Polylactide (PLA) is an eco-friendly biodegradable thermoplastic with excellent processability, demanding less energy to be produced compared to the petroleum-based polymers. However, PLA has drawbacks that impose some restrictions of uses use such as poor toughness property. Blending PLA with other polymers is a more practical and economic way to improve its toughness. The present study assessed the effect of the addition of the pre-crosslinked powdered nitrile rubber (NBR) containing calcium carbonate (CaCO3) and extruder screw rotation on the mechanical, rheological, morphological and thermal properties of polylactide (PLA) by using a Central Composite Rotatable Design (CCRD) analysis, which provides statistical support for the experimental data. The results showed that NBR/CaCO3 can be used as toughness modifier for PLA. This property improved due to the increase in energy expended to deform the material and generate cracks, as showed in the impact and morphological analyzes. Despite this improvement, the presence of CaCO3 caused a slight decline in the thermal resistance of the composites. The influence of rubber (NBR/CaCO3) content in PLA matrix on rheological properties, such as elongation viscosity, melt strength and drawability was also investigated. The results showed that the composition PLA/NBR/CaCO3 with higher NBR/CaCO3 content can be used in thermoforming applications.
AyutthayaWDPoompradubS. Thermal and mechanical properties of poly(lactic acid)/natural rubber blend using epoxidized natural rubber and poly(methyl methacrylate) as co-compatibilizers. Macromol Res2014; 22(7): 686–692.
2.
YuanDXuCChenZ, et al.Dynamically vulcanized biobased polylactide/natural rubber blend material with continuous cross-linked rubber phase. Polym Test2014; 38: 73–80.
3.
SookprasertPHinchirananN. Morphology, mechanical and thermal properties of poly(lactic acid) (PLA)/natural rubber (NR) blends compatibilized by NR-graft-PLA. J Mater Res2017; 32(4): 708–800.
4.
EseliniNTirkesSAkarAO, et al.Production and characterization of poly(lactic acid)-based biocomposites filled with basalt fiber and flax fiber hybrid. J Elastom Plast2020; 52(8): 701–716.
5.
PengNJuYLvR, et al.Toughening biodegradable polylactide with nanopores. J Polym Res2016; 23: 261–266.
6.
SajnaVPNayakSKMohantyS, et al.Weathering and biodegradation study on graft copolymer compatibilized hybrid bionanocomposites of poly(lactic acid). J Mater Eng Perform2016; 25(7): 2895–2906.
7.
LiuHChenFLiuB, et al.Towards high-performance poly(l-lactide)/elastomer blends with tunable interfacial adhesion and matrix crystallization via constructing stereocomplex crystallites at the interface. Macromolecules2010; 43: 6058–6066.
8.
LeeHChinIJ. Toughening effect of annealing-induced intermolecular crystallization of PBA-g-PLLA in PLA matrix. Macromol Res2016; 24(6): 515–521.
9.
LiuGCHeYSZengJB, et al.Fully biobased and supertough polylactide-based thermoplastic vulcanizates fabricated by peroxide-induced dynamic vulcanization and interfacial compatibilization. Biomacromolecules2014; 15(11): 4260–4271.
10.
SoleimaniMTabilLGOguochaI, et al.Interactive influence of biofiber composition and elastomer of physico-mechanical properties of PLA green-composites. J Polym Environ2018; 26(2): 532–542.
LiuHZhangJ. Research progress in toughening modification of poly(lactic acid). J Polym Sci Part B Polym Phys2011; 49: 1051–1083.
13.
Castro-AguirreEIniguez-FrancoFSamsudinH, et al.Poly(lactic acid)—mass production, processing, industrial applications, and end of life. Adv Drug Deliver Rev2016; 107: 333–366.
14.
NehraRMaitiSNJacobJ. Analytical interpretations of static and dynamic mechanical properties of thermoplastic elastomer toughened PLA blends. J Appl Polym Sci2018; 135(1): 1–13.
15.
LiYShimizuH. Toughening of polylactide by melt blending with a biodegradable poly(ether)urethane elastomer. Macromol Biosci2007; 7: 921–928.
16.
LiuHGuoLGuoX, et al.Effects of reactive blending temperature on impact toughness of poly(lactic acid) ternary blends. Polymer2012; 52: 272–276.
