Conductive Thermoplastic Starch (TPS) Composite Filled with Waste Iron Filings

Danilo Battistelli, Diana P. Ferreira, Sofia Costa, Carlo Santulli, Raul Fangueiro


A thermoplastic starch (TPS) was produced, starting with potato starch, glycerol and acetic acid, to shape it in films of thickness around 100 microns. To TPS iron waste filing particles, in the amount of 12% the weight of starch, were introduced in different modalities: as received, reduced in size by the use of a mortar, after treatment with hydrochloric acid, and after treatment and removal of hydrochloric acid. Morphological studies were carried out by optical and scanning electron microscopy and illustrated that the dispersion of iron filings was not optimal, though some improvement was observed by a reduced dimension of the particles. Tensile tests indicated the considerable improvement of stiffness offered by the insertion of iron particles to TPS, although the ultimate strain was reduced to less than 10%. Thermal characterization using thermogravimetry allowed revealing the three typical peaks for potato starch degradation, with only a slight decrease due to iron introduction. EDS allowed evaluating the presence of impurities in the iron filings and evidenced that the presence of iron was more effective on the surface than in the rest of the film. As a final consideration, An improvement in electrical conductivity by over an order of magnitude was obtained by the TPS+Fe+HCl film with respect to pure TPS.


Iron Waste; Starch; Composites; Electrical Conductivity; Mechanical Properties.


Gheju, M, and A Iovi. “Kinetics of Hexavalent Chromium Reduction by Scrap Iron.” Journal of Hazardous Materials 135, no. 1–3 (July 31, 2006): 66–73. doi:10.1016/j.jhazmat.2005.10.060.

Adeyanju, A.A., and K. Manohar. “Effects of Steel Fibers and Iron Filings on Thermal and Mechanical Properties of Concrete for Energy Storage Application.” Journal of Minerals and Materials Characterization and Engineering 10, no. 15 (2011): 1429–1448. doi:10.4236/jmmce.2011.1015111.

Sahay JS; Nagpal OP. Prasad S, Waste management of steel slag, Steel Times International; Redhill 24 (2), 2000, 38-40, 43.

Rodriguez-Gonzalez, F.J., B.A. Ramsay, and B.D. Favis. “Rheological and Thermal Properties of Thermoplastic Starch with High Glycerol Content.” Carbohydrate Polymers 58, no. 2 (November 2004): 139–147. doi:10.1016/j.carbpol.2004.06.002.

Shogren, R.L. “Modification of Maize Starch by Thermal Processing in Glacial Acetic Acid.” Carbohydrate Polymers 43, no. 4 (December 2000): 309–315. doi:10.1016/s0144-8617(00)00178-8.

Park, Hwan‐Man, Xiucuo Li, Chang‐Zhu Jin, Chan‐Young Park, Won‐Jei Cho, and Chang‐Sik Ha. "Preparation and properties of biodegradable thermoplastic starch/clay hybrids." Macromolecular Materials and Engineering 287, no. 8 (2002): 553-558. doi:10.1002/1439-2054(20020801)287:8<553::AID-MAME553>3.0.CO;2-3.

Troiano, M., C. Santulli, G. Roselli, Girolami Di, P. Cinaglia, and A. Gkrilla. “DIY Bioplastics from Peanut Hulls Waste in a Starch-Milk Based Matrix.” FME Transactions 46, no. 4 (2018): 503–512. doi:10.5937/fmet1804503t.

Galentsios, Chiara, Carlo Santulli, and Mirco Palpacelli. "DIY bioplastic material developed from banana skin waste and aromatised for the production of bijoutry objects." Journal of Basic and Applied Research International (2017): 138-150.

Chiang, C. K., C. R. Fincher, Y. W. Park, A. J. Heeger, H. Shirakawa, E. J. Louis, S. C. Gau, and Alan G. MacDiarmid. “Electrical Conductivity in Doped Polyacetylene.” Physical Review Letters 39, no. 17 (October 24, 1977): 1098–1101. doi:10.1103/physrevlett.39.1098.

Yang, Y., M. C. Gupta, K. L. Dudley, and R. W. Lawrence. “Conductive Carbon Nanofiber-Polymer Foam Structures.” Advanced Materials 17, no. 16 (August 18, 2005): 1999–2003. doi:10.1002/adma.200500615.

Khiar, A. S. Ahmad, and A. K. Arof. “Conductivity Studies of Starch-Based Polymer Electrolytes.” Ionics 16, no. 2 (May 28, 2009): 123–129. doi:10.1007/s11581-009-0356-y.

