Properties of Rice Husk Ash Silica Filled Prevulcanized Deproteinized Natural Rubber Latex Film

2017 ◽  
Vol 757 ◽  
pp. 57-61
Author(s):  
Panjaporn Wongwitthayakool ◽  
Su Geun Yang ◽  
Jitpimon Siripanth ◽  
Chomsri Siriwong ◽  
Thanunya Saowapark
Keyword(s):  
Natural Rubber ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Natural Rubber Latex ◽  
Latex Film ◽  
Damping Factor ◽  
Dynamic Mechanical ◽  
Sem Image ◽  
Si Content ◽  
Deproteinized Natural Rubber

Silica extracted from rice husk ash (RHA-Si) was incorporated in deproteinized natural rubber (DPNR) latex compounds up to 20 phr. The cast films were prepared after the prevulcanization at 70°C for 2 hours. The effect of RHA-Si loading on swelling and tensile properties was investigated. Scanning electron microscope (SEM) was used to examine morphology of the prevulcanized films. Dynamic mechanical behaviors of filled prevulcanizates were studied using the dynamic mechanical analyzer (DMA). Two types of tests, namely, temperature sweep and strain sweep test were performed. Swelling test revealed the decrease in crosslink density with increasing RHA-Si loading more than 10 phr. Tensile strength and elongation at break decreased with increasing RHA-Si loading. Conversely, the presence of RHA-Si increased the modulus at 100% strain of the prevulcanized DPNR latex films. The poor filler-rubber distribution was evidenced by SEM image. The DMA results exhibited that storage modulus (G′) and damping factor (tanδ) increased with increasing RHA-Si loading. The narrow linear viscoelastic (LVE) region was noticed for prevulcnizates filled with high RHA-Si content. Glass transition temperature (Tg) of highly filled DPNR shift to low temperature.

Enhancing Properties of Deproteinized Natural Rubber with Rice Husk Ash Silica for Use as a Dental Material

2016 ◽  
Vol 675-676 ◽  
pp. 564-568 ◽  
Author(s):  
Thanunya Saowapark ◽  
Ukrit Amphaiphan ◽  
Ekrachan Chaichana ◽  
Panjaporn Wongwitthayakool
Keyword(s):  
Natural Rubber ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Dental Materials ◽  
Natural Rubber Latex ◽  
Agricultural Residues ◽  
Dental Material ◽  
Main Element ◽  
X Ray ◽  
Deproteinized Natural Rubber

Rice husk is an agricultural residue from a rice-mill known as a rich source of silica. In this study, the rice husk was extracted for the contained silica by pretreatment with hydrochloric and calcination at 700 °C, and the white rice husk ash (WRA) mainly consisting of the silica was finally obtained. WRA was then investigated for its composition and structure with X-ray fluorescence (XRF) and X-ray diffractometer (XRD). The results showed that WRA contained a large amount of silica (90%) with amorphous structure. After that, WRA was used as filler for the preparation of natural rubber products. Two kinds of the natural rubber products were prepared here: 1) the pure natural rubber (PNR) product and 2) the deproteinized natural rubber (DNR) product. DNR was a protein removal natural rubber which is suitable for use as a dental material with the low allergenic properties caused from the proteins. Additionally, DNR used in this study could be provided by removing proteins from the natural rubber latex with 0.1 % urea in the presence of surfactant at room temperature. It was found that the nitrogen content (main element of proteins) of DNR was lower than PNR under the test condition. For the preparation of natural rubber products, WRA was mixed into the PNR and DNR latexes comparing with the commercial silica (Hisil-233). All finished latexes were compounded to obtain the natural rubber products. The viscoelastic properties and the cure characteristics of the entire products were investigated. It can be observed that WRA can be comparable with the commercial silica for use as filler for the natural rubber products. This is an attractive option to produce dental materials from the agricultural residues, which will reduce the cost of the production and also add value to the agricultural residues.

