Effect of norbornyl modified soybean oil on CB‐filled chloroprene rubber

Abstract

Carbon black (CB)‐filled chloroprene rubber (CR) compounds and vulcanizates containing naphthenic oil (NO), soybean oil (SO), and two different levels of norbornyl modified soybean oil (MSO) were prepared and investigated. The MSO was prepared through the reaction of SO and dicyclopentadiene (DCPD) at different ratios. Various properties including gel fraction, crosslink density, bound rubber fraction, curing behavior, thermal, mechanical, and aging properties of CB‐filled CR containing different oils were compared. It was observed that the addition of SO and MSO could benefit the dispersion of the filler, lower the glass transition temperature, and increase the thermal stability of the CB‐filled CR/MSO compounds and vulcanizates, and also slightly decrease the crosslink density of the CB‐filled CR/MSO vulcanizates compared to that of the CR/NO vulcanizate. With the increase of the modification level of the MSO, the curing time of the CB‐filled CR/MSO compounds was found to be decreased, the tensile property, tear strength, abrasion resistance, and aging resistance of the CB‐filled CR/MSO vulcanizates were improved compared with those of the CB‐filled CR/NO vulcanizate. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016, 133, 43809.

Norbornylized soybean oil as a sustainable new plasticizer for rubbers with hybrid fillers

“…As a consequence, the use of NSO can improve aging resistance over NO and also SO in SBR. A similar effect was also seen in the previous study …”

“…With an increase of norbornylization level, the tear strength of hybrid‐filler‐filled SBR/NSO vulcanizates is increased. A similar effect was observed and discussed in our previous study . The increase in tear strength is related to a lower crosslink density and more polysulfidic crosslinks …”

“…SO and NSO are more thermally stable than the NO; thus the SBR compounds and vulcanizates containing SO and NSO exhibit similar and excellent thermal stability. A similar effect was also seen in previous studies . The use of SO and NSO can tremendously enhance processing safety.…”

Sustainable plasticizer for butyl rubber cured by phenolic resin

“…Since SO and NSO can be used in different rubber compounds to replace petroleum‐based plasticizers, it is desirable to explore the effect of SO and NSO in IIR compounds in comparison with NO. Our previous studies showed that SO and NSO react with various rubber additives in sulfur and metal oxide curing systems . The behavior of SO and NSO in phenolic resin curing system is unknown.…”

“…The carbon–carbon double bonds on the norbornyl groups showed higher reactivity than those on the fatty acid chains . It was shown that NSO in rubbers, such as SBR and CR compounds, reacts with rubber additives, providing desired overall performance for rubbers, such as improved thermal stability and mechanical properties …”