A Study Of Aging Properties Of Uncured Nr/Br Blends: Using Tg-Dtg Technique

International Journal of Industrial Chemistry

دوره 2، شماره 4، اسفند 2011، صفحه 201-208

نوع مقاله: research article

نویسندگان

Saeed Taghvaei-Ganjali^{* 1، 2}؛ Fereshteh Motiee³

¹hemistry Department, Islamic Azad University, North Tehran Branch, Tehran, Iran

²Iran Rubber Research Institute, Tehran, Iran

³Chemistry Department, Islamic Azad University, North Tehran Branch, Tehran, Iran

چکیده

The changes in mechanical, rheological and thermal properties of NR/BR blends (60/40) after aging at different period of time were investigated. The prepared rubber blends were conditioned at a temperature of 23±2oC for up to 140 h in an aging box. The TG-DTG curves demonstrated two significant factors, DTmax (differences between maximum peak temperature of BR blend aged for 140 h with maximum peak temperature of BR blends aged for 27, 51, 75, 99 and 123 h) and peak height ratio (hNR/hBR). The correlation between rheological (TS2, TC90), mechanical (strain, modulus 100% and modulus 300%), and thermal parameters (DTmax, hNR/hBR) with aging time of NR/BR blends were studied. Parameters such as TC90, modulus 100%, modulus 300% and hNR/hBR showed a correlation with time of aging. Whereas, no significant correlation between TS2, strain and DTmax were found as the time of aging increased.

کلیدواژه‌ها

AGING TIME؛ NR/ BR؛ PHYSICO-MECHANICAL PROPERTIES؛ RHEOLOGY؛ TG-DTG