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Licensed Unlicensed Requires Authentication Published by De Gruyter July 12, 2022

Effect of mixing conditions and polymer particle size on the properties of polypropylene/graphite nanoplatelets micromoldings

Renze Jiang , Piyush Lashkari , Shengtai Zhou and Andrew N. Hrymak EMAIL logo

Abstract

In this study, properties of polypropylene/graphite nanoplatelets (PP/GNP) composites and corresponding micromoldings were systematically studied in terms of filler loading concentrations and mixing methods. PP of different forms, i.e., PP pellets and powders, were adopted to fabricate PP/GNP composites. Additionally, a comparative study of precoating GNP and PP powders using solvent-based solution blending and ultrasonication-assisted mixing was performed. Results showed that PP/GNP composites prepared using powder form PP resulted in at least one order of magnitude higher electrical conductivity than using pellet form PP and further reduced the percolation threshold from 12.5 to 10 wt%, which was related to the state of filler distribution within corresponding moldings. Morphology observations revealed that microparts prepared with powder-PP/GNP composites exhibited less preferential alignment of GNP particles along the flow direction when compared with those molded using pellet-PP/GNP counterparts, which was helpful in improving the overall electrical conductivity for PP/GNP micromoldings.


Corresponding author: Andrew N. Hrymak, Department of Chemical and Biochemical Engineering, The University of Western Ontario, London, ON, N6A5B9, Canada, E-mail:

  1. Author contributions: All the authors have accepted responsibility for the entire content of this submitted manuscript and approved submission.

  2. Research funding: The authors acknowledge the support of the Natural Sciences and Engineering Research Council of Canada Discovery Grants program (ANH). SZ is thankful for the support from the National Natural Science Foundation of China (52103040) and China Postdoctoral Science Foundation (2020M673217). RJ gratefully acknowledges support from Ontario Graduate Scholarship and Queen Elizabeth II Graduate Scholarship in Science and Technology.

  3. Conflict of interest statement: The authors declare no conflicts of interest regarding this article.

References

Abbasi, S., Carreau, P.J., and Derdouri, A. (2010). Flow induced orientation of multiwalled carbon nanotubes in polycarbonate nanocomposites: rheology, conductivity and mechanical properties. Polymer 51: 922–935, https://doi.org/10.1016/j.polymer.2009.12.041.Search in Google Scholar

Ahn, J.H. and Hong, B.H. (2014). Graphene for displays that bend. Nat. Nanotechnol. 9: 737–738, https://doi.org/10.1038/nnano.2014.226.Search in Google Scholar PubMed

Aïssa, B., Memon, N.K., Ali, A., and Khraisheh, M.K. (2015). Recent progress in the growth and applications of graphene as a smart material: a review. Front. Mater. 2: 58, https://doi.org/10.3389/fmats.2015.00058.Search in Google Scholar

Andrieux, G., Eloy, J.-C., and Mounier, E. (2015). Technologies and market trends for polymer MEMS in microfluidics and lab-on-chip. Proc. SPIE 5718, Microfluidics, BioMEMS, and Medical Microsystems III, pp. 60–64.10.1117/12.601554Search in Google Scholar

Arvidson, S.A., Khan, S.A., and Gorga, R.E. (2010). Mesomorphic-α-monoclinic phase transition in isotactic polypropylene: a study of processing effects on structure and mechanical properties. Macromolecules 43: 2916–2924, https://doi.org/10.1021/ma1001645.Search in Google Scholar

Attia, U.M., Marson, S., and Alcock, J.R. (2009). Micro-injection moulding of polymer microfluidic devices. Microfluid. Nanofluid. 7: 1–28, https://doi.org/10.1007/s10404-009-0421-x.Search in Google Scholar

Baig, Z., Mamat, O., Mustapha, M., Mumtaz, A., Munir, K.S., and Sarfraz, M. (2018). Investigation of tip sonication effects on structural quality of graphene nanoplatelets (GNPs) for superior solvent dispersion. Ultrason. Sonochem. 45: 133–149, https://doi.org/10.1016/j.ultsonch.2018.03.007.Search in Google Scholar PubMed

Bhuiyan, M.K.H., Rahman, M.M., Mina, M.F., Islam, M.R., Gafur, M.A., and Begum, A. (2013). Crystalline morphology and properties of multi-walled carbon nanotube filled isotactic polypropylene nanocomposites: influence of filler size and loading. Compos. Part A-Appl. S. 52: 70–79, https://doi.org/10.1016/j.compositesa.2013.05.011.Search in Google Scholar

