Effect of Silica on Uncompatibilized and Compatibilized Styrene Butadiene Rubber and Nitrile Rubber Blends

J of Applied Polymer Sci

2020

Hydroxyapatite nanoparticles (HA) reinforced polymer blend based on chlorinated nitrile rubber (Cl‐NBR) and chlorinated ethylene propylene diene monomer rubber (Cl‐EPDM) were prepared. Resulting blend composites were analyzed with regard to their rheometric processing, crystallinity, glass transition temperature (Tg), mechanical properties, oil resistance, AC conductivity, and transport behavior. The decrease in optimum cure time with the addition of HA is more advantageous for the development of products from these blend nanocomposites. The XRD, FTIR, and SEM confirmed the attachment and uniform dispersion of HA nanoparticles in the Cl‐NBR/Cl‐EPDM blend. The good compatibility between polymer blend and nanoparticles was also deduced by the formation of spherically shaped HA particles in the blend matrix determined by TEM analysis. DSC analysis showed an increase in Tg of the blend with the filler loading. The addition of HA particles to the blend produced a remarkable increase in tensile and tear strength, hardness, AC conductivity, abrasion, and oil resistance. The diffusion of blend composites was decreased with an increase in penetrant size. The diffusion mechanism was found to follow an anomalous trend. Among the blend composites, the sample with 7 phr of HA not only showed good oil and solvent resistance but also a remarkable increase in AC conductivity and mechanical properties.

Section: Resultsmentioning

confidence: 99%

Development of hydroxyapatite nanoparticles reinforced chlorinated acrylonitrile butadiene rubber/chlorinated ethylene propylene diene monomer rubber blends

Nihmath

J of Applied Polymer Sci

2020

“…Therefore, the filler particle will hold the polymer chain together and increase their resistance to deformation and this causes an increase in composite modulus. 31…”

Section: Resultsmentioning

confidence: 99%

Effect of fly ash on thermal stability, flammability, oil resistance and transport properties of chlorinated styrene butadiene rubber composites

Journal of Elastomers & Plastics

2013

Fly ash (FA) can be used as a filler in rubber vulcanizates to get rid off their waste. Polymer composite based on chlorinated styrene butadiene rubber (CSBR)/containing varying amount of FA composites has been developed by melt compounding followed by dicumyl peroxide vulcanization. The influence of increased loading of FA on the cure characteristics, mechanical properties, thermal stability, flame and oil resistance has been investigated. The increase in FA loading in CSBR matrices has been found to accelerate the curing process up to 37% compared to unfilled sample. The uniform distribution of FA in CSBR has been confirmed by scanning electron microscopy, which also explained the improved mechanical properties, flame and oil resistance of the composites. The diffusion rate of aromatic hydrocarbon solvents through the composite film is minimum for composites with 30 phr of filler and the rate is increased with increasing the filler content. Activation parameters are estimated and the molecular mass is calculated using Flory–Rehner theory. The sorption data are used to estimate the enthalpy, entropy and free energy of mixing. Mechanical properties such as tensile strength, modulus and hardness of the samples decreased after immersion in ASTM oil and the decreasing trend is lower for 30 phr FA-filled samples.

“…[1][2][3] These mechanical properties depend on the degree of compatibility of blend, and a high degree of compatibility indicates higher interaction between the polymeric phases of the polymer blend. 4,5 Therefore, different functional groups containing polymers allow the resulting blends to be compatible with a significant mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to pristine polymers, polymer blends possess many desirable properties, including enhanced gas‐barrier properties, corrosion resistance, ionic conductivity, thermal stability, and mechanical strength . These mechanical properties depend on the degree of compatibility of blend, and a high degree of compatibility indicates higher interaction between the polymeric phases of the polymer blend . Therefore, different functional groups containing polymers allow the resulting blends to be compatible with a significant mechanical performance.…”

Section: Introductionmentioning

confidence: 99%

Preparation, characterization, electrical and antibacterial properties of sericin/poly(vinyl alcohol)/poly(vinyl pyrrolidone) composites

J of Applied Polymer Sci

Athira

Jayakrishnan

et al. 2016

Self Cite

In this study, we focused on the fabrication of poly(vinyl alcohol) (PVA)/poly(vinyl pyrrolidone) (PVP)/sericin composites via a simple solution-blending method. The composites were characterized by Fourier transform infrared (FTIR) spectroscopy, UV spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), differential scanning calorimetry, thermogravimetric analysis (TGA), and measurements of the conductivity, tensile strength, and antibacterial activity against Staphylococcus aureus. The results of FTIR and UV spectroscopy implied the occurrence of hydrogen bonding between sericin and the PVA/PVP blend. The structure and morphology, studied by XRD and SEM, revealed that the sericin particles were well dispersed and arranged in an orderly fashion in the blend. The glass-transition temperature (T g ) of the composite was higher than that of the pure blend, and the T g value shifted toward higher temperatures when the volume fraction of sericin increased. TGA indicated that sericin retarded the thermal degradation; this depended on the filler concentration. The mechanical and electrical properties, such as the tensile strength, alternating-current electrical conductivity, dielectric constant, and dielectric loss of the composites, were higher than those of the pure blend, and these properties were enhanced when the concentration of sericin was increased up to 10 wt % filler content, whereas the elongation at break of the composite decreased with the addition of sericin particles. The antibacterial properties of the composite showed that sericin had a significant inhibitory effect against S.