Properties and characterization of acrylic latex prepared with novel emulsifiers

2018 ◽  
Vol 9 (3-4) ◽  
pp. 145-151 ◽  
Author(s):  
Lijun Chen ◽  
Tantan Shao ◽  
Xin Zhang ◽  
Xiuming Wang ◽  
Dawei Chen
Keyword(s):  
Mixed Surfactants ◽  
The Novel ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Seeded Emulsion Polymerization ◽  
Scanning Calorimetry ◽  
Acrylic Latex ◽  
Properties And Characterization ◽  
Alkyl Polyglycoside

The polyacrylate latex has been successfully prepared by semicontinuous seeded emulsion polymerization with methyl methacrylate (MMA), butyl acrylate (BA), and acrylic acid (AA), which were initiated with potassium persulfate and emulsified with the novel green mixed surfactants of alkyl polyglycoside (APG1214) and disodium laureth sulfosuccinate (MES). The particle size of the latex was measured by Zetatrac dynamic light scattering detector. The structure of the latex was tested by Fourier-transform infrared spectroscopy. The film of latex was tested by differential scanning calorimetry and thermogravimetric analysis. Factors, which had an influence on the properties of the latex, were studied in detail. The optimum conditions for preparing the polyacrylate latex were as follows: the amount of emulsifiers was 7.0%, the mass ratio of APG1214 to MES was 3:1, the amount of the initiator was 0.7%, the mass ratio of MMA to BA was 1:1, and the amount of AA was 2.0%. In this case, the conversion of the mixed monomers was high and the mechanical and ionic stability of the latex was good.

Preparation and characterisation of modified VAc-VeoVa10 latex

2019 ◽  
Vol 48 (3) ◽  
pp. 210-215 ◽  
Author(s):  
Yilu Gong ◽  
Tantan Shao ◽  
Xiuming Wang ◽  
Xin Zhang ◽  
Zhijuan Sun ◽  
...  
Keyword(s):  
Vinyl Ester ◽  
Water Repellency ◽  
Latex Film ◽  
Mixed Surfactants ◽  
The Novel ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Content Type ◽  
Emulsion Polymerisation ◽  
Silicon Materials

Purpose Fluorine and silicon materials have received the keen attention of many researchers because of their water repellency and low surface free energy. The purpose this study was to prepare vinyl acetate (VAc)-vinyl ester of neodecanoic acid (VeoVa 10) copolymer latex modified with fluorine and silicone monomer, which is emulsified with the novel surfactants of disodium laureth sulfosuccinate (MES) and octylphenol polyoxyethylene ether (OP-10). Design/methodology/approach A series of modified latices containing fluorine-silicon have been prepared by semi-continuous seeded emulsion polymerisation of mixed monomers of VAc, VeoVa10, hexafluorobutylmethacrylate (HFMA) and vinyltriethoxysilane (VTES) and emulsified by novel surfactants of MES and OP-10. Findings The optimum conditions for preparing the modified latex is as follows: the amount of the surfactant was 4.0 Wt.% and the mass ratio of the anionic and nonionic surfactant was 3:1; the dosage of initiator was 0.4 Wt.% and the mass ratio of the main monomer was 3:1; and the amounts of VTES and HFMA were 2.0 and 6.0 Wt.%, respectively. In comparison with the conventional latex, the hydrophobicity of latex film was improved further. Originality/value The modified p (VAC-VeoVa) latex is prepared via semi-continuous seeded emulsion polymerisation, which is emulsified with the novel mixed surfactants of MES and OP-10. There are two main innovations. One is that the novel p (VAC-VeoVa) latex containing fluorine-silicon is prepared successfully. The other is that the emulsifier is composed of the novel mixed surfactants of MES and OP-10.

Preparation and characterization of novel VAc/VeoVa10/DBM/VTES quadripolymer latex emulsified with green surfactants

2019 ◽  
Vol 35 (4) ◽  
pp. 188-197
Author(s):  
Lijun Chen ◽  
Tantan Shao ◽  
Yilu Gong ◽  
Xiuming Wang
Keyword(s):  
Contact Angle Measurement ◽  
Angle Measurement ◽  
Chemical Compositions ◽  
The Novel ◽  
Mass Ratio ◽  
Seeded Emulsion Polymerization ◽  
Scanning Calorimetry ◽  
Water Contact ◽  
Vinyl Silane ◽  
Dibutyl Maleate

