کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10608615 | 984223 | 2005 | 7 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermotropic polyesters. 2: Synthesis, characterization and thermal transitions of copolyesters containing 4,4â²-bis (Ï-alkyloxy) biphenyl isophthalate units
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
شیمی
شیمی آلی
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چکیده انگلیسی
Thermotropic copolyesters containing an isophthalate unit and mesogenic 4, 4â²-bis (Ï-hydroxyalkyloxy) biphenyls (n = 3, 4, 6) with different numbers of methylene units have been synthesized by melt polymerization. The number-average molar mass (Mn) was estimated from end group analysis by 1H NMR. The copolymer compositions were also obtained from 1H NMR. The thermal behavior of the copolymers containing even-even (n = 4, 6) and odd-even (n = 3, 4) pairings has been investigated and is also compared with that of the analogous homopolymers. The copolymers exhibit reduced melting point and extending liquid crystalline range identified using polarizing microscopy and DSC. All of the obtained compounds were characterized by conventional spectroscopic methods.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: European Polymer Journal - Volume 41, Issue 3, March 2005, Pages 611-617
Journal: European Polymer Journal - Volume 41, Issue 3, March 2005, Pages 611-617
نویسندگان
Massoumeh Bagheri, Khadije Didehban, Ali Akbar Entezami,