The Blending of EPDM/NR with Maleic Anhydride as Compatibilizer: Comparing the Effect of Accelerators on Cure Characteristic and Mechanical Properties

Abstract

The blending of ethylene propylene diene monomer/natural rubber (EPDM/NR) needs much attention because of their incompatibility. In this work, the influence of accelerator type on cure characteristics and mechanical properties of 60/40 EPDM/NR blend was investigated. The compounds were prepared by controlling the migration of curative and using maleic anhydride as the compatibilizer. Three types of accelerators were studied: 2,2-dithiobis(benzothiazole) (MBTS), the combination of MBTS and tetramethyl thiuram disulfide (TMTD), and n-tert-butyl-2-benzothiazolesulfenamide (TBBS). The cure characteristic, mechanical properties, and morphology of the composites had been investigated by rheometer, tensile testing machine, hardness durometer and scanning electron microscope (SEM). Blending of EPDM/NR with various accelerator gave different composite characteristics. MBTS, used in single or binary accelerator system, provided good mechanical properties. TBBS gave the longest scorch time, the lowest crosslink density and poor mechanical properties, except tear strength. Binary accelerator, MBTS/TMTD, provided the lowest processing time and the highest cure rate, but not significantly different from MBTS. Binary accelerator gives the best aging resistance and compatibility blend. These results correspond well with SEM micrograph. From the study, it can be concluded that binary accelerator system was the proper accelerator for EPDM/NR blend.

Influence of LLDPE-g-MA on Mechanical Properties, Degradation Performance and Water Absorption of Thermoplastic Sago Starch Blends

“…Compatibility has also been associated with the increase in flexibility or decrease in stiffness, as the compatibilizer acts as a bridge between hydrophobic (LLDPE) and hydrophilic (TPSS) components [21][22]. However, under certain conditions, increasing the compatibilizer's concentration may weaken the mixture's mechanical properties.…”

Ketahanan Termal dan Ketahanan Perendaman Komposit NBR/EPDM dengan Berbagai Kompatibiliser

“…EPDM memiliki ketahanan yang baik terhadap ozon dan panas, namun kurang tahan terhadap minyak dan oli [1,2] . Pembuatan komposit dari NBR/EPDM dapat meningkatkan sifat unggul dari kedua material tersebut [3] .…”

Pengaruh Jenis Bahan Pengisi Terhadap Karakteristik Pematangan Kompon Kloroprena/ Karet Alam

“…Proses pematangan ini merupakan proses terbentuknya ikatan silangan taramatriks karet dengan bahan pemvulkanisasinya. Ikatan silang akan semakin meningkat dengan bertambahnya waktu, hingga waktu optimum pemasakan tercapai [14] .…”

“…Dari Tabel 2 diketahui bahwa kenaikan suhu memberikan kenaikan nilai CRI. Kenaikan suhu membuat molekul dalam matriks karet semakin cepat bertumbukan, sehingga reaksinya berjalan lebih cepat [14][15] . Bahan pengisi CB memberikan indeks kecepatan pematangan yang paling tinggi, kemudian kombinasi bahan pengisi CB dan kaolin.…”