Bio-based nanocomposites of polymyrcene/celluloce nanocrystals obtained by “in situ” polymerization
Bio-based nanocomposites of polymyrcene/celluloce nanocrystals obtained by “in situ” polymerization
DOI:
https://doi.org/10.54167/tch.v17i4.1337Keywords:
cellulose nanocrystals, bio-based elastomers, nanocomposites, β-myrcene, plasma-induced polymerization., plasma-induced polymerizationAbstract
The preparation of 100 % bio-based elastomeric nanocomposites is reported from the polymerization of β-myrcene using cellulose nanocrystals as filler, through an "in situ" process, that is, carrying out the polymerization in the presence of the nanofillers. Polymerization was via coordination in solution using a neodymium-based catalyst system, NdV3/DIBAH/Me2SiCl2 in a 1/20/1 molar ratio and evaluating different concentrations of cellulose nanocrystals at 0.5, 1.5, 3 and 5 % by weight, which were tested with and without surface modification by plasma using β-myrcene as modifier. Such modification was demonstrated by characterizing the materials by FTIR, XRD and TGA. The elastomeric nanocomposites obtained were characterized by GPC to obtain the molecular weights, as well as by NMR to determine the content of structures 1,4 (cis + trans) vs 3,4. As the percentage of cellulose nanocrystals in the formulations increased, polymeric matrices with higher molecular weights and broader distributions were produced, but the high cis-1,4 microstructure content was not affected. The glass transition temperature was also not significantly modified by the nanofillers, but an increase in the G' and G'' modules was observed due to their presence.
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