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Kraft lignin as fiber treatment for natural fiber‐reinforced composites

Identifieur interne : 000747 ( Istex/Corpus ); précédent : 000746; suivant : 000748

Kraft lignin as fiber treatment for natural fiber‐reinforced composites

Auteurs : Wim Thielemans ; Richard P. Wool

Source :

RBID : ISTEX:C025BCD5FD9533D3B495AD88CD9BA85D9AC1D063

Abstract

Pine kraft lignin was sedimented from an aqueous NaOH solution (pH 13) onto flax fibers by submerging flax fiber mats in the alkaline solution for 5 min. This treatment has been used to improve the interfacial interactions between the hydrophilic flax and a hydrophobic soy‐oil‐based liquid molding resin. The flax fiber mat weight increase as a function of the lignin content in the alkaline treatment solution was determined and visualized using electron microscopy. Lignin sedimentation was found to decrease the contact angle between the resin and the treated flax fibers. Tensile and flexural properties of the composite samples showed an increase in mechanical properties with increasing lignin sedimentation, with a positive deviation for low lignin sedimentation. These results are in line with previous published data with hemp fiber composites [Thielemans et al. (2002), J. Appl. Polym. Sci., 83, 323]. Improved properties are attributed to the improved wettability, while the low lignin content deviation is due to small lignin deposits protruding from the surface and thus improving mechanical interlocking. Features on the fracture surfaces, visualized by electron microscopy, are consistent with these findings. The soy‐oil‐based resin behaves similar to existing petroleum‐based unsaturated polyester and vinylester resins and its use is not inherent to the success of the lignin treatment. POLYM. COMPOS., 26:695–705, 2005. © 2005 Society of Plastics Engineers

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DOI: 10.1002/pc.20141

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<abstract lang="fr">Pine kraft lignin was sedimented from an aqueous NaOH solution (pH 13) onto flax fibers by submerging flax fiber mats in the alkaline solution for 5 min. This treatment has been used to improve the interfacial interactions between the hydrophilic flax and a hydrophobic soy‐oil‐based liquid molding resin. The flax fiber mat weight increase as a function of the lignin content in the alkaline treatment solution was determined and visualized using electron microscopy. Lignin sedimentation was found to decrease the contact angle between the resin and the treated flax fibers. Tensile and flexural properties of the composite samples showed an increase in mechanical properties with increasing lignin sedimentation, with a positive deviation for low lignin sedimentation. These results are in line with previous published data with hemp fiber composites [Thielemans et al. (2002), J. Appl. Polym. Sci., 83, 323]. Improved properties are attributed to the improved wettability, while the low lignin content deviation is due to small lignin deposits protruding from the surface and thus improving mechanical interlocking. Features on the fracture surfaces, visualized by electron microscopy, are consistent with these findings. The soy‐oil‐based resin behaves similar to existing petroleum‐based unsaturated polyester and vinylester resins and its use is not inherent to the success of the lignin treatment. POLYM. COMPOS., 26:695–705, 2005. © 2005 Society of Plastics Engineers</abstract>
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<note type="funding">Environmental Protection Agency</note>
<note type="funding">DoE</note>
<relatedItem type="host">
<titleInfo>
<title>Polymer Composites</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>Polym Compos</title>
</titleInfo>
<genre type="journal">journal</genre>
<subject>
<genre>article-category</genre>
<topic>Article</topic>
</subject>
<identifier type="ISSN">0272-8397</identifier>
<identifier type="eISSN">1548-0569</identifier>
<identifier type="DOI">10.1002/(ISSN)1548-0569</identifier>
<identifier type="PublisherID">PC</identifier>
<part>
<date>2005</date>
<detail type="volume">
<caption>vol.</caption>
<number>26</number>
</detail>
<detail type="issue">
<caption>no.</caption>
<number>5</number>
</detail>
<extent unit="pages">
<start>695</start>
<end>705</end>
<total>11</total>
</extent>
</part>
</relatedItem>
<identifier type="istex">C025BCD5FD9533D3B495AD88CD9BA85D9AC1D063</identifier>
<identifier type="DOI">10.1002/pc.20141</identifier>
<identifier type="ArticleID">PC20141</identifier>
<accessCondition type="use and reproduction" contentType="copyright">Copyright © 2005 Society of Plastics Engineers</accessCondition>
<recordInfo>
<recordContentSource>WILEY</recordContentSource>
<recordOrigin>Wiley Subscription Services, Inc., A Wiley Company</recordOrigin>
</recordInfo>
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