سال انتشار: ۱۳۹۰

محل انتشار: کنفرانس بین المللی فرآورش پلیمرها

تعداد صفحات: ۵

نویسنده(ها):

Ebrahim Ahmadi – aPolymer Synthesis Laboratory, Chemistry Department, Zanjan University
Ahmad Salehi Rozveh – bSaba Tire Cord MFG. Complex, P.O. Box 45161-34941, Zanjan, Iran
Fatemeh Saghatchi – aPolymer Synthesis Laboratory, Chemistry Department, Zanjan University

چکیده:

A research has been undertaken to determine the effect of melt temperature on the thermal properties of nylon 6-6. UV spectroscopy and TGA showed that nylon 6-6 is the least stable above the commercial processing temperatures of the polymer and can lead to changes in the degree of polymerization. Also the rheological behavior of polyamide 6-6 samples with different initial moisture levels is investigated. For this reason nylon chips with several water content were used to determine its effect on the melt molecular weight of nylon. Investigations indicate that water content has a strong effect on the rheological properties of nylons. If the amount of water is less than that prescribed by the thermodynamic equilibrium constant, the reaction proceeds toward further condensation, and the molecular weight increases. If the amount of water is more than the equilibrium value, the reaction goes in the direction of hydrolysis, consequently the molecular weight decreases