Bories, M., Huneault, M.A., and Lafleur, P.G. (1999). Effect of twin-screw extruder design and process conditions on ultrafine CaCO3 dispersion into PP. Int. Polym. Proc. 14: 234–240, https://doi.org/10.3139/217.1551.Search in Google Scholar

Chiou, F. (2014). Microinjection molding. In: Bhushan, B. (Ed.), Encyclopedia of nanotechnology. Springer, Dordrecht, pp. 1–10.Search in Google Scholar

Chung, D.D.L. (2016). A review of exfoliated graphite. J. Mater. Sci. 51: 554–568, https://doi.org/10.1007/s10853-015-9284-6.Search in Google Scholar

Cipriano, B.H., Kota, A.K., Gershon, A.L., Laskowski, C.J., Kashiwagi, T., Bruck, H.A., and Raghavan, S.R. (2008). Conductivity enhancement of carbon nanotube and nanofiber-based polymer nanocomposites by melt annealing. Polymer 49: 4846–4851, https://doi.org/10.1016/j.polymer.2008.08.057.Search in Google Scholar

Covas, J.A. and Paiva, M.C. (2019). Chapter 3: monitoring dispersion and Re-agglomeration phenomena during the manufacture of polymer nanocomposites. In: Kenig, S. (Ed.), Processing of polymer nanocomposites. Hanser Publishers, Munich, pp. 97–120.10.3139/9781569906361.003Search in Google Scholar

Ding, W.W., Chen, Y.H., Liu, Z., and Yang, S. (2015). In situ nano-fibrillation of microinjection molded poly(lactic acid)/poly(ε-caprolactone) blends and comparison with conventional injection molding. RSC Adv. 5: 92905–92917, https://doi.org/10.1039/c5ra154.Search in Google Scholar

El Achaby, M., Arrakhiz, F.E., Vaudreuil, S., El Kacem Qaiss, A., Bousmina, M., and Fassi-Fehri, O. (2012). Mechanical, thermal, and rheological properties of graphene-based polypropylene nanocomposites prepared by melt mixing. Polym. Compos. 33: 733–744, https://doi.org/10.1002/pc.22198.Search in Google Scholar

Fan, H., Zhao, N., Wang, H., Xu, J., and Pan, F. (2014). 3D conductive network-based free-standing PANI-RGO-MWNTs hybrid film for high-performance flexible supercapacitor. J. Mater. Chem. A 2: 12340–12347, https://doi.org/10.1039/c4ta02118e.Search in Google Scholar

Gaska, K., Kádár, R., Rybak, A., Siwek, A., and Gubanski, S. (2017). Gas barrier, thermal, mechanical and rheological properties of highly aligned graphene-LDPE nanocomposites. Polymers 9: 294, https://doi.org/10.3390/polym9070294.Search in Google Scholar PubMed PubMed Central

He, S., Zhang, J., Xiao, X., Lai, Y., Chen, A., and Zhang, Z. (2017). Study on the morphology development and dispersion mechanism of polypropylene/graphene nanoplatelets composites for different shear field. Compos. Sci. Technol. 153: 209–221, https://doi.org/10.1016/j.compscitech.2017.10.024.Search in Google Scholar

Jiang, X. and Drzal, L.T. (2012). Reduction in percolation threshold of injection molded high-density polyethylene/exfoliated graphene nanoplatelets composites by solid state ball milling and solid state shear pulverization. J. Appl. Polym. Sci. 124: 525–535, https://doi.org/10.1002/app.34891.Search in Google Scholar

Jiang, Z., Chen, Y., and Liu, Z. (2014). The morphology, crystallization and conductive performance of a polyoxymethylene/carbon nanotube nanocomposite prepared under microinjection molding conditions. J. Polym. Res. 21: 451, https://doi.org/10.1007/s10965-014-0451-2.Search in Google Scholar

Kalaitzidou, K., Fukushima, H., Askeland, P., and Drzal, L.T. (2008). The nucleating effect of exfoliated graphite nanoplatelets and their influence on the crystal structure and electrical conductivity of polypropylene nanocomposites. J. Mater. Sci. 43: 2895–2907, https://doi.org/10.1007/s10853-007-1876-3.Search in Google Scholar

Kalaitzidou, K., Fukushima, H., and Drzal, L.T. (2007). A new compounding method for exfoliated graphite-polypropylene nanocomposites with enhanced flexural properties and lower percolation threshold. Compos. Sci. Technol. 67: 2045–2051, https://doi.org/10.1016/j.compscitech.2006.11.014.Search in Google Scholar

