Non-isothermal Cry stallizatio n Kinetics Study of Biodegradable Polyethylene Azelate/SiO۲ Nanocompo site

The rapid development of polymers, p olymer-based nanocomposites an d their wi de applications are obviously one of the characteristics of the last cen tury. However, the wi de applications of these materials also result in an irreversible buildup of polymer waste in t he environm ent. Therefore, synthe sis and m odification of the biodegradable polymers an d polymer- based nanocomposites through in novative technology is an impressive task from the view point of materials science [۱]. A re newed inter est in aliphatic polyesters has resulte d in develo ping materials importa nt in differe nt industrial applications, e.g. the biomedical an d ecologic al fields. Mechanical properties and degradation rates of biodegradable aliphatic polyester s depend strongly on their chemical structures, but th ey also depend on their morphol ogy and crystalline structures which in turn are determined directly by the thermal treatment imposed o n the poly mers during solidification process [۲]. Therefo re, it is very important to investi gate the crystallization kinetics and morphology of these biodegradable aliphatic polyesters, to understand the relationship between structural features an d crystalliz ation conditions. Ho wever, over the last few years, the studies show that biodegradability of polymer-bas ed nanocomposites is fa ster than pure polymers.In this work, polyeth ylene azela te/silica (PEA/SiO۲) nan ocomposites containing ۳ wt.% Si O۲ were prepared via in situ polyme rization method. The n on-isotherm al crystalliza tion behavior of PEA/S iO۲ nanocomposites has been studied by the A vrami equation.

کلیدواژه ها:

Nanocom posite ، Crystallization Kinetics ، Av rami ، PEA