Hydrogenated natural rubber blends: Aspect on thermal stability and oxidative behavior

Abstract

Hydrogenated natural rubber (HNR) prepared from natural rubber (NR) is a new sustainable elastomer with excellent thermal properties. This study reports on the effect of vulcanization system and blend ratio on the thermal and oxidative resistance of HNR/NR vulcanizates. The various HNR/NR ratios vulcanized by peroxide and sulfur donor system exhibited the highest retention of tensile strength after thermal aging due to the formation of zinc-dimethyldithiocarbamate (ZDMDC) which is an efficient antioxidant. The results from thermogravimetric analysis (TGA) indicated that the saturated structure of HNR had higher decomposition temperature and activation energy to enhance the thermal stability of HNR/NR vulcanizates. The initial and maximum decomposition temperatures of NR and HNR phases in vulcanizates were not affected by rubber blend ratio. This suggests that the decomposition pattern of HNR has no influence on another constituent. The increase in HNR content in the blends could retard the ozonolysis resulting in the surface cracking attacked by ozone.

Preparation of poly(methyl methacrylate)‐Silica nanoparticles via differential microemulsion polymerization and physical properties of NR/PMMA‐SiO2 hybrid membranes

“…), the main thermal decomposition of NR matrix (C‐C chain bonds rupture and hydrogen transfer) was observed. Moreover, the degradation curves of NR/PMMA‐SiO 2 samples are slightly shifted to a higher temperature with the addition of PMMA‐SiO 2 into the NR latex because of the intertwining between one PMMA chain on the silica surface and another PMMA chain on a NR molecule .…”

Synthesis of polybutadiene-silica nanoparticles via differential microemulsion polymerization and their hydrogenated nanoparticles by diimide reduction

“…10b) showed two peaks at a temperature around 393 C and 480 C, respectively. Thus, a two-step decomposition of the composite occurred for NR/ HPB-SiO 2 due to the effect of HPB-SiO 2 filled in NR [32]. The T g of the unfilled NR, NR/PB-SiO 2 and NR/HPB-SiO 2 composites at various blend ratios are presented in Table 2.…”

Poly(styrene)‐ and Poly(styrene‐co‐methyl methacrylate)‐graft‐hydrogenated natural rubber latex: Aspect on synthesis, properties, and compatibility

“…The DTG curve of the thermal decomposition of NR showed the major peak of the maximum weight loss rate at T p of 360 C. Whereas, the DTG curve of HNR exhibited two main loss processes in the range of 300-420 C and 420-475 C for the thermal decomposition of the unsaturated core and the saturated layer, respectively, in the HNR particle (see Fig. 3b) [27]. The obvious T p value of HNR appeared at the first peak of 382 C and it was higher than that of NR for 22 C, which was possibly induced by the saturated part in the HNR structure.…”