| Epoxidized natural rubber (ENR) with epoxide groups is a kind of polarrubber and possessing excellent gas barrier property. In addition, ENR hasstrong interaction with silicate and even can react with silica. Hence, twoaspects about epoxidized natural rubber were studied in this subject.(1) Effectof ENR50on the structure and properties of rectorite/styrene butadiene rubber(SBR) nanocomposites, especially on the gas barrier property.(2)Modification of silica with ENR50and its effect on the structure andproperties of silica/SSBR composites.Firstly, rectorite/ENR50nanocomposites were prepared by latexcompounding method, TEM results showed that rectorite dispersed innanometer scale. The stress at definite elongation increased with increase ofrectorite content while the tensile strength, tearing strength and gas barrierproperty showed no obvious increase.Secondly, effect of ENR50on the structure and properties ofrectorite/styrene butadiene rubber (SBR) nanocomposites, especially on the gas barrier property. Feasibility and basis of preparing rectorite/SBR/ENR50nanocomposites was that research on the properties of SBR/ENR50blendsshowed that SBR and ENR50can be co-vulcanized with sulfur vulcanizationsystem. Curing rate, tensile strength, tearing strength and gas barrier propertyof SBR increased with increasing ENR50content. Dynamic mechanicalthermal analyzer（DMTA）results showed that blending SBR and ENR50canobtain a two-phase structure, and this kind of structure also existed inrectorite/SBR/ENR50nanocomposites. TEM results of SBR/ENR50blendswithout fillers suggested that with increasing ENR50content, ENR50phaseturned from spherical and ellipsoidal shapes into elongated shapes and even aco-continuous structure can be obtained while ENR50content reached50phr.Therefore, nonlinear decrease of gas permeability of rectorite/SBR/ENR50nanocomposites is determined by ENR50content and phase structure. Inaddition, rectorite/SBR/ENR50nanocomposites with outstanding gas barrierproperty can be regarded as a promising material for producing the inner tubeor inner liner.Thirdly, modification effect of ENR50on rectorite/SBR nanocompositeswas compared with the interface agent of butadiene-styrene-vinyl pyridinerubber (VPR). VPR was often used to strengthen the interface bondingstrength between SBR and rectorite while preparing rectorite/SBRnanocomposites by latex compounding method. The research about the effectsof ENR50and VPR on the properties of rectorite/SBR nanocomposites showed that finer dispersion of rectorite can not been obtained by adding ENR50into rectorite/SBR nanocomposites, which is different from VPR. Inaddition, both ENR50and VPR can speed up curing rate and increase tensilestrength, the stress at definite elongation, hardness, tearing strength and gasbarrier property. And the above properties can be obviously increased byadding both ENR50and VPR into rectorite/SBR nanocomposites. DMTAresults showed that both ENR50and VPR can improve the storage modulusand loss modulus of rectorite/SBR nanocomposites.Finally, the reactions between ENR50, Si69and silica were studied. Theresults showed that the reaction between ENR50and silica was slower thanthat between Si69and silica. Then the properties of silica filled ENR25andENR25/50blends were studied. Compared with silica/SSBR composites,heat-treated silica/ENR25/ENR50composites had the best combinationperformance, such as higher mechanical peoperties, better cutting resistanceand wet skid resistance, comparative abrasion resistance except higher heatbulid-up. Properties of silica modified by10phr ENR50filled SSBRcomposites was compared with the effect of silica modified by Si69. Theresults showed that the stress at definite elongation of SSBR filled with silicamodified by ENR50and Si69was significant higher than SSBR filled withsilica modified by Si69. |
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