The aim of this work was to evaluate the influence of the use of coupling agent (CA) on the properties of thermoplastic composites produced from post-consumer polypropylene (rPP) and malt bagasse fibers (MB) of brewing industry. The CA used was maleic anhydride graft polypropylene copolymer (MAgPP). The study was carried out in two stages: in first step the best concentration of MB fibers was verified, where was varied the fiber contents between 0, 10, 20 and 30% (w/w); in the second step, the best MB concentration evaluated was used with different CA concentrations (0, 1, 3, 5 and 7% w/w). Of the three MB concentrations evaluated as reinforcing filler, the sample with a 30% (w/w) ratio presented 44% lower deformation than the others, presenting better mechanical resistance, although it also presented the highest water absorption. Thus, the 30% MB fiber content was chosen for two step, where the results showed that the PP/MB-30 composite treated with 3% (w/w) CA had a modulus of elasticity 10.3% higher than the same composite without CA, corroborating with the morphological analysis, which indicated better interfacial adhesion between composite components when CA was used. The PP/MB-30 composite treated with 1% (w/w) CA showed the highest thermal stability among all samples.
LilaMKSinghalABanwaitSS, et al.A recyclability study of bagasse fiber reinforced polypropylene composites. Polym Degrad Stab2018; 152: 272–279.
2.
MucelinCABelliniMMucelinCA, et al. Lixo e impactos ambientais perceptíveis no ecossistema urbano. Soc Nat2008; 20: 111–124.
3.
World Wide Fund for Nature. Produção e reciclagem de plástico no mundo, https://www.wwf.org.br (accessed August 2020).
4.
SanjayMRSiengchinSParameswaranpillaiJ, et al. A comprehensive review of techniques for natural fibers as reinforcement in composites: preparation, processing and characterization. Carbohydr Polym2019; 207: 108–121.
5.
PickeringKLEfendyMGALeTM.A review of recent developments in natural fibre composites and their mechanical performance. Compos A Appl Sci Manuf2016; 83: 98–112.
6.
MattosBDMissoALde CademartoriPHG, et al. Properties of polypropylene composites filled with a mixture of household waste of mate-tea and wood particles. Construct Build Mater2014; 61: 60–68.
7.
MadhuPSanjayMRSenthamaraikannanP, et al. A review on synthesis and characterization of commercially available natural fibers: part II. J Natural Fibers2018; 16: 1–12.
8.
SullinsTPillaySKomusA, et al. Hemp fiber reinforced polypropylene composites: the effects of material treatments. Compos B Eng2017; 114: 15–22.
9.
BrochierMA.Aproveitamento de resíduo úmido de cervejaria na alimentação de cordeiros confinados em fase de terminação. Master's Dissertation - Postgraduate Program in Technological Management: Environmental Quality, Feevale University, Novo Hamburgo – RS, 2007.
RivaiMGuptaAIslamMR, et al. Characterization of oil palm empty fruit bunch and glass fibre reinforced recycled polypropylene hybrid composites. Fibers Polym2014; 15: 1523–1530.
12.
IslamMGuptaARivaiM, et al. Characterization of microwave-treated oil palm empty fruit bunch/glass fibre/polypropylene composites. J Thermoplast Compos Mater2017; 30: 986–1002.
13.
IslamMBegMMinaM.Fibre surface modifications through different treatments with the help of design expert software for natural fibre-based biocomposites. J Compos Mater2014; 48: 1887–1899.
14.
RamliRYunusRMBegMDH, et al. Effects of coupling agent on oil palm clinker and flour-filled polypropylene composites. J Reinf Plast Compos2011; 30: 431–439.
15.
IslamMRRivaiMGuptaA, et al. Characterization of ultrasound-treated oil palm empty fruit bunch-glass fiber-recycled polypropylene hybrid composites. J Polym Eng2015; 35: 135–143.
IslamMRGuptaARivaiM, et al. Effects of fiber-surface treatment on the properties of hybrid composites prepared from oil palm empty fruit bunch fibers, glass fibers, and recycled polypropylene. J Appl Polym Sci2016; 133: 1–10.
18.
IslamMRBegMDHGuptaA, et al. Optimal performances of ultrasound treated kenaf fiber reinforced recycled polypropylene composites as demonstrated by response surface method. J Appl Polym Sci2013; 128: 2847–2856.
CattoALDahlem JúniorMAHansenB, et al. Characterization of polypropylene composites using yerba mate fibers as reinforcing filler. Compos B Eng2019; 174: 106935.
21.
HansenBBorsoiCDahlem JúniorMA, et al. Thermal and thermo-mechanical properties of polypropylene composites using yerba mate residues as reinforcing filler. Industrial Crops Prod2019; 140: 111696.
22.
CattoALStefaniBVRibeiroVF, et al. Influence of coupling agent in compatibility of post-consumer HDPE in thermoplastic composites reinforced with eucalyptus fiber. Mater Res2014; 17: 203–209.