Kazemi, Y., Kakroodi, A.R., Wang, S., Ameli, A., Filleter, T., Pötschke, P., and Park, C.B. (2017). Conductive network formation and destruction in polypropylene/carbon nanotube composites via crystal control using supercritical carbon dioxide. Polymer 129: 179–188, https://doi.org/10.1016/j.polymer.2017.09.056.Search in Google Scholar

Kim, H., Abdala, A.A., and Macosko, C.W. (2010). Graphene/polymer nanocomposites. Macromolecules 43: 6515–6530, https://doi.org/10.1021/ma100572e.Search in Google Scholar

Lee, M.G., Lee, S., Cho, J., and Jho, J.Y. (2020). Improving dispersion and mechanical properties of polypropylene/graphene nanoplatelet composites by mixed solvent-assisted melt blending. Macromol. Res. 28: 1166–1173, https://doi.org/10.1007/s13233-020-8144-7.Search in Google Scholar

Li, D., Müller, M.B., Gilje, S., Kaner, R.B., and Wallace, G.G. (2008). Processable aqueous dispersions of graphene nanosheets. Nat. Nanotechnol. 3: 101–105, https://doi.org/10.1038/nnano.2007.451.Search in Google Scholar PubMed

Lozano, T., Lafleur, P.G., Grmela, M., and Thibodeau, C. (2004). Effect of filler dispersion on polypropylene morphology. Polym. Eng. Sci. 44: 880–890, https://doi.org/10.1002/pen.20079.Search in Google Scholar

Mittal, G., Dhand, V., Rhee, K.Y., Park, S.J., and Lee, W.R. (2015). A review on carbon nanotubes and graphene as fillers in reinforced polymer nanocomposites. J. Ind. Eng. Chem. 21: 11–25, https://doi.org/10.1016/j.jiec.2014.03.022.Search in Google Scholar

Moniruzzaman, M. and Winey, K.I. (2006). Polymer nanocomposites containing carbon nanotubes. Macromolecules 39: 5194–5205, https://doi.org/10.1021/ma060733p.Search in Google Scholar

Moriche, R., Prolongo, S.G., Sánchez, M., Jiménez-Suárez, A., Sayagués, M.J., and Ureña, A. (2015). Morphological changes on graphene nanoplatelets induced during dispersion into an epoxy resin by different methods. Compos. Part B Eng. 72: 199–205, https://doi.org/10.1016/j.compositesb.2014.12.012.Search in Google Scholar

Muthoosamy, K. and Manickam, S. (2017). State of the art and recent advances in the ultrasound-assisted synthesis, exfoliation and functionalization of graphene derivatives. Ultrason. Sonochem. 39: 478–493, https://doi.org/10.1016/j.ultsonch.2017.05.019.Search in Google Scholar PubMed

Nassar, M.M.A., Alzebdeh, K.I., Pervez, T., Al-Hinai, N., Munam, A., Al-Jahwari, F., and Sider, I. (2021). Polymer powder and pellets comparative performances as bio-based composites. Iran. Polym. J. 30: 269–283, https://doi.org/10.1007/s13726-020-00888-4.Search in Google Scholar

Pan, Y., Shi, S., Xu, W., Zheng, G., Dai, K., Liu, C., Chen, J., and Shen, C. (2014). Wide distribution of shish-kebab structure and tensile property of micro-injection-molded isotactic polypropylene microparts: a comparative study with injection-molded macroparts. J. Mater. Sci. 49: 1041–1048, https://doi.org/10.1007/s10853-013-7781-z.Search in Google Scholar

Park, H.M., Kalaitzidou, K., Fukushima, H., and Drzal, L.T. (2007). Exfoliated graphite nanoplatelet (xGnP)/polypropylene nanocomposites. In: SPE automotive and composites divisions – 7th annual automotive composites conference and exhibition. ACCE.Search in Google Scholar

Park, H.M., Kalaitzidou, K., Fukushima, H., and Drzal, L.T. (2008). Dispersion optimization of exfoliated graphite nanoplatelets in polypropylene: extrusion vs precoating of PP powder. In: International SAMPE technical conference.Search in Google Scholar

Park, J., Eom, K., Kwon, O., and Woo, S. (2001). Chemical etching technique for the investigation of melt-crystallized isotactic polypropylene spherulite and lamellar morphology by scanning electron microscopy. Microsc. Microanal. 7: 276–286, https://doi.org/10.1007/S100050010074.Search in Google Scholar

