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On the determination of charge and nitrogen content in cellulose fibres modified to contain quaternary amine functionality

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اقرأ أكثر حفظ في قائمتي
  • معلومة اضافية
    • Publisher Information:
      KTH, Fiberteknologi Department of Chemistry and Chemical Engineering, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden; FibRe Center for Lignocellulose-based Thermoplastics, Chalmers University of Technology, SE-412 96 Gothenburg, Sweden Elsevier BV 2025
    • نبذة مختصرة :
      Research interest in quaternization of cellulose fibres has increased considerably over the past decades. However, there is little or no consensus regarding how to characterize the material in terms of degree of substitution (DS), and the literature suggests a range of different methods focusing on charge determination as well as nitrogen content quantification. This work aims to fill the knowledge gap regarding how the different methods perform in relation to each other, and for what cellulosic systems each method has advantages, disadvantages and even potential pitfalls. FT-IR and NMR measurements are used to establish successful modification and determine the relative number of substituent groups. Another six methods are compared for the determination of the DS of cellulosic fibres and nanofibrils. The methods include Kjeldahl measurements, nitrogen determination by chemiluminescence, determination of molecular nitrogen by the Dumas method, colloidal titration, conductometric titration and polyelectrolyte adsorption. It can be concluded that most techniques investigated are reliable within certain ranges of DS and/or when using appropriate post-treatment of the quaternized material and suitable sample preparation techniques. The results from the present work hence provide recommendations to make an educated choice of method, and experimental protocol, based on the technique at hand.
      QC 20240926
    • الموضوع:
      Cellulose Fibres; Charge determination; Degree of substitution; Nitrogen quantification; Quaternization; Polymer Chemistry; Polymerkemi; Article in journal; info:eu-repo/semantics/article; text
    • الرقم المعرف:
      10.1016.j.carbpol.2024.122734
    • Availability:
      Open access content. Open access content
      info:eu-repo/semantics/restrictedAccess
    • Note:
      English
    • Other Numbers:
      UPE oai:DiVA.org:kth-353929
      0000-0001-8622-0386
      0000-0002-7410-0333
      doi:10.1016/j.carbpol.2024.122734
      Scopus 2-s2.0-85203849829
      1457580033
    • Contributing Source:
      UPPSALA UNIV LIBR
      From OAIster®, provided by the OCLC Cooperative.
    • الرقم المعرف:
      edsoai.on1457580033
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