Papers by Keyword: Polyacrylate

Abstract: Nano-TiO₂ Modified Fluorine-Containing Polyacrylate Soap-Free Emulsion was Successfully Synthesized via Soap-Free Emulsion Polymerization Technique, in which the Polymerization Monomers Consisted of Methyl Methacrylate (MMA), Butyl Acrylate (BA) and Dodecafluoroheptyl Methacrylate (DFMA). the Influence of Amount of Initiator, Emulsifier, Containing Fluorine Monomer and nano-TiO₂ on the Performance of Emulsion was Investigated. the Results Showed that the Good Polymerization Stability, and High Monomer Conversion were Obtained when the Amount of Ammonium Initiator was 1.2%, the Amount of Reactive Emulsifier was 3.5%. with Increasing Amount of DFMA, the Monomer Conversion Decreased and the Gel Rate Increased Gradually with the Increase of DFMA Amount. UV-Blocking Ability of the Cotton Fabric Treated with the Hybrid Emulsion Containing Nano-Tio₂ increased with Increasing Amount of Nano-TiO₂. IR Spectrum Results Showed that Nano-TiO₂ and Fluorine-Containing Monomer were Successfully Introduced in the Segmental Structure of the Polymer. SEM Revealed that Nano-TiO₂ was Loaded on the Surface of the Treated Cotton Fabric which had Good Hydrophobicity.

Abstract: Polymerized rosin/polyacrylate composite miniemulsions were prepared by in-situ semi-continuous miniemulsion polymerization method with polymerized rosin as tackifying resin. The effect of polymerized rosin amount on the monomer conversion rate, the water absorption rate, adhesion properties including initial force, 180^o peel strength and shear resistance of the composite latex films were studied, and the structure was also characterized by FTIR and DSC. The results showed that polymerized rosin played the role of inhibition and chain transfer agent in the polymerization process. Polymerized rosin was compatible well with polyacrylate. With the introduction of polymerized rosin, the water absorption rate and heat resistance of the composite latex films were not decreased. When polymerized rosin amount was 3%, the initial force, 180^o peel strength and shear resistance of the composite latex films were 13 #, 200 N/m and 21 h, respectively.

Abstract: 3-hydroxy-2, 2-bis(hydroxymethyl) propyl dihydrogen phosphate(HBPDP) was synthesized, intumescent flame retardant composite powder (IFRC) was prepared by compounding ammonium polyphosphate, melamine and HBPDP with TX-10 surfactant/polyacrylate latex. The HBPDP was characterized with FTIR and ¹HNMR. The IFRC was measured with thermogravimetric analysis. The data showed that the IFRC can meet the need of the processing temperature of most of thermoplastic.

Abstract: The core-shell nanocomposite particles were prepared from acrylate monomers and octavinyl polyhedral oligomeric silsesquioxane (V-POSS) by emulsion polymerization. The structure and properties of emulsion and latex film were characterized by FT-IR, dynamic mechanical analysis (DMA) and TEM and laser particle diameter analyzer (LPDA). The results showed that the V-POSS/polyacrylated (V-POSS/PMA) composite latexes was prepared and the diameter is about 36.1 nm when added 5wt% V-POSS. DMA results showed that the mechanical loss (tanδ) peak temperature (T_p) of the film enhance with increasing V-POSS content and had the best high T_p at 88.4°C for added 7 wt% V-POSS, which increased 7.8 °C than had not V-POSS. Thermogravimetric analysis (TGA) showed that the addition of V-POSS can increase the thermal decomposition temperature and improved the thermal stability of polyacrylate.

Abstract: Porous properties have notable effect on separating effect of organic polymer-based monolithic column. Different applications of monolithic columns require tailored pore size distributions. On account of that, P(GMA-co-EGDMA) monolithic columns were prepared with novel ternary porogenic agents. Glass tubes was chosen as polymerization mold. Moreover, factors influencing the inner pore morphology, pore size and specific surface area were investigated systematically. The results showed that the increasing of the solubility of porogenic agents and the amount of crosslinker, the decreasing of the amount of porogenic agents and temperature rising all could give rise to the decreasing of pore size. Remarkably, the effect of initiator was studied for the first time. The results showed that amount of initiator had no remarkable influence on porous properties. By controlling effect factors, P(GMA-co-EGDMA) Monolithic Columns with pore size from dozens to thousands of nanometer, which can be applied in separation of molecules with different size.