17.
Quiles-CarrilloLMontanesNPineiroF, et al.Ductility and toughness improvement of injection-molded compostable pieces of polylactide by melt blending with poly(ε-caprolactone) and thermoplastic starch. Materials2018; 11: 2138–2158.
18.
VargheseTVKumarHAAnithaS, et al.Reinforcement of acrylonitrile butadiene rubber using pristine few layer graphene and its hybrid fillers. Carbon2013; 61: 476–486.
19.
da RochaEBLinharesFNGabrielCF, et al.Stress relaxation of nitrile rubber composites filled with a hybrid metakaolin/carbon black filler under tensile and compressive forces. App Clay Sci2018; 151: 181–188.
20.
RazavizadehMJamshidiM.Adhesion of nitrile rubber (NBR) to polyethylene terephthalate (PET) fabric. Part 1: PET surface modification by methylene diphenyl diisocyanate (MDI). App Surf Sci2016; 360: 429–435.
21.
ReinholdsIKalkisVMerijs-MeriR, et al.Heat shrinkable behavior, physico-mechanical and structure properties of electron beam cross-linked blends of high-density polyethylene with acrylonitrile-butadiene rubber. Radiat Phys Chem2016; 120: 56–62.
22.
MaroufkhaniMKatbabALiuW, et al.Polylactide (PLA) and acrylonitrile butadiene rubber (NBR) blends: the effect of ACN content on morphology, compatibility and mechanical properties. Polymer2017; 115: 37–44.
23.
MaroufkhaniMKatbabAZhangJ. Manipulation of the properties of PLA nanocomposites by controlling the distribution of nanoclay via varying the acrylonitrile content in NBR rubber. Polym Test2018; 65: 313–321.
24.
WagnerMHBernnatASchulzeV. The rheology of the Rheotens test. J Rheol1998; 42(4): 917–928.
25.
NofarMSacligilDCarreauPJ, et al.Poly(lactic acid) blends: processing, properties and applications. Int J Biol Macromol2019; 125: 307–360.
26.
YuZWangCLiY, et al.Instrumented impact property and fracture process behavior of composite rubber toughened ABS terpolymer. J Appl Polym Sci2012; 128(4): 2468–2478.
27.
ÇobanOBoraMÖSinmazçelikT, et al.Fracture morphology and deformation characteristics of repeatedly impacted thermoplastic matrix composites. Mater Des2009; 30(3): 628–634.
28.
ChenJKinlochAJSprengerS, et al.The mechanical properties and toughening mechanisms of an epoxy polymer modified with polysiloxane-based core-shell particles. Polymer2013; 54: 4276–4289.
29.
ZhangYRheeKYParkSJ. Nanodiamond nanocluster-decorated graphene oxide/epoxy nanocomposites with enhanced mechanical behavior and stability. Compos Part B-Eng2017; 114: 111–120.
30.
ZuiderduinWCWestzaanCHuetinkJ, et al.Toughening of polypropylene with calcium carbonate particles. Polymer2003; 44: 261–275.
31.
ZhangYChoiJRParkSJ. Enhancing the heat and load transfer efficiency by optimizing the interface of hexagonal boron nitride/elastomer nanocomposites for thermal management applications. Polymer2018; 143: 1–9.
de Jesús Guadarrama-MedinaTPérez-GonzálezJde VargasLEnhanced melt strength and stretching of linear low-density polyethylene extruded under strong slip conditions. Rheol Acta2005; 44: 278–286.
34.
LiangJZTanLCWangKJ, et al.Melt elongation flow behavior of LDPE/LLDPE blends. Polym Test2015; 41: 133–139.
35.
LeeJKScottCEVirklerTL. Effects of ABS rubber particles on rheology, melt failure and thermoforming. Polym Eng Sci2002; 42: 1541–1557.
36.
KimHSParkBHChoiJH, et al.Mechanical properties and thermal stability of poly(l-lactide)/calcium carbonate composites. J Appl Polym Sci2008; 109: 3087–3092.
37.
ValapaRBPugazhenthiGKatiyarV. Hydrolytic degradation behavior of sucrose palmitate reinforced poly(lactic acid) nanocomposites. Int J Biol Macromol2016; 89: 70–80.