Liao, Chi-Shun, Kuo-Ren Lou, and Ching-Tzu Gao. “Sustainable Development of Electrical and Electronic Equipment: User-Driven Green Design for Cell Phones.” Business Strategy and the Environment 22, no. 1 (March 21, 2012): 36–48. doi:10.1002/bse.743.

Youssef, Ahmed M. “Morphological Studies of Polyaniline Nanocomposite Based Mesostructured TiO2 Nanowires as Conductive Packaging Materials.” RSC Advances 4, no. 13 (2014): 6811. doi:10.1039/c3ra44658a.

Battistelli, Danilo, and Carlo Santulli. 2019. “Production and Tensile Characterization of Thermoplastic Starch Films Filled With Iron Scrap Powder Waste and Molded on Different Support Materials”. Journal of Materials Science Research and Reviews 3 (4), 1-8.

Lai, Vivian M.-F., Piotr Tomasik, Ming-Tsung Yen, Wei-Ling Hung, and Cheng-yi Lii. “Re-Examination of the Interactions Between Starch and Salts of Metals from the Non-Transition Groups.” International Journal of Food Science and Technology 36, no. 3 (March 2001): 321–330. doi:10.1046/j.1365-2621.2001.t01-1-00463.x.

Shen, Yi, Lidija Posavec, Sreenath Bolisetty, Florentine M. Hilty, Gustav Nyström, Joachim Kohlbrecher, Monika Hilbe, et al. “Amyloid Fibril Systems Reduce, Stabilize and Deliver Bioavailable Nanosized Iron.” Nature Nanotechnology 12, no. 7 (April 24, 2017): 642–647. doi:10.1038/nnano.2017.58.

Zhong, Hua, Mark L. Brusseau, Yake Wang, Ni Yan, Lauren Quig, and Gwynn R. Johnson. “In-Situ Activation of Persulfate by Iron Filings and Degradation of 1,4-Dioxane.” Water Research 83 (October 2015): 104–111. doi:10.1016/j.watres.2015.06.025.

Estevez-Areco, Santiago, Lucas Guz, Lucía Famá, Roberto Candal, and Silvia Goyanes. “Bioactive Starch Nanocomposite Films with Antioxidant Activity and Enhanced Mechanical Properties Obtained by Extrusion Followed by Thermo-Compression.” Food Hydrocolloids 96 (November 2019): 518–528. doi:10.1016/j.foodhyd.2019.05.054.

García, Nancy L., Laura Ribba, Alain Dufresne, Mirta Aranguren, and Silvia Goyanes. “Effect of Glycerol on the Morphology of Nanocomposites Made from Thermoplastic Starch and Starch Nanocrystals.” Carbohydrate Polymers 84, no. 1 (February 2011): 203–210. doi:10.1016/j.carbpol.2010.11.024.

Rodriguez-Gonzalez, F.J., B.A. Ramsay, and B.D. Favis. “Rheological and Thermal Properties of Thermoplastic Starch with High Glycerol Content.” Carbohydrate Polymers 58, no. 2 (November 2004): 139–147. doi:10.1016/j.carbpol.2004.06.002.

Jiugao, Yu, Wang Ning, and Ma Xiaofei. “The Effects of Citric Acid on the Properties of Thermoplastic Starch Plasticized by Glycerol.” Starch - Stärke 57, no. 10 (October 2005): 494–504. doi:10.1002/star.200500423.

Sessini, Valentina, Marina P. Arrieta, José Maria Kenny, and Laura Peponi. “Processing of Edible Films Based on Nanoreinforced Gelatinized Starch.” Polymer Degradation and Stability 132 (October 2016): 157–168. doi:10.1016/j.polymdegradstab.2016.02.026.

Musa MB, Yoo MJ, Kang TJ, Kolawole EG, Ishiaku US, Yakubu MK, Whang DJ, Characterization and thermomechanical properties of thermoplastic potato starch, Research and Reviews: Journal of Engineering and Technology 2 (4), 2013, 9-16.

Scognamiglio, Fabrizio, Daniele Mirabile Gattia, Graziella Roselli, Franca Persia, Ugo De Angelis, and Carlo Santulli. “Thermoplastic Starch Films Added with Dry Nopal (Opuntia Ficus Indica) Fibers.” Fibers 7, no. 11 (November 19, 2019): 99. doi:10.3390/fib7110099.

Alzaet AN, Effect of iron filings in concrete compression and tensile strength, International Journal of Recent Development in Engineering and Technology 3 (4), 2014, 121-125.

Li, Hongbo, and Michel A. Huneault. “Effect of Chain Extension on the Properties of PLA/TPS Blends.” Journal of Applied Polymer Science 122, no. 1 (April 19, 2011): 134–141. doi:10.1002/app.33981.

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DOI: 10.28991/esj-2020-01218


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