Enhancing performances of hemp fiber/natural rubber composites via polyhydric hyperbranched polyester

2021 ◽  
Vol 41 (5) ◽  
pp. 404-412
Author(s):  
Zong Shen ◽  
Weihua Song ◽  
Xiaolong Li ◽  
Le Yang ◽  
Chaoyu Wang ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Interfacial Adhesion ◽  
High Performance ◽  
Rubber Matrix ◽  
Rubber Composites ◽  
Hemp Fiber ◽  
Elongation At Break ◽  
Cutting Resistance ◽  
Natural Rubber Composites ◽  
High Elasticity

Abstract High-performance rubber composites can be obtained by combining the strength of fiber with the high elasticity of rubber. In this article, environmentally friendly natural rubber (NR)/carbon (CB) composites reinforced by maleic anhydride (MAH) grafted hemp fiber (HF) in the presence of polyhydric hyper-branched polyester (PHP) were studied. The grafting of MAH on the surface of HF (HF-MAH) improves the roughness of fibers, the introduced C=C participates in rubber covulcanization with NR matrix at high temperature, thus enhancing the physical locking and chemical crosslinking between HF and NR matrix. The bridge effect was produced between HF-MAH and rubber matrix by PHP, and the interfacial adhesion was further enhanced. As a result, the tensile strength, tear strength, and elongation at break were improved by approximately 14.5, 26.2, and 10.8%, respectively. The 100 and 300% constant elongation stress was increased by 134 and 113%, and the cutting resistance was also improved obviously.

The Influence of Recycled Poly(ethylene Terephthalate) Powder on Fatigue Life, Thermal Stability, and Morphology of Halloysite Nanotubes (HNTs) and Precipitated Silica Filled Natural Rubber Composites

2011 ◽  
Vol 471-472 ◽  
pp. 628-633 ◽  
Author(s):  
H. Nabil ◽  
Hanafi Ismail ◽  
A.R. Azura
Keyword(s):  
Fatigue Life ◽  
Natural Rubber ◽  
Interfacial Adhesion ◽  
Halloysite Nanotubes ◽  
Volatile Matter ◽  
Rubber Matrix ◽  
Rubber Composites ◽  
Hybrid Filler ◽  
Degradation Temperature ◽  
Natural Rubber Composites

In this paper, the influence of recycled polyethylene terephthalate powder (R-PET) on fatigue life, thermal properties and micro-fracture surfaces of halloysite nanotubes (HNTs) and silica filled natural rubber composites have been studied. The total amount of hybrid filler in each formulation was kept constant at 20 parts per hundred rubber (phr). The final properties of HNTs/R-PET and Silica/R-PET compounds are considered separately and comparatively. Results indicated that the fatigue life of the natural rubber composites decreased with the replacement of these two fillers by R-PET powder. This observation might be due to the R-PET itself, which reduces the interfacial adhesion and wettability between rubber matrix and fillers. By replacing of HNTs and silica with R-PET powder, the thermal degradation of natural rubber composites was shifted to a lower temperature and the char residues was decreased, in which HNTs/R-PET composites expressed the higher temperature and char residues than silica/R-PET composites. This findings may be due to the HNTs/R-PET has less volatile matter than silica/R-PET that might enhance the degradation temperature of the natural rubber composites. SEM micrographs also exhibited weak interfacial adhesion when these two fillers were replaced with R-PET powder in NR composites.

scholarly journals Thermal, Morphological and Physic-Mechanical Properties of Natural Rubber - CaCO3 Composites Using Jatropha Oil as Softener.

2018 ◽  
Vol 156 ◽  
pp. 05016 ◽  
Author(s):  
Nasruddin ◽  
Tri Susanto
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Abrasion Resistance ◽  
Compositional Analysis ◽  
Critical Issue ◽  
Green Technology ◽  
Jatropha Oil ◽  
Rubber Composites ◽  
Elongation At Break ◽  
Natural Rubber Composites

The urgency of green technology in rubber compounding has become a critical issue recently. In this research, the effect of using renewable resources in rubber compounding has been studied. Commercial Calcium Carbonate, Silica and Jatropha Oil were used in natural rubber composite. The research was designed by varying the types of commercial filler namely CaCO3 (47-51) phr, silica (47-51) phr and Jatropha Oil (4-6) phr in natural rubber composites (SIR-20). The formulas were intentionally designed for rubber tips vulcanizates. The samples were characterized by the determination of physic-mechanical, thermal (TGA) and morphological (SEM) properties. From the measured results, there is no significant effect on the tensile strength, specific gravity, and hardness on the loading of commercial CaCO3 and Silica in natural rubber composites using Jatropha Oil. However, a slight difference in elongation at break and abrasion resistance could be detected. Compared to the commercial rubber tips, the rubber tips produced in this research have higher tensile strength, elongation at break and abrasion resistance. Due to the usage of commercial CaCO3 and Silica, the SEM micrographs show rough surface because of the agglomeration. The thermogram shows clearly the compositional analysis of the rubber tips vulcanizates consist of Jatropha Oil and natural rubber, CaCO3, ash and other filler residues such as Silica.

