Accelerated degradation of water borne acrylic nanocomposites used in outdoor protective coatings

详细信息    查看全文

• 作者：Thien Vuong Nguyen^a ; Phuong Nguyen Tri^b ; ^{phuong.nguyen.tri@umontreal.ca" class="auth_mail" title="E-mail the corresponding author} ; Tuan Dung Nguyen^a ; Rachid El Aidani^c ; Van Thanh Trinh^a ; Christian Decker^d
• 关键词：Water-borne acrylic coating ; Rutile TiO2 nanoparticles ; Photodegradation ; Accelerated aging
• 刊名：Polymer Degradation and Stability
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：128
• 期：Complete
• 页码：65-76
• 全文大小：3762 K

文摘

In this study, the degradation of a water-borne acrylic coating and the influence of rutile-TiO₂ (R–TiO₂) nanoparticles and a hindered amine light stabilizer (HALS) on its photo-stability in accelerated aging environment has been quantitatively studied by monitoring the chemical modifications occurring upon aging conditions. By using non-destructive analytical methods, like IR and UV-visible spectroscopy, 3D laser microscopy, SEM observations and weight loss measurements, it was possible to follow continuously the formation of photo-oxidative products and the loss of the binder functional groups on a sample undergoing accelerated aging. For the first time, numerous dark spots, randomly dispersed on the whole surface of the sample upon UV/condensation exposure are successfully observed and explained by using a novel technique 3D laser microscopy. Our findings also confirm that HALS greatly improved photo-stability to the coating thank to its free radical and hydrogen peroxide scavenging capacity. This work provides some useful information for a better understanding of the degradation behavior of water-borne acrylic coating under accelerated aging conditions.