Effect of processing conditions and lignin content on thermal, mechanical and degradative behavior of lignin nanoparticles/polylactic (acid) bionanocomposites prepared by melt extrusion and solvent casting

2015 ◽  
Vol 71 ◽  
pp. 126-139 ◽  
Author(s):  
W. Yang ◽  
E. Fortunati ◽  
F. Dominici ◽  
J.M. Kenny ◽  
D. Puglia
Keyword(s):  
Polylactic Acid ◽  
Lignin Content ◽  
Solvent Casting ◽  
Processing Conditions ◽  
Melt Extrusion

scholarly journals Antimicrobial Active Bioplastics Using Triangular Silver Nanoplate Integrated Polycaprolactone and Polylactic Acid Films

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1132
Author(s):  
Eduardo Lanzagorta Garcia ◽  
Olivia A. Attallah ◽  
Marija Mojicevic ◽  
Declan M Devine ◽  
Margaret Brennan Fournet
Keyword(s):  
Polylactic Acid ◽  
Scale Up ◽  
Composite Films ◽  
Antimicrobial Properties ◽  
Morphological Structure ◽  
Antimicrobial Effect ◽  
Solvent Casting ◽  
Local Surface Plasmon Resonance ◽  
Casting Technique ◽  
Triangular Silver Nanoplates

An innovative antimicrobial technology for plastic surfaces is presented. We report the synthesis and scale-up of triangular silver nanoplates (TSNPs) and their integration into polycaprolactone (PCL) and polylactic acid (PLA) polymers through a solvent-casting technique. The TSNPs have a high geometric aspect ratio and strong local surface plasmon resonance (LSPR) response, which provides an effective tool for monitoring their integrity during processing and integration with the biodegradable plastics. An aqueous-based seed-mediated chemical method was used to synthesize the TSNPs, and characterisation was carried out using TEM and UV (Ultraviolet)-VIS (Visible) spectroscopy to measure LSPR profiles. The UV-VIS spectra of silver seeds and TSNPs exhibited characteristic peaks at 395 and 600 nm respectively. Synthesized TSNPs were coated with thiol-terminated polyethylene glycol (SH-PEG) and transferred into chloroform in order to effect compatibility with PCL and PLA. TSNP/PCL and TSNP/PLA composite films were prepared by solvent casting. The morphological structure, thermal, mechanical, and antimicrobial properties of the TSNP-incorporated composite films were evaluated. Results showed the TSNP-treated films had a rougher surface than the bare films. Insignificant changes in the thermal properties of TSNP-treated films compared to bare ones were also observed, which indicated the thermal stability of the composite films. The tensile strength and antimicrobial properties of the composite films were increased after TSNP incorporation. TSNP/PCL and TSNP/PLA films exhibited improved antimicrobial activity against Escherichia coli and Staphylococcus aureus with antimicrobial effect (AE) values ranging between 0.10 and 0.35. The obtained results and demonstrated TSNP production scalability validate the TSNP treated PCL and PLA films as a composite material with desirable antimicrobial effect for wide-ranging surface applications.

scholarly journals Structures, Optical and Mechanical Properties of PLA/ZnO SiO2 Al2O3 Composite Elaborated by a Solvent Casting Method

Proceedings ◽  
2019 ◽  
Vol 26 (1) ◽  
pp. 18
Author(s):  
Bouamer ◽  
Benrekaa ◽  
Younes
Keyword(s):  
Mechanical Properties ◽  
Polylactic Acid ◽  
Solvent Casting ◽  
Casting Method ◽  
Al2o3 Composite ◽  
Optical And Mechanical Properties

In this study, granulated polylactic acid and ZnO, SiO2 and Al2O3 powders were mixed to form PLA/ZnO and PLA/ZnO SiO2 Al2O3 composites with different concentrations using a solvent casting method. [...]

scholarly journals Polylactic acid/kenaf cellulose biocomposite filaments for melt extrusion based-3D printing

2021 ◽  
Author(s):  
Chuanchom Aumnate ◽  
Niphaphun Soatthiyanon ◽  
Thidarat Makmoon ◽  
Pranut Potiyaraj
Keyword(s):  
Tensile Strength ◽  
Polyethylene Glycol ◽  
Polylactic Acid ◽  
Cellulose Fiber ◽  
Cellulose Fibers ◽  
Extrusion Process ◽  
Tetraethyl Orthosilicate ◽  
Melt Extrusion ◽  
Combined Use ◽  
Locally Grown

Abstract This study fabricated polylactic acid (PLA)/kenaf cellulose fiber biocomposite filaments via melt-extrusion process. Kenaf cellulose fibers (KF) were chemically extracted from locally grown kenaf plants and used as reinforcement. Moreover, the KF was then treated with tetraethyl orthosilicate (TEOS), so-called KFs, to improve the compatibility between the fibers and PLA matrix. Also, the plasticizers (polyethylene glycol) were incorporated to enhance the flowability and processability of the biocomposites. The melt viscosities of the biocomposites increased as the solid KF and KFs were loaded. However, they were significantly decreased with the addition of plasticizers. The combined use of the plasticizers and TEOS treatment improved tensile strength, Young’s modulus and elongation of the biocomposites compared to the neat PLA. The obtained PLA/KFs biocomposite materials are proved to be a mechanical-improved material, which offers the opportunity for customized and rapid prototyping of biocomposite products.

scholarly journals Effect of GNPs on the Piezoresistive, Electrical and Mechanical Properties of PHA and PLA Films

Fibers ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 86
Author(s):  
Gonzalo Mármol ◽  
Usha Kiran Sanivada ◽  
Raul Fangueiro
Keyword(s):  
Mechanical Properties ◽  
Electrical Conductivity ◽  
Polyethylene Glycol ◽  
Polylactic Acid ◽  
Cellulose Nanocrystals ◽  
Graphene Nanoplatelets ◽  
Gauge Factor ◽  
Solvent Casting ◽  
Nanoparticle Distribution ◽  
Primary Focus

Sustainability has become the primary focus for researchers lately. Biopolymers such as polyhydroxyalkanoate (PHA) and polylactic acid (PLA) are biocompatible and biodegradable. Introducing piezoresistive response in the films produced by PLA and PHA by adding nanoparticles can be interesting. Hence, a study was performed to evaluate the mechanical, electrical and piezoresistive response of films made from PHA and PLA. The films were produced by solvent casting, and they were reinforced with graphene nanoplatelets (GNPs) at different nanoparticle concentrations (from 0.15 to 15 wt.%). Moreover, cellulose nanocrystals (CNC) as reinforcing elements and polyethylene glycol (PEG) as plasticizers were added. After the assessment of the nanoparticle distribution, the films were subjected to tests such as tensile, electrical conductivity and piezoresistive response. The dispersion was found to be good in PLA films and there exist some agglomerations in PHA films. The results suggested that the incorporation of GNPs enhanced the mechanical properties until 0.75 wt.% and they reduced thereon. The addition of 1% CNCs and 20% PEG in 15 wt.% GNPs’ tensile values deteriorated further. The PHA films showed better electrical conductivity compared to the PLA films for the same GNPs wt.%. Gauge factor (GF) values of 6.30 and 4.31 were obtained for PHA and PLA, respectively.

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