NDLI: Fabrication and characterization of co-polyimide fibers containing pyrimidine units

Content Provider	Springer Nature Link
Author	Gan, Feng Dong, Jie Tan, Wenjun Zhang, Dianbo Zhao, Xin Chen, Xingyu Zhang, Qinghua
Copyright Year	2017
Abstract	A series of co-polyimides (co-PIs) containing pyrimidine rings were synthesized by reacting the self-synthesized diamine 2,5-bis(4-aminophenyl)-pyrimidine (PRM) with commercial 4,4’-diaminodiphenyl ether (ODA) and aromatic 3,3′,4,4′-biphenyltetracarboxylic dianhydride (BPDA). A series of co-PI fibers were produced using a two-step wet-spinning method, including extrusion, coagulation, washing, drying, thermal imidization and hot-drawing processes. Orientation structures of the precursor co-PAA fibers formed in the wet-spinning process, and their effects on the thermomechanical properties of the as-spun co-PI fibers were discussed. An interesting phenomenon has been found that glass transition temperatures (T $_{g}$s) of as-spun co-PI fibers decreased with increasing orientation factors, which was explained based on some previous works. Two-dimensional wide-angle X-ray diffraction spectra of the final co-PI fibers showed that samples with higher PRM contents show highly oriented and well-ordered crystalline structures, which account for the enhanced mechanical properties when incorporating PRM moieties. The co-PI fiber with the PRM/ODA molar ratio of 6/4 showed an optimum tensile strength and modulus of 3.1 and 90 GPa, respectively, showing a great potential in light advanced composites.
Starting Page	9895
Ending Page	9906
Page Count	12
File Format	PDF
ISSN	00222461
Journal	Journal of Materials Science
Volume Number	52
Issue Number	16
e-ISSN	15734803
Language	English
Publisher	Springer US
Publisher Date	2017-04-25
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Materials Science Characterization and Evaluation of Materials Polymer Sciences Continuum Mechanics and Mechanics of Materials Crystallography and Scattering Methods Classical Mechanics
Content Type	Text
Resource Type	Article
Subject	Ceramics and Composites Mechanics of Materials Mechanical Engineering Polymers and Plastics

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