Ren, P.G., Wang, J., Fan, Q., Yang, S., Wu, Z.Q., Yan, D.X., and Chen, Y.H. (2019). Synergetic toughening effect of carbon nanotubes and β-nucleating agents on the polypropylene random copolymer/styrene-ethylene-butylene- styrene block copolymer blends. Polymers-BASEL 11: 2, https://doi.org/10.3390/polym11010029.Search in Google Scholar

Rennhofer, H. and Zanghellini, B. (2021). Dispersion state and damage of carbon nanotubes and carbon nanofibers by ultrasonic dispersion: a review. Nanomaterials-BASEL 11: 1469, https://doi.org/10.3390/nano11061469.Search in Google Scholar

Sandler, J.K.W., Kirk, J.E., Kinloch, I.A., Shaffer, M.S.P., and Windle, A.H. (2003). Ultra-low electrical percolation threshold in carbon-nanotube-epoxy composites. Polymer 44: 5893–5899, https://doi.org/10.1016/S0032-3861(03)00539-1.Search in Google Scholar

Sanes, J., Sánchez, C., Pamies, R., Avilés, M.D., and Bermúdez, M.D. (2020). Extrusion of polymer nanocomposites with graphene and graphene derivative nanofillers: an overview of recent developments. Materials-BASEL 13: 549, https://doi.org/10.3390/ma13030549.Search in Google Scholar PubMed PubMed Central

Satish, G., Prasad, V.V.S., and Ramji, K. (2017). Manufacturing and characterization of CNT based polymer composites. Math. Model. Eng. 3: 89–97, https://doi.org/10.21595/mme.2017.19121.Search in Google Scholar

Sengupta, R., Bhattacharya, M., Bandyopadhyay, S., and Bhowmick, A.K. (2011). A review on the mechanical and electrical properties of graphite and modified graphite reinforced polymer composites. Prog. Polym. Sci. 36: 638–670, https://doi.org/10.1016/j.progpolymsci.2010.11.003.Search in Google Scholar

Shiyanova, K.A., Gudkov, M.V., Gorenberg, A.Y., Rabchinskii, M.K., Smirnov, D.A., Shapetina, M.A., Gurinovich, T.D., Goncharuk, G.P., Kirilenko, D.A., Bazhenov, S.L., et al.. (2020). Segregated network polymer composites with high electrical conductivity and well mechanical properties based on PVC, P(VDF-TFE), UHMWPE, and rGO. ACS Omega 5: 25148–25155, https://doi.org/10.1021/acsomega.0c02859.Search in Google Scholar PubMed PubMed Central

Singh, K., Ohlan, A., and Dhawan, S.K. (2012). Chapter 3: polymer-graphene nanocomposites: preparation, characterization, properties, and applications. In: Ebrahimi, F. (Ed.), Nanocomposites - new trends and developments. IntechOpen, pp. 37–71.Search in Google Scholar

Skipa, T., Lellinger, D., Saphiannikova, M., and Alig, I. (2009). Shear-stimulated formation of multi-wall carbon nanotube networks in polymer melts. Phys. Status Solidi B 246: 2453–2456, https://doi.org/10.1002/pssb.200982265.Search in Google Scholar

Su, Y.C., Shah, J., and Lin, L. (2004). Implementation and analysis of polymeric microstructure replication by micro injection molding. J. Micromech. Microeng. 14: 415–422, https://doi.org/10.1088/0960-1317/14/3/015.Search in Google Scholar

Su, C., Lu, A., Xu, Y., Chen, F., Khlobystov, A.N., and Li, L. (2011). High-quality thin graphene films from fast electrochemical exfoliation. ACS Nano 5: 2332–2339, https://doi.org/10.1021/nn200025p.Search in Google Scholar PubMed

Vilaverde, C., Santos, R.M., Paiva, M.C., and Covas, J.A. (2015). Dispersion and re-agglomeration of graphite nanoplates in polypropylene melts under controlled flow conditions. Compos. Part A-Appl. S. 78: 143–151, https://doi.org/10.1016/j.compositesa.2015.08.010.Search in Google Scholar

Wanasinghe, D., Aslani, F., Ma, G., and Habibi, D. (2020). Review of polymer composites with diverse nanofillers for electromagnetic interference shielding. Nanomaterials-BASEL 10: 541, https://doi.org/10.3390/nano10030541.Search in Google Scholar PubMed PubMed Central

