials. Herein, we propose a novel real-time spectrum editing method to extract signals of mobile components in organic solids on the basis of the polarization inversion spin exchange at magic angle (PISEMA) pulse sequence and the difference in 13C T1 values of rigid and mobi...
http://www.polymer.cn//ss/sunpingchuan/publicationsshow_5164.html |
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Tracking the interdiffusion of polymers at a molecular level by 1H dipolar filter solid-state NMR under fast magic angle spinning
In this paper, we characterized the interdiffusion of deuterated polystyrene (PS-D) and hydrogenated poly(2,6-dimethyl-1,4-phenylene oxide) (PPO) by 1H dipolar filter solid-state NMR under fast magic angle spinning (MAS). It is observed that the interdiffusion process of PS-D/PPO is composed of two stages, the wetting stage and the diffusion stage. The characteristic time of the transition from th...
http://www.polymer.cn//ss/sunpingchuan/publicationsshow_5163.html |
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Evolution of Interphase in Styrene-Butadiene Block Copolymers as Revealed by 1H Solid-State NMR: Effect of Temperature and Molecular Architecture
1H spin-diffusion solid-state NMR, in combination with other techniques, was utilized to investigate the effect of molecular architecture and temperature on the interphase thickness and domain size in poly(styrene)-block-poly(butadiene) and poly(styrene)-block-poly(butadiene)-block-poly(styrene) copolymers (SB and SBS) over the temperature range from 25 to 80 C. These two block copolymers contain...
http://www.polymer.cn//ss/sunpingchuan/publicationsshow_5162.html |
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Solid-state NMR characterization of unsaturated polyester thermoset blends containing PEO-PPO-PEO block copolymers
First, the NMR method proposed in our previous work was improved to provide more accurate measurement of interphase thickness in multiphase polymers. Then the improved method, in combination with other techniques, was applied to elucidate the phase behavior, miscibility, heterogeneous dynamics and microdomain structure in thermoset blends of unsaturated polyester resin (UPR) and amphiphilic poly(e...
http://www.polymer.cn//ss/sunpingchuan/publicationsshow_5156.html |
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Characterization of polymer compatibility by H-1 dipolar filter solid-state NMR under fast magic angle spinning
Polymer compatibility was investigated by a new strategy reported in our recent communication combining preparation of an isotopically enriched polymer blend with analysis by dipolar filter 1H solid-state NMR under fast magic angle spinning (MAS). Technical details concerning the optimization of the experimental conditions of this method were first discussed. The intimate segment mixing and interc...
http://www.polymer.cn//ss/sunpingchuan/publicationsshow_5151.html |
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Probing chain interpenetration in polymer glasses by H-1 dipolar filter solid-state NMR under fast magic angle spinning
Chain interpenetration in polymer glasses was investigated by a new strategy combining preparation of an isotopically enriched polymer blend with analysis by 1H dipolar filtered solid-state NMR under fast magic angle spinning (MAS). The fast MAS at 25 kHz induces crucial changes in spin dynamics and selectively isolates the proton signal of hydrogenous PS chains in which protons are sufficiently c...
http://www.polymer.cn//ss/sunpingchuan/publicationsshow_5150.html |
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183. Hierarchical composites of polyaniline–graphene nanoribbons–carbon nanotubes as electrode materials in all-solid-state supercapacitors.
A three dimensional (3D) polyaniline (PANI)–graphene nanoribbon (GNR)–carbon nanotube (CNT) composite, PANI–GNR–CNT, has been prepared via in situ polymerization of an aniline monomer on the surface of a GNR–CNT hybrid. Here, the 3D GNR–CNT hybrid has been conveniently prepared by partially unzipping the pristine multi-walled CNTs, while the residual CNTs act as...
http://www.polymer.cn//ss/liutianxi/publicationsshow_4912.html |
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Preparation of PVC/Kaolin Nanocomposites through Solid State Shear Compounding Based on Pan-milling
Solid state shear compounding technology (S3C) based on pan-milling is an effective method to prepare polymer/layered mineral composites with nano intercalating structure. The PVC/Kaolin compounding powders were successfully prepared by pan-milling at ambient temperature, and then the PVC/Kaolin nanocomposites were processed by moulding The structure and properties of PVC/Kaolin compounding powder...
http://www.polymer.cn//ss/likanshe/publicationsshow_3511.html |
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Rotational Isomeric State Model of Poly (vinylidene chloride) based upon Ab Initio Electronic Structure Calculations
Rotational Isomeric State Model of Poly (vinylidene chloride) based upon Ab Initio Electronic Structure Calculations
http://www.polymer.cn//ss/luzhongyuan/publicationsshow_2795.html |
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Preparation of polypropylene/carbon nanotube composite powder with a solid-state mechanochemical pulverization process
A solid-state mechanochemical pulverization process, that is, pan milling, was used to prepare a polypropylene (PP)/carbon nanotube (CNT) composite powder. The composite powder was then melt-mixed with a twin-roll masticator to obtain a PP/CNT composite. The morphology of the PP/CNT powder and the PP/CNT composite was investigated. The crystallization and mechanical properties of the latter were a...
http://www.polymer.cn//ss/likanshe/publicationsshow_2403.html |
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