Relationships Between Mixing Method, Microstructure and Strength of Nr:Br Blends
| Autor: | B. Clarke, Philip K. Freakley, Jane Clarke |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Tear resistance
Materials science Polymers and Plastics Microstructure chemistry.chemical_compound Natural rubber chemistry visual_art Compatibility (mechanics) Ultimate tensile strength Masterbatch Materials Chemistry visual_art.visual_art_medium Composite material Phase morphology Rule of mixtures |
| Zdroj: | Rubber Chemistry and Technology. 74:1-15 |
| ISSN: | 1943-4804 0035-9475 |
| DOI: | 10.5254/1.3547636 |
| Popis: | Much published literature on the way in which phase morphology and filler distribution affect blend properties is contradictory or confusing. Experiments were carried out to elucidate the relationships and to determine whether the use of compatibilizers or special mixing techniques might have a beneficial effect on natural rubber:butadiene rubber (NR:BR) blend properties. NR:BR blends were prepared using both a masterbatch method and a single-stage mixing method. A cure system which gave an even distribution of crosslinks between the phases was used. The morphology, tensile strength and tear strength properties of the blends were measured. Results indicated a high degree of compatibility with fine textured blends (domain sizes < 1µm) being quickly and easily produced, even from masterbatches of very different viscosities. Strength properties of these fine textured masterbatch blends could be predicted by applying the simple rule of mixtures to properties of individual compounds mixed under the same conditions. Although in particular situations a coarse morphology could result in high tear resistance values, for most applications a fine textured morphology gives the most satisfactory overall tensile and tear strength properties. For blends mixed in a single-stage process, development of a fine textured morphology was much quicker than that of filler dispersion. For NR:BR blends containing an optimum cure system it was concluded that the mixing cycle should be chosen to optimize filler dispersion and that use of a compatibilizer will not significantly shorten the mixing cycle or improve the properties of the blend. |
| Databáze: | OpenAIRE |
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