scholarly journals Thermal Stability and Rheological Properties of Epoxidized Natural Rubber-Based Magnetorheological Elastomer

2019 ◽  
Vol 20 (3) ◽  
pp. 746 ◽  
Author(s):  
Nurul Yunus ◽  
Saiful Mazlan ◽  
Ubaidillah ◽  
Siti Abdul Aziz ◽  
Salihah Tan Shilan ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Natural Rubber ◽  
Rheological Properties ◽  
Strain Amplitude ◽  
Thermal Analyses ◽  
Thermal Characteristics ◽  
Epoxidized Natural Rubber ◽  
Effect Of Temperature ◽  
Temperature Dependent ◽  
Roll Mill

Determination of the thermal characteristics and temperature-dependent rheological properties of the magnetorheological elastomers (MREs) is of paramount importance particularly with regards to MRE applications. Hitherto, a paucity of temperature dependent analysis has been conducted by MRE researchers. In this study, an investigation on the thermal and rheological properties of epoxidized natural rubber (ENR)-based MREs was performed. Various percentages of carbonyl iron particles (CIPs) were blended with the ENR compound using a two roll-mill for the preparation of the ENR-based MRE samples. The morphological, elemental, and thermal analyses were performed before the rheological test. Several characterizations, as well as the effects of the strain amplitude, temperature, and magnetic field on the rheological properties of ENR-based MRE samples, were evaluated. The micrographs and elemental results were well-correlated regarding the CIP and Fe contents, and a uniform distribution of CIPs was achieved. The results of the thermal test indicated that the incorporation of CIPs enhanced the thermal stability of the ENR-based MREs. Based on the rheological analysis, the storage modulus and loss factor were dependent on the CIP content and strain amplitude. The effect of temperature on the rheological properties revealed that the stiffness of the ENR-based MREs was considered stable, and they were appropriate to be employed in the MRE devices exposed to high temperatures above 45 °C.

Physical and rheological properties of epoxidized natural rubber modified bitumens

2014 ◽  
Vol 63 ◽  
pp. 242-248 ◽  
Author(s):  
Ramez A. Al-Mansob ◽  
Amiruddin Ismail ◽  
Aows N. Alduri ◽  
Che Husna Azhari ◽  
Mohamed Rehan Karim ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Rheological Properties ◽  
Epoxidized Natural Rubber

Improvement of Mechanical Properties and Water Absorption in Wheat Gluten by Epoxidized Natural Rubber

2019 ◽  
Vol 891 ◽  
pp. 163-168
Author(s):  
Kantima Chaochanchaikul
Keyword(s):  
Natural Rubber ◽  
Water Absorption ◽  
Thermal Analyses ◽  
Wheat Gluten ◽  
Research Work ◽  
Decomposition Temperature ◽  
Epoxidized Natural Rubber ◽  
Elongation At Break ◽  
Opposite Behavior ◽  
Internal Mixer

TThe aims of this research work were to improve touhgness and water resistance of wheat gluten (WG) by epoxidized natural rubber (ENR) compared to glycerol. WG specimens were mixed and prepared by internal mixer and compression molding machine, respectively. ENR and glycerol were varied from 10 to 40 wt%. Effects of modifier types and contents on WG were evaluated by tensile, impact and water absorption testings and microstructure and thermal analyses. The increase of ENR or glycerol contents led to the increase of toughness by considering the increase of impact strength and elongation at break. Glass transition temperature of WG tended to decrease with the increase of ENR or glycerol contents, especially for glycerol. The presence of glycerol affected to the decomposition temperature values whereas ENR did not affect to decomposition. ENR improved water resistant of WG specimen but trend of glycerol showed the opposite behavior. Weight loss of modified WG with glycerol was found at immersion time of 1440 min.

Rheological properties of isotropic magnetorheological elastomers featuring an epoxidized natural rubber

2016 ◽  
Vol 25 (10) ◽  
pp. 107001 ◽  
Author(s):  
Nurul Azhani Yunus ◽  
Saiful Amri Mazlan ◽  
Ubaidillah ◽  
Seung-Bok Choi ◽  
Fitrian Imaduddin ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Rheological Properties ◽  
Epoxidized Natural Rubber ◽  
Magnetorheological Elastomers

Effect of Curing System on Morphological, Rheological, Thermal and Mechanical Properties of Thermoplastic Vulcanizates Based on Epoxidized Natural Rubber and Polypropylene

2012 ◽  
Vol 602-604 ◽  
pp. 690-695
Author(s):  
Hua Dong Wang ◽  
Rui Wang ◽  
Mao Fang Huang ◽  
Qi Yang
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Epoxidized Natural Rubber ◽  
Thermal And Mechanical Properties ◽  
Rheological Analysis ◽  
Elongation At Break ◽  
Thermoplastic Vulcanizates ◽  
Internal Mixer

Thermoplastic vulcanizates (TPVs) based on epoxidized natural rubber (ENR) and polypropylene (PP) were prepared in an internal mixer at 180°C. The effects of curing systems (i.e., sulfur and peroxide) on morphological, rheological, thermal and mechanical properties were studied. It is found that the sulfur cured TPVs show higher tensile strength, tear strength and elongation at break than those cured with the DCP systems. The rheological analysis indicates that TPVs cured with DCP system show lower apparent shear viscosity than those with sulfur system. SEM studies show that TPVs vulcanized with DCP system exhibit smaller and finely dispersed rubber domains, which provides it higher thermal stability than sulfur cured TPVs.

