High-Performance Copolymerized Poly(m-Phenylene Isophthalamide) (PMIA) Fibers Containing Ether Moiety: Preparation, Structure and Properties

2019 ◽  
Vol 960 ◽  
pp. 140-147
Author(s):  
Na Li ◽  
Xing Ke Zhang ◽  
Jun Rong Yu ◽  
Yan Wang ◽  
Jing Zhu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
High Performance ◽  
Molar Ratio ◽  
Wet Spinning ◽  
Structure And Properties ◽  
Dye Uptake ◽  
Excellent Thermal Stability ◽  
Polycondensation Process ◽  
Solution Polycondensation

Copolymerized poly (m-phenylene isophthalamide) (co-PMIA) fibers with excellent thermal stability and good mechanical properties were developed via solution polycondensation process based on m-phenylenediamine (MPD), isophthaloyl dichloride (IPC), and 3,4′-oxydianiline (3,4′-ODA). Effects of the ether moiety on the structure and properties of the copolymers were investigated. A series of co-PMIA nascent fibers were produced using wet-spinning method. The coagulation process to form co-PMIA nascent fibers were studied by examination of SEM and strength tester. The co-PMIA nascent fibers with the MPD/3,4′-ODA molar ratio of 8:2 showed an optimum dye uptake. Keywords: Copolymerization; High performance material; Wet spinning; Dyeability.

Morphology, Structure and Properties of Electrospun Multi-Walled Carbon Nanotube/Polysulfonamide Composite Nanofibers

2015 ◽  
Vol 10 (1) ◽  
pp. 155892501501000 ◽  
Author(s):  
Bin-Jie Xin ◽  
Wenjie Chen
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Composite Nanofibers ◽  
Electrospun Fibers ◽  
Structure And Properties ◽  
Excellent Thermal Stability ◽  
Multi Walled Carbon Nanotube ◽  
Composite Nanofiber ◽  
Multi Walled Carbon Nanotubes ◽  
Walled Carbon Nanotubes

In this paper, the morphology, structure and properties of electrospun Polysulfonamide (PSA)/multi-walled carbon nanotubes (MWCNTs) fibers are investigated systematically. The experimental results indicate that the diameter of electrospun PSA fiber increased by the blending of MWCNTs while its crystallinity decreased. Both the conductivity and mechanical properties of PSA/MWCNT fibers were improved by the blending of MWCNTs at a concentration below 5% MWCNT. The thermal behavior of the electrospun fibers was influenced by the MWCNT concentrations through the Thermogravimetric Analysis (TGA). The new developed PSA/MWCNTs composite nanofiber has excellent thermal stability and mechanical properties compared with the usual PSA fibers.

Facile method for fabricating low dielectric constant polyimide fibers with hyperbranched polysiloxane

2017 ◽  
Vol 5 (11) ◽  
pp. 2818-2825 ◽  
Author(s):  
Jie Dong ◽  
Cairan Yang ◽  
Yang Cheng ◽  
Tingting Wu ◽  
Xin Zhao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Dielectric Constant ◽  
High Performance ◽  
Low Dielectric Constant ◽  
Excellent Thermal Stability ◽  
Low Dielectric ◽  
Polyimide Fibers ◽  
Hyperbranched Polysiloxane ◽  
Radar Wave

High-performance fibers with a low dielectric constant and good mechanical properties as well as excellent thermal stability are in demand for the next generation of advanced radar-wave-transparent composites.

Semi-bio-based aromatic polyamides from 2,5-furandicarboxylic acid: toward high-performance polymers from renewable resources

RSC Advances ◽  
2016 ◽  
Vol 6 (90) ◽  
pp. 87013-87020 ◽  
Author(s):  
Kaiju Luo ◽  
Yan Wang ◽  
Junrong Yu ◽  
Jing Zhu ◽  
Zuming Hu
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Molecular Weight ◽  
High Molecular Weight ◽  
Renewable Resources ◽  
High Performance ◽  
Good Thermal Stability ◽  
Aromatic Polyamides ◽  
High Performance Polymers ◽  
Furandicarboxylic Acid

Aromatic furanic polyamides with relatively high molecular weight were synthesized, and good thermal stability and mechanical properties were demonstrated.

