Chemical treatments' effect on the structural and mecha-nical properties of polyvinyl alcohol/spent coffee ground composite films

Muhibbuddin Muhibbuddin, Farid Ilham, Ikramullah Muhammad, Samsul Rizal

Abstract


Chemical treatments are a common strategy for improving the compatibility of natural fillers with polymer matrices. However, their specific impact on Spent Coffee Grounds (SCG) as reinforcement for Polyvinyl Alcohol (PVA) composites remains unclear. This study investigates the effects of alkalization, bleaching, and acid hydrolysis on the structural and mechanical properties of PVA/SCG composite films. The SCG was treated with 10% NaOH, 10% NaOCl, and 1 M Hâ‚‚SOâ‚„. FTIR analysis showed that untreated SCG exhibited characteristic C–H stretching peaks at 2922 cmâ»Â¹ and 2853 cmâ»Â¹, corresponding to methyl and methylene groups in cellulose and hemicellulose. After alkalization and bleaching, these peaks nearly disappeared, indicating excessive removal of hemicellulose and lignin and suggesting structural degradation of the filler. In contrast, acid hydrolysis largely preserved these peaks, reflecting milder structural modification. Mechanical testing confirmed this trend: the untreated composite achieved the best performance, with tensile strength of 2.30 MPa and tear resistance of 2.12 N All chemically treated samples showed reduced strength and toughness, with alkalization being the most detrimental. These findings demonstrate that the decline in mechanical properties is directly correlated with structural damage detected by FTIR, emphasizing the need to optimize treatment severity.


Keywords


Alkalization;bleaching; acid hydrolysis; polyvinyl alcohol (PVA); spent coffee ground (SGC)

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References


S. Rizal et al., “Properties and Characterization of Lignin Nanoparticles Functionalized in Macroalgae Biopolymer Films,†Nanomaterials, vol. 11, no. 3, p. 637, Mar. 2021, doi: 10.3390/nano11030637.

M. Aslam, M. A. Kalyar, and Z. A. Raza, “Polyvinyl alcohol: A review of research status and use of polyvinyl alcohol based nanocomposites,†Polym. Eng. Sci., vol. 58, no. 12, pp. 2119–2132, 2018.

S. K. Karmee, “A spent coffee grounds based biorefinery for the production of biofuels, biopolymers, antioxidants and biocomposites,†Waste Manag., vol. 72, pp. 240–254, Feb. 2018, doi: 10.1016/j.wasman.2017.10.042.

S. I. Mussatto, L. M. Carneiro, J. P. A. Silva, I. C. Roberto, and J. A. Teixeira, “A study on chemical constituents and sugars extraction from spent coffee grounds,†Carbohydr. Polym., vol. 83, no. 2, pp. 368–374, Jan. 2011, doi: 10.1016/j.carbpol.2010.07.063.

R. Campos-Vega, G. Loarca-Piña, H. A. Vergara-Castañeda, and B. D. Oomah, “Spent coffee grounds: A review on current research and future prospects,†Trends Food Sci. Technol., vol. 45, no. 1, pp. 24–36, Sep. 2015, doi: 10.1016/j.tifs.2015.04.012.

R. Fachri, S. Rizal, S. Huzni, I. Ikramullah, and S. Aprilia, “Production of Cellulose Nanocrystal (CNC) Combine with Silane Treatment from Pennisetum Purpureum via Acid Hydrolysis,†2024, pp. 535–543. doi: 10.1007/978-981-99-7495-5_51.

F. Bolat, J. Ghitman, M. I. Necolau, E. Vasile, and H. Iovu, “A Comparative Study of the Impact of the Bleaching Method on the Production and Characterization of Cotton-Origin Nanocrystalline Cellulose by Acid and Enzymatic Hydrolysis,†Polymers (Basel)., vol. 15, no. 16, p. 3446, Aug. 2023, doi: 10.3390/polym15163446.

F. Fitriani et al., “Optimization of Biocomposite Film Based on Whey Protein Isolate and Nanocrystalline Cellulose from Pineapple Crown Leaf Using Response Surface Methodology,†Polymers (Basel)., vol. 14, no. 15, Aug. 2022, doi: 10.3390/polym14153006.

M. J. M. Ridzuan, M. S. A. Majid, M. Afendi, K. Azduwin, S. N. A. Kanafiah, and Y. Dan-mallam, “The Effects of the Alkaline Treatment’s Soaking Exposure on the Tensile Strength of Napier Fibre,†Procedia Manuf., vol. 2, no. February, pp. 353–358, 2015, doi: 10.1016/j.promfg.2015.07.062.

