scholarly journals Effect of MWNTs and SiC-Coated MWNTs on Properties of PEEK/LCP Blend

2009 ◽  
Vol 2009 ◽  
pp. 1-6 ◽  
Author(s):  
Ganesh Chandra Nayak ◽  
R. Rajasekar ◽  
Saswata Bose ◽  
Chapal Kumar Das
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Silicon Carbide ◽  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Multiwall Carbon Nanotubes ◽  
Tensile Modulus ◽  
Melt Blending ◽  
Multiwall Carbon

Multiwall carbon nanotubes (MWNTs) were modified with polycarbosilane-derived silicon carbide (SiC) to improve its dispersion in the polymer matrix. PEEK/LCP/MWNTs nanocomposites were prepared by melt blending. TEM images show the improved dispersion of SiC-coated MWNTs against agglomerated structure of pure MWNTs in the blend. FESEM images shows better fibrillation of LCP in presence of SiC-coated MWNTs. TGA reveals that nanocomposites with SiC-coated MWNTs shows higher thermal stability than MWNTs filled blend system. Based on enhanced dispersion, storage modulus, tensile modulus and tensile strength were increased drastically with the incorporation of SiC-coated MWNTs. Glass transition temperature of the nanocomposites shows significant improvement with the incorporation of MWNTs.

scholarly journals Tensile Strength of Spinnable Multiwall Carbon Nanotubes

2011 ◽  
Vol 10 ◽  
pp. 2572-2578 ◽  
Author(s):  
N. Khandoker ◽  
S.C. Hawkins ◽  
R. Ibrahim ◽  
C.P. Huynh ◽  
F. Deng
Keyword(s):  
Carbon Nanotubes ◽  
Tensile Strength ◽  
Multiwall Carbon Nanotubes ◽  
Multiwall Carbon

scholarly journals Effects of Adding Multiwall Carbon Nanotubes on Performance of Polyvinyl Acetate and Urea-Formaldehyde Adhesives in Tropical Timber Species

2015 ◽  
Vol 2015 ◽  
pp. 1-15 ◽  
Author(s):  
Róger Moya ◽  
Ana Rodríguez-Zúñiga ◽  
José Vega-Baudrit
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Polyvinyl Acetate ◽  
Urea Formaldehyde ◽  
Multiwall Carbon Nanotubes ◽  
Hydroxyl Groups ◽  
Timber Species ◽  
Tropical Timber ◽  
Tropical Woods ◽  
Multiwall Carbon

Multiwall carbon nanotubes (MWCNTs) functionalized with hydroxyl groups (MWCNTs-OH) have been incorporated into polyvinyl acetate (PVAc) and urea-formaldehyde (UF) adhesives utilized in tropical wood gluing. The Raman spectroscopy, the atomic force microscopy (AFM), and transmission electron microscopy (TEM) were used to describe the MWCNTs-OH. The adhesives were evaluated in three concentrations of MWCNTs-OH: 0% (control), 0.05%, and 0.1%. The evaluation included color, the distribution of MWCNTs-OH by TEM and AFM, thermal stability and viscosity of the adhesives, and shear strength (SS) of the glue line for nine tropical woods. AFM and TEM confirmed interaction of MWCNTs-OH with adhesives. The viscosity of the PVAc adhesive increases with added MWCNTs-OH. The incorporation of MWCNTs-OH in PVAc and UF resin produces wood adhesives with less brightness, less yellowness, and increased redness. The nanotubes in the adhesive improved the thermal stability of the composites and increased the entropy factor and energy of activation in the kinetic decomposition of the resin. In relation to SS, MWCNTs-OH in any of the two concentrations had no significant effect on SS in dry condition in half of the species studied glued with PVAc adhesive, whereas, for UF-adhesive, the SS and percentage of wood failure improved in most of the 9 species studied.

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.

The Research of Poly Propylene Carbonate /Nano-SiO2 Composites

2014 ◽  
Vol 904 ◽  
pp. 74-77 ◽  
Author(s):  
Qu Li ◽  
Heng Wu ◽  
Si Yuan Xie ◽  
Jiao Sun ◽  
Xing Hai Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Propylene Carbonate ◽  
Tensile Tests ◽  
Slight Improvement ◽  
Biodegradable Poly ◽  
Poly Propylene

Biodegradable poly (propylene carbonate) (PPC) composite with a slight improvement in the thermal stability and tensile strength was successfully prepared by incorporating a low content of nano-SiO2. Tensile tests demonstrate the better mechanical properties of the composites prepared in this study. The obtained composites increases sharply from 1.57Mpa to 12.04Mpa by incorporating 5wt% nano-SiO2. Furthermore, the composites show approximately 8°C higher glass transition temperature (Tg) than that of neat PPC.The Tdmax of composite with 5wt% of nano-SiO2 was about 40°C higher than that of neat PPC.

