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Investigation of photo‐oxidative effect on morphology and degradation of mechanical and physical properties of nano CaCO 3 silicone rubber composites
Author(s) -
Mishra Satyendra,
Shimpi Navinchandra G,
Mali Ananda D
Publication year - 2012
Publication title -
polymers for advanced technologies
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.61
H-Index - 90
eISSN - 1099-1581
pISSN - 1042-7147
DOI - 10.1002/pat.1861
Subject(s) - silicone rubber , materials science , stearic acid , composite material , fourier transform infrared spectroscopy , natural rubber , composite number , nanocomposite , filler (materials) , scanning electron microscope , silicone , degradation (telecommunications) , irradiation , chemical engineering , engineering , telecommunications , physics , computer science , nuclear physics
Photo‐oxidative degradation of treated and untreated nano CaCO 3 : silicone rubber composite was studied under accelerated UV irradiation (≥290 nm) at different time intervals. Prolonged exposure to UV leads to a progressive decrease in mechanical and physical properties along with the change in behavior of filler‐matrix interaction. This was due to decrease in cross‐linking density with increase in mobility of rubber chains. Meanwhile, synthesized nano CaCO 3 was modified with stearic acid for uniform dispersion in rubber matrix. The increase in carbonyl (>CO), hydroxyl (OH), CO 2 , and alkene functional groups on the UV exposed surface of treated and untreated nano CaCO 3 : silicone rubber composites at different time intervals was studied using Fourier transform infrared (FTIR) spectroscopy. The change in morphological behavior of filler‐matrix interaction after UV exposure was studied using SEM. Overall, the study showed that the treated nano CaCO 3 : silicone composites were affected more by UV exposure than untreated nano CaCO 3 : silicone composites and pristine composite after UV exposure. This effect was due to peeling of stearic acid from the surface of CaCO 3 , which makes the rubber chains slippery and thus separation of filler and rubber chains takes place with initiation of fast‐degradation. Copyright © 2011 John Wiley & Sons, Ltd.