• Title/Summary/Keyword: polyacrylic acid

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Selective Adsorption Properties of Carbonyl Compounds in Cigarette Mainstream Smoke by Hydrazine Impregnated Adsorbent (Hydrazine 첨착 흡착제에 의한 담배 주류연 중 카보닐 화합물의 선택 흡착 특성)

  • Park Jin-Won;Rhee Moon-Soo;Lee John-Tae;Hwang Keon-Joong;Hwang Taek-Sung
    • Journal of the Korean Society of Tobacco Science
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    • v.27 no.2
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    • pp.178-188
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    • 2005
  • To use the filter materials for selective removal of carbonyl compounds in cigarette mainstream smoke, hydrazine such as 2,4-dinitrophenylhydrazine and dansylhydraznie impregnated adsorbents were prepared with perchloric acid or phosphoric acid as a accelerator in hydrazone formation reaction. The change of morphology of adsorbents in various of impregnator were investigated by SEM. Impregnation amount caused by reaction time, acid type and impregnation reagent, and the adsorption properties of carbonyl compounds in cigarette mainstream smoke were investigated. Amounts of impregnation was increased as increasing reaction time. The removal amount for vapor phase carbonyl compounds by 2,4-DNPH impregnated adsorbent was higher than that of dansylhydrazine impregnated adsorbent. The selectivity of 2,4-DNPH impregnated polyacrylic type adsorbent was superior to those of other adsorbents. This results indicated that the 2,4-DNPH impregnated polyacrylic adsorbent was applicable to cigarette filter material because of its fast reactivity and porosity.

Partially Carbonized Poly (Acrylic Acid) Grafted to Carboxymethyl Cellulose as an Advanced Binder for Si Anode in Li-ion Batteries

  • Cho, Hyunwoo;Kim, Kyungsu;Park, Cheol-Min;Jeong, Goojin
    • Journal of Electrochemical Science and Technology
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    • v.10 no.2
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    • pp.131-138
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    • 2019
  • To improve the performance of Si anodes in advanced Li-ion batteries, the design of the electrode plays a critical role, especially due to the large volumetric expansion in the Si anode during Li insertion. In our study, we used a simple fabrication method to prepare Si-based electrodes by grafting polyacrylic acid (PAA) to a carboxymethyl cellulose (CMC) binder (CMC-g-PAA). The procedure consists of first mixing nano-sized Si and the binders (CMC and PAA), and then coating the slurry on a Cu foil. The carbon network was formed via carbonization of the binders i.e., by a simple heat treatment of the electrode. The carbon network in the electrode is mechanically and electrically robust, which leads to higher electrical conductivity and better mechanical property. This explains its long cycle performance without the addition of a conducting agent (for example, carbon). Therefore, the partially carbonized CMC-g-PAA binder presented in this study represents a new feasible approach to produce Si anodes for use in advanced Li-ion batteries.

Influence of the Binder Types on the Electrochemical Characteristics of Si-C Composites Electrode in LIBs (Si-C 복합체 전극의 바인더 종류에 따른 전기화학적 특성 변화)

  • Jung, Sung-Hun;Ji, Mijung;Park, Geunyeong;Hong, Jongill;Choi, Byung-Hyun
    • Journal of the Korean Ceramic Society
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    • v.50 no.2
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    • pp.168-172
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    • 2013
  • This work presents the effects of binders on the electrochemical performance of Si-C composites as the anode of lithium ion batteries. PAI (polyamide-imide) was used as an organic binder, and PAN (polyacrylonitrile), PAA (polyacrylic acid) and CMC + SBR (carboxymethyl cellulose + styrene-butadiene rubber) were used as aqueous binders. As a result, stabilization time for the cell with a Si-C composite anode synthesized using aqueous binders became shorter than an organic binder. Particularly in the case of the cell using PAA binder, better performance was observed in terms of adhesion strength, initial efficiency, the volume expansion ratio, Coulombic efficiency, and capacity retention.

