Effect of different types of peroxides on rheological, mechanical, and morphological properties of thermoplastic vulcanizates based on natural rubber/polypropylene blends

Thitithammawong, Anoma; Nakason, Charoen; Sahakaro, Kannika; Noordermeer, Jacobus W.M.

doi:10.1016/j.polymertesting.2007.02.002

Cited by 74 publications

(55 citation statements)

References 17 publications

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“…Apart from raw NR, the modified form of NR has also been used to prepare the TPNRs. Epoxidized natural rubber (ENR) is one of the most frequent used modified NR by blending with various types of thermoplastics 1–4. This is because ENR exhibits various excellent properties that include oil resistance, gas impermeability, good wet grip, and high damping characteristics.…”

Section: Introductionmentioning

confidence: 99%

Thermoplastic natural rubber based on polyamide‐12: Influence of blending technique and type of rubber on temperature scanning stress relaxation and other related properties

Narathichat¹,

Kummerlöwe²,

Vennemann³

et al. 2011

J of Applied Polymer Sci

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Thermoplastic natural rubber based on polyamide-12 (PA-12) blend was prepared by melt blending technique. Influence of blending techniques (i.e., simple blend and dynamic vulcanization) and types of natural rubber (i.e., unmodified natural rubber (NR) and epoxidized natural rubber (ENR)) on properties of the blends were investigated. It was found that the simple blends with the proportion of rubber $ 60 wt % exhibited cocontinuous phase structure while the dynamically cured blends showed dispersed morphology. Furthermore, the blend of ENR exhibited superior mechanical properties, stress relaxation behavior, and fine grain morphology than those of the blend of the unmodified NR. This is attributed to chemical interaction between oxirane groups in ENR molecules and polar functional groups in PA-12 molecules which caused higher interfacial adhesion. It was also found that the dynamic vulcanization caused enhancement of strength and hardness properties. Temperature scanning stress relaxation measurement revealed improvement of stress relaxation properties and thermal resistance of the dynamically cured ENR/PA-12 blend. This is attributed to synergistic effects of dynamic vulcanization of ENR and chemical reaction of the ENR and PA-12 molecules. Furthermore, the dynamically cured ENR/PA-12 blend exhibited smaller rubber particles dispersed in the PA-12 matrix.

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Section: Introductionmentioning

confidence: 99%

Thermoplastic natural rubber based on polyamide‐12: Influence of blending technique and type of rubber on temperature scanning stress relaxation and other related properties

Narathichat¹,

Kummerlöwe²,

Vennemann³

et al. 2011

J of Applied Polymer Sci

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“…This technique has been employed in the development of several TPVs. Most of them are constituted by polypropylene as the thermoplastic component and different vulcanized rubbers dispersed in the polypropylene matrix, such as ethylene-propylene-diene rubber (EPDM) [14][15][16], nitrile rubber [17][18][19][20][21] and natural rubber [22,23], among others. However, to the best of our knowledge, there is no report in the accessible literature dealing with blends constituted by polypropylene and acrylic rubber.…”

Section: Introductionmentioning

confidence: 99%

A novel thermoplastic elastomer based on dynamically vulcanized polypropylene/acrylic rubber blends

Soares

Santos²,

Sirqueira³

2008

Express Polym. Lett.

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Abstract. Thermoplastic elastomer based on polypropylene (PP) and acrylic rubber (ACM) was investigated, with special attention on the compatibilization and dynamic vulcanization. ACM component contains chlorine and carboxyl groups along the backbone, which act as center for the curing and reactive compatibilization. The last event was carried out by adding a combination of maleic anhydride-modified PP (PP-g-MA) and triethylene tetramine (TETA), which act as interfacial agents between PP and ACM phases. The effectiveness of the compatibilization was suggested from mixing torque and viscosity, determined from rheological measurements. Outstanding mechanical performance, especially elongation at break, and better tensile set (lower values) were obtained with the compatibilization. The dynamic vulcanization also resulted in good mechanical properties for compatibilized blends, but the performance was inferior to that observed for non vulcanized blends. The effect of the compatibilization and/or dynamic vulcanization on the dynamic mechanical, thermal, morphological and stress relaxation properties was investigated.

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“…These reactions usually occur on the tertiary carbon of polypropylene structural units of EPDM. In the presence of peroxide radicals at high temperature, polypropylene units can be degraded trough β chain-scission (Scheme 2) [20]. In this manner, macromolecular chains easily undergo cleavage reactions to form polymer chains with lower molecular weight.…”

Section: Resultsmentioning

confidence: 99%

Influence of mixed sulfur/peroxide curing system and thermo-oxidative ageing on the properties of rubber magnetic composites

2014

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The present work was focused on the study of preparation a evaluation of properties of rubber magnetic composites based ethylene propylene diene monomer rubber EPDM as elastomeric matrix and strontium ferrite as magnetic filler. The mixed peroxide and sulfur curing systems were applied for cross-linking of rubber compounds. The research was aimed at the evaluation of the type of curing system on curing process of rubber compounds. Then, the influence of the observed parameter on cross-link density and physical-mechanical properties of prepared composites was investigated. The influence of thermo-oxidative ageing on the properties of tested composite materials was also under consideration. The achieved results showed that tensile strength was not dependent on the type of curing system, while crosslink density and physical-mechanical properties were changed in dependence on mutual ratio of sulfur and peroxide in the applied curing systems. Ferrite seems to act as a reinforcing filler in composites cured mainly with peroxide system, in which co-agent contributes to the improvement of compatibility and adhesion on the phase interface filler-rubber. The thermo-oxidative stability of composites was also found to be influenced by the curing system composition.

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Effect of different types of peroxides on rheological, mechanical, and morphological properties of thermoplastic vulcanizates based on natural rubber/polypropylene blends

Cited by 74 publications

References 17 publications

Thermoplastic natural rubber based on polyamide‐12: Influence of blending technique and type of rubber on temperature scanning stress relaxation and other related properties

Thermoplastic natural rubber based on polyamide‐12: Influence of blending technique and type of rubber on temperature scanning stress relaxation and other related properties

A novel thermoplastic elastomer based on dynamically vulcanized polypropylene/acrylic rubber blends

Influence of mixed sulfur/peroxide curing system and thermo-oxidative ageing on the properties of rubber magnetic composites

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