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دانلود مقاله Two different methods of imidization for preparation of novel poly(esterدرimide)s فایل ورد (word) دارای 7 صفحه می باشد و دارای تنظیمات در microsoft word می باشد و آماده پرینت یا چاپ است

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توجه : در صورت  مشاهده  بهم ریختگی احتمالی در متون زیر ،دلیل ان کپی کردن این مطالب از داخل فایل ورد می باشد و در فایل اصلی دانلود مقاله Two different methods of imidization for preparation of novel poly(esterدرimide)s فایل ورد (word) ،به هیچ وجه بهم ریختگی وجود ندارد

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سال انتشار: 1385

محل انتشار: ششمین همایش ملی دانشجویی مهندسی شیمی و پنجمین همایش ملی دانشجویی مهندسی نفت

تعداد صفحات: 7

چکیده:

New naphthalene-ring containing ester diamines, as new monomers for the preparation of polyimides were
synthesized via two successive reactions. Nucleophilic reaction of 3,5-dinitrobenzoylchloride with 1-naphthol and 2-
naphthol in the presence of sodium hydroxide led to preparation of 1- and 2-(3,5-dinitrobenzoyloxy)naphthalene,
respectively. Next step was reduction of them byhydrazine hydrate/Pd-C to produce 1- and 2-(3,5-
diaminobenzoyloxy) naphthalene. All the prepared compounds were characterized by common spectroscopic
methods. These ester containing aromatic diamines with pendent naphthalene group were used to prepare soluble
polyimide copolymers via two different methods: catalyzed one-step high temperature polycondensation in m-cresol,
and two-step polycondensation in NMP and subsequent chemical dehydration. The obtained poly (ester-imide)s were
characterized and their properties were studied. One-step and two-step methods for the preparation of five-membered
ring polyimides were compared. Polymers prepared through one-step method showed higher yield and inherent
viscosities and therefore better physical properties.

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