The Strength and Durability of Polymer-Cement Mortars (폴리머-시멘트 모르타르의 강도와 내구성)

  • Hwang, Eui-Hwan;Hwang, Taek-Bung;Ohama, Yoshihiko
    • Applied Chemistry for Engineering
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    • v.5 no.5
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    • pp.786-794
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    • 1994
  • The strength and durability of polymer-cement mortars were investigated. The specimens of polymer-cement mortar were prepared by using styrene-butadiene rubber(SBR) latex, ethylene-vinyl acetate(EVA) emulsion and polyacrylic ester(PAE) emulsion with various polymer-cement ratios(5, 10, 15, 20wt%). For the evaluation of durability of polymer-cement mortars, freezing-thawing, acid resistance and heat resistance tests were conducted. With an increase of polymer-cement ratio, the frost resistance of polymer-cement mortars was greatly improved, but acid and heat resistance were deteriorated. The compressive and flexural strengths of SBR polymer-cement mortars were improved with an increase of polymer-cement ratio, whereas those of EVA and PAE polymer-cement mortars reached maximum value at polymer-cement ratio of 10wt%.

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SYNTHESIS AND CHARACTERIZATION OF THE POLYCATIONS FOR THE PREPAEATION OF POLYION COMPLEX MEMBRANS

  • Jegal, J.G.;park, Y.I.;Kim, J.H.;Lee, K.H.
    • Proceedings of the Membrane Society of Korea Conference
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    • 1993.10a
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    • pp.58-58
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    • 1993
  • Pervaporation has become important as a method to separate liquid mixtures, sepecially azeotropic and close boiling-point mixtures. Especially, water-alcohol separations have been carried out a lot because of the practical interests in the industries. However, outstanding membranes with high selectivity and high permeability have not been available in common use yet. In order to separate selectively out the water mixed with alcohols with an aim of the purification of the alcohols, a membrane has tO have excellent affinity to water. Among the hydrophilic polymers, polyacrylic acid and poly(vinyl alcohol) are used widely. In recent years, ionomers and polyion complexes, better hydrophitic materials, start to be used. The polyion complex membranes, consisting of polyacrylic acid (PAA) and polycation, showed excellent permeation rates and selectivities. It was known that among the polycations, ioneries, which have quaternary ammonium groups in the backbone chain, were more effective in giving membranes of higher permselectivities. On this base, syntheses and characterizations of the polycations, with different chemical structures from the published ones, for the polyion complex membrane formation were studied in this paper.

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A STUDY ON THE BOND STRENGTH OF REPAIRED GLASS IONOMER CEMENTS (Repaired glass ionomer cement의 결합강도에 관한 연구)

  • Seo, Su-Jeong;Kim, Shin
    • Journal of the korean academy of Pediatric Dentistry
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    • v.23 no.2
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    • pp.347-355
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    • 1996
  • The purpose of this study was to compare the bond strengths of different kinds of glass ionomer cements (GIC), which is recently increasing the clinical application in the field of pediatric dentistry and measure the repaired bond strengths in order to examine the clinical applicabilty of partial repaired cases. By using one kind of the light cured type GIC and three kinds of the chemical cured type GIC, the bond strengths of the followings were compared : unrepaired group as control, repaired conditioning group, which was treated the repaired surface using 25% polyacrylic acid and repaired non-conditioning group without surface treatment. Three point bending test was performed under Universal Testing Machine in order to measure the compressive bond strengths. The results were as follows : 1. Light cured GIC had higher bond strength than chemical cured type GIC in both of repaired and unrepaired groups. 2. In repaired cases, all of the materials decreased the bond strength when compared to the control group. In the light cured type, the bond strength of repaired conditioning group decreased 31.6%, repaired non-conditioning group decreased 40.8%. In chemical cured types, the bond strength of repaired conditining group decreased 11.8%, repaired non-conditioning group decreased 20.9%. 3. All the materials, in the case of the chemical treatment on the repaired surface using 25% polyacrylic acid had higher bond strength than untreated but, lower than control group.

