Table of Content

22 November 2018, Volume 48 Issue 11 Previous Issue    Next Issue

Basic research

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Synthesis and properties of nonionic fluorosilicone surfactants YE Zhi-gang, ZHAN Chang-chao, CAO Xiao-hua, HU Qing-hua, TAN Jing-lin 2018, 48 (11):  605-610.  doi: 10.13218/j.cnki.csdc.2018.11.001 Abstract ( 338 )   PDF (4703KB) ( 267 )   Hydrosilylation of poly(methylhydrosiloxane) (PMHS) with N-methyl-N-allyl-2- perfluoro-2-methyl-3-oxocaproamide (NF2) and allyl polyethylene glycol (F6) was conducted in the presence of the Karstedt catalyst in order to prepare a series of nonionic fluorosilicone surfactants (PF2F6).The structure of the products were characterized by FT-IR,1H NMR and19F NMR.The properties of the products including solubility,cloud point,surface tension and wettability were measured.The results show that the solubility of PF2F6 in polar solvents was excellent and the solubility in water increases with the increase of the content of F6.When the molar ratio of Si-H∶NF2∶F6 is 2∶0.7∶1.3,the critical micelle concentration (cmc) and the surface tension at cmc (γcmc) are minimum,which are 0.13 g/L and 22.8 mN/m,respectively.The cloud point of PF2F6 increases and the contact angle on PMMA surface decreases with the increase of the content of F6 in the reaction system. References | Related Articles | Metrics

Lecture of science and technology

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Self-assembly of surfactants regulated by weak interaction (Ⅰ)The classification of weak interactions REN Shu-jing, ZHENG Li-qiang, SUN Ji-chao 2018, 48 (11):  611-616.  doi: 10.13218/j.cnki.csdc.2018.11.002 Abstract ( 329 )   PDF (7084KB) ( 86 )   The self-assembly of surfactants relies on the weak interactions between molecules,including hydrophobic interaction,hydrogen bond interaction,host-guest interaction,electrostatic interaction,π-π stacking interaction,metal coordination interaction and charge transfer interaction.The self-assembly of amphiphilic molecules can be controlled by regulating the interaction between molecules.This paper introduces the influence of weak interactions on the structure and function of ordered molecular aggregates formed by self-assembly of amphiphilic molecules. References | Related Articles | Metrics

Development and application

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Research on the seepage characteristics and dynamic damage rules of thealkali/surfactant/polymer flooding system (ASP) ZHAO Xi-sen, YANG Hong, YU Feng, WANG Jie, WANG Hong, JIN Zhi 2018, 48 (11):  617-621.  doi: 10.13218/j.cnki.csdc.2018.11.003 Abstract ( 238 )   PDF (5044KB) ( 247 )   To solve the problems that (1) the ASP seepage characteristics in real petroleum reservoir can’t be properly simulated when using single core only;and (2) the loss can’t be evaluated accurately by the evaluation with just static loss,in this work,a seepage experiment for the ASP system was carried out to study its seepage characteristics and loss rules with different core scales on the basis of measuring method optimization.The experimental results show that,with the increase of core scale,the alkali and polymer curves are gradually pushed to the right and their loss ratios influenced by adsorption and retention are gradually increased.In contrast,the increase of core scale nearly has no influence on surfactant.The sequence of the relative concentration at the same position of the upstream region of seepage front is:alkali>surfactant>polymer.In addition,the contribution of adsorption,retention and shear on polymer viscosity loss are different with different stages of injection. References | Related Articles | Metrics

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Study of physical and chemical properties of alkyl polyxylosidase BAI Liang, YANG Xiu-quan, WU Zhi-yu 2018, 48 (11):  622-626.  doi: 10.13218/j.cnki.csdc.2018.11.004 Abstract ( 280 )   PDF (3589KB) ( 265 )   The properties of alkyl polyxylosidase (AX) with different carbon chain length and average polymerization degree (DP) were evaluated.The results show that AX can reduce the surface tension of water to below 26 mN/m.The critical micelle concentration (cmc) and surface excess concentration (Гmax) of AX are decreased with the increasing length of carbon chain,and the Гmax is higher than that of alkyl polyglycoside (APG) with the same carbon chain.The foaming ability,foam stability,hard water resistance and wetting power of AX are all superior to that of APG with the same carbon chain.With the increase of DP of AX,the cmc and the surface tension at cmc (γcmc) are both increased,and the Гmax is decreased.The DP of AX has no significant effect on the foaming ability.However,the hard water resistance,wetting power and emulsifying ability of AX are enhanced with the decrease of DP. References | Related Articles | Metrics

