کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
5182507 1380991 2013 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-performance copolyimide fibers containing quinazolinone moiety: Preparation, structure and properties
ترجمه فارسی عنوان
الیاف کپلیلیید با عملکرد بالا حاوی قطعات کوینازولینون: آماده سازی، ساختار و خواص
موضوعات مرتبط
مهندسی و علوم پایه شیمی شیمی آلی
چکیده انگلیسی

Copolyimide (co-PI) fibers with superior mechanical properties and high thermal stability were developed via a two-step polymerization/imidization process based on a new design of introducing an aromatic heterocyclic diamine monomer, 2-(4-aminophenyl)-6-amino-4(3H)-quinazolinone (AAQ) into rigid homopolyimide backbones of 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA) and p-phenylenediamine (p-PDA). Effects of the incorporated AAQ moieties on the micro-structure and properties of the prepared fibers were investigated. Fourier transform infrared (FTIR) results indicated that hydrogen bonding is formed between the AAQ and cyclic imide units that effectively strengthens the intermolecular interactions. This has been considered to be the key factor responsible for the significantly enhanced mechanical properties of the co-PI fibers. Two-dimensional wide angle X-ray diffraction (2D WAXD) spectra showed that the co-PI fibers are highly oriented with well-ordered 2D structures along both the fiber and transverse directions. The co-PI fibers reached the optimum tensile strength and modulus of 2.8 GPa and 115 GPa, respectively, at the AAQ/p-PDA molar ratio of 5/5. The fiber also exhibited high thermal stability, with a 5%-weight-loss temperature of 599 °C under N2 and 564 °C in air.

Highlights► High-performance copolyimide fibers containing quinazolinone moiety were prepared. ► Fibers' tensile strength and modulus can reach 2.8 GPa and 115 GPa, respectively. ► Effects of the AAQ on the fibers' microstructure and properties were studied. ► Fibers' properties can be improved by hydrogen bonding interactions significantly. ► The copolyimide fibers are highly oriented with mesophase-like ordered structures.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Polymer - Volume 54, Issue 6, 8 March 2013, Pages 1700-1708
نویسندگان
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