Synthesis of AM-co-NVP and Thermal Stability in Hostile Saline Solution

2012 ◽  
Vol 602-604 ◽  
pp. 1349-1354 ◽  
Author(s):  
Rui Liu ◽  
Wan Fen Pu ◽  
Qin Peng ◽  
Feng Sheng Yao
Keyword(s):  
Thermal Stability ◽  
Saline Solution ◽  
Heat Stability ◽  
Structure Characterization ◽  
Vinyl Pyrrolidone ◽  
Molar Ratio ◽  
Mass Ratio ◽  
Excellent Thermal Stability ◽  
Hydrolyzed Polyacrylamide ◽  
Feed Molar Ratio

copolymer preparation; structure characterization; thermal stability; brines solution. Abstract. The copolymer (AM-co-NVP) of acrylamide (AM) and vinyl pyrrolidone (NVP) was carried out in the presence of 2,2'-azobis[2-methylpropionamidine] dihydrochloride（V50）as initiator by free radical polymerization. The copolymer was characterized by its chemical structure with Fourier transform infrared spectroscopy (FTIR). The heat resistance of AM-co-NVP at 100°C and 120°C in harsh saline solution with high mineralized concentration ranging from 5×104 mg/L to 20×104 mg/L containing 2.5% (mass ratio) CaCl2, 2.5% (mass ratio) MgCl2 and 95% NaCl (mass ratio) was investigated. The experimental results indicate that AM-co-NVP has excellent thermal stability in saline solution compared to partially hydrolyzed polyacrylamide (HPAM). What is more, the copolymer exhibited the most perfect thermal tolerance in high divalent saline solution when the feed molar ratio of AM and NVP is 91.5 to 8.5. The microstructures of the copolymer samples after thermal aging in hostile environment captured by scanning electron microscope (SEM）further proved the NVP monomer was effectively introduced leading to the copolymer favorable heat stability in particularly high mineralized solution.

Pressure-controlled synthesis of high-performance SrLiAl3N4:Eu2+ narrow-band red phosphors

2018 ◽  
Vol 6 (38) ◽  
pp. 10174-10178 ◽  
Author(s):  
Mu-Huai Fang ◽  
Yi-Ting Tsai ◽  
Hwo-Shuenn Sheu ◽  
Jyh-Fu Lee ◽  
Ru-Shi Liu
Keyword(s):  
Thermal Stability ◽  
High Performance ◽  
Narrow Band ◽  
Controlled Synthesis ◽  
Excellent Thermal Stability ◽  
Red Phosphors ◽  
Pressure Controlled ◽  
Emission Bandwidth ◽  
Narrow Emission

SrLiAl3N4:Eu2+ (SLA) phosphors have gained increasing attention worldwide due to their narrow emission bandwidth and excellent thermal stability.

Structure and Properties of Composite Films of Cellulose and Chitosan from Ionic Liquid

2012 ◽  
Vol 499 ◽  
pp. 80-84
Author(s):  
Huai Fang Wang ◽  
Wei Han Huang ◽  
Zhi Kai Wang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Ionic Liquid ◽  
Antimicrobial Property ◽  
Composite Films ◽  
Antibacterial Properties ◽  
Strong Interactions ◽  
Structure And Properties ◽  
Blend Films ◽  
Methyl Imidazole

A series of blend films of cellulose and chitosan were prepared from 1-ethyl-3-methyl imidazole acetate ([Emim] Ac) by coagulating with ethanol. Structure, mechanical properties, thermal stability and antibacterial properties were investigated. The results showed that there were strong interactions and good compatibility between cellulose and chitosan in blend films. The blend films possess good mechanical properties and thermal stability, and the existence of chitosan endows blend films with antimicrobial property.

scholarly journals Novel Intumescent Flame Retardant Masterbatch Prepared Through Different Processes and Its Application in EPDM/PP Thermoplastic Elastomer: Thermal Stability, Flame Retardancy, and Mechanical Properties

Polymers ◽  
2018 ◽  
Vol 11 (1) ◽  
pp. 50 ◽  
Author(s):  
Weidi He ◽  
Ying Zhou ◽  
Xiaolang Chen ◽  
Jianbing Guo ◽  
Dengfeng Zhou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Flame Retardancy ◽  
Flame Retardants ◽  
Thermoplastic Elastomer ◽  
Molar Ratio ◽  
Limiting Oxygen Index ◽  
Cone Calorimeter Test ◽  
Properties Of Materials ◽  
Intumescent Flame Retardants

