Restricted accessResearch articleFirst published online 2026
Development and characterization of PLA/nanoclay biocomposites reinforced with Mimosa pudica microfibers for enhanced mechanical and thermal performance
The purpose of the present work is to investigate the physical, mechanical, and thermal properties of a novel Mimosa pudica (MP) microfiber-reinforced polylactic acid (PLA) green nanocomposite for biomedical and packaging applications. Calcium sulfate (CaSO4) has been chosen as a filler, which is a by-product of PLA production. In addition, different weight % (2, 3, and 4) of organically modified montmorillonite (o-MMT) nanoclay, as the reinforcing filler, have been mixed with PLA by twin-screw extrusion to obtain three polymer samples. The biocomposite variants were prepared by stacking a layer of 10 wt.% MP microfibers between two layers of nano PLA matrix mix in a compression molding machine. Characterization of the molded composites has been done through the investigation of density, water absorption, mechanical properties, morphology, and biodegradability tests, along with thermal analysis. Results indicate that the MP microfibers reinforced biocomposite containing 3 wt.% nanoclay exhibited the highest tensile strength, 22.98 MPa, whereas the biocomposite containing 4 wt.% nanoclay exhibited the highest impact strength of 162.52 J/m, flexural strength of 32 MPa, and hardness of 19.4 HV. PLA/MP composites with 4% nanoclay recorded the highest thermal resistance at 359°C for 80% weight loss. The addition of MMT nanoclay improved water resistance, mechanical properties, and thermal stability across the variants, with a marginal decrease in biodegradability.
MazzantiVParianteRBonannoA, et al. Reinforcing mechanisms of natural fibers in green composites: role of fibers morphology in a PLA/hemp model system. Compos Sci Technol2019; 180: 51–59.
BaghaeiBSkrifvarsMBerglinL.Characterization of thermoplastic natural fibre composites made from woven hybrid yarn prepregs with different weave pattern. Compos Part A: Appl Sci Manuf2015; 76: 154–161.
4.
MukherjeeTKaoN.PLA based biopolymer reinforced with natural fibre: a review. J Polym Environ2011; 19: 714–725.
5.
MoudoodARahmanAKhanlouHM, et al. Environmental effects on the durability and the mechanical performance of flax fiber/bio-epoxy composites. Compos B Eng2019; 171: 284–293.
6.
AmjadAAnjangAbRahmanAAbidinMSZ. Effect of nanofillers on mechanical and water absorption properties of alkaline treated jute fiber reinforced epoxy bio nanocomposites. J Nat Fibers2022; 19(16): 14592–14608.
7.
AmjadAAnjangAbRahmanAAwaisH, et al. A review investigating the influence of nanofiller addition on the mechanical, thermal and water absorption properties of cellulosic fibre reinforced polymer composite. J Ind Text2022; 51: 65S–100S.
8.
KanakannavarSPitchaimaniJRameshMR.Tribological behaviour of natural fibre 3D braided woven fabric reinforced PLA composites. Proc Inst Mech Eng J Eng Tribol2021; 235(7): 1353–1364.
9.
KaiserMRAnuarHBSamatNB, et al. Effect of processing routes on the mechanical, thermal and morphological properties of PLA-based hybrid biocomposite. Iran Polym J2013; 22: 123–131.
10.
MolinaroSCruz RomeroMBoaroM, et al. Effect of nanoclay-type and PLA optical purity on the characteristics of PLA-based nanocomposite films. J Food Eng2013; 117: 113–123.
11.
Umamaheswara RaoRVenkatanarayanaBSumanKNS. Enhancement of mechanical properties of PLA/PCL (80/20) blend by reinforcing with MMT nanoclay. Mater Today Proc2019; 18: 85–97.
12.
Oliver-OrtegaHVandemoorteleVBalaA, et al. Nanoclay effect into the biodegradation and processability of poly(lactic acid) nanocomposites for food packaging. Polymers2021; 13(16): 2741.
13.
D’AnnaAArrigoRFracheA.Rheology, morphology and thermal properties of a PLA/PHB/clay blend nanocomposite: the influence of process parameters. J Polym Environ2022; 30(1): 102–113.
14.
