کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1403862 984852 2006 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of monomer structure and imidization degree on mechanical properties and viscoelastic behavior of thermoplastic polyimide films
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
پیش نمایش صفحه اول مقاله
Effects of monomer structure and imidization degree on mechanical properties and viscoelastic behavior of thermoplastic polyimide films
چکیده انگلیسی

Two thermoplastic polyimides based on a common diamine (3,4′-ODA) were synthesized using different dianhydrides, namely ODPA and BPDA by a two step method. Molecular weight was controlled by using PA as an end capping agent. Effects of imidization degree on the mechanical properties and viscoelastic behavior of thermoplastic polyimide films were investigated. Film samples with varying degrees of imidization were characterized using FTIR, DMTA and tensile properties testing. It was found that two polyimides have different rates of imidization because of difference in monomer reactivity and molecular structure. It was observed that with an increase in imidization degree there was a decrease in thermoplastic response and a change in viscoelastic behavior from liquid-like to solid-like. With increase in imidization degree the tensile modulus and tensile strength of the films were increased, whereas elongation at break and tensile breaking energy were found to decrease after a certain imidization temperature.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 42, Issue 8, August 2006, Pages 1844–1854
نویسندگان
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