Mechanical and dynamic mechanical properties of rice husk ash-filled natural rubber compounds

2002 ◽  
Vol 83 (11) ◽  
pp. 2331-2346 ◽  
Author(s):  
H. M. Da Costa ◽  
L. L. Y. Visconte ◽  
R. C. R. Nunes ◽  
C. R. G. Furtado
Keyword(s):  
Mechanical Properties ◽  
Natural Rubber ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Dynamic Mechanical Properties ◽  
Dynamic Mechanical ◽  
Rubber Compounds

Fabrication of Rice Husk Ash/Natural Rubber Composite

2011 ◽  
Vol 393-395 ◽  
pp. 92-96 ◽  
Author(s):  
Zong Qiang Zeng ◽  
He Ping Yu ◽  
Hong Chao Liu ◽  
Shuang Quan Liao ◽  
Zheng Peng
Keyword(s):  
Mechanical Properties ◽  
Rare Earth ◽  
Natural Rubber ◽  
Rice Husk ◽  
Coupling Agent ◽  
Rice Husk Ash ◽  
Testing Machine ◽  
Dynamic Mechanical Properties ◽  
Main Trend ◽  
Dynamic Mechanical

The preparation of rubber-based composite from agricultural by-product is the main trend to upgrade the performance of rubber and reduce the cost. In this work, the rice husk ash/natural rubber (RHA/NR) composites were prepared by latex mixing process using the RHA modified with rare earth coupling agent. The mechanical properties, dynamic mechanical properties, thermal stability and morphology of RHA/NR composites were analyzed by universal testing machine, dynamic mechanical analyzer, thermo gravimetric analyzer and scanning electron microscope. The results indicate that previous modification of RHA with rare earth coupling agent can improve the dispersion of RHA in NR matrix significantly and increase the interaction between RHA particles and NR matrix and thus upgrade the mechanical properties and anti-oxidative behaviors of RHA/NR composite. The RHA/NR composite of highest mechanical properties and anti-oxidative behaviors can be obtained with a RHA loading of 4 per hundred rubber.

Physical and Mechanical Properties of Cement/Natural Rubber Latex/Rice Husk Ash Composites

2015 ◽  
Vol 804 ◽  
pp. 124-128
Author(s):  
Nittaya Jaitanong ◽  
Tanapong Chaipunti
Keyword(s):  
Mechanical Properties ◽  
Portland Cement ◽  
Natural Rubber ◽  
Rice Husk ◽  
Rice Husk Ash ◽  
Natural Rubber Latex ◽  
Physical And Mechanical Properties ◽  
Ammonia Solution ◽  
Rubber Latex ◽  
Cement Ratio

The microstructure and mechanical properties of Portland cement (PC)- natural rubber latex (NRL)- rice husk ash (RHA) composites have been investigated. The proportions of PC-NRL-RHA composites with NRL to cement ratio (NRL/C) that use in this experiment were 0, 0.10, 0.15 and 0.20 respectively. Portland cement (PC) was partially replaced with rice husk ash at 20% by weight of binder. The rice husk ash (RHA) was ground for 180 minutes before using. Water to cement ratio (W/C) equal of 0.5 by weight not include water in NRL. Nonionic surfactant was added in cement before mixed with NRL. In addition, to provide latex from natural rubber, the ammonia solution is added into natural rubber. The specimens were casting in standard mold which samples size of 50x50x50 and 40x40x160 mm3 respectively. Moreover, the PC-NRL-RHA composites were cured in water for 3, 7 and 28 days at room temperature before measurement. Then, mechanical properties (compressive strength and flexural strength) and microstructure were studied.

