Mechanical Strength Management of Polymer Composites through Tuning Transient Networks

2020 ◽  
Vol 11 (3) ◽  
pp. 710-715 ◽  
Author(s):  
Xue-Zheng Cao ◽  
Holger Merlitz ◽  
Chen-Xu Wu
Keyword(s):  
Mechanical Strength ◽  
Polymer Composites ◽  
Transient Networks

Anisotropically Functionalized Nanotube Anchors for Improving the Mechanical Strength of Immiscible Polymer Composites

2020 ◽  
Author(s):  
Lawrence Barrett ◽  
Fatoumata Ide Seyni ◽  
Mallikharjuna Rao Komarneni ◽  
John A. Zapata-Hincapie ◽  
Daniel T. Glatzhofer ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Polymer Composites ◽  
Immiscible Polymer

Tensile Properties of Epoxy Matrix Reinforced with Fique Fabric

2020 ◽  
Vol 1012 ◽  
pp. 14-19
Author(s):  
Michelle Souza Oliveira ◽  
Fabio da Costa Garcia Filho ◽  
Fernanda Santos da Luz ◽  
Artur Camposo Pereira ◽  
Luana Cristyne da Cruz Demosthenes ◽  
...  
Keyword(s):  
Mechanical Strength ◽  
Polymer Composites ◽  
Natural Fiber ◽  
Volume Fraction ◽  
Fiber Reinforced Polymer ◽  
Epoxy Composites ◽  
Synthetic Fiber ◽  
Fiber Reinforced ◽  
Reinforced Polymer ◽  
Fiber Reinforced Polymer Composites

Composite materials are being extensively studied for ballistic armor. Their main advantage is connected to the possibility of deeply reducing weight and costs by maintaining high performances in terms of strength and security. Epoxy composites are reinforced with natural fibers which are replacing other synthetic reinforcement materials. Composites are prepared using polymers as matrix material because of ease of production with different reinforcements. The mechanical strength of the natural fiber reinforced polymer composites has been compared with synthetic fiber reinforced polymer composites and it is found that for achieving equivalent mechanical strength of the material, the volume fraction of the natural fiber should be much higher than synthetic fiber. This work being an experimental study on untreated “as received” fique fabric-reinforced epoxy composites, to demonstrate the potential of this renewable source of natural fiber for use in a number of applications.

Synergism in Binary (MWNT, SLG) Nano-carbons in Polymer Nano-composites: A Raman Study

2013 ◽  
Vol 1505 ◽  
Author(s):  
Peng Xu ◽  
James Loomis ◽  
Ben King ◽  
Balaji Panchapakesan
Keyword(s):  
Mechanical Strength ◽  
Polymer Composites ◽  
Load Transfer ◽  
Synergistic Effects ◽  
Cooperative Behavior ◽  
Single Layer Graphene ◽  
Polymeric Chain ◽  
Uniaxial Tensile ◽  
Advanced Composites ◽  
Nano Carbon

ABSTRACTLoad transfer and mechanical strength of reinforced polymers are fundamental to developing advanced composites. This paper demonstrates enhanced load transfer and mechanical strength due to synergistic effects in binary mixtures of nano-carbon/polymer composites. Different compositional mixtures (always 1 wt. % total) of multi-wall carbon nanotubes (MWNTs) and single-layer graphene (SLG) were mixed in polydimethylsiloxane (PDMS), and effects on load transfer and mechanical strength were studied using Raman spectroscopy. Significant shifts in the G-bands were observed both in tension and compression for single as well binary nano-carbon counterparts in polymer composites. Small amounts of MWNT0.1 dispersed in SLG0.9/PDMS samples (subscripts represents weight percentage) reversed the sign of the Raman wavenumbers from positive to negative values demonstrating reversal of lattice stress. A wavenumber change from 10 cm-1 in compression (-10% strain) to 10 cm-1 in tension (50% strain), and an increase in elastic modulus of ∼103% was observed for MWNT0.1SLG0.9/PDMS with applied uniaxial tension. Presence of MWNTs in the matrix reduced the segmental polymeric chain length and provided limited extensibility to the chains. This in turn eliminated compressive deformation of SLG and significantly enhanced load transfer and mechanical strength of composites in tension. The orientation order of MWNT with application of uniaxial tensile strain directly affected the shift in Raman wavenumbers (2D band and G-band) and load transfer. It is observed that the cooperative behavior of binary nano-carbons in polymer composites resulted in enhanced load transfer and mechanical strength. Such binary compositions could be fundamental to developing advanced composites.

scholarly journals Stretchable and Washable Electroluminescent Display Screen-Printed on Textile

Nanomaterials ◽  
2019 ◽  
Vol 9 (9) ◽  
pp. 1276 ◽  
Author(s):  
Daniel Janczak ◽  
Marcin Zych ◽  
Tomasz Raczyński ◽  
Łucja Dybowska-Sarapuk ◽  
Andrzej Pepłowski ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Mechanical Strength ◽  
Rheological Properties ◽  
Polymer Composites ◽  
Screen Printing ◽  
Printed Electronics ◽  
Wearable Electronics ◽  
Printing Technology ◽  
Wide Range ◽  
Screen Printing Technology

Stretchable polymer composites are a new group of materials with a wide range of application possibilities in wearable electronics. The purpose of this study was to fabricate stretchable electroluminescent (EL) structures using developed polymer compositions, based on multiple different nanomaterials: luminophore nanopowders, dielectric, carbon nanotubes, and conductive platelets. The multi-layered EL structures have been printed directly on textiles using screen printing technology. During research, the appropriate rheological properties of the developed composite pastes, and their suitability for printed electronics, have been confirmed. The structure that has been created from the developed materials has been tested in terms of its mechanical strength and resistance to washing or ironing.

The DMA, TG/DTA and FT-IR Characteristics of Wood Polymer Composites

2012 ◽  
Vol 445 ◽  
pp. 219-224 ◽  
Author(s):  
Ahmet Koyun ◽  
Esma Ahlatcioglu ◽  
Duygu Ceylan Erdogan ◽  
Yeliz Koca Ipek
Keyword(s):  
Mechanical Strength ◽  
Polymer Composites ◽  
Viscoelastic Behavior ◽  
Wood Chips ◽  
Wood Polymer ◽  
Content Preparation ◽  
Ft Ir ◽  
Long Term Behavior ◽  
The Relationship

Wood chips and polymer composites are effectively used in the industrial products. It is important to establish a relationship between mechanical strength and processability in extruder of these composites. Especially, the most important factor is to determine the time-dependent strength. Although many short-term values were obtained via normal mechanical experiments, very little effort has been spent in order to estimate the long-term behavior of polymer. Composites were prepared with processed and unprocessed wood chips. Pretreatment of wood chips were carried out by using hydrochloric acid (HCl) and water. The products were prepared with different ratios of mixtures which contain wood chips and high density polyethylene (HDPE) grains. The long-term mechanical behavior and viscoelastic behavior of these composites were analyzed using Dynamic Mechanic Analyzer (DMA) test equipment. The effect of composite content and pretreatment method of wood chips on mechanical strength of wood plastic composites (WPCs) were determined. The relationship among the composite content, preparation method of wood chips, DMA and TG/DTA test results were tried to establish. FT-IR spectrums of the beginning materials and the composites are also examined in order to determine the chemical bonds of these materials.

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