Improved Hardness of Nanocomposite Films on PMMA Sheet Using Beadmilled-SiO₂ Nanoparticle in Dowanol PM

Abstract:

The main objective of this study was to prepare bead milled-silica nanoparticles (SiO₂) as reinforcing materials for transparent hard coating films. SiO₂ dispersed in Dowanol PM without any stabilizer was used as a main component in the nanocomposite hard coating films to improve hardness of Poly methyl methacrylate (PMMA) sheets. However, the major challenge in hard coating formulation is the dispersion of nanoscale SiO₂ particles. Bead milling machine (MiniCer, NETZSCH, Germany) equipped with different sizes of zirconia (ZrO₂) beads (0.1, 0.5, and 1.0 mm) was used for dispersing 40wt% SiO₂ in Dowanol PM to achieve target sizes of 200, 500, and 800 nm. The dispersed nanoparticles were characterized by UV-visible spectroscopy for their optical transmission, transmission electron microscopy (TEM) for particle morphologies, and dynamic light scattering technique (DLS) for the particles sizes. The milled-SiO₂ nanoparticles were stable in Dowanol PM as suspensions with their particles sizes closed to the target sizes. The 200-nm suspension showed the longest storage time without any aggregate formation. Whereas, the dispersed nanoparticles suspensions with the particles size >500 nm formed agglomerates during storage. The SiO₂/MTMS nanocomposite coating film was then prepared coated milled-SiO₂ suspension in Dowanol PM on PMMA sheets. The film with 200 nm SiO₂ showed the highest transparency (92% at 550 nm) which was like the uncoated PMMA sheets. At thickness of 3-microns, SiO₂/MTMS nanocomposite films could improve pencil hardness of PMMA sheets from <H to 3H.

• Periodical: Materials Science Forum (Volume 911)
• Pages: 61-65
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.911.61
• Online since: January 2018
• Authors: Siraprapa Lhosupasirirat, Taksorn Jirathampradhab, Nuttawee Niamsiri, Tanakorn Osotchan, Toemsak Srikhirin*
• Keywords: Bead Milling, Colloidal, Nanocomposite, Nanoparticles, SiO₂ Nanoparticles

References

[1] E. Amerio, P. Fabbri, G. Malucelli, M. Messori, M. Sangermano and R. Taurino: Progress in Organic Coatings, 62 (2008) 129-133.

DOI: 10.1016/j.porgcoat.2007.10.003

[2] L. Xu, R.G. Karunakaran, J. Guo and S. Yang, ACS Applied Materials & Interfaces, 4 (2012) 1118-1125.

[3] K.R. Arturi, H. Jepsen, J.N. Callsen, E.G. Søgaard and M.E. Simonsen, Progress in Organic Coatings, 90 (2016) 132-138.

DOI: 10.1016/j.porgcoat.2015.10.001

[4] S. Liang, N.M. Neisius and S. Gaan, Progress in Organic Coatings, 76 (2013) 1642-1665.

DOI: 10.1016/j.porgcoat.2013.07.014

[5] S. Zhou, L. Wu, J. Sun and W. Shen, Progress in Organic Coatings, 45 (2002) 33-42.

[6] W. Stöber, A. Fink and E. Bohn, Journal of Colloid and Interface Science, 26 (1968) 62-69.

[7] V.S. Nguyen, D. Rouxel, R. Hadji, B. Vincent and Y. Fort, Ultrasonics Sonochemistry, 18 (2011) 382-388.

DOI: 10.1016/j.ultsonch.2010.07.003

[8] I.N. Seekkuarachchi, K. Tanaka and H. Kumazawa, Chemical Engineering Science, 63 (2008) 2341-2366.

[9] M. Sivasubramanian, K. Nedunjezhian, S. Murugesan and R. Kalpoondi Sekar, Applied Thermal Engineering, 44 (2012) 1-10.

DOI: 10.1016/j.applthermaleng.2012.04.004

[10] M. Inkyo, T. Tahara, T. Iwaki, F. Iskandar, C.J. Hogan Jr and K. Okuyama, Journal of Colloid and Interface Science, 304 (2006) 535-540.

DOI: 10.1016/j.jcis.2006.09.021

[11] T. Yamamoto, Y. Harada, K. Fukui and H. Yoshida, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 362 (2010) 97-101.

DOI: 10.1016/j.colsurfa.2010.03.046

[12] I.M. Joni, A. Purwanto, F. Iskandar and K. Okuyama, Industrial & Engineering Chemistry Research, 48 (2009) 6916-6922.

[13] I.M. Joni, R. Balgis, T. Ogi, T. Iwaki and K. Okuyama, Colloids and Surfaces A: Physicochemical and Engineering Aspects, 388 (2011) 49-58.

DOI: 10.1016/j.colsurfa.2011.08.007

[14] Information on http: /www. netzsch-grinding. com.