scholarly journals Influence of Particle Size, Additive Ratio and Chemical Structure of Zinc Borate on Thermal and Mechanical Properties of Polyvinyl Chloride

2021 ◽  
Author(s):  
Yeliz İPEK
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Polyvinyl Chloride ◽  
Chemical Structure ◽  
Zinc Borate ◽  
Thermal And Mechanical Properties

Functionalized polyvinyl chloride/layered double hydroxide nanocomposites and its thermal and mechanical properties

2020 ◽  
Vol 137 (27) ◽  
pp. 48894 ◽  
Author(s):  
Monika Singh ◽  
Divya Somvanshi ◽  
Rajesh K. Singh ◽  
Arun K. Mahanta ◽  
Pralay Maiti ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Layered Double Hydroxide ◽  
Polyvinyl Chloride ◽  
Thermal And Mechanical Properties ◽  
Double Hydroxide

Mechanical and Thermal Properties of Ternary System Based on Starch-Grafted-Polyethylene/High Density Polyethylene/Halloysite Nanocomposites

2019 ◽  
Vol 800 ◽  
pp. 210-215
Author(s):  
Walid Fermas ◽  
Mustapha Kaci ◽  
Remo Merijs Meri ◽  
Janis Zicans
Keyword(s):  
Mechanical Properties ◽  
High Density Polyethylene ◽  
Chemical Structure ◽  
Filler Content ◽  
Halloysite Nanotubes ◽  
High Density ◽  
Flexural Properties ◽  
Mechanical And Thermal Properties ◽  
Thermal And Mechanical Properties ◽  
Content Ratio

In this paper, the effect of unmodified halloysite nanotubes (HNTs) content on the chemical structure and the thermal and mechanical properties of blends based on starch-grafted-polyethylene (SgP) and high density polyethylene (HDPE) (70/30 w/w) nanocomposites was investigated at various filler content ratios, i.e. 1.5, 3 and 5 wt.%. The study showed the occurrence of chemical interactions between the polymer matrix and HNTs through OH bonding. Further, the addition of HNTs to the polymer blend led to an increase in the crystallization temperature of the nanocomposite samples, in particular at higher filler contents i.e. 3 and 5 wt.%, while the melting temperature remained almost unchanged. Tensile and flexural properties of the nanocomposite samples were however improved compared to the virgin blend with respect to the HNTs content ratio.

The Synergistic Effect of Flame Retardants on Flammability, Thermal and Mechanical Properties of Natural Fiber Reinforced Epoxy Composite

2016 ◽  
Vol 701 ◽  
pp. 281-285 ◽  
Author(s):  
Pooria Khalili ◽  
Kim Yeow Tshai ◽  
Ing Kong ◽  
Jun Hui Lee ◽  
Farzad Arefi Mostafa
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Mass Loss ◽  
Heat Release ◽  
Natural Fiber ◽  
Synergistic Effects ◽  
Epoxy Composites ◽  
Zinc Borate ◽  
Thermal And Mechanical Properties ◽  
Combustion Heat

Epoxy was effectively resin infused with 15 %wt intumescing Alumina Trihydrate (ATH) flame retardant (FR) formulations into a 10 %wt palm EFB natural fiber (NF) mat. The effects of ATH and its intumescing blend with Zinc Borate (ZB) and Ammonium Polyphosphate (APP) on flammability, thermal and mechanical properties of the composites were investigated. Compared to neat NF filled epoxy composites, specimens loaded with intumescing blend of FR formulations demonstrated an improved thermal properties, showing greater mass residual which can be attributed to the formation of cross-linked network amongst the NF, FRs and epoxy matrix upon combustion at elevated temperature tested within a TGA instrument. Incorporation of fibers drastically enhanced the mass residue and lowered the heat release compare to the pure epoxy. Addition of the intumescing blend of FR formulations also drastically reduces the combustion heat release, total mass loss and zero drip flame in the NF composites. The optimum FRs formulation with 5 %wt ATH and 10 %wt APP exhibited self-extinguishing property, achieved lowest mass loss and no drip flame under Bunsen burner tests, signifying the synergistic effects between ATH and APP within the NF epoxy composites. APP reacts with the carbonaceous network of NF throughout the ignition period, such interaction formed a thick char layer acting as gas and thermal barrier against the fire mechanism. This reaction does not take place in NF composite specimens without APP. In terms of mechanical properties, NF composites loaded with FRs broadly showed poorer tensile strength, mainly due to the existence of FRs, which acted as a nucleating agent affected the physico-mechanical characteristics of the composites. Amongst the FR rich formulations, specimens with APP or ZB blends seem to possess a more superior tensile strength compared with the neat ATH filled formulation. In addition, composites loaded with FRs showed enhanced Young’s modulus relative to those without addition of FRs.

scholarly journals Free-Radical Photopolymerization of Acrylonitrile Grafted onto Epoxidized Natural Rubber

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 660
Author(s):  
Rawdah Whba ◽  
Mohd Sukor Su’ait ◽  
Lee Tian Khoon ◽  
Salmiah Ibrahim ◽  
Nor Sabirin Mohamed ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Chemical Structure ◽  
Functional Group ◽  
Loss Modulus ◽  
Epoxidized Natural Rubber ◽  
Thermal And Mechanical Properties ◽  
Sample Analysis ◽  
Free Radical Photopolymerization ◽  
Ft Ir

The exploitation of epoxidized natural rubber (ENR) in electrochemical applications is approaching its limits because of its poor thermo-mechanical properties. These properties could be improved by chemical and/or physical modification, including grafting and/or crosslinking techniques. In this work, acrylonitrile (ACN) has been successfully grafted onto ENR- 25 by a radical photopolymerization technique. The effect of (ACN to ENR) mole ratios on chemical structure and interaction, thermo-mechanical behaviour and that related to the viscoelastic properties of the polymer was investigated. The existence of the –C≡N functional group at the end-product of ACN-g-ENR is confirmed by infrared (FT-IR) and nuclear magnetic resonance (NMR) analyses. An enhanced grafting efficiency (~57%) was obtained after ACN was grafted onto the isoprene unit of ENR- 25 and showing a significant improvement in thermal stability and dielectric properties. The viscoelastic behaviour of the sample analysis showed an increase of storage modulus up to 150 × 103 MPa and the temperature of glass transition (Tg) was between −40 and 10 °C. The loss modulus, relaxation process, and tan delta were also described. Overall, the ACN-g-ENR shows a distinctive improvement in characteristics compared to ENR and can be widely used in many applications where natural rubber is used but improved thermal and mechanical properties are required. Likewise, it may also be used in electronic applications, for example, as a polymer electrolyte in batteries or supercapacitor.

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