The novel vinyl acetate (VAc)/vinyl neo-decanoate (VeoVa10)/dibutyl maleate/triethoxy vinyl silane quadripolymer latex was prepared via the semi-continuous seeded emulsion polymerization emulsified with disodium laureth sulfosuccinate (AEMES) as anionic surfactant and beta-cyclodextrin (β-CD) mixture as emulsifier and initiated with potassium persulfate (KPS), respectively. The chemical compositions of copolymer was determined by Fourier transform infrared spectromer (FTIR). The glass transition temperature ( Tg) of the copolymer was measured by differential scanning calorimetry. The water resistance of the film was assessed by the water contact angle measurement. The conditions of preparing the novel latex were optimized and obtained as follows. The amount of AEMES and β-CD mixtures were 6 wt% and the mass ratio of AEMES to β-CD were 1:1. The dosage of KPS was 0.6 wt% and the mass ratio of VAc to VeoVa10 was 3:1. The amount of dibutyl maleate and triethoxy vinyl silane was 4% and 3%, respectively. In this case, the conversion percentage of the mixed monomers was 99.0% and the polymerization stability was good.

Synthesis and characterization of fluoro-silicone polyacrylate latex emulsified with novel green surfactants

2018 ◽  
Vol 35 (2) ◽  
pp. 102-114
Author(s):  
Lijun Chen ◽  
Tantan Shao ◽  
Yilu Gong
Keyword(s):  
The Novel ◽  
Seeded Emulsion Polymerization ◽  
Hydrophobic Property ◽  
Scanning Calorimetry ◽  
Potassium Persulphate ◽  
Functional Monomers ◽  
High Conversion Rate ◽  
Stability Results ◽  
Mixed Emulsifier

The novel fluoro-silicone polyacrylate latex was successfully synthesized in the presence of a novel green mixed emulsifier of β-cyclodextrin ( β-CD) and sodium lauroyl glutamate (SLG) by semi-continuous seeded emulsion polymerization, which was initiated with potassium persulphate. Methyl methacrylate (MMA) and butyl acrylate (BA) were used as the main monomers, while hexafluorobutyl methacrylate (HFMA) and vinyltriethoxysilane (VTES) were used as the functional monomers. The resultant latex and its film were characterized by Fourier transform infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry and contact angle determinator, respectively. The optimum conditions of preparing the fluoro-silicone polyacrylate latex are as follows: the amount of compound emulsifiers are 7.0%; β-CD: SLG = 1:2; the amount of initiator is 0.7%; the appropriate proportion of main monomer of MMA: BA = 1:1; and the amounts of HFMA and VTES are 6.0% and 4.0%, respectively. In this case, the resultant latex has high conversion rate, low gel rate and good stability. Results showed that both thermal stability and hydrophobic property of the latex are improved with the incorporation of a small amount of HFMA and VTES.

Synthesis and characterization of diaminomaleonitrile-functionalized polystyrene grafts for application in pervaporation separation

2008 ◽  
Vol 62 (4) ◽  
Author(s):  
Hamada Abdel-Razik
Keyword(s):  
Chemical Structure ◽  
Thermal Characteristics ◽  
Gravimetric Analysis ◽  
Thermal Gravimetric ◽  
Optimum Conditions ◽  
Scanning Calorimetry ◽  
Phenol Water ◽  
Pervaporation Separation ◽  
Thermal Stability Of

AbstractSynthesis, characterization and application of diaminomaleonitrile (DAMN)-functionalized polystyrene grafts were studied. Dibenzoyle peroxide (BP) was used as an initiator. Optimum conditions for grafting were found to be c(DAMN) = 0.5 M, c(BP) = 0.016 M, θ = 85 °C and t = 4 h. Water uptake of the polystyrene graft membranes was found to increase with the increase of the grafting yield. The chemical structure, thermal characteristics and thermal stability of the obtained membranes were investigated by means of FTIR spectroscopy, differential scanning calorimetry, and thermal gravimetric analysis. Polystyrene graft membrane with the degree of grafting of up to 96 % was found to be useful for the pervaporation separation of phenol/water mixtures.

Synthesis and properties of novel self-crosslinked cationic fluorinated acrylic latex prepared with novel emulsified system

2016 ◽  
Vol 45 (4) ◽  
pp. 259-264
Author(s):  
Wen Li ◽  
Zhongbin Bao ◽  
Lijun Chen ◽  
Dongshun Deng
Keyword(s):  
Particle Size ◽  
Gemini Surfactants ◽  
Average Particle Size ◽  
Water Soluble ◽  
Average Particle ◽  
Mixed Surfactants ◽  
The Novel ◽  
Content Type ◽  
Acrylic Latex ◽  
Emulsion Polymerisation

