Studies on Multihollow PUA-EMA-St Crosslinked Copolymer Beads: Synthesis and Hollow Structure

2011 ◽  
Vol 295-297 ◽  
pp. 60-63
Author(s):  
Wei Hong Sun ◽  
Xin Yan
Keyword(s):  
Suspension Polymerization ◽  
Crosslinking Agent ◽  
Hollow Structure ◽  
Copolymer Composition ◽  
Ethyl Methacrylate ◽  
Polyurethane Acrylate

The multihollow and elastomeric beads from polyurethane acrylate (PUA), ethyl methacrylate (EMA) and styrene (St) are prepared by suspension polymerization using n-heptane as porogen and 1,2-divinylbenzene (DVB) as crosslinking agent. The SEM results show that the beads of PUA-EMA-St crosslinked copolymers have many and large hollows on their surfaces and interiors, and the hollow sizes are dependence of the copolymer composition and the dosages of porogen. Average hollow diameters decrease as the dosages of the contents of PUA and porogen decrease.

scholarly journals New Thermo-Sensitive Hydrogel Based on Copolymer of 2-hydroxyethyl Acrylate and Ethyl Acrylate

2017 ◽  
Vol 19 (1) ◽  
pp. 47
Author(s):  
R.K. Rakhmetullayeva ◽  
A.N. Azhkeyeva ◽  
G.Zh. Yeligbayeva ◽  
Ye.M. Shaikhutdynov ◽  
G.A. Mun ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Crosslinking Agent ◽  
Three Dimensional ◽  
Ethyl Acrylate ◽  
Radical Copolymerization ◽  
Water Soluble ◽  
Copolymer Composition ◽  
Polymer Hydrogels ◽  
Hydrophobic Moiety ◽  
Sensitive Behavior

In this work firstly the thermo-sensitive polymer hydrogels were obtained by three-dimensional radical copolymerization of water-soluble HEA and hydrophobic monomer ethyl acrylate (EA) in the presence of crosslinking agent N,N’-methylenebisacrylamide (BAA). The hydrogels with certain copolymer compositions showed thermo-sensitive behavior in aqueous solutions. The regularity of complex formation of cross-linked copolymer HEA-EA with anionic and cationic surface-active substances have been studied. The swelling behavior of the hydrogels in cetylpyridinium bromide aqueous solutions was studied. Increased swelling of the hydrogels was observed in the surfactant solutions. The increased swelling was more prominent for the hydrogels with a higher content of the hydrophobic moiety in the copolymer composition and with the higher surfactant concentration. The reason for the observed phenomenon is discussed.

Indomethacin Molecular Imprinted Polymer Preparation, Characterization of Application

2012 ◽  
Vol 602-604 ◽  
pp. 785-789
Author(s):  
Zhi Dou Tan
Keyword(s):  
Water Samples ◽  
Suspension Polymerization ◽  
Tap Water ◽  
Crosslinking Agent ◽  
Thermal Polymerization ◽  
Imprinted Polymer ◽  
Strong Light ◽  
Relative Standard ◽  
Aqueous Solution Polymerization

In order to indomethacin (IDM) for imprinting molecular, acrylamide (AA) as functional monomer, ethylene glycol dimethacrylate (EGDMA two) as crosslinking agent, respectively by photopolymerization and thermal polymerization of two methods of aqueous solution polymerization, suspension polymerization preparation of molecularly imprinted polymer.The polymer adsorption experiments show that the use of light-polymerized specificity is strong; light initiated polymer used for sample determination and calibration experiments, results in tap water and river water samples in Enshi Qingjiang indomethacin recoveries were 84.3% and 87.1%, were higher than 80%.Tap water and the relative standard deviation (n = 3) were 3.96%, 14.2%, that can be used for the separation and enrichment of indomethacin in water samples.