R. Thandavamoorthy, Y. Devarajan, and S. Thanappan, “Analysis of the characterization of NaOH-treated natural cellulose fibre extracted from banyan aerial roots,†Sci. Rep., vol. 13, no. 1, pp. 1–8, 2023, doi: 10.1038/s41598-023-39229-9.

Y. C. Ching, A. Rahman, K. Y. Ching, N. L. Sukiman, and H. C. Cheng, “Preparation and Characterization of Polyvinyl Alcohol-Based Composite Reinforced with Nanocellulose and Nanosilica,†BioResources, vol. 10, no. 2, Apr. 2015, doi: 10.15376/biores.10.2.3364-3377.

F. Fitriani et al., “Formulation optimization of bionanocomposite film based on polyvinyl alcohol/glycerol/cellulose nanocrystal from pineapple crown leave fibers using response surface methodology,†IOP Conf. Ser. Earth Environ. Sci., vol. 1290, no. 1, p. 012010, Jan. 2024, doi: 10.1088/1755-1315/1290/1/012010.

M. Alizadeh-Sani, A. Khezerlou, and A. Ehsani, “Fabrication and characterization of the bionanocomposite film based on whey protein biopolymer loaded with TiO2 nanoparticles, cellulose nanofibers and rosemary essential oil,†Ind. Crops Prod., vol. 124, pp. 300–315, Nov. 2018, doi: 10.1016/j.indcrop.2018.08.001.

ASTM D882-10, “Standard Test Method for Tensile Properties of Thin Plastic Sheeting,†Am. Soc. Test. Mater., 2012.

R. K. Ulaganathan, N. A. Mohamad Senusi, M. A. Mohd Amin, M. K. A. Abdul Razab, A. Ismardi, and N. H. Abdullah, “Effect of cellulose nanocrystals (CNC) on PVA/CNC bio-nanocomposite film as potential food packaging application,†Mater. Today Proc., vol. 66, pp. 3150–3153, 2022, doi: 10.1016/j.matpr.2022.07.466.

R. Vijay, D. L. Singaravelu, A. Vinod, M. . Sanjay, and S. Siengchin, “Characterization of Alkali-Treated and Untreated Natural Fibers from the Stem of Parthenium Hysterophorus,†J. Nat. Fibers, vol. 18, no. 1, pp. 80–90, Jan. 2021, doi: 10.1080/15440478.2019.1612308.

E. S. Rodriguez-Quiroz, O. Olivares-Xometl, V. Santacruz-Vázquez, C. Santacruz-Vázquez, P. Arellanes-Lozada, and E. Rubio-Rosas, “Production of Cellulosic Microfibers from Coffee Pulp via Alkaline Treatment, Bleaching and Acid Hydrolysis,†Materials (Basel)., vol. 16, no. 24, p. 7607, Dec. 2023, doi: 10.3390/ma16247607.

K. E. Borchani, C. Carrot, and M. Jaziri, “Untreated and alkali treated fibers from Alfa stem: effect of alkali treatment on structural, morphological and thermal features,†Cellulose, vol. 22, no. 3, pp. 1577–1589, 2015, doi: 10.1007/s10570-015-0583-5.

Y. Qin, H. Zhang, Y. Dai, H. Hou, and H. Dong, “Effect of Alkali Treatment on Structure and Properties of High Amylose Corn Starch Film,†Materials (Basel)., vol. 12, no. 10, p. 1705, May 2019, doi: 10.3390/ma12101705.

S. Rizal et al., “Isolation of Textile Waste Cellulose Nanofibrillated Fibre Reinforced in Polylactic Acid-Chitin Biodegradable Composite for Green Packaging Application,†Polymers (Basel)., vol. 13, no. 3, p. 325, Jan. 2021, doi: 10.3390/polym13030325.

M. Hasan et al., “Evaluation of the thermomechanical properties and biodegradation of brown rice starch-based chitosan biodegradable composite films,†Int. J. Biol. Macromol., vol. 156, pp. 896–905, Aug. 2020, doi: 10.1016/j.ijbiomac.2020.04.039.

S. Rizal et al., “Preparation and Characterization of Nanocellulose/Chitosan Aerogel Scaffolds Using Chemical-Free Approach,†Gels, vol. 7, no. 4, p. 246, Dec. 2021, doi: 10.3390/gels7040246.