Effects of surface modification of halloysite nanotubes on the morphology and the thermal and rheological properties of polypropylene/halloysite composites

2018 ◽  
Vol 38 (2) ◽  
pp. 119-127 ◽  
Author(s):  
Xiaochun Yin ◽  
Liang Wang ◽  
Sai Li ◽  
Guangjian He ◽  
Zhitao Yang
Keyword(s):  
Thermal Stability ◽  
Fourier Transform ◽  
Rheological Properties ◽  
Thermal Analyses ◽  
Halloysite Nanotubes ◽  
Degree Of Crystallinity ◽  
Dynamic Shear ◽  
Extensional Deformation ◽  
Pp Composites ◽  
The Degree Of Crystallinity

AbstractEffects of unmodified halloysite nanotubes (HNTs) and hexadecyl trimethyl ammonnium bromide treated halloysite nanotubes (CTAB-HNTs) on the morphology as well as the thermal and rheological properties of the HNT-filled polypropylene (PP) composites were investigated. The composites were melt-blended with a novel vane mixer dominated by extensional deformation. Fourier transform infrared spectroscopy well demonstrated that ammonium molecules were successfully interacted with halloysite groups. Compared with unmodified HNTs, the modified HNTs had a better dispersion in the PP matrix. The degree of crystallinity increased with the introduction of HNTs into the PP matrix. Thermal analyses revealed that CTAB-HNTs can improve the composites’ thermal stability compared with unmodified HNTs. As for dynamic shear rheology, the PP/CTAB-HNT composites showed higher viscoelaticity than neat PP in most frequency regimes, and that the raw HNT/PP composites presented the opposite phenomenon. The relaxation time of PP melt and the availability of heterogeneous PP domains increased with the presence of CTAB-HNTs.

Effect of Temperature on Rheological Properties of Four Dental Restorative Materials

1973 ◽  
Vol 52 (6) ◽  
pp. 1216-1219 ◽  
Author(s):  
Anil M. Torgalkar
Keyword(s):  
Resonance Frequency ◽  
Rheological Properties ◽  
Effect Of Temperature ◽  
Acoustic Absorption ◽  
Temperature Dependent ◽  
Young’S Moduli ◽  
Dental Restorative Materials ◽  
Restorative Materials ◽  
Loss Coefficients ◽  
Dental Restorative

The effect of temperature on the rheological properties of four dental restorative materials was investigated at 26 to 60 C. Acoustic absorption was used to calculate loss coefficient, and resonance frequency was used to obtain Young's modulus. Young's moduli and loss coefficients of the restorative materials were temperature dependent.

Tensile Properties and Morphology of Recycled Latex Glove Filled Epoxidized Natural Rubber (ENR50) Compounds

2014 ◽  
Vol 660 ◽  
pp. 306-311
Author(s):  
A.A. Afiratul ◽  
N.Z. Noimam ◽  
C.M. Ruzaidi ◽  
Sung Ting Sam ◽  
M.F. Omar ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Tensile Properties ◽  
High Surface ◽  
Weight Ratio ◽  
Epoxidized Natural Rubber ◽  
Elongation At Break ◽  
Latex Glove ◽  
Roll Mill ◽  
Fine Size

The effects on the properties of recycled latex glove (RL-G) filled Epoxidized Natural Rubber (ENR 50) were studied. Both compounds were prepared by two roll mill at five different compositions of RL-G (5, 15, 25, 35 and 50 phr). The size range of RL-G particles i.e., S1 (300μm-700μm) and S2 (3cm-5cm) were used. The properties such as tensile properties (tensile strength, elongation at break, and stress at 100% elongation) and morphology studies were determined. The results indicated that the both size, S1 and S2 of recycled latex glove filled ENR 50 blends exhibited an increased in tensile strength and elongation at break for increasing weight ratio of RL-G. Scanning electron microscopy (SEM) of the fracture surfaces shows that the fine size, S1 RL-G/ENR50 exhibited high surface roughness and matrix tearing lines than the coarse size, S2 thus improving the compatibility of RL-G/ENR50 compounds. The results overall indicated that the fine size, S1of RL-G filled ENR50 contributed to the better properties such as tensile strength and surface morphology compared to the coarse size, S2 mainly at 15 phr of RL-G content.

scholarly journals Enhancement the Thermal Stability and the Mechanical Properties of Acrylonitrile-Butadiene Copolymer by Grafting Antioxidant

2010 ◽  
Vol 2010 ◽  
pp. 1-7 ◽  
Author(s):  
Abdulaziz Ibrahim Al-Ghonamy ◽  
A. A. El-Wakil ◽  
M. Ramadan
Keyword(s):  
Mechanical Properties ◽  
Thermal Stability ◽  
Natural Rubber ◽  
Ultrasonic Attenuation ◽  
Environmental Issues ◽  
Life Time ◽  
Roll Mill ◽  
Grafting Copolymerization ◽  
And Control ◽  
Better Than

Monomeric antioxidants are widely used as effective antioxidants to protect polymers against thermal oxidation. Low molecular weight antioxidants are easily lost from polymer through migration, evaporation, and extraction. Physical loss of antioxidants is considered to be major concern in the environmental issues and safety regulation as well as long life time of polymers. The grafting copolymerization of natural rubber ando-aminophenol was carried out by using two-roll mill machine. The prepared natural rubber-graft-o-Aminophenol, NR-graft-o-AP, was analysed by using Infrared and1-NMR Spectroscopy techniques. The thermal stability, mechanical properties, and ultrasonic attenuation coefficient were evaluated for NBR vulcanizates containing the commercial antioxidant, N-phenyl--naphthylamine (PBN), the prepared grafted antioxidant, NR-graft-o-AP, and the control vulcanizate. Results of the thermal stability showed that the prepared NR-graft-o-AP can protect NBR vulcanizate against thermal treatment much better than the commercial antioxidant, PBN, and control mix, respectively. The prepared grafted antioxidant improves the mechanical properties of NBR vulcanizate.

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