Acetal‐induced strength increases and lower resin content of MUF and other polycondensation adhesives
Identifieur interne : 008850 ( Main/Exploration ); précédent : 008849; suivant : 008851Acetal‐induced strength increases and lower resin content of MUF and other polycondensation adhesives
Auteurs : A. Pizzi [France] ; M. Beaujean [Belgique] ; C. Zhao [France] ; M. Properzi [France] ; Z. Huang [France]Source :
- Journal of Applied Polymer Science [ 0021-8995 ] ; 2002-06-24.
English descriptors
- Teeft :
- Acetal, Additive, Adhesive, Adhesive resins, Appl polym, Available additive, Butylal, Chemical shifts, Considerable decrease, Constant heating rate, Cost structure, Effective additives, Effective functionality, Environmental protection agency, Ethylal, Ethylal addition, Force cycle, Formaldehyde, Formalin solution, Heterogeneous phase, Homogeneous phase, Internal bond, Laboratory particleboard, Lesser effect, Marcel dekker, Mass ratio, Maximum value, Melamine, Melamine content, Melamine resins, Methylal, Methylal addition, Modulus, Molar, Molar ratio, Molar ratio nh4cl, Other resins, Particleboard, Pizzi, Polycondensation resins, Polym, Polym chem, Propylal, Relative proportion, Resin, Resin loading, Resin methylal, Resin solids, Resin solids content, Same conditions, Same performance, Same resin, Side bands, Simple model compounds, Small addition, Solubility, Strength improvement, Strength increases, Thermomechanical analysis, Toxicity limits, Transacetalization reactions, Urea, Urea resins, Water solution, Wiley periodicals, Wood boards, Wood industry, Wood joints, Wood panel, Wood panels, Wood particleboard.
Abstract
Acetals such as methylal and ethylal are shown to be particularly effective additives in improving the strength of wood boards bonded with melamine‐ urea‐formaldehyde (MUF) resins, although they show some appreciable but lesser effect on other resins too, particularly phenol‐ formaldehyde resins. They equally allow a considerable decrease in resin loading, and thus, in melamine content, on the bonded wood panel and at parity of performance. Their development as additives is then primarily, but not only, targeted at the MUF adhesive resins. One‐third decreases in MUF adhesives loading at parity of performance or equally internal bond (IB) strength increases approximately up to 50% by addition of methylal are shown to be possible by laboratory particleboard as well as by thermomechanical analysis (TMA). The reasons for methylal and ethylal behavior were studied by a variety of techniques, including liquid‐ and solid‐ phase 13C‐NMR and could be mostly ascribed to the increased effectiveness and participation of the melamine to resin crosslinking due to its now preferentially homogeneous rather than heterogeneous reactions, consequences of the increased solubility in water afforded by the acetal cosolvents. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2561–2571, 2002
Url:
DOI: 10.1002/app.10213
Affiliations:
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Beaujean</name><affiliation wicri:level="3"><country xml:lang="fr">Belgique</country><wicri:regionArea>Lambiotte & Cie NV, Brussels</wicri:regionArea><placeName><settlement type="city">Bruxelles</settlement><region nuts="2">Région de Bruxelles-Capitale</region></placeName></affiliation></author><author><name sortKey="Zhao, C" sort="Zhao, C" uniqKey="Zhao C" first="C." last="Zhao">C. Zhao</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>ENSTIB, University of Nancy 1, Epinal</wicri:regionArea><placeName><region type="region">Grand Est</region><region type="old region">Lorraine (région)</region><settlement type="city">Épinal</settlement></placeName></affiliation></author><author><name sortKey="Properzi, M" sort="Properzi, M" uniqKey="Properzi M" first="M." last="Properzi">M. Properzi</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>ENSTIB, University of Nancy 1, Epinal</wicri:regionArea><placeName><region type="region">Grand Est</region><region type="old region">Lorraine (région)</region><settlement type="city">Épinal</settlement></placeName></affiliation></author><author><name sortKey="Huang, Z" sort="Huang, Z" uniqKey="Huang Z" first="Z." last="Huang">Z. Huang</name><affiliation wicri:level="3"><country xml:lang="fr">France</country><wicri:regionArea>ENSTIB, University of Nancy 1, Epinal</wicri:regionArea><placeName><region type="region">Grand Est</region><region type="old region">Lorraine (région)</region><settlement type="city">Épinal</settlement></placeName></affiliation></author></analytic><monogr></monogr><series><title level="j" type="main">Journal of Applied Polymer Science</title><title level="j" type="alt">JOURNAL OF APPLIED POLYMER SCIENCE</title><idno type="ISSN">0021-8995</idno><idno type="eISSN">1097-4628</idno><imprint><biblScope unit="vol">84</biblScope><biblScope unit="issue">13</biblScope><biblScope