Crosslinked polyvinyl acetate reinforced with cellulose nanocrystals –: Characterization of structure and mechanical properties
2015 (English)Conference paper, Poster (Refereed)
The structure of cellulose based nanocomposites influences their final mechanical properties significantly. Obtaining good dispersion of hydrophilic nanocellulose materials in hydrophobic polymer matrix is challenging. Here two unique methods were developed to improve the dispersion of cellulose nanocrystals (CNC) in polyvinyl acetate (PVAc) matrix. One is in-situ polymerization of vinyl acetate in the presence of CNCs, and the other one is crosslinking of PVAc by sodium tetraborate (Borax), which restricts the movement of CNCs during the drying process. The results from atomic force microscopy (AFM) show that the in-situ CNC/PVAc emulsion has much better dispersion than the one produced by stirring. Moreover, the mechanical characterization indicates that the in-situ composite with 10 wt% CNC has higher strength compared to the stirred composite with the same CNC concentration. The mechanical properties of crosslinked PVAc materials can be varied by changing the pH and may be attributed to differences of the crosslinking degree. Further investigations of the restriction effect caused by borax are needed.
Place, publisher, year, edition, pages
Research subject Wood and Bionanocomposites
IdentifiersURN: urn:nbn:se:ltu:diva-32506Local ID: 70661600-78ec-4c8c-82b8-1ff2aa4c280eOAI: oai:DiVA.org:ltu-32506DiVA: diva2:1005740
EEIGM International Conference on Advanced Materials Research : 11/06/2015 - 12/06/2015
Godkänd; 2015; 20160331 (shigen)2016-09-302016-09-30Bibliographically approved