Effectiveness of a plant polymer as an antioxidant (original) (raw)
Related papers
SPE Polymers
Natural rubber (NR) is sensitive to oxidative degradation, which needs to add commercial antioxidant for NR compounding to improve its aging properties. The aim of this study is to apply natural antioxidant obtained from extracted rambutan peel powder (RE) by methanol compared to commercial antioxidants for NR compounding in a conventional vulcanization (CV system). Two types of commercial antioxidants were N‐(1,3‐dimethylbutyl)‐N'phenyl‐p‐phenylenediamine (6PPD) and 2,2,4‐Trimethyl‐1,2dihydroquinoline (TMQ). The main phenolic compounds in RE were geraniin, corilagin, ellagic acid and gallic acid which had greater antioxidant activity based on all methods, especially for 2,2‐Diphenyl‐2‐picrlhydrazyl radical‐scavenging assay (DPPH) and had a similar antioxidant activity to 6PPD. The antioxidants were applied in NR vulcanizates at 1 phr and 2 phr to study their physical and mechanical properties. The decomposition temperature of RE was higher than for 6PPD but similar to TMQ. The ...
Tensile Behavior after Oxidative Aging of Gum and Black-Filled Vulcanizates of SBR and NR
Rubber Chemistry and Technology, 1999
Typical sulfur-cured vulcanizates of styrene-butadiene rubber (SBR) and natural rubber (NR) were prepared, and subjected to air-oven aging at 100 °C. Gum specimens exhibited an initial aging period in which stiffness was unchanged, while tensile strength and strain-to-break were significantly reduced. In contrast, black-filled vulcanizates stiffened during early aging. After intermediate aging times, NR specimens softened, while SBR stiffened. With prolonged aging, all compositions became hard and inextensible.