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Synthesis of benzoxanthene catalyzed by functionalized ionic liquids [C3SO3Hnhm]HSO4 TANG Xiao-fang, LIU Xian-ming, ZHOU Si-yan, LI Shuang 2018, 48 (11):  627-631.  doi: 10.13218/j.cnki.csdc.2018.11.005 Abstract ( 230 )   PDF (4123KB) ( 242 )   A solvent-free synthesis of benzoxanthene was operated,in which functionalized acidic ionic liquids,4-(3-propanesulfonic acid) morphinehydrogen sulfate [C3SO3Hnhm]HSO4 were used as catalysts,andβ-naphthol and aromatic aldehyde were used as raw materials.The reaction conditions were optimized by the single factor experiment and orthogonal experiment,and the reusability of the ionic liquid catalyst was also studied.The results show that when the dosage of benzaldehyde is 0.005 mol,the molar ratio ofβ-naphthol to benzaldehyde is 2∶1,and the catalyst is in an amount corresponding to 6% of benzaldehyde,the yield can reach more than 91% after reaction for 10 min at 100 ℃.The catalytic activity of [C3SO3Hnhm]HSO4 was not significantly reduced for being reused 5 times.This work has provided a new method for green synthesis of benzoxanthene compounds. References | Related Articles | Metrics

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Synthesis and properties of polyvinyl acetate and its europium complexes LI Shan-ji, XIE Peng-bo, YUAN Ning-ning, OUYANG Ying 2018, 48 (11):  632-636.  doi: 10.13218/j.cnki.csdc.2018.11.006 Abstract ( 312 )   PDF (4487KB) ( 256 )   Polyvinyl acetate (PVAc) was synthesized with benzoyl peroxide (BPO) as initiator and methanol as solvent.The effects of the amounts of initiator and methanol and the reaction time on conversion and solid content were studied.The adhesive performance of polymers was also measured.In addition,the europium complex of PVAc (PVAc-Eu) was synthesized using PVAc as polymer ligand,and the structures of ligand and complex were characterized by IR spectroscopy.The luminescent and thermal properties of complex were also studied.The results show that,the optimized conditions for polymerization are as follows:methanol is in an amount corresponding to 11.9% of the volume of monomer,the dosage of initiator is 0.19 g,0.5% of mass initiator ratio to monomer and the reaction time is 3 hours,Using 508 nm as excitation wavelength,the fluorescence spectrum of the complex has a characteristic absorption peak of europium at 612 nm.Thermogravimetric (TG) experiments show that the initial thermal decomposition temperature of PVAc and PVAc-Eu are 300 ℃ and 86 ℃,respectively. References | Related Articles | Metrics

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Preparation and performance evaluation of Lycium barbarum polysaccharide mask LIU Yi, GUO Yu-chen, CAI Lin-jun, LONG Xiao-yan 2018, 48 (11):  637-642.  doi: 10.13218/j.cnki.csdc.2018.11.007 Abstract ( 369 )   PDF (4938KB) ( 290 )   A new type of gel mask was prepared from konjac flour and Chinese wolfberry,and its process and properties were investigated.The results show that the superior formula of konjac wolfberry gel mask is:3% of konjac flour,6% of glycerin,0.2% ofLycium barbarum polysaccharide and 2% of sorbitol,forming a gel at room temperature.The inhibition rate ofLycium barbarum polysaccharide on hydroxyl radical,DPPH free radical and tyrosinase is 51.9%,87.7% and 51.1%,respectively.For gel mask,the moisture retention rate reaches 81.6% within 25 min at 25 ℃;when the mask mass concentration is 0.5 g/mL,the inhibition rate on hydroxyl radicals is 37.4%;when the mask mass concentration is 0.25 g/mL,the inhibition rate on DPPH free radicals is 61.7%. References | Related Articles | Metrics