Abstract: In the modern world, the theme of low carbon economic development trend advocates energy conservation and discharge reduction, and the energy-saving technology of thermal insulation film of automobile glass and construction glass has attracted increasing more attention. This paper adopts liquid phase precipitation process to prepare nanoSnO₂ polyacrylate thermal insulation organic film: first, select precursor solution concentration in favor of generating outphase precipitation and pH value to prepare SnCl₄ solution with low concentration 2 mM-10 mM, and hydrochloric acid with concentration 0.1 M-0.4 M; select methyl methacrylate 34.5%-90%, BA 10%-35.5%, MAA 0%-30% and AIBN 0.1%-0.3% to prepare polyacrylate film; put the prepared PA film in SnCl solution, control reaction temperature to be 40°C-80°C, maintain reaction time 6-18h, take out the film, wash and dry to get nanoSnO₂ organic thermal insulation film. According to XRD analysis and SEM observation, SnO₂ is uniformly deposited on the surface of organic film, having good thermal insulation performance.

Abstract: Polyacrylate microsphere with different core/shell ratio (mass ratio) were prepared by semi-continuous seed emulsion copolymerization using butyl acrylate (BA) and methyl methacrylate (MMA) as main monomers，which were used to toughen polylactic acid (PLA) after drying. The effect of core/shell ratio of polyacrylate toughening agent (ACR) on mechanical properties of PLA was studied. The results showed that when adding 8wt%ACR, the impact strength and elongation at break of PLA were both first increased and then decreased as increasing of core/shell ratio, while the tensile strength loss of PLA was little changed. It is found that the impact strength was increased about 24% than that of neat PLA as well as the elongation at break was increased from 2% to 12% when the ratio was 7/3, which was the best ratio.

Abstract: Soft-core/hard-shell polyacrylate latex with different cross-linking degree and shell thickness were prepared by semi-continuous seed emulsion copolymerization .The size, size distribution and morphology of latex particles were characterized using dynamic light scattering (DLS) and scanning electron microscopy (SEM). The properties of plastisol were investigated by testing their dynamic viscoelasticity and storage stability as well as the mechanical properties. The results showed that the latex particles always keep regular spherical structure throughout the polymerization process; Dynamic viscoelasticity of plasticized system with different cross-linking degree however had little changed. The mechanical properties of the plastigels could be improved by increasing the thickness of shell.

Abstract: Six groups of polyacrylate binders are prepared with emulsion polymerization technique. D4 and ethenylsiloxane as modified monomers. Methyl acrylate (MA), butyl acrylate (BA) and styrene (St) are employed as basic polymerizing monomers; acrylic acid (AA) as catalyzer; glycidyl methacrylate (GMA) as reactive monomers; VTMS as coupling agent;sodium dodecylsulfate (SDS), composite fatty alcohol ether polyethylene oxide (composite AEO) as emulsifier and ammonium persulfate (APS) as initiator. The time and dosage of D4/initiator and dosage of coupling agent are changed for their effects on the reaction conversion rate and gel rate. Then, comparison with normal PA and green PA in the adhesivity, staining resistance, yellowing resistance, water tolerance and pliability of binders are carried. The studies show that the green silicone polyacrylate binder have the better comprehensive properties with D4 5% (on mass of monomers ) and ethenylsiloxane 1% (on mass of D4).

Abstract: Hyperbranched polymer is a kind of non-linear polymers with highly branched structure and a lot of terminal groups. It has many advantages, such as high reactivity, good solubility and low viscosity. Hyperbranched polymer has become a focus in modern scientific domain. In this paper, polyester-type water-soluble hyperbranched monomer is prepared by the ring-opening polymerization reaction of maleic anhydride with polyol. Hyperbranched polyacrylate emulsion with 70-110nm was synthesized by emulsion polymerization using methyl methacrylate (MMA), butyl acrylate (BA), acrylic acid (AA) and hyperbranched polymer as comonomer. The effects of dosages and adding order of monomers, concentration of initator, type and amount of chain transfer agent on the polymerization are discussed. The as-prepared emusions were analyzed by FTIR, DSC, SEM. The solid content, particle size, stability of emulsion and morphology and water absorption of film were measured. The results showed that hyperbranched polyacrylate emulsion had low viscosity, high stability and can form very flat and smooth film. Hyperbranched polyacrylate emulsion can be widely applied in modern ink industry for its low cost,simple process and stable quality.