Thermal and Flame Retardant Properties of MWNT Reinforced Conductive PAN Film

2014 ◽  
Vol 924 ◽  
pp. 253-259
Author(s):  
Zhuo Chen ◽  
Xian Dong ◽  
Wei Zhao ◽  
Ke Jia Liu ◽  
Ji Ping Liu
Keyword(s):  
Carbon Nanotubes ◽  
Thermal Stability ◽  
Electrical Conductivity ◽  
Composite Film ◽  
Multiwall Carbon Nanotubes ◽  
Ultrasonic Dispersion ◽  
Vacuum Casting ◽  
Ft Ir ◽  
Flame Retardant Properties ◽  
Multiwall Carbon

Conductive polyacrylonitrile film reinforced by multiwall carbon nanotubes was prepared via ultrasonic dispersion and vacuum casting. The structure of MWNT/PAN composite film was characterized by WAXD and FT-IR. The LOI of the blend was enhanced from 18.1 % to 24.5 % and TGA show better thermal stability. MWNT composite at 10 wt% MWNT loading showed an electrical conductivity of 10-2S/cm.

scholarly journals Development and Assessment of Polyester Reinforced with Sansevieria Cylindrica/Zawa Flour Composites

2015 ◽  
Vol 51 ◽  
pp. 144-154
Author(s):  
Ravindra Gandhi Manne ◽  
M. Ashok Kumar ◽  
V. Nikill Murthy ◽  
N. Karthikeyan ◽  
M. Johnson
Keyword(s):  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Hybrid Composites ◽  
Flexural Modulus ◽  
Tensile Modulus ◽  
Clear Indication ◽  
Dsc Analysis ◽  
Polyester Matrix ◽  
Tga Analysis

This paper zero in on preparation of hybrid composites in which Polyester matrix filled with Sanseveria cylindrica fiber(SCF) and Zawa flour. SCF fiber was taken 10% volume constantly in all the samples. Camera ready samples were prepared using hand layup technique in which filler constituent proportions were taken by using rule of hybrid mixture (RoHM). The mail aim of the composites is to increase the tensile flexural, and impact strengths, TGA, DSC results by incorporating the filler. It was observed that, tensile strength was linearly increased up to 4wt.% zawa after that sudden falling was observed. On other hand, tensile modulus was increased linearly up to 5wt.% was the clear indication of addition of zawa imparts more stiffness to the composites. Flexural strength was increased up 3wt.% zawa flour after than it starts depreciating suddenly. Flexural modulus was increased linearly up to 3wt.% zawa four composites after that decreases. Impact strength was optimised at 4wt.% zawa flour after that it starts going down. In DSC analysis, for 3wt.% zawa flour composite registered good performance than the 2wt.%,whereas in TGA analysis 3wt.% composite was having good performance than 2wt.% zawa flour composites. Reasons attributed for increased glass transition temperature was due to the less moisture content or due to the deprived of void due to the good bonding strength

scholarly journals Enhancing The Mechanical Properties of Chopped Basalt Composites by Incorporating of Multiwall Carbon Nanotubes

2019 ◽  
Vol 9 (1) ◽  
pp. 5646-5650
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Mechanical Performance ◽  
Testing Machine ◽  
Basalt Fiber ◽  
Multiwall Carbon Nanotubes ◽  
Tensile Modulus ◽  
Basalt Fibre ◽  
Multiwall Carbon

This study aims to develop and determine mechanical properties chopped basalt fibre reinforced composites (CBFRP) modified with multiwall carbon nanotubes (CNT). Chopped basalt composite modified with CNT was fabricated using a combination of mechanical stirring and hand layup process. Three different weight percentages of CNT i.e. 0.5, 1, 1.5wt. % were filled into epoxy resin before mixing with chopped basalt fiber. The mechanical performance namely tensile properties and fracture toughness behaviour of the fabricated chopped basalt composites was assessed using Universal Testing Machine in accordance to ASTM standard D368 and D695, respectively. The results showed that the incorporation of CNT enhanced tensile and fracture toughness properties of the CBFRP composites. However, a higher amount of CNT (1.5wt%) incorporated into the CBFRP caused reduction in tensile strength, tensile modulus and Gic by 4.40%, 2.46% and 30.36 %, respectively, as compared to those of 1.0CNT-CBFRP

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