Purpose At present, the conventional method of preparing cationic fluorinated acrylic latex is to emulsify copolymerised monomers with cationic surfactants. However, there has been a wide concern about using Gemini surfactants to prepare cationic polymer latex to improve its properties. The purpose of this paper was to focus on the synthesis of novel self-crosslinked cationic fluorinated acrylic latex (SCFAL), during which the copolymerised monomers were initiated with a water soluble azo initiator and emulsified with mixed surfactants of Gemini emulsifier and alkyl polyglycoside (APG). Design/methodology/approach The novel SCFAL was prepared successfully by the semi-continuous seeded emulsion polymerisation of butyl acrylate, methyl methacrylate, hexafluorobutyl methacrylate (HFMA) and hydroxy propyl methacrylate (HPMA) in aqueous medium. Findings The conversion is the maximum and the coagulation percentage the minimum when the amounts of emulsifier and initiator are 8 and 0.6 per cent, respectively. The average particle size of the latex is significantly reduced with the increase of the amount of emulsifiers used. However, the average particle size of the latex is increased with the increase of the amount of HPMA. The particle size of the latex is of a unimodal distribution, which means that the particle size was reasonably uniform. Contact angle is increased with the increase of the amount of the HFMA. Practical implications The novel SCFAL can be widely used as significant components in the field of coatings, leather, textile, paper, adhesives and so on. Originality/value SCFAL, which was emulsified with novel mixed surfactants of Gemini surfactant and APG, has been prepared successfully. Influences of amount of initiator, emulsifier, HPMA and HFMA on emulsion polymerisation and/or properties of novel latex are investigated in detail.

Synthesis and characterisation of fluorine-silicon acrylate latex emulsified by novel green surfactants

2018 ◽  
Vol 47 (3) ◽  
pp. 255-260 ◽  
Author(s):  
Lijun Chen ◽  
Xin Zhang ◽  
Cuifeng Zhang ◽  
Zhongbin Bao ◽  
Tingting Xu
Keyword(s):  
Water Resistance ◽  
Mixed Surfactants ◽  
Mass Ratio ◽  
Acrylic Copolymer ◽  
Content Type ◽  
Acrylate Copolymer ◽  
Emulsion Polymerisation ◽  
Alkyl Polyglycoside ◽  
Acrylate Latex ◽  
Practical Implications

Purpose Motivated by the globally increasing concern over environmental protection, the interest of a large part of the scientific community focuses on the development of green surfactants aiming to replace traditional toxic surfactants-based alternatives. The purpose of this paper is to prepare acrylate copolymer latex modified with fluorine and silicone monomer, which is emulsified with the green surfactants of sodium rosinate and alkyl polyglycoside (APG). Design/methodology/approach A series of acrylic copolymer latexes containing fluorine–silicon have been prepared by semi-continuous seed emulsion polymerisation of mixed monomers of methyl methacrylate (MMA), butyl acrylate (BA), hexafluorobutylmethacrylate (HFMA) and vinyltriethoxysilane (VTES) and emulsified by green mixed surfactants of sodium rosinate and APG. Findings The optimum recipe of preparing the emulsion is as follows: the amount of emulsifiers is 6 per cent and the mass ratio of sodium rosinate to APG is 1:3. The amount of initiator is 0.4 per cent, and the amounts of the silicon monomer and fluorine monomer are 5 and 7 per cent, respectively. In comparison with the acrylate latex prepared without fluorine monomer and silicon monomer, the thermal stability and the water resistance of the film of the resultant latex clearly improved. Practical implications The acrylic copolymer latexes containing fluorine–silicon emulsified with green surfactants can be used in the coatings, adhesives, finishing agents and so on. Originality/value The acrylic copolymer latexes containing fluorine–silicon have been prepared by semi-continuous seed emulsion polymerisation. The green mixed surfactants of sodium rosinate and APG have been used as the emulsifiers to replace traditional toxic surfactants-based alternatives.

Synthesis and characterization of novel tetrakis (3-hydroxypropylmercapto)-substituted phthalocyanines

2013 ◽  
Vol 17 (06n07) ◽  
pp. 573-586 ◽  
Author(s):  
Çiğdem Yağcı ◽  
Ahmet Bilgin
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Properties ◽  
Synthesis And Characterization ◽  
The Novel ◽  
Scanning Calorimetry ◽  
Metal Free ◽  
Visible Spectra ◽  
Ft Ir ◽  
Aromatic Nitro

A phthalonitrile precursor 4-(3-hydroxypropylmercapto)phthalonitrile (3) was synthesized via a base-catalyzed nucleophilic aromatic nitro displacement of 4-nitrophthalonitrile with the 3-mercapto-1-propanol. A novel tetrasubstituted metal-free phthalocyanine (4) ( M = 2 H ) and its metal complexes (5–8) ( M = Zn , Ni , Cu and Co ) bearing 3-hydroxypropylmercapto moieties were prepared by the cyclotetramerization reaction of (3) with the appropriate materials. The visible spectra of the zinc(II) phthalocyanine (5) was recorded with different concentrations and different ions as Ag +, Hg 2+ and Pb 2+ in DMF and also with different solvents as dimethylformamide and pyridine. Fluorescence spectrum of the compound (5) was also studied. Temperature and frequency dependence of AC conductivity for (4–8) was investigated in air and under vacuum and were found to be ~10-8–10-5 S.m-1. Thermal properties of the phthalocyanines were examined by differential scanning calorimetry. All the novel compounds have been characterized by elemental analysis, UV-vis, FT-IR, NMR and MS spectral data and DSC techniques.