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Sem Study of the Adhesion of New Glass Ionomer Cements to Dentin (글라스 아이오노모 시멘트의 상아질 접착에 관한 주사전자현미경적 연구)

  • Pak, Jay
    • Journal of the Korean Academy of Esthetic Dentistry
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    • v.7 no.1
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    • pp.42-47
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    • 1998
  • This study was performed to compare the bonding mechanism of glass ionomers. In this study, hybrid glass ionomers were used for restoration(Fuji II LC, GC, Japan) as the material of choice. Two different etching solutions were used in this study, 35% phosphoric acid and 10% polyacrylic acid. The effect of two different conditioners to dentin surface of a primary molar was studied and compared by using scanning electron microscope. Further, the interface of the dentin surface and the hybrid glass ionomers were examined.

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THE EFFECT OF LIGHT CURED GLASS IONOMER CEMENT ON THE SHEAR BOND STRENGTH OF ORTHODONTIC BRACKETS (광중합형 글래스 아이오노머 시멘트 교정용 브라켓의 전단결합강도에 미치는 영향)

  • Kim, Cheol;Yoon, Young-Jooh;Kim, Kwng-Won
    • The korean journal of orthodontics
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    • v.27 no.2
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    • pp.327-334
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    • 1997
  • The purpose of this study was to evaluate clinical applicability of light cured glass ionomer cement as a othodontic adhesive. The metal brackets and plastic brackets were bonded with light cured glass ionomer cement(Fuji Ortho $LS^{(R)}$) after polishing with a slurry of pumice, surface conditioning with 10% polyacrylic acid and chemically cured resin(Mono-$Lok2^{(R)}$) after acid etching with 38% phosphoric acid on the extracted human bicuspids. The shear bond strength was tested with a universal testing machine(HGS-100A, Shimadzu Co., Japan) after storage in normal saline at $37^{\circ}C$ or 24 hours and 48 hours. The results were as follows: 1. The shear bond strength of light cured glass ionomer cement group polished with a slurry of pumice was significantly lower than that of chemically cured resin group(P<0.01). 2. The shear bond strength of light cured glass ionomer cement group conditioned with 10% polyacrylic acid was significantly lower than that of chemically cured resin group(P<0.01). 3. The shear bond strength of light cued glass ionorner cement group conditioned with 10% polyacrylic acid was slightly higher than that of light cured glass ionomer cement group polished with a slurry of pumice, but there was no significant difference(P>0.05). 4. There was no significant difference between metal bracket group and plastic bracket group irrelevant off enamel conditioning(P>005). In summary, although the shear bond strength of light cured glass lionomer cement was lower than that of chemically cured resin, it night be clinically applicable.

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Preparation of Hydrazine Impregnated Adsorbents and Selective Adsorption Properties for Carbonyl Compounds in Cigarette Mainstream Smoke (Hydrazine 첨착 흡착제의 제조 및 담배 주류연 중 카보닐 화합물의 선택 흡착 특성)

  • Lee, John-Tae;Park, Jin-Won;Lee, Jeong-Min;Rhee, Moon-Soo;Hwang, Keon-Joong;Hwang, Taek-Sung
    • Polymer(Korea)
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    • v.30 no.3
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    • pp.210-216
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    • 2006
  • To use the filter materials for selective removal of carbonyl compounds in cigarette mainstream smoke, hydrazine such as 2,4-dinitrophenylhydrazine (2,4-DNPH) and dansylhydrazine (DAH) impregnated adsorbents were prepared with perchloric acid or phosphoric acid as an accelerator in hydrazone formation reaction. Changes of molecular structure and morphology of adsorbents in various of impregnator were investigated by FTIR/ATR and SEM. Impregnation amount caused by reaction time, acid type and impregnation reagent, and the adsorption properties of carbonyl compounds in cigarette mainstream smoke were studied. Amounts of impregnation increased with increasing reaction time. The removal amount for vapor phase carbonyl compounds by 2,4-DNPH impregnated adsorbent was higher than that of dansylhydrazine impregnated adsorbent. The selectivity of 2,4-DNPH impregnated polyacrylic type adsorbent was superior to those of other adsorbents. This result indicates that the 2,4-DNPH impregnated polyacrylic adsorbent is applicable to cigarette filter material because of its fast reactivity and porosity.