Hydrothermal effects on the thermomechanical properties of high performance epoxy/clay nanocomposites

2005 ◽  
Vol 46 (2) ◽  
pp. 215-221 ◽  
Author(s):  
Lei Wang ◽  
Ke Wang ◽  
Ling Chen ◽  
Chaobin He ◽  
Yongwei Zhang
Keyword(s):  
High Performance ◽  
Thermomechanical Properties ◽  
Clay Nanocomposites

scholarly journals Correlation between Structure and Dielectric Breakdown in LDPE/HDPE/Clay Nanocomposites

2014 ◽  
Vol 2014 ◽  
pp. 1-9 ◽  
Author(s):  
B. Zazoum ◽  
E. David ◽  
A. D. Ngô
Keyword(s):  
High Density Polyethylene ◽  
Dielectric Breakdown ◽  
Breakdown Strength ◽  
Thermomechanical Properties ◽  
Clay Nanocomposites ◽  
Screw Extruder ◽  
Short Term ◽  
Polyethylene Blend ◽  
Twin Screw ◽  
High Voltage Insulation

Cross-linked polyethylene (XLPE) is commonly used in medium/high voltage insulation due to its excellent dielectric properties and acceptable thermomechanical properties. To improve both electrical and thermal properties to a point that would possibly avoid the need for crosslinking, nanoclay fillers can be added to polymer matrix to form nanocomposites materials. In this paper, PE/clay nanocomposites were processed by mixing a commercially available premixed polyethylene/O-MMT masterbatch into a polyethylene blend matrix containing 80 wt% low density polyethylene LDPE and 20 wt% high density polyethylene HDPE with and without compatibilizer using a corotating twin-screw extruder. Various characterization techniques were employed in this paper, including optical microscopy, AFM, TEM, TGA, DMTA, and dielectric breakdown measurements in order to understand the correlation between structure and short-term dielectric breakdown strength.

scholarly journals Impact of Alternative Stabilization Strategies for the Production of PAN-Based Carbon Fibers with High Performance

Fibers ◽  
2020 ◽  
Vol 8 (6) ◽  
pp. 33 ◽  
Author(s):  
Spyridon Soulis ◽  
George Konstantopoulos ◽  
Elias P. Koumoulos ◽  
Costas A. Charitidis
Keyword(s):  
Mechanical Properties ◽  
Carbon Fibers ◽  
Thermal Processing ◽  
High Performance ◽  
Relevant Literature ◽  
Thermomechanical Properties ◽  
Composition Effect ◽  
Ladder Polymer ◽  
Fiber Manufacturing ◽  
Time And Energy

The aim of this work is to review a possible correlation of composition, thermal processing, and recent alternative stabilization technologies to the mechanical properties. The chemical microstructure of polyacrylonitrile (PAN) is discussed in detail to understand the influence in thermomechanical properties during stabilization by observing transformation from thermoplastic to ladder polymer. In addition, relevant literature data are used to understand the comonomer composition effect on mechanical properties. Technologies of direct fiber heating by irradiation have been recently involved and hold promise to enhance performance, reduce processing time and energy consumption. Carbon fiber manufacturing can provide benefits by using higher comonomer ratios, similar to textile grade or melt-spun PAN, in order to cut costs derived from an acrylonitrile precursor, without suffering in regard to mechanical properties. Energy intensive processes of stabilization and carbonization remain a challenging field of research in order to reduce both environmental impact and cost of the wide commercialization of carbon fibers (CFs) to enable their broad application.

Development of high-performance epoxy/clay nanocomposites by incorporating novel phosphonium modified montmorillonite

2011 ◽  
Vol 122 (1) ◽  
pp. 666-675 ◽  
Author(s):  
Keiji Saitoh ◽  
Kenji Ohashi ◽  
Toshiyuki Oyama ◽  
Akio Takahashi ◽  
Joji Kadota ◽  
...  
Keyword(s):  
High Performance ◽  
Clay Nanocomposites ◽  
Modified Montmorillonite

scholarly journals UV-crosslinked poly(arylene ether sulfone) – LAPONITE® nanocomposites for proton exchange membranes

RSC Advances ◽  
2017 ◽  
Vol 7 (45) ◽  
pp. 28358-28365 ◽  
Author(s):  
Sun Hwa Lee ◽  
Won Jun Lee ◽  
Tae Kyoung Kim ◽  
Mustafa K. Bayazit ◽  
Sang Ouk Kim ◽  
...  
Keyword(s):  
Fuel Cells ◽  
High Performance ◽  
Proton Exchange Membrane ◽  
Proton Exchange Membranes ◽  
Proton Exchange ◽  
Clay Nanocomposites ◽  
Arylene Ether ◽  
Exchange Membrane ◽  
Sulfonated Poly

UV-crosslinked sulfonated poly(arylene sulfone)/clay nanocomposites are fabricated by incorporating UV-crosslinkable monomers, bridge molecules, and clay nanofillers for high performance proton exchange membrane fuel cells.

