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Copolymerization of poly (vinyl alcohol)-graft-poly (1, 4-dioxan-2-one) with designed molecular structure by a solid-state polymerization method
Poly(vinyl alcohol)-graft-poly(1,4-dioxan-2-one) (PVA-g-PPDO) with designed molecular structure was synthesized by a solid-state polymerization. The solid-state copolymerization was preceded by a graft copolymerization of PDO initiated with PVA as a multifunctional initiator, and Sn(Oct)(2) as a coininitiator/catalyst in a homogeneous molten state. The polymerization temperature was then decreased...
http://www.polymer.cnt//ss/wugang/publicationsshow_7825.html |
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195. One-step synthesis of graphene nanoribbon–MnO2 hybrids and their all-solid-state asymmetric supercapacitors.
Three-dimensional (3D) hierarchical hybrid nanomaterials (GNR–MnO2) of graphene nanoribbons (GNR) and MnO2 nanoparticles have been prepared via a one-step method. GNR, with unique features such as high aspect ratio and plane integrity, has been obtained by longitudinal unzipping of multi-walled carbon nanotubes (CNTs). By tuning the amount of oxidant used, different mass loadings of MnO2 nanopart...
http://www.polymer.cnt//ss/liutianxi/publicationsshow_6874.html |
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Critical Effect of Segmental Dynamics in Polybutadiene/Clay Nanocomposites Characterized by Solid State 1H NMR Spectroscopy
The segmental dynamics of rigid, intermediate, and mobile molecular components in carboxyl terminated polybutadiene (CTPB)/organo?clay (C18?clay) systems was characterized by fully refocused 1H NMR FID. In addition, 1H DQ NMR experiments allowed semiquantitative monitoring of changes in segmental dynamics near the interface. Both methods suggest a critical concent...
http://www.polymer.cnt//ss/wxlthefirst/publicationsshow_6621.html |
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Structure and Tensile Properties Change of LDPE/UHMWPE Blends via Solid State Shear Milling
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http://www.polymer.cnt//ss/zouhuawei/publicationsshow_6459.html |
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Reversible Cross-linking, Microdomain Structure and Heterogeneous Dynamics in Thermal Reversible Cross-linked Polyurethane as Revealed by Solid-State NMR
Polyurethane material is widely utilized in industry and daily life due to its versatile chemistry and relatively handling ease. Here, we focused on a novel thermal reversible cross-linked polyurethane with comprehensive remarkable mechanical properties as reported in our recent work (Adv. Mater. 2013, 25, 4912). The microphase-separated structure and heterogeneous segmental d...
http://www.polymer.cnt//ss/sunpingchuan/publicationsshow_6202.html |
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Molecular Dynamics and Crystallization Precursors in Polylactide and Poly(lactide)/CNT Biocomposites in the Insulating State
European Polymer Journal 2013, 49(12), 4008-4019
ABSTRACT:
The early stages of the cold crystallization process and the formation of a rigid amorphous phase as seen by the dielectric response of polylactide, PLA, and composites polylactide/carbon nanotubes, PLA/CNT, are studied here by broadband dielectric spectroscopy for CNT concentrations below percolation. The ...
http://www.polymer.cnt//ss/wudefeng/publicationsshow_5960.html |
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Tuning Solid-State Fluorescence of a Twisted π - Conjugated Molecule by Regulating the Arrangement of Anthracene Fluorophores
1-(5-(Anthracen-9-yl)-3-(4-methoxyphenyl)-4,5-dihydropyrazol-1-yl)ethanone was synthesized and crystallized to provide three types of crystals with different fluorescent colors and host–guest structures. Crystal structure analysis reveals that this compound possesses twisted π-conjugated structure and different degrees of distortion depending on guest molecules in the three crystal structures. T...
http://www.polymer.cnt//ss/wangml/publicationsshow_5386.html |
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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.cnt//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.cnt//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.cnt//ss/sunpingchuan/publicationsshow_5162.html |
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