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离子液体的电导率性质反映了离子液体的导电性能,与溶剂中的电离度以及离子的溶剂化能力密切相关。为了研究本实验室合成的5种酯基取代的离子液体的电导率,用DDS307电导率仪测定1-乙酸甲酯基-3-甲基咪唑双三氟甲基磺酰亚胺([MIMCH2COOCH3]NTf2)、1-乙酸乙酯基-3-甲基咪唑双三氟甲基磺酰亚胺([MIMCH2COOCH2CH3]NTf2)、1-乙酸正丙酯基-3-甲基咪唑双三氟甲基磺酰亚胺([MIMCH2COOCH2CH2CH3]NTf2)、1-对甲基苯甲酸甲酯基-3-甲基咪唑双三氟甲基磺酰亚胺([MIMCH2C6H4COOCH3]NTf2)和1-对甲基苯甲酸乙酯基-3-甲基咪唑双三氟甲基磺酰亚胺([MIMCH2C6H4COOCH2CH3]NTf2)在二甲基亚砜、甲醇、乙腈和乙酸乙酯中的电导率数据。结果表明,其他条件不变时,在一定浓度范围内,离子液体的电导率随着其浓度的增大而增大;在一定温度范围内,随着温度的升高,离子液体电导率增大;4种溶剂相比电导率从小到大顺序依次为乙酸乙酯、二甲基亚砜、甲醇、乙腈,反映了带酯基的5种离子液体与乙酸乙酯的相互作用。 相似文献
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以2,4-二硝基咪唑为原料,经N-苄基保护合成出N-苄基-2,4-二硝基咪唑,并研究了其亲核取代反应,结果表明-N3、-F、-OCH3可以高收率的取代2位硝基,产物经核磁、质谱、元素分析进行了表征。 相似文献
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2-(2-氨基苯并[d]噻唑-6-基)苯并[d]噁唑-5-胺(化合物1)在氩气保护下,与N,N'-羰基二咪唑反应生成活性中间体,再与乙胺反应得到目标化合物1-(2-(2-氨基苯并[d]噻唑-6-基)苯并[d]噁唑-5-基)-3-乙基脲,其结构经1H NMR、13C NMR和HRMS确证.考察N,N'-羰基二咪唑的用量、反应时间和氩气保护因素对产物收率的影响,确定最佳的反应条件为:在氩气保护下,n(CDI):n(化合物1)=1.5:1,化合物1与CDI的反应时间为3 h.该条件下,目标化合物收率为51.6%. 相似文献
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从相关环境中取土样,稀释后涂布在无碳源固体琼脂培养基上,经28℃恒温培养,选择有微生物生长的平板分别涂布不同浓度的FeSt3改性LDPE,90d后选择微生物连续生长的改性LDPE,通过分析分子量的变化和羰基变化证明0.5%FeSt3改性的LDPE具备生物可降解性。从膜上分离到6株菌株,经生理生化特征观察和显微镜观察初,步鉴定出6株菌分别为:曲霉属曲、霉属、青霉属毛、霉属毛、霉属和根霉属。 相似文献
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丙烯酸树脂改性水性聚氨酯的结构与性能研究 总被引:3,自引:0,他引:3
采用丙烯酸树脂对水性聚氨酯进行改性,得到了共混改性(PU/PA)、共聚改性(PUA’)、接枝改性(PUA)3种丙烯酸改性水性聚氨酯聚合物。通过对改性聚氨酯乳液的激光粒度分析,乳胶膜的红外光谱、热分析、透明性、耐化学性及扫描电镜进行分析,结果表明:改性后的水性聚氨酯,各项性能均有不同程度的提高。在机械共混聚合物PU/PA体系中,聚氨酯分子链和丙烯酸树脂分子链间具有一定的相容性及共混性;在共聚反应聚合物PUA’、PUA体系中,聚氨酯分子链和丙烯酸树脂分子链形成核壳结构,且在PUA中,聚氨酯分子链和丙烯酸树脂分子链之间形成的化学键,可以有效的提高二者的相容性及共混程度。 相似文献
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以偏苯三酸酐、环氧氯丙烷及甲基丙烯酸缩水甘油酯为原料合成了超支化聚酯(HBP),再通过超支化聚合物的羧基与环氧树脂环氧基的反应得到环氧改性超支化聚合物;用GPC1、H-NMR、DSC、TGA表征了环氧改性超支化聚合物的结构和热性能;比较了不同环氧树脂用量改性前后树脂的光反应活性以及光固化涂层的耐擦洗性和硬度,测定了凝胶率-曝光时间曲线;以环氧改性超支化聚合物配制了光刻胶,在混合光源以及接触曝光的条件下,分辨率达到2~3μm,且图像十分清晰,断面整齐。环氧树脂用量为HBP羧基物质量的70%左右时,改性的超支化聚酯的光固化活性有明显提高,力学性能得到明显改进。 相似文献
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研究了以不同分子质量的丁羟(HTPB)、二异氰酸酯和固化剂为主要原料制备的PU弹性体的力学性能。结果表明,PU弹性体的力学性能随丁羟相对分子质量的增大而提高;R(n-NCO/n-OH)值达到8时,PU的力学性能最佳;用4种固化剂固化PU弹性体,结果表明复配的固化剂固化的PU弹性体力学性能最好;固化温度越高、时间越长,PU弹性体的力学性能越好。 相似文献
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以环氧苯乙烷(SO)为单体合成了不同分子量的预聚体聚环氧苯乙烷(PSO),再分别与不同比例浓硫酸进行磺化,得到一系列不同磺化度的阴离子-非离子两性高分子聚环氧苯乙烷磺酸聚醚(SPSO)。结构表征结果表明,PSO的分子量为4030到4950,随着引发剂量的减小,分子量呈递增趋势;SPSO除苯环部分磺化外,主链部分也发生磺化,且主链磺化趋势大于苯环,主链磺化度为200%,其总磺化度范围为287%到365%,随着浓硫酸量的增多总磺化度相应增大。 相似文献
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Rhoads DD Wolcott RD Sun Y Dowd SE 《International journal of molecular sciences》2012,13(3):2535-2550
Clinical diagnostics of chronic polymicrobial infections, such as those found in chronic wounds, represent a diagnostic challenge for both culture and molecular methods. In the current retrospective study, the results of aerobic bacterial cultures and culture-free bacterial identification using DNA analyses were compared. A total of 168 chronic wounds were studied. The majority of bacteria identified with culture testing were also identified with molecular testing, but the majority of bacteria identified with the molecular testing were not identified with culture testing. Seventeen (17) different bacterial taxa were identified with culture, and 338 different bacterial taxa were identified with molecular testing. This study demonstrates the increased sensitivity that molecular microbial identification can have over culture methodologies, and previous studies suggest that molecular bacterial identification can improve the clinical outcomes of patients with chronic wounds. 相似文献
