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Polyurethane Adhesives Based on Oxyalkylated Kraft Lignin.

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  • معلومة اضافية
    • المصدر:
      Publisher: MDPI Country of Publication: Switzerland NLM ID: 101545357 Publication Model: Electronic Cited Medium: Internet ISSN: 2073-4360 (Electronic) Linking ISSN: 20734360 NLM ISO Abbreviation: Polymers (Basel) Subsets: PubMed not MEDLINE
    • بيانات النشر:
      Original Publication: Basel : MDPI
    • نبذة مختصرة :
      Lignin-based polyol was obtained via oxyalkylation reaction with propylene carbonate using eucalyptus kraft lignin isolated from the industrial cooking liquor by the Lignoboost ® procedure. This lignin-based polyol (LBP) was used without purification in the preparation of polyurethane (PU) adhesives combined with polymeric 4,4'-methylenediphenyl diisocyanate (pMDI). A series of adhesives were obtained by varying the NCO/OH ratio of PU counterparts (pMDI and LBPs) and their performance was evaluated by gluing wood pieces under predefined conditions. The adhesion properties of the novel PU adhesive were compared with those of a commercial PU adhesive (CPA). The occurrence and extent of curing reactions and changes in the polymeric network of PA were monitored by Fourier transform infrared spectroscopy (FTIR) and dynamic mechanical analysis. Although the lap shear strength and glass transition temperature of the lignin-based PU adhesives have increased steadily with the NCO/OH ratio ranging from 1.1-2.2, chemical aging resistance can be compromised when the NCO/OH is very low. It was found that the lignin-based PU adhesive with an NCO/OH ratio of 1.3 showed better chemical resistance and adhesion efficiency than CPA possibly because the NCO/OH in the latter is too high as revealed by FTIR spectroscopy. Despite some lower thermal stability and shorter gelation time of lignin-based PU than CPA, the former revealed great potential to reduce the use of petroleum-derived polyols and isocyanates with potential application in the furniture industry as wood bonding adhesive.
    • References:
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      Materials (Basel). 2021 Nov 21;14(22):. (PMID: 34832473)
      J Agric Food Chem. 2011 Oct 12;59(19):10505-16. (PMID: 21854019)
      Ann Work Expo Health. 2017 Aug 01;61(7):872-882. (PMID: 28810682)
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    • Grant Information:
      21874 European Union; UIDB/50011/2020, UIDP/50011/2020 & LA/P/0006/2020 Fundação para a Ciência e Tecnologia
    • Contributed Indexing:
      Keywords: adhesion; lignin-based polyol; oxyalkylation; polyurethane; propylene carbonate; wood adhesive
    • الموضوع:
      Date Created: 20221211 Latest Revision: 20221220
    • الموضوع:
      20240105
    • الرقم المعرف:
      PMC9740935
    • الرقم المعرف:
      10.3390/polym14235305
    • الرقم المعرف:
      36501699