A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior
A study of the thermal behavior of cured elastomeric blends of natural rubber (NR) and styrene butadiene rubber (SBR) prepared by solution blending in toluene is presented. Binary blends with different compositions of NR/SBR were produced using a conventional cure system based on sulfur and TBBS (n-...
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todo:paper_00218995_v125_n2_p992_Mansilla2023-10-03T14:22:27Z A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior Mansilla, M.A. Silva, L. Salgueiro, W. Marzocca, A.J. Somoza, A. blends crosslinking differential scanning calorimetry (DSC) glass transition Binary blends blends Butadiene rubber Chain structure Cross-link densities Cu-Re system Cure state Cured blends differential scanning calorimetry (DSC) Elastomeric blends Glass transition behavior Mechanical mixing Network structures Physical mixtures Single-value Solution blending Styrene butadiene rubber Swelling test Thermal behaviors Blending Crosslinking Curing Differential scanning calorimetry Styrene Sulfur Sulfur compounds Toluene Glass transition A study of the thermal behavior of cured elastomeric blends of natural rubber (NR) and styrene butadiene rubber (SBR) prepared by solution blending in toluene is presented. Binary blends with different compositions of NR/SBR were produced using a conventional cure system based on sulfur and TBBS (n-t-butyl-2-benzothiazole sulfonamide as accelerator. The compounds were vulcanized at 433 K up to an optimum time of cure determined by rheometric tests. From swelling tests, the crosslink densities of the compounds were obtained and compared with those obtained in similar blends prepared by mechanical mixing. The results were analyzed in terms of the disentangling of the chain structures of the SBR and NR phases and the achieved cure state of the blend. Using differential scanning calorimetry, the glass transition temperature T g of each blend was measured. In most compounds, the value of T g corresponding to each phase of the blend was determined, but in some blends a single value of T g was obtained. The variation of T g with the composition and cure level in each phase was analyzed. On the other hand, a physical mixture of two equal parts of NR and SBR vulcanized was measured and the results were compared to those of the NR50/SBR50 cured blend. Besides, to analyze the influence of the network structure, pure NR and SBR unvulcanized samples were measured. On the basis of all the obtained results, the influence of the interphase formed in the blend between SBR and NR phases is discussed. Copyright © 2011 Wiley Periodicals, Inc. JOUR info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/2.5/ar http://hdl.handle.net/20.500.12110/paper_00218995_v125_n2_p992_Mansilla |
| institution |
Universidad de Buenos Aires |
| institution_str |
I-28 |
| repository_str |
R-134 |
| collection |
Biblioteca Digital - Facultad de Ciencias Exactas y Naturales (UBA) |
| topic |
blends crosslinking differential scanning calorimetry (DSC) glass transition Binary blends blends Butadiene rubber Chain structure Cross-link densities Cu-Re system Cure state Cured blends differential scanning calorimetry (DSC) Elastomeric blends Glass transition behavior Mechanical mixing Network structures Physical mixtures Single-value Solution blending Styrene butadiene rubber Swelling test Thermal behaviors Blending Crosslinking Curing Differential scanning calorimetry Styrene Sulfur Sulfur compounds Toluene Glass transition |
| spellingShingle |
blends crosslinking differential scanning calorimetry (DSC) glass transition Binary blends blends Butadiene rubber Chain structure Cross-link densities Cu-Re system Cure state Cured blends differential scanning calorimetry (DSC) Elastomeric blends Glass transition behavior Mechanical mixing Network structures Physical mixtures Single-value Solution blending Styrene butadiene rubber Swelling test Thermal behaviors Blending Crosslinking Curing Differential scanning calorimetry Styrene Sulfur Sulfur compounds Toluene Glass transition Mansilla, M.A. Silva, L. Salgueiro, W. Marzocca, A.J. Somoza, A. A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior |
| topic_facet |
blends crosslinking differential scanning calorimetry (DSC) glass transition Binary blends blends Butadiene rubber Chain structure Cross-link densities Cu-Re system Cure state Cured blends differential scanning calorimetry (DSC) Elastomeric blends Glass transition behavior Mechanical mixing Network structures Physical mixtures Single-value Solution blending Styrene butadiene rubber Swelling test Thermal behaviors Blending Crosslinking Curing Differential scanning calorimetry Styrene Sulfur Sulfur compounds Toluene Glass transition |
| description |
A study of the thermal behavior of cured elastomeric blends of natural rubber (NR) and styrene butadiene rubber (SBR) prepared by solution blending in toluene is presented. Binary blends with different compositions of NR/SBR were produced using a conventional cure system based on sulfur and TBBS (n-t-butyl-2-benzothiazole sulfonamide as accelerator. The compounds were vulcanized at 433 K up to an optimum time of cure determined by rheometric tests. From swelling tests, the crosslink densities of the compounds were obtained and compared with those obtained in similar blends prepared by mechanical mixing. The results were analyzed in terms of the disentangling of the chain structures of the SBR and NR phases and the achieved cure state of the blend. Using differential scanning calorimetry, the glass transition temperature T g of each blend was measured. In most compounds, the value of T g corresponding to each phase of the blend was determined, but in some blends a single value of T g was obtained. The variation of T g with the composition and cure level in each phase was analyzed. On the other hand, a physical mixture of two equal parts of NR and SBR vulcanized was measured and the results were compared to those of the NR50/SBR50 cured blend. Besides, to analyze the influence of the network structure, pure NR and SBR unvulcanized samples were measured. On the basis of all the obtained results, the influence of the interphase formed in the blend between SBR and NR phases is discussed. Copyright © 2011 Wiley Periodicals, Inc. |
| format |
JOUR |
| author |
Mansilla, M.A. Silva, L. Salgueiro, W. Marzocca, A.J. Somoza, A. |
| author_facet |
Mansilla, M.A. Silva, L. Salgueiro, W. Marzocca, A.J. Somoza, A. |
| author_sort |
Mansilla, M.A. |
| title |
A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior |
| title_short |
A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior |
| title_full |
A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior |
| title_fullStr |
A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior |
| title_full_unstemmed |
A study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior |
| title_sort |
study about the structure of vulcanized natural rubber/styrene butadiene rubber blends and the glass transition behavior |
| url |
http://hdl.handle.net/20.500.12110/paper_00218995_v125_n2_p992_Mansilla |
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