Polymerization of Methyl Methacrylate with Nickel (II)a-Benzoinoxime Complex
Identifieur interne : 000581 ( Main/Exploration ); précédent : 000580; suivant : 000582Polymerization of Methyl Methacrylate with Nickel (II)a-Benzoinoxime Complex
Auteurs : Hafida Harrar-Ferfera [Algérie] ; Farouk Amrani [Algérie]Source :
- Journal of applied polymer science [ 0021-8995 ] ; 2008.
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Abstract
Polymerizations of methyl methacrylate (MMA) monomer initiated by a novel Ni(II)a-benzoinoxime complex have been achieved under homogeneous conditions in the 25-60°C temperature range. The activity for polymerization increases with reaction temperature and by carrying out the polymerization in solution of low-polarity solvents without any induction time. The obtained polymers have weight-average molecular weights about 105 and slight broad polydispersity indexes (2.2 < Mw/Mn ≤ 3.3). Dependence of rate constants polymerization and decomposition of initiator (kapp and kd, respectively) on temperature was investigated and activation parameters were computed from Arrhenius plot. 1H-NMR analysis of PMMA revealed a syndio-rich atactic microstructure in agreement with conventional radical process. Radical scavenger TEMPO effect together with microstructure and molecular weight distributions data supported that the polymerization proceed via free radical mechanism.
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<record><TEI><teiHeader><fileDesc><titleStmt><title xml:lang="en" level="a">Polymerization of Methyl Methacrylate with Nickel (II)a-Benzoinoxime Complex</title><author><name sortKey="Harrar Ferfera, Hafida" sort="Harrar Ferfera, Hafida" uniqKey="Harrar Ferfera H" first="Hafida" last="Harrar-Ferfera">Hafida Harrar-Ferfera</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene</s1><s2>Algiers 16111</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author><author><name sortKey="Amrani, Farouk" sort="Amrani, Farouk" uniqKey="Amrani F" first="Farouk" last="Amrani">Farouk Amrani</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene</s1><s2>Algiers 16111</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">INIST</idno><idno type="inist">09-0248595</idno><date when="2008">2008</date><idno type="stanalyst">PASCAL 09-0248595 INIST</idno><idno type="RBID">Pascal:09-0248595</idno><idno type="wicri:Area/PascalFrancis/Corpus">000194</idno><idno type="wicri:Area/PascalFrancis/Curation">000247</idno><idno type="wicri:Area/PascalFrancis/Checkpoint">000215</idno><idno type="wicri:explorRef" wicri:stream="PascalFrancis" wicri:step="Checkpoint">000215</idno><idno type="wicri:doubleKey">0021-8995:2008:Harrar Ferfera H:polymerization:of:methyl</idno><idno type="wicri:Area/Main/Merge">000597</idno><idno type="wicri:Area/Main/Curation">000581</idno><idno type="wicri:Area/Main/Exploration">000581</idno></publicationStmt><sourceDesc><biblStruct><analytic><title xml:lang="en" level="a">Polymerization of Methyl Methacrylate with Nickel (II)a-Benzoinoxime Complex</title><author><name sortKey="Harrar Ferfera, Hafida" sort="Harrar Ferfera, Hafida" uniqKey="Harrar Ferfera H" first="Hafida" last="Harrar-Ferfera">Hafida Harrar-Ferfera</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene</s1><s2>Algiers 16111</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author><author><name sortKey="Amrani, Farouk" sort="Amrani, Farouk" uniqKey="Amrani F" first="Farouk" last="Amrani">Farouk Amrani</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Faculty of Chemistry, University of Sciences and Technology, Houari Boumediene</s1><s2>Algiers 16111</s2><s3>DZA</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ></inist:fA14><country>Algérie</country><placeName><settlement type="city">Alger</settlement><region nuts="2">Wilaya d'Alger</region></placeName></affiliation></author></analytic><series><title level="j" type="main">Journal of applied polymer science</title><title level="j" type="abbreviated">J. appl. polym. sci.</title><idno type="ISSN">0021-8995</idno><imprint><date when="2008">2008</date></imprint></series></biblStruct></sourceDesc><seriesStmt><title level="j" type="main">Journal of applied polymer science</title><title level="j" type="abbreviated">J. appl. polym. sci.</title><idno type="ISSN">0021-8995</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Bulk polymerization</term><term>Catalyst activity</term><term>Complex catalyst</term><term>Complex catalyst polymerization</term><term>Experimental study</term><term>Free radical polymerization</term><term>Kinetics</term><term>Methyl methacrylate polymer</term><term>Nickel II Complexes</term><term>Rate constant</term><term>Reaction mechanism</term><term>Solution polymerization</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Méthacrylate de méthyle polymère</term><term>Polymérisation catalyseur complexe</term><term>Nickel II Complexe</term><term>Constante vitesse</term><term>Polymérisation solution</term><term>Mécanisme réaction</term><term>Cinétique</term><term>Polymérisation radicalaire</term><term>Polymérisation masse</term><term>Activité catalytique</term><term>Catalyseur complexe</term><term>Etude expérimentale</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Polymerizations of methyl methacrylate (MMA) monomer initiated by a novel Ni(II)a-benzoinoxime complex have been achieved under homogeneous conditions in the 25-60°C temperature range. The activity for polymerization increases with reaction temperature and by carrying out the polymerization in solution of low-polarity solvents without any induction time. The obtained polymers have weight-average molecular weights about 10<sup>5</sup> and slight broad polydispersity indexes (2.2 < M<sub>w</sub>/M<sub>n</sub> ≤ 3.3). Dependence of rate constants polymerization and decomposition of initiator (k<sub>app</sub> and k<sub>d</sub>, respectively) on temperature was investigated and activation parameters were computed from Arrhenius plot. <sup>1</sup>H-NMR analysis of PMMA revealed a syndio-rich atactic microstructure in agreement with conventional radical process. Radical scavenger TEMPO effect together with microstructure and molecular weight distributions data supported that the polymerization proceed via free radical mechanism.</div></front></TEI><affiliations><list><country><li>Algérie</li></country><region><li>Wilaya d'Alger</li></region><settlement><li>Alger</li></settlement></list><tree><country name="Algérie"><region name="Wilaya d'Alger"><name sortKey="Harrar Ferfera, Hafida" sort="Harrar Ferfera, Hafida" uniqKey="Harrar Ferfera H" first="Hafida" last="Harrar-Ferfera">Hafida Harrar-Ferfera</name></region><name sortKey="Amrani, Farouk" sort="Amrani, Farouk" uniqKey="Amrani F" first="Farouk" last="Amrani">Farouk Amrani</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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