23.
American Society for Testing and Materials, ASTM. D-638: Standard test method for tensile properties of plastics, 2014.
24.
American Society for Testing and Materials, ASTM. D-256: Standard test methods for determining the Izod pendulum impact resistance of plastics, 2018.
25.
American Society for Testing and Materials, ASTM. D-570: Standard test method for water absorption of plastics, 2010.
26.
MaepaCEJayaramuduJOkonkwoJO, et al. Extraction and characterization of natural cellulose fibers from maize tassel. Int J Polym Anal Char2015; 20: 99–109.
27.
ArthanarieswaranVPKumaravelASaravanakumarSS.Characterization of new natural cellulosic fiber from acacia leucophloea bark. Int J Polym Anal Char2015; 20: 367–376.
28.
HoqueMBHossainMSNahidAMBariS, et al. Fabrication and characterization of pineapple fiber-reinforced polypropylene based composites. Nano Hybrids Compos2018; 21: 31–10.
29.
KayaNAtagurMAkyuzO, et al. Fabrication and characterization of olive pomace filled PP composites. Compos B Eng2018; 150: 277–283.
MelloLRPFVergílioRMMaliS.Caracterização Química e Funcional do Resíduo Fibroso da Indústria Cervejeira. BBR - Biochem Biotechnol2013; 2: 191.
32.
AnuarNISZakariaSKacoH, et al. Physico-mechanical, chemical composition, thermal degradation and crystallinity of oil palm empty fruit bunch, kenaf and polypropylene fibres: a comparatives study. Sains Malaysiana2018; 47: 839–851.
33.
BerzinFAmornsakchaiTLemaitreA, et al. Influence of fiber content on rheological and mechanical properties of pineapple leaf fibers-polypropylene composites prepared by twin-screw extrusion. Polym Compos2019; 40: 4519–4529.
34.
FlorindoDNF.Obtenção de compósitos poliméricos com fibras naturais de bagaço de malte. Graduation final paper – chemical engineering. Federal Technological University of Paraná, Ponta Grossa - PR, 2017.
35.
DaminKVSDa SilvaLMendesFB.Estudo da aplicação da fibra do caule do Zea mays nas propriedades do polipropileno. Revista Iberoamericana de Polímeros2016; 17: 62.
36.
SobczakLLangRWHaiderA.Polypropylene composites with natural fibers and wood – general mechanical property profiles. Compos Sci Technol2012; 72: 550.
37.
InácioALNNonatoRCBonseBC.Mechanical and thermal behavior of aged composites of recycled PP/EPDM/talc reinforced with bamboo fiber. Polym Test2018; 72: 357–363.
38.
PanthapulakkalSSainM.Studies on the water absorption properties of short hemp-glass fiber hybrid polypropylene composites. J Compos Mater2007; 41: 1871–1883.
39.
SantosEFMorescoMRosaSML, et al. Extrusion of PP composites with short coir fibers: effect of temperature and coupling agents. Polímeros (Online)2010; 20: 215–220.
40.
IshizakiMHVisconteLLYFurtadoCRG, et al. Mechanical and morphological characterization of polypropylene and green coconut fiber composites: influence of fiber content and mixture conditions. Polímeros: Ciência e Tecnologia2006; 16: 182–186.
41.
MulinariDRCiprianoJPCapriMR, et al. Influence of surgarcane bagasse fibers with modified surface on polypropylene composites. J Natural Fibers2018; 15: 174–182.
42.
RahemZMayoufIGuessoumM, et al. Compatibilization of biocomposites based on sponge-gourd natural fiber reinforced poly(lactic acid). Polym Compos2019; 40: 4489–4499.
43.
LauKHungPZhuM, et al. Properties of natural fiber composites for structural engineering applications. Compos B Eng2018; 136: 222–233.
44.
KuangXKuangRZhengX, et al. Mechanical properties and size stability of wheat straw and recycled LDPE composites coupled by waterborne coupling agents. Carbohydr Polyms2010; 80: 927–933.
45.
NewellJ.Fundamentos da moderna engenharia e ciência dos materiais. Rio de Janeiro, LTC, 2018, 43 pp.
46.
BeckerDKleinschmidtACBalzerPS, et al. Influence from the sequence for the mixture of PP-MA on the properties of PP and banana fiber composite. Polímeros: Ciência e Tecnologia2011; 21: 7–12.
47.
SabaNParidahMTJawaidM.Mechanical properties of kenaf fibre reinforced polymer composite: a review. Construct Build Mater2015; 76: 87–96.
48.
TanWHaoXFanQ, et al. Bamboo particle reinforced polypropylene composites made from different fractions of bamboo culm: fiber characterization and analysis of composite properties. Polym Compos2019; 40: 4619–4628.
49.
ChunKSYengCMHussiensyahS.Green coupling agent for agro-waste based thermoplastic composites. Polym Compos2018; 39: 2441–2450.
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