科研之友
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摘要
Nanocomposites based on ethylene-propylene-diene rubber (EPDM) and montmorillonite have been prepared via a melt process by using two vulcanization systems: a sulfur-accelerator system and a peroxide curing agent DBPH. The results of X-ray diffraction (XRD) and transmission electron microscopy (TEM) showed that, the rubber molecules were found to be intercalated into the galleries of the organophilic montmorillonite (OMMT), and the silicate layers were exfoliated and dispersed uniformly in the rubber matrix of the nanocomposite cured by the sulfur-accelerator system, but the silicate layers were stacked and existed in the form of intercalated structure in the nanocomposite cured by the peroxide agent DBPH. The exfoliated nanocomposites were was opaque and had better mechanical properties than the intercalated ones which were semi-transparent. The two kinds of curing systems had different curing behavior evaluated by the Flory-Rehner equation. The vulcanization time (t(90)) was prolonged, and the maximum-minimum torque (MH-ML) decreased with increasing of OMMT content, and the EPDM become less crosslinked in the presence of OMMT for nanocomposites cured by sulfur curing system. However, the corresponding values of the nanocomposite cured by peroxide agent DBPH did not change obviously with the OMMT content.
- 出版日期2004-4
- 单位上海交通大学
