Impact of stone ground 'V-fines' dispersion and compatibilization on polyethylene wood plastic composites

Kirsi Immonen (Corresponding Author), Erkki Saharinen, Ilkka Nurminen, Jari Sirviö, David Sandquist

Research output: Contribution to journalArticleScientificpeer-review

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Abstract

Recent studies have suggested that blocky mechanical pulp fines (CTMP fines) and fibrillar fines (SMC fines) have a negative impact on biocomposite modulus of rupture (MoR) in compression molded biocomposites. In addition, it was suggested that CTMP fines also have a negative impact on biocomposite modulus of elasticity (MoE). This study investigated whether these findings transfer to other types of cellulose fines material and injection molding. The effect of 'V-fines' addition to sawdust-and TMP-based biocomposites was analyzed, with respect to fines concentration, dispersing agent, and compatibilizers. The results indicated that the addition of 'V-fines' increased the stiffness (MoE) of all the analyzed compositions, while reducing the elongation at break. The addition of 'V-fines' reduced the tensile and flexural strength of TMP biocomposites, while it was largely unaffected for sawdust biocomposites. Flexural strength for neat 'V-fines' composites showed an increase that was proportional to the remaining pulp fibers composition. The addition of a dispersant agent to the 'V-fines' increased tensile strength, suggesting that an increased dispersion of the 'V-fines' can be achieved and is beneficial to the composite. The effects of the analyzed compatibilizer (polyethyleneoxide) was negligible, except for a small indication of increased MoE for fines / sawdust biocomposites.

Original languageEnglish
Pages (from-to)6561-6575
Number of pages15
JournalBioResources
Volume15
Issue number3
Publication statusPublished - Aug 2020
MoE publication typeA1 Journal article-refereed

Keywords

  • Composites
  • Fines material
  • Mechanical pulp manufacturing
  • Pulp fines
  • Short fiber composites
  • Wood polymer composites
  • WPC

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