KovacevicZBischofSFanM.The influence of Spartium junceum L. fibres modified with montmorillonite nanoclay on the thermal properties of PLA biocomposites. Compos B Eng2015; 78: 122–130.
15.
MoyoMKannyKVelmuruganR.The efficacy of nanoclay loading in the medium velocity impact resistance of kenaf/PLA biocomposites. Appl Nanosci2021; 11: 441–453.
16.
RameshPPrasadBDNarayanaKL.Effect of MMT clay on mechanical, thermal and barrier properties of treated aloevera fiber/PLA-hybrid biocomposites. Silicon2020; 12: 1751–1760.
17.
KokaneDDMoreRYKaleMB, et al. Evaluation of wound healing activity of root of Mimosa pudica. J Ethnopharmacol2009; 124(2): 311–315.
18.
Thirukkalukundram SingarapriyavardhananSTimiri ShanmugamPSKoppala NarayanaSK, et al. Mimosa pudica alleviates streptozotocin-induced diabetes, glycemic stress and glutathione depletion in Wistar Albino rats. J King Saud Univ Sci2022; 34(4): 102037.
19.
SenguptaAPattnaikSSutarMK.Investigation of physico-mechanical properties of Mimosa pudica micro-fibrils as an effective reinforcement in polymer composite. Proc Inst Mech Eng C J Mech Eng Sci2025; 239: 2004–2013.
20.
SenguptaAPattnaikSSutarMK.Physio-mechanical and thermal characteristics of Mimosa pudica microfibers impregnated novel PLA biocomposite. Iran Polym J2025; 34: 499–515.
21.
MurariuMDuboisP.PLA composites: from production to properties. Adv Drug Deliv Rev2016; 107: 17–46.
22.
ShahrozeRMIshakMRSalitMS, et al. Effect of organo-modified nanoclay on the mechanical properties of sugar palm fiber-reinforced polyester composites. BioResources2018; 13(4): 7430–7444.
23.
RaichurSRavishankarR.Fabrication and mechanical analysis of nanoclay reinforced PLA composite developed by fused filament fabrication. J Inst Eng (India) Ser D2024; 105(1): 133–140.
24.
Nemati GivARastegarSÖzcanM. Influence of nanoclays on water uptake and flexural strength of glass-polyester composites. J Appl Biomater Funct Mater2020; 18: 2280800020930180.
25.
AbdelaAVandaeleMHaenenS, et al. Moisture absorption characteristics and subsequent mechanical property loss of Enset–pla composites. J Compos Sci2023; 7(9): 382.
26.
RameshPPrasadBDNarayanaKL.Effect of fiber hybridization and montmorillonite clay on properties of treated kenaf/aloe vera fiber reinforced PLA hybrid nanobiocomposite. Cellulose2020; 27(12): 6977–6993.
27.
EngCCIbrahimNAZainuddinN, et al. Enhancement of mechanical and dynamic mechanical properties of hydrophilic nanoclay reinforced polylactic acid/polycaprolactone/oil palm mesocarp fiber hybrid composites. International J Poly Sci2014; 2014(1): 715801–715808.
28.
RameshPPrasadBDNarayanaKL.Influence of montmorillonite clay content on thermal, mechanical, water absorption and biodegradability properties of treated kenaf fiber/ PLA-hybrid biocomposites. Silicon2021; 13(1): 109–118.
29.
GolmakaniMEWiczenbachTMalikanM, et al. Experimental and numerical investigation of tensile and flexural behavior of nanoclay wood-plastic composite. Materials2021; 14(11): 2773.
30.
MoyoMKannyKMohanTP.Thermo-mechanical response of kenaf/PLA biocomposites to clay nanoparticles infusion. Mater Today Proc2021; 38: 609–613.
31.
YussufAAMassoumiIHassanA.Comparison of polylactic acid/kenaf and polylactic acid/rise husk composites: the influence of the natural fibers on the mechanical, thermal and biodegradability properties. J Polym Environ2010; 18: 422–429.
32.
BayerlTGeithMSomashekarAA, et al. Influence of fibre architecture on the biodegradability of FLAX/PLA composites. Int Biodeterior Biodegradation2014; 96: 18–25.
