Page 29 - Handbook of Surface Improvement and Modification

24 Scratch and Mar Resistance

38
propyltrimethoxysilane to improve their adhesion, dispersion, and compatibility. Macro-
scratch and nano-scratch testers were employed to characterize the scratch and mar resis-
38
tances. The modified silica parti-
cles increased scratch and mar
resistance and reduced transpar-
ency to a lower extent than the
38
unmodified silica.
Surface mechanical proper-
ties of poly(urethane acrylate)/sil-
ica hybrid interpenetrating
polymer network coatings have
39
been studied. With the silica
content increasing, the indentation
and pencil hardness increased,
while failure strain during stretch-
39
ing test decreased. The hybrid
IPN coating with its balanced dis-
sipative and elastic properties
Figure 2.20. Indentation hardness as a function of volume and improved the scratch resistance of
39
weight percentages of silica. [Adapted, by permission, from the coating. Figure 2.20 shows
Um, MS; Ham, DS; Cho, SK; Lee, S-J; Kim, KJ; Lee, JH; the effect of silica load on coating
Choa, S-H; Jung, HW; Choi, WJ, Prog. Org. Coat., 97, 166-74, 39
2016.] hardness.