Avaliação do processo de cura da borracha nitrílica (NBR) pela resina fenólica através do cálculo da constante de cura

Abstract

O processo de cura envolve reações de múltiplos mecanismos e sua investigação pode ser feita por meio de várias técnicas. Este trabalho apresenta a comparação entre dois métodos que utilizam parâmetros reométricos para o cálculo da constante cinética de cura (k) relacionada com a cura da borracha nitrílica com a resina fenólica, tendo o policloropreno e o óxido de zinco como sistema ativador. Foi utilizado o planejamento de experimentos fatorial completo (2³ + ponto central) como base para a preparação das formulações e análise dos resultados. Os resultados obtidos identificaram a influência da temperatura, da quantidade de cada um dos componentes das formulações e da adequação dos métodos de avaliação para o processo de cura da borracha nitrílica pela resina fenólica.

Introduction to the Study of Mechanical Properties of Terpolymer PP/EPDM Mixtures

“…In addition, TPEs produce lighter parts, with production cycles shorter and faster. They are processed by the same equipment used in traditional thermoplastics, on contrary of vulcanized rubbers [2,3].…”

“…The development of these materials leads to a new and special type of industry, the thermoplastics industry (TPEs) [7]. TPE-Vs Polypropylene (PP) base and ethylenepropylene-diene (EPDM) copolymer represent the most representative of this class of materials [8,9]. They are used specially in auto industry for the manufacturing of parts as profiles, hoses and bumpers, pointing to other segments with use in various products as toothbrushes, tools and cable insulation [10,11].…”

Comparative study among TMTD, TBzTD, and ZBEC accelerators in isobutylene‐isoprene elastomer vulcanization

“…The elastomers subjected to the vulcanization process with sulfur exhibit physical, mechanical, and chemical changes due to the modification of its plastic state to the elastic state resulting from the formation of crosslinks between the polymer chains . In addition, the vulcanization kinetics may be altered by the use of accelerators, which are intended to improve the efficiency of crosslinks that occur during the vulcanization step .…”

Vulcanization Kinetic Study of Different Nitrile Rubber (NBR) Compounds

“…In rubber industry, when non‐sulfur chemicals are used, this process generally is called curing. On the other hand, when sulfur chemicals are used, the process is often called vulcanization …”