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Preliminary study on the therapeutic effect of glabridin on mouse psoriasis model HONG Ting, LIU Xiao-ying, CHE Biao, TANG Jian, LIU Guang-rong, DU Zhi-yun 2018, 48 (11):  643-646.  doi: 10.13218/j.cnki.csdc.2018.11.008 Abstract ( 299 )   PDF (3154KB) ( 248 )   To explore the role of glabridin in the treatment of psoriasis,the model of auricle swelling and back skin damage induced by imiquimod emulsion (IMQ) in mouse were established,and then different doses of PT were given according to the standard of human skin administration.Results show that the PT contents of 30 and 15 g/kg have significant inhibitory effects on the degree of auricle swelling in mouse,and the inhibitory rate is 68.37% and 56.98% respectively.In the meantime,the psoriasis area severity index (PAIS) was scored on the back skin erythema,scale and thickness of the mouse.The trend line was drawn to observe the changes of skin lesions in each group.At 30 g/kg,PT has significant inhibitory effect on skin lesions of mouse. References | Related Articles | Metrics

Reviews

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Research progress in synthesis of glycol-based Gemini surfactants GE Xiu-juan, GAO Wen-chao, HUANG Shuang-ping, LI Xing, WEI Wen-long, CHANG Hong-hong 2018, 48 (11):  647-655.  doi: 10.13218/j.cnki.csdc.2018.11.009 Abstract ( 275 )   PDF (7055KB) ( 58 )   The synthesis of cationic,anionic,nonionic and zwitterionic Gemini surfactants using ethylene glycol as raw materials has been reviewed.The synthetic routes have been summarized and analyzed,and the properties and applications of the products have been described.The Gemini surfactants with ethylene glycol as raw material have higher surface activity,lower critical micelle concentration,and good wetting and antibacterial properties,which have a wider application range. References | Related Articles | Metrics

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Research progress of multi-effect protective agents for navy personnel HAN Ling, LU Ying, LI Jia-xin, SUN Zhi-guo, LIU Jun-jie 2018, 48 (11):  656-660.  doi: 10.13218/j.cnki.csdc.2018.11.010 Abstract ( 273 )   PDF (5799KB) ( 254 )   Among the military training injuries of navy personnel,sunburn and jellyfish stings are shown to have high incidence.Therefore,in terms of sunburn protection,the effects of ultraviolet radiation on human body and three kinds of sunscreens (inorganic,organic and natural sunscreens) were introduced.In the protection of jellyfish stings,the structure of jellyfish’s nematocysts,mechanism of stings and protective agents of jellyfish stings were reviewed.Considering that similar products are already available abroad,it is feasible to create a multi-effect protective agent combining sunburn protection and jellyfish sting protection. References | Related Articles | Metrics

Analytical methods and testing

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Determination of sodium copper chlorophyllin in toothpaste by high performance liquidchromatography LI Yu-jing, WANG Xue-ping 2018, 48 (11):  661-664.  doi: 10.13218/j.cnki.csdc.2018.11.011 Abstract ( 392 )   PDF (3442KB) ( 256 )   The sodium copper chlorophyllin in toothpaste was adsorbed by polyamide under acidic conditions,eluted by desorption,separated by YMC Carotenoid C30 chromatographic column (4.6 mm×250 mm,3 μm),and detected by photodiode array detector (PDA).A method for the determination of sodium copper chlorophyllin in toothpaste by high performance liquid chromatography (HPLC) was established.The sample was subjected to gradient elution with methanol-tert-butyl methyl ether-0.5% acetic acid mixed solution as a mobile phase at a flow rate of 1.0 mL/min,a column temperature of 30 °C,and a detection wavelength of 405 nm.The results show that sodium copper chlorophyllin a and sodium copper chlorophyllin b have a good linear relationship in the range of 5.0-100.0 mg/L,and the correlation coefficients are 0.999 8 and 0.999 7 respectively.The detection limits are 1.5 μg/kg;the limits of quantitation are 5.0 μg/kg;the recovery rate is 87.2%-97.8% and the relative standard deviation is 1.7%-2.9%. References | Related Articles | Metrics