Preparation of Salt-Resistance Superabsobent Microspheres by Inverse Suspension Polymerization

2011 ◽  
Vol 415-417 ◽  
pp. 1273-1278 ◽  
Author(s):  
Ming Zhou ◽  
Jin Zhou Zhao ◽  
Yan Yang
Keyword(s):  
Calcium Ion ◽  
Suspension Polymerization ◽  
Crosslinking Agent ◽  
Ammonium Persulfate ◽  
Salt Resistance ◽  
Sulphonic Acid ◽  
Sodium Ion ◽  
Nacl Solution ◽  
Acid Copolymer ◽  
Inverse Suspension Polymerization

Novel salt-resistance superabsobent microspheres based on acrylamide (AM), 2-acrylamido-2-methylpropane sulphonic acid (AMPS) by inverse suspension copolymerization using ammonium persulfate (APS) as the initiator and N,N-methylene bisacrylamide (MBA) as the crosslinking agent and surfactant PVA as disperse agent are prepared. The experimental results of salt-resistance superabsobent microspheres show the salt absorbency decreased with the increase of salt concentration; The maximum salt absorbency is 132g/g within 75min in 0.9% NaCl solution and the effect of calcium ion on salt absorbency is much greater than that of sodium ion. FTIR indicates the structure of the acrylamide and 2-acrylamido-2- methylpropane sulphonic acid copolymer. SEM indicates that the number of the micropores largely decreased with the water/oil ratio increasing from 4% to 10%. Elemental analysis indicate that the measured values of carbon, sulfur, nitrogen, hydrogen four elements is very close to theoretical value.

Effects of acrylonitrile water solubility on limiting conversion and copolymer composition in suspension polymerization

2002 ◽  
Vol 38 (7) ◽  
pp. 1337-1342 ◽  
Author(s):  
Qun Lu ◽  
Zhixue Weng ◽  
Shuxue Zhou ◽  
Zhiming Huang ◽  
Zuren Pan
Keyword(s):  
Water Solubility ◽  
Suspension Polymerization ◽  
Copolymer Composition

scholarly journals Double-Crosslinked Polyurethane Acrylate for Highly Conductive and Stable Polymer Electrolyte

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2557
Author(s):  
Han-Na Kim ◽  
Kyung-Geun Kim ◽  
Yeon Uk Jeong ◽  
Sung Yeol Kim
Keyword(s):  
Mechanical Properties ◽  
Ionic Conductivity ◽  
Polymer Electrolyte ◽  
Polymer Electrolytes ◽  
Crosslinking Agent ◽  
Optimum Conditions ◽  
Polyurethane Acrylate ◽  
Electrolyte Uptake ◽  
Electrochemical Storage ◽  
Major Factors

High ionic conductivity and good stability are major factors that influence the use of polymer electrolytes in electrochemical storage and conversion devices. In this study, we present polyurethane acrylate (PUA) membranes having enhanced ionic conductivity and swelling stability by double crosslinking the polyurethane (PU) and polyacrylate (PA) compartments. The crosslinking agent concentration was varied to control their mechanical properties, swelling stability, and ionic conductivity. Under optimum conditions, the electrolyte uptake of the double-crosslinked PUA membranes without notable defects was 245%. The maximum ionic conductivity of these membranes reached 9.6 mS/cm, which was higher than those with respect to most of the previously reported PUA- or PU-based polymer electrolytes.

scholarly journals Hydrogel Surface-Modified Polyurethane Copolymer Film with Water Permeation Resistance and Biocompatibility for Implantable Biomedical Devices

Micromachines ◽  
2021 ◽  
Vol 12 (4) ◽  
pp. 447
Author(s):  
Hey In Jeong ◽  
Dae Hyeok An ◽  
Jun Woo Lim ◽  
Taehoon Oh ◽  
Hojin Lee ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Crosslinking Agent ◽  
Copolymer Film ◽  
Vinyl Pyrrolidone ◽  
Copolymer Composition ◽  
Biomedical Devices ◽  
Water Permeation ◽  
Hydrogel Surface ◽  
Surface Modified ◽  
Implantable Biomedical Devices

