Scholarlink

<p>The development of nanocomposites made of polylactic acid (PLA) and cellulose nanofibrils by conventional melt mixing methods often requires strategies to incorporate the nanocellulose in a way that aggregation is minimized, and that the filler characteristics inherent to its nanoscale are preserved. In the current work, nanocomposite films of PLA and different contents of bacterial nanocellulose (BNC) were obtained by cast extrusion. Aiming to limit nanofibril aggregation, three strategies of filler incorporation into the extruder were assayed: (i) direct addition of dried and milled BNC, (ii) use of PLA/BNC masterbatches prepared by solvent casting, and (iii) use of masterbatches of PLA and surface-acetylated BNC (AcBNC) prepared in the same way. Composite films were characterized in terms of morphology, optical, thermal, tensile and barrier properties. Results showed that masterbatch preparation notably enhanced nanocellulose dispersion within the PLA matrix, improving the optical, thermal, and barrier properties of the composites, although no significant gains in mechanical performance were observed. Overall, the masterbatch approach effectively minimized nanocellulose aggregation, serving as an attractive strategy to enhance filler dispersion in PLA-based composites processed by conventional thermoplastic processing techniques.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Masterbatch-Assisted Dispersion of Bacterial Nanocellulose in Polylactic Acid Composites Prepared by Cast Extrusion

  • 期刊论文

  • 发表日期：

    2026年1月17日

查看全文
  • Jimena Bovi,
  • Franco Dominici,
  • Debora Puglia,
  • Celina Raquel Bernal,
  • María Laura Foresti

摘要

The development of nanocomposites made of polylactic acid (PLA) and cellulose nanofibrils by conventional melt mixing methods often requires strategies to incorporate the nanocellulose in a way that aggregation is minimized, and that the filler characteristics inherent to its nanoscale are preserved. In the current work, nanocomposite films of PLA and different contents of bacterial nanocellulose (BNC) were obtained by cast extrusion. Aiming to limit nanofibril aggregation, three strategies of filler incorporation into the extruder were assayed: (i) direct addition of dried and milled BNC, (ii) use of PLA/BNC masterbatches prepared by solvent casting, and (iii) use of masterbatches of PLA and surface-acetylated BNC (AcBNC) prepared in the same way. Composite films were characterized in terms of morphology, optical, thermal, tensile and barrier properties. Results showed that masterbatch preparation notably enhanced nanocellulose dispersion within the PLA matrix, improving the optical, thermal, and barrier properties of the composites, although no significant gains in mechanical performance were observed. Overall, the masterbatch approach effectively minimized nanocellulose aggregation, serving as an attractive strategy to enhance filler dispersion in PLA-based composites processed by conventional thermoplastic processing techniques.