unit="page" from="2561">2561</biblScope><biblScope unit="page" to="2571">2571</biblScope><biblScope unit="page-count">11</biblScope><publisher>Wiley Subscription Services, Inc., A Wiley Company</publisher><pubPlace>New York</pubPlace><date type="published" when="2002-06-24">2002-06-24</date></imprint><idno type="ISSN">0021-8995</idno></series></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">0021-8995</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="Teeft" xml:lang="en"><term>Acetal</term><term>Additive</term><term>Adhesive</term><term>Adhesive resins</term><term>Appl polym</term><term>Available additive</term><term>Butylal</term><term>Chemical shifts</term><term>Considerable decrease</term><term>Constant heating rate</term><term>Cost structure</term><term>Effective additives</term><term>Effective functionality</term><term>Environmental protection agency</term><term>Ethylal</term><term>Ethylal addition</term><term>Force cycle</term><term>Formaldehyde</term><term>Formalin solution</term><term>Heterogeneous phase</term><term>Homogeneous phase</term><term>Internal bond</term><term>Laboratory particleboard</term><term>Lesser effect</term><term>Marcel dekker</term><term>Mass ratio</term><term>Maximum value</term><term>Melamine</term><term>Melamine content</term><term>Melamine resins</term><term>Methylal</term><term>Methylal addition</term><term>Modulus</term><term>Molar</term><term>Molar ratio</term><term>Molar ratio nh4cl</term><term>Other resins</term><term>Particleboard</term><term>Pizzi</term><term>Polycondensation resins</term><term>Polym</term><term>Polym chem</term><term>Propylal</term><term>Relative proportion</term><term>Resin</term><term>Resin loading</term><term>Resin methylal</term><term>Resin solids</term><term>Resin solids content</term><term>Same conditions</term><term>Same performance</term><term>Same resin</term><term>Side bands</term><term>Simple model compounds</term><term>Small addition</term><term>Solubility</term><term>Strength improvement</term><term>Strength increases</term><term>Thermomechanical analysis</term><term>Toxicity limits</term><term>Transacetalization reactions</term><term>Urea</term><term>Urea resins</term><term>Water solution</term><term>Wiley periodicals</term><term>Wood boards</term><term>Wood industry</term><term>Wood joints</term><term>Wood panel</term><term>Wood panels</term><term>Wood particleboard</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Acetals such as methylal and ethylal are shown to be particularly effective additives in improving the strength of wood boards bonded with melamine‐ urea‐formaldehyde (MUF) resins, although they show some appreciable but lesser effect on other resins too, particularly phenol‐ formaldehyde resins. They equally allow a considerable decrease in resin loading, and thus, in melamine content, on the bonded wood panel and at parity of performance. Their development as additives is then primarily, but not only, targeted at the MUF adhesive resins. One‐third decreases in MUF adhesives loading at parity of performance or equally internal bond (IB) strength increases approximately up to 50% by addition of methylal are shown to be possible by laboratory particleboard as well as by thermomechanical analysis (TMA). The reasons for methylal and ethylal behavior were studied by a variety of techniques, including liquid‐ and solid‐ phase 13C‐NMR and could be mostly ascribed to the increased effectiveness and participation of the melamine to resin crosslinking due to its now preferentially homogeneous rather than heterogeneous reactions, consequences of the increased solubility in water afforded by the acetal cosolvents. © 2002 Wiley Periodicals, Inc. J Appl Polym Sci 84: 2561–2571, 2002</div></front></TEI><affiliations><list><country><li>Belgique</li><li>France</li></country><region><li>Grand Est</li><li>Lorraine (région)</li><li>Région de Bruxelles-Capitale</li></region><settlement><li>Bruxelles</li><li>Épinal</li></settlement></list><tree><country name="France"><region name="Grand Est"><name sortKey="Pizzi, A" sort="Pizzi, A" uniqKey="Pizzi A" first="A." last="Pizzi">A. Pizzi</name></region><name sortKey="Huang, Z" sort="Huang, Z" uniqKey="Huang Z" first="Z." last="Huang">Z. Huang</name><name sortKey="Pizzi, A" sort="Pizzi, A" uniqKey="Pizzi A" first="A." last="Pizzi">A. Pizzi</name><name sortKey="Properzi, M" sort="Properzi, M" uniqKey="Properzi M" first="M." last="Properzi">M. Properzi</name><name sortKey="Zhao, C" sort="Zhao, C" uniqKey="Zhao C" first="C." last="Zhao">C. Zhao</name></country><country name="Belgique"><region name="Région de Bruxelles-Capitale"><name sortKey="Beaujean, M" sort="Beaujean, M" uniqKey="Beaujean M" first="M." last="Beaujean">M. Beaujean</name></region></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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