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RISS 인기검색어
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- 저자 : Xiujuan Yan (검색결과 5 건)
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Xiujuan Huang,Meidong Lang,Yan Xiao 한국고분자학회 2012 Macromolecular Research Vol.20 No.6
A series of star-shaped poly(ε-caprolactone) (PCL)-based diblock and triblock copolymers containing 2-(dimethylamino)ethyl methacrylate (DMAEMA or DMA) and oligo(ethylene glycol)monomethyl ether methacrylate (OEGMA or OEG) were synthesized by one-pot atom transfer radical polymerization (ATRP) using a sixarm PCL-based macroinitiator. The precursor and the resultant copolymers were analyzed via proton nuclear magnetic resonance spectra (1H NMR) and size exclusion chromatography (SEC). The monomer reactivity ratios for DMAEMA (r1) and OEGMA (r2) were estimated to be near unity and r1×r2=1, which indicates the random distribution of the monomers in the final copolymers. Self-assembly behavior of these copolymers was investigated by fluorimetry,1H NMR, dynamic light scattering (DLS), transmission electronic microscopy (TEM), potentiometric titrations, and zeta potential measurements. The results suggested that the star copolymers were responsive to salinity depending on their composition and structure.
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Xiujuan Huang,Yan Xiao,Meidong Lang 한국고분자학회 2011 Macromolecular Research Vol.19 No.2
A series of amphiphilic six-armed copolymers, containing poly(ε-caprolactone) (PCL) and poly(2-(diethylamino)ethyl methacrylate) (PDEAEMA or PDEA) as the arm and cyclotriphosphazene as the core, were obtained by a combination of ring-opening polymerization (ROP) and atom transfer radical polymerization (ATRP). The star block S(PCL-b-PDEAEMA) copolymers were characterized by ^1H NMR spectroscopy and size exclusive chromatography (SEC). These copolymers could self-assembly into micelles in an aqueous solution at low pH with a low critical aggregation concentration (CAC) in the range of 2 to 10 mg/L, which depend on the composition of the copolymers. The original aggregates could further form larger micelles and/or vesicles by adjusting the external stimulus, which was examined by dynamic light scattering (DLS) and transmission electron microscopy (TEM). The lower critical solution temperature (LCST) of the star copolymers were determined to be 49.7 and 26.3 ℃ at pH 6.5and 7.4, respectively, demonstrating a pH-dependent thermo-response.
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Yan Wei,Han Xiaoxiang,Chen Keke,Zhang Xiaofang,Kuang Yingying,Tang Xiujuan 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.29 No.-
Ionic liquid catalysts which combine the characters of the Brønsted–Lewis solid acids and the ionic liquidare prepared. The obtained composite materials were well characterized by FT-IR, TGA, 1H NMR, 13CNMR and investigated their performance for acetalization. The acid strength was determined by theHammett method combined with UV–vis spectroscopy. Response surface methodology (RSM) wasapplied to optimize the synthesis of benzaldehyde glycol acetal and the effects of various reactionconditions. A Box–Behnken experimental Design (BBD) was employed to search for the optimal yield. The kinetic study for the acetalization was performed under the optimum operating conditions
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Chen, Guanliang,Lin, Xiujuan,Li, Jianan,Fisher, John G.,Zhang, Yan,Huang, Shifeng,Cheng, Xin Elsevier 2018 CERAMICS INTERNATIONAL Vol.44 No.13
<P><B>Abstract</B></P> <P>Flexible dielectric composite films are highly desirable materials with potential application in capacitors due to their high energy density and discharged efficiency. However, agglomeration induced by the large surface energy of nanoparticles and their large dielectric losses are unfavorable to the improvement of energy density. Submicron lead zirconate titanate (PZT) particles have shown great potential as filler in achieving a high energy storage capacity because of their excellent dielectric properties and good dispersion. In this work, calcined PZT particles were used to prepare PZT/polyvinylidene fluoride (PVDF) composite films. The results showed that composite films of high quality could be obtained even with high contents of submicron PZT particles. The introduction of PZT particles significantly improved the dielectric performance of composite films compared with that of the pristine PVDF film. The discharged energy density of composite films with 10 vol% PZT particles achieved 6.41 J/cm<SUP>3</SUP> at 250 kV/mm. A high efficiency of 87.25% was obtained at 50 kV/mm. These findings confirm the feasibility of PZT particles as inorganic filler in composite films for energy storage applications.</P>
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Xin Chen,Qingqing Luo,Xiujuan Yan,Wenting Li,Shengliang Chen 대한소화기 기능성질환∙운동학회 2019 Journal of Neurogastroenterology and Motility (JNM Vol.25 No.3
Background/AimsAbdominal pain can be evoked or exacerbated after gastrointestinal cold stimulation in some patients with diarrhea-predominantirritable bowel syndrome (IBS-D), indicating a low temperature-induced sensitization of visceral perception. We investigated the roleof vagal transient receptor potential ankyrin 1 (TRPA1, a cold-sensing ion channel) in cold-aggravated visceral mechanonociception ina stress-induced IBS animal model. MethodsTRPA1 expression was examined in antral biopsies of healthy controls and IBS-D patients. Abdominal symptoms were assessed beforeand after warm or cold water intake. The visceromotor response (VMR) to colorectal distention (CRD) following intra-antral infusionof cold saline was measured in animals undergoing sham or chronic water avoidance stress. TRPA1 expression, extracellular signalregulatedprotein kinase 1/2 (ERK1/2) phosphorylation, and neuronal calcium influx in vagal afferents were assessed. ResultsCompared to healthy controls, IBS-D patients displayed elevated antral TRPA1 expression, which was associated with symptom scoresafter cold (4°C) water intake. Intra-antral infusion of cold saline increased VMR to CRD in naive rats, an effect dependent on vagalafferents. In stressed rats, this effect was greatly enhanced. Functional blockade and gene deletion of TRPA1 abolished the cold effecton visceral nociception. TRPA1 expression in vagal (but not spinal) afferents increased after stress. Moreover, the cold-induced, TRPA1-dependent ERK1/2 activation and calcium influx in nodose neurons were more robust in stressed rats. ConclusionsStress-exaggerated visceral mechanonociception after antral cold exposure may involve up-regulation of TRPA1 expression andfunction on vagal afferents. Our findings reveal a novel mechanism for abnormal gastrointestinal cold sensing in IBS.
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