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37. A Stimuli-Responsive Hydrogel with Reversible Three-State Transition Controlled by Redox Stimulation
A great extent of past work has focused on the development of stimuli-responsive hydrogels that can primarily achieve a two-state transition, such as sol-gel translation. In the current work, a reversible hydrogel with three-state transition is designed. The three transformations between original, oxidized, and reduced states are achieved via controlling the external stimuli conditions. Hy...
http://www.polymer.cnt//ss/ghgao/publicationsshow_11935.html |
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Reactivity of ethanol with ground state Ni+(2D) in the gas phase: A density functional study.
The bond activation of ethanol by the ground-state Ni+(2D) in the gas phase has been theoretically investigated using density functional theory. The approach of Ni+ towards ethanol could form five different Ni+–ethanol adducts, which correspond to Ni+ interaction through the O atom and C–H bonds, respectively. The O attached complexes are much more stable than that with Ni+ interaction through...
http://www.polymer.cnt//ss/luxiaoqing/publicationsshow_10217.html |
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Mechanistic insight into the gas-phase reactions of methylamine with ground state Co+(3F) and Ni+(2D).
The gas-phase reaction mechanisms of methylamine (MA) with the ground-state Co(+)((3)F) and Ni(+)((2)D) are theoretically investigated using density functional theory at both the B3LYP/6-311++G(d,p) and B3LYP/6-311++G(3df,2p) levels. The reactions for hydride abstraction and dehydrogenation are analyzed in terms of the topology of potential energy surfaces (PESs). Co(+) and Ni(+) perform similar...
http://www.polymer.cnt//ss/luxiaoqing/publicationsshow_10177.html |
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Photonic Crystals with a Reversibly Inducible and Erasable Defect State Using External Stimuli
The controlled introduction of artificial extrinsic defects is critical to achieve the functions of photonic crystals. Smart defects capable of responding to external stimuli lead to more advanced applications. Here we report a microgel colloidal crystal with a defect state which could be induced and erased reversibly by external stimuli. The crystal was assembled from PNIPAM microgel and P(NIPA...
http://www.polymer.cnt//ss/zhangyongjun/publicationsshow_10095.html |
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2H Solid-State NMR Analysis of the Dynamics and Organization of Water in Hydrated Chitosan
Understanding
water-biopolymer interactions, which strongly affect the function and
properties of biopolymer-based tissue engineering and drug delivery materials,
remains a challenge. Chitosan, which is an important biopolymer for the
construction of artificial tissue grafts and for drug delivery, has attracted
extensive attention in recent decades,
where neutralization
with an alkali solutio...
http://www.polymer.cnt//ss/sunpingchuan/publicationsshow_9175.html |
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Dynamic Evolution in PVPh/PEO Blend Studied by Solid-State NMR
13C CODEX variable-temperature solid-state NMR (SSNMR) technique was used to investigate the evolution of segmental dynamics in PVPh/PEO polymer blend within a wide range of temperature. It was found that the glass transition begins with the presence of remarkable slow motions of both the PVPh backbone segments and side groups, and ends when the CODEX signal intensity of segmental slow motion reac...
http://www.polymer.cnt//ss/sunpingchuan/publicationsshow_9033.html |
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Measuring the thermophysical properties of porous fibrous materials with a new unsteady-state method
In this article, the authors first introduced a theoretical model dealing with unsteady-state heat conduction in porous fabric to assess the effects due to local convection during the testing. A few important issues are analyzed including the criterion for local thermal equilibrium in the fibrous materials and the confidence time region (t min–t max) during measuring process. The influence due to...
http://www.polymer.cnt//ss/qulijun/publicationsshow_8893.html |
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Effect of Solid-state Shear milling on Structure and Properties of HDPE/UHMWPE blends
ABSTRACT: The structure and properties of HDPE/UHMWPE blends prepared through a pan-milling reactor in solid state at ambient temperature were compared with the blends made by melt mixing. The changes of structure and properties of the blends were investigated by FTIR, melt flow index, mechanical properties, dynamic rheological measurement, DSC, and WAXD. DSC measurement illustrated...
http://www.polymer.cnt//ss/zouhuawei/publicationsshow_6471.html |
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Effect of Solid-state Stress Induced Reaction on Morphology and Structure of Metallocene Polyethylene
Metallocene-catalyzed polyethylene (mPE)
powder was prepared through a mechanochemical reactor in solid state at ambient
temperature. The changes of morphology and structure of mPE were investigated
by SEM, FTIR, DSC, viscosimetry, GPC, WAXD, dynamic rheometer, and high
pressure capillary rheometer methods. FTIR measurement illustrated that the
branching degree of mPE increased after mech...
http://www.polymer.cnt//ss/zouhuawei/publicationsshow_6452.html |
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Tuning solid-state fluorescence of pyrene derivatives via a cocrystal strategy
1-Acetyl-3-(4-methoxyphenyl)-5-(1-pyrenyl)-pyrazoline (AMPP) was synthesized and crystallized to yield three types of crystals with different host–guest structures: AMPP crystal (I), AMPP–phenol (II) and AMPP–(2-naphthol) cocrystals (III). Twisted π-conjugated structures and different stacking modes of AMPP molecules were found in the three crystals. In crystal I, pyrene fluorophores adopt a f...
http://www.polymer.cnt//ss/wangml/publicationsshow_5387.html |
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