scholarly journals Development and Characterization of Novel Active Chitosan Films Containing Fennel and Peppermint Essential Oils

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 936 ◽  
Author(s):  
Ting Liu ◽  
Jingfan Wang ◽  
Fumin Chi ◽  
Zhankun Tan ◽  
Liu Liu
Keyword(s):  
Essential Oil ◽  
Composite Films ◽  
Environmental Scanning Electron Microscopy ◽  
Chitosan Film ◽  
Environmental Scanning ◽  
The Novel ◽  
Scanning Calorimetry ◽  
Chitosan Films ◽  
Water Swelling

The effects of fennel essential oil (FEO) and peppermint essential oil (PEO) on chitosan-based films were evaluated in this study. The results showed that the addition of FEO and PEO slightly increased the density and thickness, while significantly decreasing the moisture content, water swelling, and solubility properties. The color values (L, a, b, ΔE and whiteness index (WI)) of the composite films containing FEO and PEO changed obviously with a tendency toward yellowness, which was beneficial in resisting food decomposition caused by ultraviolet light. The differential scanning calorimetry (DSC) and fourier-transform-infrared (FTIR) results indicated that the addition of FEO and PEO affected the structure of the chitosan films, while the interaction between the chitosan and polyphenols in FEO and PEO established new hydrogen bonds and improved the thermal stability. The environmental scanning electron microscopy (ESEM) illustrated that the surfaces of the composite films containing FEO and PEO were smooth, but the cross-section was rougher than in pure chitosan film. Furthermore, the composite films containing FEO and PEO exhibited prominent antioxidant activity. In short, the novel active chitosan-based films with incorporated FEO and PEO present broad application prospects in fresh-cut meat or vegetable packaging.

Characterization of Spin Coated Nondoped and In-Doped ZnO Films Using Novel Precursor Solution

2012 ◽  
Vol 725 ◽  
pp. 277-280 ◽  
Author(s):  
Koichiro Inaba ◽  
Yujin Takemoto ◽  
Kouji Toyota ◽  
Kenichi Haga ◽  
Kouichi Tokudome ◽  
...  
Keyword(s):  
Precursor Solution ◽  
Optical Transmittance ◽  
Film Deposition ◽  
Zno Films ◽  
The Novel ◽  
Zno Film ◽  
Scanning Calorimetry ◽  
Doped Zno ◽  
Ether Solvents

A novel precursor for ZnO film deposition with Zn-O structure was synthesized by the reaction of diethylzinc and water in some ether solvents. The novel precursor was characterized by 1H-NMR spectroscopy and differential scanning calorimetry (DSC). Nondoped and In-doped ZnO films on a glass substrate have been successfully grown by conventional spin coating using nondoped and In added novel precursor solution. The samples have an optical transmittance of more than 85%, and a smooth surface determined from optical transmittance and scanning electron microscopy, respectively. The sheet resistivity of In-doped ZnO films is lower than that of nondoped ZnO film.

Resistivity Characterization of Ti Based ATO and its Preparation

2014 ◽  
Vol 1004-1005 ◽  
pp. 380-384
Author(s):  
Long Yao Wang ◽  
Fan Rong Pan ◽  
Lan Wang
Keyword(s):  
Composite Material ◽  
Oxide Material ◽  
Mass Ratio ◽  
Optimum Conditions ◽  
Experimental Conditions ◽  
Coating Solution ◽  
Thermal Decomposition Method ◽  
Factors Influencing ◽  
Ti Particles

Antimony doped tin oxide (ATO) is an oxide material with well electrical conductivity. The composite material of Ti based ATO is prepared with Ti particles (45 μm) according to the thermal decomposition method. The resistivity of the material has been analyzed with a measurement device under 1.7 MPa in particles form. The factors influencing the resistivity were studied and optimized in this work. In order to minimize the resistivity of the material, the optimum conditions are putted forward as: mass ratio of coating solution 15% (SbCl3to SnCl4⋅5H2O), repeating coating process 20 times (coating with the solution and then dried at 100 °C), sintering at 450 °C for 15 min. Under the optimum experimental conditions, the resistivity of the composite particles is 232 Ω·m. Furthermore, ATO coating improved the properties of the composite material in the oxidation resistance.

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