Nanohybrids of organo-modified layered double hydroxides and polyurethanes with enhanced mechanical, damping and UV absorption properties

RSC Advances ◽  
2016 ◽  
Vol 6 (41) ◽  
pp. 34288-34296 ◽  
Author(s):  
Hao Zhang ◽  
Jun Zhang ◽  
Rongping Yun ◽  
Zhiguo Jiang ◽  
Haimei Liu ◽  
...  
Keyword(s):  
Layered Double Hydroxides ◽  
High Performance ◽  
Uv Absorption ◽  
Clay Nanocomposites ◽  
Absorption Properties ◽  
High Performance Polymer ◽  
Mechanical Damping ◽  
Double Hydroxides

The construction of high-performance polymer–clay nanocomposites plays an important role in developing new types of organic–inorganic hybrids.

scholarly journals Synthesis of Benzene Tetracarboxamide Polyamine and Its Effect on Epoxy Resin Properties

Polymers ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 782 ◽  
Author(s):  
Seoyoon Yu ◽  
Wonjoo Lee ◽  
Bongkuk Seo ◽  
Chung-Sun Lim
Keyword(s):  
Epoxy Resin ◽  
Epoxy Resins ◽  
High Performance ◽  
Protective Coatings ◽  
Industrial Applications ◽  
Thermomechanical Properties ◽  
Scanning Calorimetry ◽  
Adhesive Properties ◽  
Cross Sectional ◽  
Value Determination

Epoxy resins have found various industrial applications in high-performance thermosetting resins, high-performance composites, electronic-packaging materials, adhesives, protective coatings, etc., due to their outstanding performance, including high toughness, high-temperature performance, chemical and environmental resistance, versatile processability and adhesive properties. However, cured epoxy resins are very brittle, which limits their applications. In this work, we attempted to enhance the toughness of cured epoxy resins by introducing benzene tetracarboxamide polyamine (BTCP), synthesized from pyromellitic dianhydride (PMDA) and diamines in N-methyl-2-pyrrolidone (NMP) solvent. During this reaction, increased viscosity and formation of amic acid could be confirmed. The chemical reactions were monitored and evidenced using 1H-NMR spectroscopy, FT-IR spectroscopy, water gel-phase chromatography (GPC) analysis, amine value determination and acid value determination. We also studied the effect of additives on thermomechanical properties using differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), dynamical mechanical analysis (DMA), thermomechanical analysis (TMA) and by measuring mechanical properties. The BTCP-containing epoxy resin exhibited high mechanical strength and adhesion strength proportional to the amount of BTCP. Furthermore, field-emission scanning electron microscopy images were obtained for examining the cross-sectional morphology changes of the epoxy resin specimens with varying amounts of BTCP.

Thermo-mechanical characterization of discontinuous recycled/repurposed carbon fiber reinforced thermoplastic organosheet composites

2021 ◽  
pp. 002199832110157
Author(s):  
Philip R Barnett ◽  
Stephen A Young ◽  
Vivek Chawla ◽  
Darren M Foster ◽  
Dayakar Penumadu
Keyword(s):  
Mechanical Properties ◽  
Carbon Fiber ◽  
High Performance ◽  
Thermomechanical Properties ◽  
Polyphenylene Sulfide ◽  
Single Fiber ◽  
Thermoplastic Resin ◽  
Scanning Calorimetry ◽  
Post Process ◽  
Process Annealing

The integration of repurposed and recycled carbon fibers into high-performance composites is essential to the adoption of composites for automotive structures due to their low-cost, high formability, and reduced environmental impact. When high areal density nonwovens of these fibers are infused with a semi-crystalline thermoplastic resin, organosheets offering competitive mechanical properties can be produced. This study examined the optimization of such composites through multiscale material characterization and post-process annealing. Single fiber tensile tests were used to characterize repurposed and recycled fiber formats. The thermomechanical properties of the polyphenylene sulfide matrix and resulting composites subjected to different post-process annealing conditions were characterized using differential scanning calorimetry, dynamic mechanical analysis, and nano-indentation. Single fiber push-in testing was conducted to evaluate the fiber–matrix interface as a function of annealing. It was shown that statistical methods based on the bootstrap principle successfully identify the effects of post-process annealing, which are otherwise masked by material inhomogeneity. Post-process annealing was shown to be an effective method of improving the resulting mechanical properties of repurposed and recycled carbon fiber organosheet composites, thereby optimizing their properties for use as a high-performance automotive structural material.

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