M. Chandrasekar, M. R. Ishak, S. M. Sapuan, Z. Leman, and M. Jawaid, “A review on the characterisation of natural fibres and their composites after alkali treatment and water absorption,†Plast. Rubber Compos., vol. 46, no. 3, pp. 119–136, 2017, doi: 10.1080/14658011.2017.1298550.

Ikramullah, S. Rizal, S. Thalib, and S. Huzni, “Hemicellulose and lignin removal on typha fiber by alkali treatment,†IOP Conf. Ser. Mater. Sci. Eng., vol. 352, p. 012019, May 2018, doi: 10.1088/1757-899X/352/1/012019.

A. E. Bekele, H. G. Lemu, and M. G. Jiru, “Study of the Effects of Alkali Treatment and Fiber Orientation on Mechanical Properties of Enset/Sisal Polymer Hybrid Composite,†J. Compos. Sci., vol. 7, no. 1, p. 37, Jan. 2023, doi: 10.3390/jcs7010037.

W. FrÄ…cz, G. Janowski, and Å. BÄ…k, “Influence of the Alkali Treatment of Flax and Hemp Fibers on the Properties of PHBV Based Biocomposites,†Polymers (Basel)., vol. 13, no. 12, p. 1965, Jun. 2021, doi: 10.3390/polym13121965.

H. Abral et al., “Alkali Treatment of Screw Pine (Pandanus Odoratissimus) Fibers and Its Effect on Unsaturated Polyester Composites,†Polym. - Plast. Technol. Eng., vol. 51, no. 1, pp. 12–18, 2012, doi: 10.1080/03602559.2011.593090.

A. Benyahia, A. Merrouche, Z. E. A. Rahmouni, M. Rokbi, W. Serge, and Z. Kouadri, “Study of the alkali treatment effect on the mechanical behavior of the composite unsaturated polyester-Alfa fibers,†Mech. Ind., vol. 15, no. 1, pp. 69–73, 2014, doi: 10.1051/meca/2013082.

K. J. Wong, B. F. Yousif, and K. O. Low, “The effects of alkali treatment on the interfacial adhesion of bamboo fibres,†Proc. Inst. Mech. Eng. Part L J. Mater. Des. Appl., vol. 224, no. 3, pp. 139–148, 2010, doi: 10.1243/14644207JMDA304.

Y. A. Husnil, E. Yuanita, N. Ramadhani, and M. Chalid, “Study on the Effect of Bleaching Treatment on the Mechanical Properties of Kenaf Fibers,†Mater. Sci. Forum, vol. 1000, pp. 278–284, Jul. 2020, doi: 10.4028/www.scientific.net/MSF.1000.278.

J. Tang, K. Chen, J. Xu, J. Li, and C. Zhao, “Effects of dilute acid hydrolysis on composition and structure of cellulose in eulaliopsis binata,†BioResources, vol. 6, no. 2, pp. 1069–1078, 2011, doi: 10.15376/biores.6.2.1069-1078.

J. K. W. Chang, X. Duret, V. Berberi, H. Zahedi-Niaki, and J. M. Lavoie, “Two-step thermochemical cellulose hydrolysis with partial neutralization for glucose production,†Front. Chem., vol. 6, no. APR, pp. 1–11, 2018, doi: 10.3389/fchem.2018.00117.

M. I. Ioelovich, “Study on Acidic Degradation of Cellulose,†Innov. Corros. Mater. Sci. (Formerly Recent Patents Corros. Sci., vol. 7, no. 1, pp. 62–65, 2017, doi: 10.2174/2352094907666161209150635.

P. Sreekumar, S. Manirul Haque, H. M. Afzal, Z. Sadique, and M. A. Al-Harthi, “Preparation and characterization of microcellulose reinforced polyvinyl alcohol/starch biocomposites,†J. Compos. Mater., vol. 53, no. 14, pp. 1933–1939, Jun. 2019, doi: 10.1177/0021998318816437.

M. A. S. Azizi Samir, F. Alloin, and A. Dufresne, “Review of Recent Research into Cellulosic Whiskers, Their Properties and Their Application in Nanocomposite Field,†Biomacromolecules, vol. 6, no. 2, pp. 612–626, Mar. 2005, doi: 10.1021/bm0493685.




DOI: http://dx.doi.org/10.30811/jpl.v23i5.7204

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