scholarly journals Simultaneously enhanced mechanical properties and flame retardancy of UHMWPE with polydopamine-coated expandable graphite

RSC Advances ◽  
2019 ◽  
Vol 9 (37) ◽  
pp. 21371-21380 ◽  
Author(s):  
Huaming Wang ◽  
Jingshi Cao ◽  
Fubin Luo ◽  
Changlin Cao ◽  
Qingrong Qian ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polymer Composites ◽  
Flame Retardancy ◽  
Expandable Graphite

The potential prospect of expandable graphite (EG) in the development of polymer composites is severely limited by required large additions and poor interface compatibility with the polymer.

Expanded vermiculite-filled flexible polymer composites

2021 ◽  
pp. 009524432110290
Author(s):  
Mukaddes Sevval Cetin ◽  
Ozan Toprakci ◽  
Omer Suat Taskin ◽  
Abdullah Aksu ◽  
Hatice Aylin Karahan Toprakci
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Contact Angle ◽  
Polymer Composites ◽  
Flame Retardancy ◽  
Composite Films ◽  
Filler Concentration ◽  
High Shear ◽  
Flexible Polymer ◽  
Shear Mixing

This study focuses on the fabrication and characterization of vermiculite-filled flexible polymer composites. Exfoliated vermiculite was incorporated into triblock thermoplastic elastomer copolymer, styrene- b-(ethylene- co-butylene)- b-styrene (SEBS), at various levels from 1 to 15 wt% by a high shear mixer. The composite films were obtained by the combination of solvent casting and compression molding. The morphological, structural, thermal, and mechanical properties and contact angle of the composites were determined. Some micro-morphological differences were observed between the samples and the difference was assumed to be caused by high shear mixing and filler concentration. High shear mixing was found effective in terms of the detachment of vermiculite layers at all concentrations. However, at low filler loading, that behavior was more obvious. At 1 wt% filler concentration, mechanical properties increased that was probably caused by good filler-matrix interaction stemmed from smaller particle size. At higher vermiculite concentrations, fillers found to show agglomerations that led to a decrease in mechanical strength and strain at break. Elastic and secant modulus showed an increasing trend. Contact angle measurements were carried out to determine the oleophilic character of the samples. An increase in the vermiculite content resulted in higher oleophilic character and the lowest contact angle was obtained at 15 wt% VMT loading. In addition to these, thermal stability, thermal dimensional stability and flame retardancy were improved by the incorporation of VMT. 15 wt% vermiculite-filled sample showed the best performance in terms of thermal stability and flame retardancy.

scholarly journals Modification and Compounding of CaMgAl-Layered Double Hydroxides and Their Application in the Flame Retardance of Acrylonitrile-Butadiene-Styrene Resin

Polymers ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1623 ◽  
Author(s):  
Bai-nian Wang ◽  
Ming-yang Chen ◽  
Bao-jun Yang
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Flame Retardancy ◽  
Layered Double Hydroxides ◽  
Acrylonitrile Butadiene Styrene ◽  
Expandable Graphite ◽  
Gravimetric Analysis ◽  
Limiting Oxygen Index ◽  
Double Hydroxides ◽  
Butadiene Styrene

CaMgAl-layered double hydroxides (CaMgAl-LDHs) were synthesized by a co-precipitation method to prepare sodium oleate-modified, borate-intercalated CaMgAl-LDHs (O-CaMgAl-LDHs) using in-situ intercalation and modification, and the LDHs samples were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR), field emission scanning electron microscopy (FESEM), and thermal gravimetric analysis (TGA). The FESEM observations showed that the as-prepared CaMgAl-LDHs had a lamellar structure with a particle size of 200~500 nm, while the O-CaMgAl-LDHs had a plate-like structure with a particle size of about 100 nm. TGA showed that O-CaMgAl-LDHs resulted in higher thermal stability at high temperature compared to CaMgAl-LDHs. O-CaMgAl-LDHs/ABS composites were prepared by adding O-CaMgAl-LDHs to acrylonitrile-butadiene-styrene resin (ABS) to test the resulting flame retardancy and mechanical properties, and the results showed that the limiting oxygen index (LOI) could increase from 18% to 26%, while the mechanical properties decreased significantly when the added fraction was 40% (relative to ABS). O-CaMgAl-LDHs, ammonium polyphosphate (APP) and expandable graphite (EG) were added into the ABS to prepare ABS composites, and the effects of different compositions on the flame retardancy and mechanical properties of the ABS composites were investigated. The results showed that, when adding 5 g of O-CaMgAl-LDHs, 1 g of APP, and 14 g of EG into 40 g of ABS, the LOI of the ABS composite reached 28.8%, and the composite prepared could meet the V-0 grade requirements of the UL-94 combustion test, while the flexural strength decreased only 21.9% compared to pure ABS, the smallest decrease compared to all of the other composites.

Impact of expandable graphite on flame retardancy and mechanical properties of rigid polyurethane foam

2018 ◽  
Vol 40 (S2) ◽  
pp. E1705-E1715 ◽  
Author(s):  
Pablo Acuña ◽  
Mercedes Santiago‐Calvo ◽  
Fernando Villafañe ◽  
Miguel Angel Rodríguez‐Perez ◽  
Javier Rosas ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Polyurethane Foam ◽  
Flame Retardancy ◽  
Expandable Graphite ◽  
Rigid Polyurethane Foam

scholarly journals EG/TPU composites with enhanced flame retardancy and mechanical properties prepared by microlayer coextrusion technology

RSC Advances ◽  
2019 ◽  
Vol 9 (41) ◽  
pp. 23944-23956 ◽  
Author(s):  
Chao Zhang ◽  
Meinong Shi ◽  
Youchen Zhang ◽  
Weimin Yang ◽  
Zhiwei Jiao ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flame Retardancy ◽  
Thermoplastic Polyurethane ◽  
Expandable Graphite ◽  
Two Dimensional ◽  
Plane Orientation ◽  
Dimensional Plane

In this work, expandable graphite (EG)/thermoplastic polyurethane (TPU) composites with excellent exfoliation, dispersion and two-dimensional plane orientation of the EG fillers were manufactured by microlayer coextrusion technology.

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