Chitin nanocrystals reticulated self‐assembled architecture reinforces deproteinized natural rubber latex film

2020 ◽  
Vol 137 (39) ◽  
pp. 49173 ◽  
Author(s):  
Jiarui Hu ◽  
Xiaohui Tian ◽  
Jinyu Sun ◽  
Jianyong Yuan ◽  
Yizhong Yuan
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Latex Film ◽  
Rubber Latex ◽  
Self Assembled ◽  
Deproteinized Natural Rubber

Novel membranes from physico-chemically modified deproteinized natural rubber latex: development, characterisation and drug permeation

2018 ◽  
Vol 42 (17) ◽  
pp. 14179-14187
Author(s):  
Janisha Jayadevan ◽  
G. Unnikrishnan
Keyword(s):  
Drug Release ◽  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Rubber Latex ◽  
Drug Permeation ◽  
Chemically Modified ◽  
Blend Membranes ◽  
Deproteinized Natural Rubber

Novel blend membranes from physico-chemically modified deproteinized natural rubber latex for drug release applications.

scholarly journals Physicochemical, Thermomechanical, and Swelling Properties of Radiation Vulcanised Natural Rubber Latex Film: Effect of Diospyros peregrina Fruit Extracts

2013 ◽  
Vol 2013 ◽  
pp. 1-8
Author(s):  
Kazi Md Zakir Hossain ◽  
Nashid Sharif ◽  
N. C. Dafader ◽  
M. E. Haque ◽  
A. M. Sarwaruddin Chowdhury
Keyword(s):  
Natural Rubber ◽  
Natural Rubber Latex ◽  
Tensile Modulus ◽  
Decomposition Temperature ◽  
Latex Film ◽  
Cross Linking ◽  
Rubber Latex ◽  
Swelling Properties ◽  
Fruit Extracts ◽  
Control Film

A range of radiation vulcanised natural rubber latex (RVNRL) films were prepared using various concentrations of aqueous extracts of mature Diospyros peregrina fruit, which acted as a cross-linking agent. The surface of the RVNRL films exhibited an aggregated morphology of the rubber hydrocarbon with increasing roughness due to increasing fruit extract contents in the latex. An improvement in tensile strength, tensile modulus, and storage modulus of RVNRL films was observed with the addition of fruit extracts compared to the control film due to their cross-linking effect. The glass transition (Tg) temperature of all the RVNRL films was found to be at around −61.5°C. The films were also observed to be thermally stable up to 325°C, while the maximum decomposition temperature appeared at around 375°C. The incorporation of fruit extracts further revealed a significant influence on increasing the crystallinity, gel content, and physical cross-link density of the RVNRL films.

Tensile Properties and Dynamic Mechanical Behaviour of Natural Rubber Compound Filled with Rice Husk Silica Produced via Solvent-Thermal Extraction Method

2019 ◽  
Vol 947 ◽  
pp. 195-199
Author(s):  
Zainathul Akhmar Salim Abdul Salim ◽  
Aziz Hassan ◽  
Hanafi Ismail ◽  
Nor Hafizah Che Ismail
Keyword(s):  
Natural Rubber ◽  
Tensile Properties ◽  
Rice Husk ◽  
Mechanical Behaviour ◽  
Extraction Method ◽  
Silica Content ◽  
Rice Husk Silica ◽  
Dynamic Mechanical ◽  
Thermal Extraction ◽  
Rubber Filler

This study highlighted the effect of incorporation of rice husk silica (RHS) on the tensile properties and dynamic mechanical behaviour of natural rubber (NR) compounds. High purity RHS was synthesised by solvent-thermal extraction method, which was inspired by TAPPI T204 cm-97 and TAPPI T264 cm-97 standards with some modifications. The extraction method had successfully produced RHS with 99.9% of silica content and surface area of 234.25 m2/g. The incorporation of RHS in NR showed increment in tensile properties compared to unfilled NR. Further improvement was recorded by surface modification of RHS with 1 wt. % bis (triethoxysilylpropyl) tetrasulfide (TESPT). The modification of RHS with TESPT increased the rubber-filler interaction between RHS and NR matrix, hence enhancing the strength-related properties. The modified RHS-NR also recorded highest storage modulus, and the presence of RHS in the NR compound had slightly shifted the glass transition temperature (Tg) to a higher value. This confirmed that the strong rubber-filler interaction had increased the rigidity of the compounds and restricted the mobility of the rubber chains.

Sign in / Sign up

Export Citation Format

Share Document