Tensile Properties of Wollastonite Filled High Density Polyethylene/Natural Rubber Composites

2015 ◽  
Vol 754-755 ◽  
pp. 215-219
Author(s):  
Ismail Yuhaida ◽  
Husseinsyah Salmah ◽  
Hanafi Ismail ◽  
Zainuddin Firuz
Keyword(s):  
Tensile Strength ◽  
Natural Rubber ◽  
Tensile Properties ◽  
High Density Polyethylene ◽  
High Density ◽  
Inorganic Filler ◽  
Rotor Speed ◽  
Rubber Composites ◽  
Elongation At Break ◽  
Natural Rubber Composites

Wollastonite is one type of inorganic filler. The effects of wollastonite loading on tensile properties of wollastonite (WS) filled high density polyethylene (HDPE)/Natural Rubber (NR) composites was studied. The HDPE/NR/WS composites were prepared by using Brabender EC Plus at a temperature of 180 °C with rotor speed of 50 rpm for 10 min. It was found that the increasing of wollastonite loading had decreased the tensile strength and elongation at break, whereas the Young’s modulus of the HDPE/NR/WS composites had increased with the increasing of wollastonite loading.

Cogon Grass Fiber-Epoxidized Natural Rubber Composites

2013 ◽  
Vol 747 ◽  
pp. 375-378 ◽  
Author(s):  
Chaiwat Ruksakulpiwat ◽  
Wasaphon Wanasut ◽  
Apikiat Singkum ◽  
Ruksakulpiwat Yupaporn
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Natural Rubber ◽  
Acid Treatment ◽  
Treatment Time ◽  
Treatment Method ◽  
Epoxidized Natural Rubber ◽  
Rubber Composites ◽  
Elongation At Break ◽  
Natural Rubber Composites

This research shows a great potential of cogon grass fiber to be used as a reinforcement in epoxidized natural rubber composites. The thermal and mechanical properties of cogon grass fiber-epoxidized natural rubber composites were studied. The chemical treatment of cogon grass fiber to be used as a reinforcing filler was revealed. Effects of fiber treatment method and treatment time of cogon grass fiber on thermal properties of the fibers and their composites were elucidated. The addition of cogon grass fiber into epoxidized natural rubber (ENR) improved the mechanical properties of the composites.The result indicated that alkaline treatment followed by acid treatment of cogon grass fiber led to an increase in thermal decomposition temperature and mechanical properties of the composites more than that without acid treatment. With increasing the amount of fiber, tensile strength of ENR composites were significantly increased while elongation at break was insignificantly changed. ENR with the addition of 4-Amino-6-hydroxy-2-mercaptopyrimidine monohydrate as coupling agent (ENRC) was shown to have higher tensile strength, modulus at 200% elongation and elongation at break than ENR. Improved mechanical properties were also obtained in ENRC composites compared to those of ENR composites.

scholarly journals Mechanical Properties of Phormium Tenax Reinforced Natural Rubber Composites

Fibers ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 11
Author(s):  
Sivasubramanian Palanisamy ◽  
Kalimuthu Mayandi ◽  
Murugesan Palaniappan ◽  
Azeez Alavudeen ◽  
Nagarajan Rajini ◽  
...  
Keyword(s):  
Natural Rubber ◽  
Tensile Elongation ◽  
Natural Fibers ◽  
Rubber Composites ◽  
Elongation At Break ◽  
Roll Mill ◽  
Natural Rubber Composites ◽  
Mechanical Tensile ◽  
American Society ◽  
Tear Properties

The introduction of natural fibers as a filler in a natural rubber (NR) matrix can be of relevance for their eco-friendly and sustainable nature as the substitute for carbon-based fillers. In this work, short Phormium tenax fibers were introduced in random orientation into a NR matrix in different lengths (6, 10, and 14 mm) and various amounts (10, 20, and 30%, taking 100 as the NR weight). The composite was fabricated using a two-roll mill according to American Society for Testing and Materials (ASTM) D3184-11 standard. Several properties were determined, namely tensile and tear characteristics, hardness, and abrasion resistance. The results suggest that the shortest fiber length used, 6 mm, offered the best combination between loss of mechanical (tensile and tear) properties and hardness and the most acceptable resistance to abrasion, with the properties increasing with the amount of fibers present in NR. As a consequence, it is indicated that a higher amount of fibers could be possibly introduced, especially to achieve harder composites, though this would require a more controlled mixing process not excessively reducing tensile elongation at break.

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