All-cellulose composites from alfa and wood fibers

Research output: Contribution to journalArticleScientificpeer-review

Details

Original languageEnglish
Pages (from-to)135-141
Number of pages7
JournalIndustrial Crops and Products
Volume127
StatePublished - 1 Jan 2019
MoE publication typeA1 Journal article-refereed

Researchers

Research units

  • Tunis-El Manar University
  • CNRS
  • Technological Park of Borj Cedria

Abstract

All-cellulose composites (ACCs) in which both matrices and reinforcing fibers are made from lignocellulose were successfully obtained from alfa (Stipa tenacissima L) and wood (Genus Betula) fibers. Matrices were prepared either from alfa or wood pulps that were dissolved in 8 wt% NaOH-water, while reinforcing fibers were alfa in both matrices. Prior to the dissolution, alfa and wood pulps were acid hydrolyzed in order to decrease cellulose degree of polymerization to 149 and 145, respectively. The degree of cellulose dissolution was 95–96% for both alfa and wood dissolving pulps. X-ray diffraction (XRD) analysis confirmed the coexistence of cellulose I and II. The adhesion between the reinforcing fibers and both matrices was investigated using Scanning Electron Microscopy (SEM) and was found to be excellent. The density of ACCs decreased with the increase of the reinforcing fiber content for both types of matrices and ranged from 0.6 to 1.0 g.cm−3 leading to remarkably low-density ACCs. Young's modulus reached 3.8 and 4.2 GPa for the composites based on alfa and wood dissolving pulps, respectively, while yield stress reached 16 and 13.9 MPa, respectively.

    Research areas

  • Alfa fiber, All-cellulose composite, Density, Mechanical properties, Stipa Tenacissima, Wood fiber

ID: 29456478