TY - JOUR
T1 - Surface topography and cooling effects in poly(vinyl chloride) (PVC)/titanium dioxide (TiO2) composites exposed to UV-irradiation
AU - Xu, Sheng
AU - Xu, Jing
AU - Zhang, Jun
N1 - Publisher Copyright:
© 2018, Iran Polymer and Petrochemical Institute.
PY - 2018/12/1
Y1 - 2018/12/1
N2 - Rutile titanium dioxide (TiO2), at different amounts (0, 1, 3, 5, 8 and 10 phr), was used to prepare PVC/TiO2 composites as cool materials. Exposure to the ultraviolet (UV)-irradiation at 65 °C (black-panel thermometers) with a xenon arc as the light source (0.51 W/(m2 nm), 340 nm) for 200, 400 and 600 h resulted in the formation of polyene structure in PVC and causing discoloration. Besides, atomic force microscopy and roughness measurements were used to examine the changes in surface topography and roughness before and after UV-irradiation. Ethylenic index was used to characterize the aging degree of composites. The contact angle value of composites became smaller and their polarity increased after exposing to UV-irradiation, but the presence of TiO2 effectively prevented this process. In addition, exposure to UV-irradiation had little effect on the reflectance of PVC/TiO2 composites over the whole solar wavelength range (200–2500 nm), especially in near infrared (NIR) region (700–2500 nm). This allowed the TiO2-loaded samples to display an excellent cooling property whether indoors or outdoors. The addition of higher quantities of TiO2 led to higher efficiency of the cooling effect. In general, this study provides strong support for the property of long-term outdoor use of PVC/TiO2 composites with high solar reflectance and excellent cooling performance.
AB - Rutile titanium dioxide (TiO2), at different amounts (0, 1, 3, 5, 8 and 10 phr), was used to prepare PVC/TiO2 composites as cool materials. Exposure to the ultraviolet (UV)-irradiation at 65 °C (black-panel thermometers) with a xenon arc as the light source (0.51 W/(m2 nm), 340 nm) for 200, 400 and 600 h resulted in the formation of polyene structure in PVC and causing discoloration. Besides, atomic force microscopy and roughness measurements were used to examine the changes in surface topography and roughness before and after UV-irradiation. Ethylenic index was used to characterize the aging degree of composites. The contact angle value of composites became smaller and their polarity increased after exposing to UV-irradiation, but the presence of TiO2 effectively prevented this process. In addition, exposure to UV-irradiation had little effect on the reflectance of PVC/TiO2 composites over the whole solar wavelength range (200–2500 nm), especially in near infrared (NIR) region (700–2500 nm). This allowed the TiO2-loaded samples to display an excellent cooling property whether indoors or outdoors. The addition of higher quantities of TiO2 led to higher efficiency of the cooling effect. In general, this study provides strong support for the property of long-term outdoor use of PVC/TiO2 composites with high solar reflectance and excellent cooling performance.
KW - Cool material
KW - Photodegradation
KW - Poly(vinyl chloride)
KW - Surface topography
KW - Ultraviolet (UV)-irradiation
UR - http://www.scopus.com/inward/record.url?scp=85056795702&partnerID=8YFLogxK
U2 - 10.1007/s13726-018-0671-0
DO - 10.1007/s13726-018-0671-0
M3 - 文章
AN - SCOPUS:85056795702
SN - 1026-1265
VL - 27
SP - 1011
EP - 1022
JO - Iranian Polymer Journal (English Edition)
JF - Iranian Polymer Journal (English Edition)
IS - 12
ER -