Effect of polydopamine coating of cellulose nanocrystals on performance of PCL/PLA bio-nanocomposites

0569363 - ÚMCH 2024 RIV CH eng J - Journal Article
Kelnar, Ivan - Kaprálková, Ludmila - Krejčíková, Sabina - Dybal, Jiří - Vyroubalová, Michaela - Abdel-Mohsen, Abdellatif M.
Effect of polydopamine coating of cellulose nanocrystals on performance of PCL/PLA bio-nanocomposites.
Materials. Roč. 16, č. 3 (2023), č. článku 1087. E-ISSN 1996-1944
Grant - others:AV ČR(CZ) ASRT-19-06 3326
Program: Bilaterální spolupráce
Institutional support: RVO:61389013
Keywords : poly(lactic acid) * poly(ε-caprolactone) * cellulose nanocrystals
OECD category: Polymer science
Impact factor: 3.4, year: 2022
Method of publishing: Open access
https://www.mdpi.com/1996-1944/16/3/1087

In bio-nanocomposites with a poly(lactic acid) (PLA)/poly(ε-caprolactone) (PCL) matrix with neat and polydopamine (PDA)-coated cellulose nanocrystals (CNCd), the use of different mixing protocols with masterbatches prepared by solution casting led to marked variation of localization, as well as reinforcing and structure-directing effects, of cellulose nanocrystals (CNC). The most balanced mechanical properties were found with an 80/20 PLA/PCL ratio, and complex PCL/CNC structures were formed. In the nanocomposites with a bicontinuous structure (60/40 and 40/60 PLA/PCL ratios), pre-blending the CNC and CNCd/PLA caused a marked increase in the continuity of mechanically stronger PLA and an improvement in related parameters of the system. On the other hand, improved continuity of the PCL phase when using a PCL masterbatch may lead to the reduction in or elimination of reinforcing effects. The PDA coating of CNC significantly changed its behavior. In particular, a higher affinity to PCL and ordering of PLA led to dissimilar structures and interface transformations, while also having antagonistic effects on mechanical properties. The negligible differences in bulk crystallinity indicate that alteration of mechanical properties may have originated from differences in crystallinity at the interface, also influenced by presence of CNC in this area. The complex effect of CNC on bio-nanocomposites, including the potential of PDA coating to increase thermal stability, is worthy of further study.

Permanent Link: https://hdl.handle.net/11104/0340712