In this work, the ethylene-propylene-diene monomer/polypropylene (EPDM/PP) thermoplastic elastomer filled with intumescent flame retardants (IFR) is fabricated by melting blend. The IFR are constituted with melamine phosphate-pentaerythritol (MP/PER) by compounding and reactive extruding, respectively. The effects of two kinds of MP/PER with different contents on the thermal stability, flame retardancy, and mechanical properties of materials are investigated by Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), limiting oxygen index (LOI), UL-94, cone calorimeter test (CCT), and scanning electron microscopy (SEM). FTIR results show that the reactive extruded MP/PER partly generates melamine pyrophosphate (MPP) compared with compound masterbatches. TGA data indicate that the best thermal stability is achieved when the molar ratio of MP/PER reaches 1.8. All the reactive samples show a higher flame retardancy than compound ones. The CCT results also exhibit the same trend as above in heat release and smoke production rate. The EPDM/PP composites filled with 30 and 35% reactive MP/PER exhibit the improved flame retardancy but become stiffer and more brittle. SEM photos display that better dispersion and smaller particle size are obtained for reactive samples.

Effect of Long-Term Aging on Microstructure and Mechanical Properties of a Wrought Ni-Base Superalloy

2015 ◽  
Vol 816 ◽  
pp. 546-550
Author(s):  
Chao Yuan ◽  
Huan Wang ◽  
Jian Ting Guo ◽  
He Yong Qin
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Room Temperature ◽  
Excellent Thermal Stability ◽  
Good Thermal Stability ◽  
Increasing Trend ◽  
Size And Morphology ◽  
Strength And Plasticity ◽  
Base Superalloy

During long-term and high temperature service, microstructures of superalloys may change and then have an adverse impact on mechanical properties, so the stabilities of a wrought Ni-base superalloy aging without stress at 650°C were investigated in this paper. The results showed that the size and morphology of γ' precipitates in the alloy were not obviously influenced with the increase of exposure time, and primary MC carbides present excellent thermal stability. Moreover, almost no detrimental phase was found. Tensile strength and plasticity at room temperature after aging remained steady. Under the condition of 650°C/823MPa, the stress ruptures life presented increasing trend overall and plasticity decreases slightly. In conclusion, the experiment alloy presents a good thermal stability at 650°C.

scholarly journals Enhanced strength of nano-polycrystalline diamond by introducing boron carbide interlayers at the grain boundaries

2020 ◽  
Vol 2 (2) ◽  
pp. 691-698 ◽  
Author(s):  
Bo Zhao ◽  
Shengya Zhang ◽  
Shuai Duan ◽  
Jingyan Song ◽  
Xiangjun Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Boron Carbide ◽  
Grain Boundaries ◽  
Materials Science ◽  
Polycrystalline Diamond ◽  
Excellent Thermal Stability

Polycrystalline diamond with high mechanical properties and excellent thermal stability plays an important role in industry and materials science.

Synthesis and properties of random polysulfone/polyethersulfone copolymers as high-performance polymers

2011 ◽  
Vol 31 (4) ◽  
Author(s):  
Yi-Nan Zhang ◽  
Shu-Ling Zhang ◽  
Yan-Hua Yang ◽  
Hong-Yi Qin ◽  
Dong Jiang
Keyword(s):  
Thermal Stability ◽  
Weight Loss ◽  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
High Performance ◽  
Excellent Thermal Stability ◽  
Elongation At Break ◽  
High Performance Polymers

Abstract A series of random polysulfone/polyethersulfone (PSF/PES) copolymers were synthesized by the polycondensation of 4,4′-isopropylidenediphenol, 4,4′-dihydroxyldiphenylsulfone, and 4,4′-dichlorodiphenylsulfone in the presence of potassium carbonate. The resulting copolymers displayed similar solubility with PSF and PES. The glass transition temperature and the 5% weight loss temperature of these copolymers varied in the range of 199°C–299°C and 467°C–498°C, respectively, which showed excellent thermal stability. Moreover, the elongation at break of these copolymers was much higher than that of PES, whereas the tensile strength was a little lower.

Sign in / Sign up

Export Citation Format

Share Document