To use implantable biomedical devices such as electrocardiograms and neurostimulators in the human body, it is necessary to package them with biocompatible materials that protect the internal electronic circuits from the body’s internal electrolytes and moisture without causing foreign body reactions. Herein, we describe a hydrogel surface-modified polyurethane copolymer film with concurrent water permeation resistance and biocompatibility properties for application to an implantable biomedical device. To achieve this, hydrophobic polyurethane copolymers comprising hydrogenated poly(ethylene-co-butylene) (HPEB) and aliphatic poly(carbonate) (PC) were synthesized and their hydrophobicity degree and mechanical properties were adjusted by controlling the copolymer composition ratio. When 10 wt% PC was introduced, the polyurethane copolymer exhibited hydrophobicity and water permeation resistance similar to those of HPEB; however, with improved mechanical properties. Subsequently, a hydrophilic poly(vinyl pyrrolidone) (PVP) hydrogel layer was formed on the surface of the polyurethane copolymer film by Fenton reaction using an initiator and crosslinking agent and the effect of the initiator and crosslinking agent immobilization time, PVP concentration and crosslinking agent concentration on the hydrogel properties were investigated. Finally, MTT assay showed that the hydrogel surface-modified polyurethane copolymer film displays excellent biocompatibility.

Synthesis of Acrylic High-Oil Absorption Resins

2012 ◽  
Vol 502 ◽  
pp. 222-226 ◽  
Author(s):  
Xiao Hua Wang
Keyword(s):  
Polyvinyl Alcohol ◽  
Reaction Temperature ◽  
Absorption Rate ◽  
Suspension Polymerization ◽  
Crosslinking Agent ◽  
Absorption Capacity ◽  
Process Conditions ◽  
Oil Absorption ◽  
Absorptive Power ◽  
Suitable Process

Through suspension polymerization , the influences of different crosslinking agent, initiator, disperser and reaction temperature on oil absorption rate of cetane methacrylate highly oil absorptive resin were studied. The oil absorption ability of the resin for different oil was investigated. The results show the oil absorption capacity of synthesized resins was good with crosslinker divinylbenzene(DVB), initiator benzoyl peroxide(BPO) and disperser polyvinyl alcohol(PVA). Suitable process conditions were: crosslinker DVB 1.0%, initiator BPO 1.2%, disperser PVA 0.8%, reaction temperature 70°C, and oil absorptive power of obtained resin is about 36.6g.g-1 for CC14.

Preparation and Characterization of Magnetic Toner Particles by Direct Polymerization Method

2011 ◽  
Vol 217-218 ◽  
pp. 1702-1707
Author(s):  
Yu Feng Duan ◽  
Zhao Xia Fu
Keyword(s):  
Particle Size ◽  
Glass Transition ◽  
Influence Factor ◽  
Suspension Polymerization ◽  
Spherical Surface ◽  
Crosslinking Agent ◽  
Polymerization Process ◽  
Stirrer Speed ◽  
Sem Image ◽  
Polymerization Method

In this study a kind of black toner, containing polymer, magnetic iron oxide pigment, and several other additives, was prepared by a suspension polymerization method. The morphology, influence factor of particle size, and glass transition of prepared toner were discussed. SEM image showed that the produced micron-sized particles have a spherical surface and the various chemicals were mixed into monomers during manufacturing of the particles. Discussion about particle formation and stability concluded that the toner particle size related with stabilizer concentration, stirrer speed, and crosslinking agent concentration. The bigger particles, resulted from droplets coalescence during polymerization process, disappeared when enough PVA stabilizer was used in the aqueous medium. .Increasing the stirrer speed corresponded to the decrease of the particles size. But any increase in stirrer speed t did not contribute to size reduction in small particles below 2μm. It was found that particle size decrease with the addition of crosslinking agent. The DSC result indicated the glass transition of polymerized toner could be effectively adjusted according to Fox equation through change the monomer ratio.

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