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Nurhan Onar Aysun Cireli Akşit M. Faruk Ebeoglugil Isil Birlik Erdal Celik Ismail Ozdemir 《应用聚合物科学杂志》2009,114(4):2003-2010
In this study, the structural, electrical, and electromagnetic properties of cotton fabrics coated with polyaniline (PAni) and polypyrrole (PPy) were investigated and compared. For the aims, anilin and pyrrole were used as monomers, and in situ polymerization on cotton fabric by chemical oxidative polymerization was performed. After production, the structural properties of the fabrics were determined with Fourier transform infrared spectroscopy and X‐ray diffraction. In addition, ultraviolet (UV) permeability, tensile strength, colorfastness, and electrical and electromagnetic measurements of the fabric samples were carried out. The resistance values of the cotton fabrics coated with PAni and PPy were found to be 350 and 512 Ω, respectively. The average electromagnetic shielding efficiency and average absorption values of the cotton fabrics coated with PAni were determined to be 3.8 dB and 48%, respectively, and these values for the cotton fabrics coated with PPy were 6 dB and 50%, respectively. Consequently, a significant difference was not observed between the resistance values and electromagnetic parameters of the fabrics coated with PAni and PPy, although the intact textile characteristics of the fabric coated with PPy were protected and improved, whereas the characteristics of the fabric coated with PAni were inferior. Moreover, we first report that the fabrics coated with conductive polymers had excellent UV‐protection properties. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci, 2009 相似文献
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Polymer‐supported quaternary ammonium salts were prepared, and their applications as phase‐transfer catalysts in aqueous organic systems were investigated. The polymer‐bound phase‐transfer catalysts were prepared with polystyrene resins crosslinked with the bifunctional monomers divinylbenzene and 1,4‐butanediol dimethacrylate. The polymers were functionalized with chloromethyl groups and quaternized with trialkylamines having different alkyl chains. The obtained phase‐transfer catalysts were characterized with IR spectroscopy and elemental analysis. The thermal stability was also determined by the thermogravimetric method. The catalytic properties of the phase‐transfer catalysts were studied in halogen‐exchange reactions. The effects of the nature and extent of crosslinking of the polymer support, the alkyl groups of the trialkylamine, and the reaction conditions were investigated. © 2009 Wiley Periodicals, Inc. J Appl Polym Sci 2009 相似文献
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本文以苯甲酸为原料,经酰氯化生成苯甲酰氯,再与间苯二酚反应生成中间体2,4-二羟基二苯甲酮,产率79.4%。然后以2,4-二羟基二苯甲酮为封闭基,对位酯为重氮组分合成了黄、橙、红和蓝色4只新结构的活性染料,并用质谱对其结构进行了表征。用合成的染料对棉纤维染色,测定了染料的上染率和固色率,黄色染料染色性能较差。与未染色的棉纤维相比,染色后棉纤维的紫外线透过率大大降低。未染色纤维UPF值为1.3,经过黄、橙、红和蓝色染料染色的棉纤维的UPF值分别为6.1、16.1、16.0、18.5,除黄色外都达到了很好的抗紫外线效果。 相似文献