Wang, J., Kazemi, Y., Wang, S., Hamidinejad, M., Mahmud, M.B., Pötschke, P., and Park, C.B. (2020). Enhancing the electrical conductivity of PP/CNT nanocomposites through crystal-induced volume exclusion effect with a slow cooling rate. Compos. Part B-Eng. 183: 107663, https://doi.org/10.1016/j.compositesb.2019.107663.Search in Google Scholar

Whiteside, B.R., Martyn, M.T., and Coates, P.D. (2005). In-process monitoring of micromoulding - assessment of process variation. Int. Polym. Proc. 20: 162–169, https://doi.org/10.3139/217.1876.Search in Google Scholar

Wu, H. and Drzal, L.T. (2014). Effect of graphene nanoplatelets on coefficient of thermal expansion of polyetherimide composite. Mater. Chem. Phys. 146: 26–36, https://doi.org/10.1016/j.matchemphys.2014.02.038.Search in Google Scholar

Wu, H., Rook, B., and Drzal, L.T. (2013). Dispersion optimization of exfoliated graphene nanoplatelet in polyetherimide nanocomposites: extrusion, precoating, and solid state ball milling. Polym. Compos. 34: 426–432, https://doi.org/10.1002/pc.22425.Search in Google Scholar

Xu, N., DIng, E., and Xue, F. (2018). Influence of particle size of isotactic polypropylene (iPP) on barrier property against agglomeration of homogenized microcrystalline cellulose (HMCC) in iPP/HMCC composites. J. Polym. Eng. 38: 213–222, https://doi.org/10.1515/polyeng-2017-0004.Search in Google Scholar

Yang, C., Yin, X.H., and Cheng, G.M. (2013). Microinjection molding of microsystem components: new aspects in improving performance. J. Micromech. Microeng. 23: 093001, https://doi.org/10.1088/0960-1317/23/9/093001.Search in Google Scholar

Yu, J., Zhang, L.Q., Rogunova, M., Summers, J., Hiltner, A., and Baer, E. (2005). Conductivity of polyolefins filled with high-structure carbon black. J. Appl. Polym. Sci. 98: 1799–1805, https://doi.org/10.1002/app.22238.Search in Google Scholar

Yu, L., Koh, C.G., James Lee, L., Koelling, K.W., and Madou, M.J. (2002). Experimental investigation and numerical simulation of injection molding with micro-features. Polym. Eng. Sci. 42: 871–888, https://doi.org/10.1002/pen.10998.Search in Google Scholar

Zhang, W., He, W., and Jing, X. (2010). Preparation of a stable graphene dispersion with high concentration by ultrasound. J. Phys. Chem. B 114: 10368–10373, https://doi.org/10.1021/jp1037443.Search in Google Scholar PubMed

Zheng, W., Lu, X., Toh, C.L., Zheng, T.H., and He, C. (2004). Effects of clay on polymorphism of polypropylene in polypropylene/clay nanocomposites. J. Polym. Sci. Pol. Phys. 42: 1810–1816, https://doi.org/10.1002/polb.20043.Search in Google Scholar

Zhou, S., Hrymak, A., and Kamal, M. (2017a). Electrical and morphological properties of microinjection molded polypropylene/carbon nanocomposites. J. Appl. Polym. Sci. 134: 45462, https://doi.org/10.1002/app.45462.Search in Google Scholar

Zhou, S., Hrymak, A.N., and Kamal, M.R. (2017b). Electrical, morphological and thermal properties of microinjection molded polyamide 6/multi-walled carbon nanotubes nanocomposites. Compos. Part A-Appl. S. 103: 84–95, https://doi.org/10.1016/j.compositesa.2017.09.016.Search in Google Scholar

Zhou, S., Hrymak, A.N., and Kamal, M.R. (2018). Microinjection molding of multiwalled carbon nanotubes (CNT)–filled polycarbonate nanocomposites and comparison with electrical and morphological properties of various other CNT-filled thermoplastic micromoldings. Polym. Adv. Technol. 29: 1753–1764, https://doi.org/10.1002/pat.4282.Search in Google Scholar

Zhou, S., Hrymak, A.N., Kamal, M.R., and Jiang, R. (2019). Properties of microinjection-molded polypropylene/graphite composites. Polym. Eng. Sci. 59: 1560–1569, https://doi.org/10.1002/pen.25154.Search in Google Scholar

Received: 2022-01-06
Revised: 2022-04-29
Accepted: 2022-05-07
Published Online: 2022-07-12
Published in Print: 2022-09-27

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