Clarifying the Effect of Drafting Conditions on Structure and Properties of Polyimide Fibers at Molecular Dynamic Level

2022 ◽  
pp. 2100081
Author(s):  
Daolei Lin ◽  
Ming Jiang ◽  
Runyue Li ◽  
Shengli Qi ◽  
Dezhen Wu
Keyword(s):  
Molecular Dynamic ◽  
Structure And Properties ◽  
Polyimide Fibers ◽  
Dynamic Level

Structure and properties of polyimide fibers containing benzimidazole and Amide Units

2014 ◽  
Vol 53 (3) ◽  
pp. 183-191 ◽  
Author(s):  
Chaoqing Yin ◽  
Jie Dong ◽  
Zixin Zhang ◽  
Qinghua Zhang ◽  
Jinyou Lin
Keyword(s):  
Structure And Properties ◽  
Polyimide Fibers

Preparation of R-BABP Polyimide Fibers via Wet Spinning of Polyamide Acid

2020 ◽  
Vol 869 ◽  
pp. 266-272
Author(s):  
Gleb Vaganov ◽  
Andrei Didenko ◽  
Elena Ivan’kova ◽  
Elena Popova ◽  
Vladimir Elokhovskii ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Ethylene Glycol ◽  
Coagulation Bath ◽  
Wet Spinning ◽  
Structure And Properties ◽  
Polyimide Fibers ◽  
Thermal Imidization ◽  
Morphology And Mechanical Properties

A polyamide acid (PAA) based on diamine 4,4'-bis (4-aminophenoxy) diphenyl and 1,3-bis (3',4-dicarboxyphenoxy) benzene dianhydride was synthesized. PAA fibers were obtained by wet spinning. Then, these fibers were converted into polyimide by thermal imidization. Dependence of the structure and properties of fibers on the die drawing and the composition of the coagulation bath was studied. It is shown that the composition of the coagulation bath has a significant effect on the morphology and mechanical properties of polyimide (PI) fibers. To obtain defect-free fibers, a coagulation bath consisting of ethylene glycol/ethanol at 50/50 vol. % was found to be optimal. An increase in the die drawing of fibers from 1 to 2 times leads to an increase in tensile strength and strain at break of the polyimide fibers.

Structure and properties of novel PMDA/ODA/PABZ polyimide fibers

2008 ◽  
Vol 48 (5) ◽  
pp. 912-917 ◽  
Author(s):  
Guanqun Gao ◽  
Liang Dong ◽  
Xiangyang Liu ◽  
Guangdou Ye ◽  
Yi Gu
Keyword(s):  
Structure And Properties ◽  
Polyimide Fibers

Structure and properties of polyimide (BTDA-TDI/MDI co-polyimide) fibers obtained by wet-spinning

2011 ◽  
Vol 19 (7) ◽  
pp. 645-653 ◽  
Author(s):  
Hong Bing Xiang ◽  
Zhong Huang ◽  
Li Qi Liu ◽  
Lei Chen ◽  
Jing Zhu ◽  
...  
Keyword(s):  
Wet Spinning ◽  
Structure And Properties ◽  
Polyimide Fibers

Structure and properties of melt-extruded laRC-IA (3,4?-ODA 4,4?-ODPA) polyimide fibers

1999 ◽  
Vol 73 (7) ◽  
pp. 1215-1222 ◽  
Author(s):  
K. D. Dorsey ◽  
P. Desai ◽  
A. S. Abhiraman ◽  
J. A. Hinkley ◽  
T. L. St. Clair
Keyword(s):  
Structure And Properties ◽  
Polyimide Fibers

Structure and Properties of Aromatic Polyimide Fibers Fabricated by a Novel “Reaction-Spinning” Method

2019 ◽  
Vol 28 (1) ◽  
pp. 1-4 ◽  
Author(s):  
Zhentao Li ◽  
Jie Dong ◽  
Jian Huang ◽  
Tao Guo ◽  
Shihua Wang ◽  
...  
Keyword(s):  
Structure And Properties ◽  
Aromatic Polyimide ◽  
Polyimide Fibers

Structure of second phases in TiAl alloys containing Cr and B

1991 ◽  
Vol 49 ◽  
pp. 576-577
Author(s):  
Ernest L. Hall ◽  
Shyh-Chin Huang
Keyword(s):  
Grain Size ◽  
Second Phase ◽  
Structure And Properties ◽  
Tial Alloys ◽  
Second Phases ◽  
Interstitial Elements

Addition of interstitial elements to γ-TiAl alloys is currently being explored as a method for improving the properties of these alloys. Previous work in which a number of interstitial elements were studied showed that boron was particularly effective in refining the grain size in castings, and led to enhanced strength while maintaining reasonable ductility. Other investigators have shown that B in γ-TiAl alloys tends to promote the formation of TiB2 as a second phase. In this study, the microstructure of Bcontaining TiAl alloys was examined in detail in order to describe the mechanism by which B alters the structure and properties of these alloys.

Relationships between hierarchical structure and properties in macromolecular systems

1987 ◽  
Vol 45 ◽  
pp. 440-443
Author(s):  
E. Baer
Keyword(s):  
Uniaxial Tension ◽  
Hierarchical Structure ◽  
Inorganic Material ◽  
Hierarchical Structures ◽  
Bone Collagen ◽  
Structure And Properties ◽  
Connective Tissues ◽  
Scale Level ◽  
Fibrous Protein ◽  
Macromolecular Systems

The most advanced macromolecular materials are found in plants and animals, and certainly the connective tissues in mammals are amongst the most advanced macromolecular composites known to mankind. The efficient use of collagen, a fibrous protein, in the design of both soft and hard connective tissues is worthy of comment. Very crudely, in bone collagen serves as a highly efficient binder for the inorganic hydroxyappatite which stiffens the structure. The interactions between the organic fiber of collagen and the inorganic material seem to occur at the nano (scale) level of organization. Epitatic crystallization of the inorganic phase on the fibers has been reported to give a highly anisotropic, stress responsive, structure. Soft connective tissues also have sophisticated oriented hierarchical structures. The collagen fibers are “glued” together by a highly hydrated gel-like proteoglycan matrix. One of the simplest structures of this type is tendon which functions primarily in uniaxial tension as a reinforced elastomeric cable between muscle and bone.

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