Thermal Characterization of Polyurethane from Castor Oil Reinforced Sugarcane Straw Composites

2011 ◽  
Vol 415-417 ◽  
pp. 1103-1106
Author(s):  
Patricia Câmara Miléo ◽  
George Jackson de Moraes Rocha ◽  
Adilson Roberto Gonçalves
Keyword(s):  
Castor Oil ◽  
Thermal Characterization ◽  
Natural Fibre ◽  
Cellulose Fibres ◽  
Sugarcane Straw ◽  
The Matrix ◽  
One Step ◽  
Polyurethane Composites ◽  
Environmental Interests

The development in the area of natural-fibre-reinforced composites has greatly increased in recent years. Using castor oil polyurethane (PU) as matrix for composites reinforced with lignin and cellulose from sugarcane straw is in tune with economical and environmental interests. The aim of this work was the thermal degradation study of castor oil-polyurethane composites reinforced with cellulose from sugarcane straw. For the obtainment of cellulose, sugarcane straw was pretreated by steam explosion, followed by a delignification with NaOH. For the production of the PU, the polyol (castor oil) to diisocyanate mass ratio was 1.5:1.0. Reinforcement of the matrix was done changing the concentration of cellulose fibres (5,10,15,20% w/w). Thermogravimetric analysis of the materials was carried out. The results obtained showed that the process of decomposition of the matrix occurs in one step, while for the composites it occurs in two steps. The addition of reinforcement in the matrix basically did not change the thermal stability of the composite.

Evaluation of Castor Oil Polyurethane Reinforced with Lignin and Cellulose from Sugarcane Straw

2010 ◽  
Vol 123-125 ◽  
pp. 1143-1146 ◽  
Author(s):  
Patrícia Câmara Mileo ◽  
Matheus F. De Oliveira ◽  
Sandra M. Luz ◽  
George J.M. Rocha ◽  
Adilson Roberto Gonçalves
Keyword(s):  
Castor Oil ◽  
Cellulose Fibers ◽  
Material Behavior ◽  
Promising Alternative ◽  
Sem Micrographs ◽  
Sugarcane Straw ◽  
Pure Matrix ◽  
The Matrix ◽  
Polyurethane Composites ◽  
Polyurethane Matrix

The search for materials from renewable sources such as vegetable oil-based polymers, polyurethane based on castor oil represents a promising alternative in researches. Using castor oil polyurethane as matrix for composites reinforced with lignin and cellulose from sugarcane straw is in tune with economical and environmental interests. The objective of this work was the evaluation of the changes on the structure and thermal behavior of castor oil polyurethane composites reinforced with lignin and cellulose from sugarcane straw. The cellulose and lignin were extracted from the straw by acid hydrolysis and then they were milled. For the production of the polyurethane, the mass reason between polyol (castor oil) and diisocyanate was 1.5:1.0. Reinforcement of the matrix was done changing the concentration of cellulose and lignin. SEM micrographs of fractured surfaces of the obtained composites and thermal analysis (TGA) were done. No lignin could be seen in SEM micrographs, what suggests a blend material behavior. The addition of cellulose fibers (30%) and lignin (40%) to the polyurethane matrix has caused an increase of the stiffness in the resulting composite when compared with the pure matrix. Above these rates, stiffness decreases. The presence of lignin or cellulose fibers in polyurethane matrix seems to increase mechanical properties of the composite, and also introduce better thermal stability than the pure matrix. Its presence might also bring other significant synergetic properties to the final composite, what has currently been studied. At the same time, the blend behavior of Polyurethane-Lignin composites has been investigated.

Development and characterization of novel castor oil-based polyurethane composites containing wood sawdust and rubber tire powder

2020 ◽  
pp. 096739112093966
Author(s):  
Rodrigo Konzen Seibel ◽  
André Zimmer ◽  
Rudinei Fiorio
Keyword(s):  
Castor Oil ◽  
Modulus Of Rupture ◽  
Flexural Properties ◽  
Thickness Swelling ◽  
Rubber Content ◽  
Wood Sawdust ◽  
Rubber Tire ◽  
Polyurethane Composites ◽  
Wood Content

New eco-friendly composites consisting of castor oil-based polyurethane (PU) resin, wood sawdust, and rubber tire powder were produced, and the morphological, physical, and flexural properties were investigated. The composites were composed of varying the concentration of the PU matrix (30, 40, and 50 m%) and the wood-to-rubber ratio of the disperse phase (100/0, 90/10, 80/20, 70/30, 60/40, and 50/50 m%/m% wood/rubber, respectively). The morphology of the composites was studied by optical microscopy and scanning electron microscopy, and the flexural properties, water absorption (WA), and thickness swelling (TS) were also investigated. The analysis of variance was used to study the effect of each factor (PU content and wood/rubber ratio) on the characteristics of the composites. PU/wood/rubber composites were successfully molded and their characteristics are promising for commercial use. According to the results, the composites presenting higher wood content (high wood/rubber ratio) showed higher modulus of rupture and modulus of elasticity values, although the addition and the increase of rubber content decreased these properties. Moreover, increasing PU or reducing the wood/rubber ratio significantly reduced the WA and TS, improving dimensional stability.

scholarly journals Physical and Thermal Characterization of Alkali Treated Rice Husk Reinforced Polypropylene Composites

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Ismat Zerin Luna ◽  
Krishna Chandra Dam ◽  
A. M. Sarwaruddin Chowdhury ◽  
Md. Abdul Gafur ◽  
Nuruzzaman Khan ◽  
...  
Keyword(s):  
Rice Husk ◽  
Sodium Hydroxide Solution ◽  
Thermal Characterization ◽  
Sem Analysis ◽  
Morphological Properties ◽  
Electron Microscopic ◽  
Polypropylene Composites ◽  
The Matrix ◽  
The Fourier Transform

Rice husk (RH) reinforced polypropylene- (PP-) based composites were prepared by compression molding. The RH was treated with sodium hydroxide solution (1 wt%); then composites were prepared using varying percentages of RH (5 to 20 wt%). The thermomechanical, spectroscopic, and morphological properties of the prepared composites (RH-PP) were investigated. The scanning electron microscopic (SEM) analysis showed better interfacial adhesion between alkali treated RH and the matrix PP. The Fourier Transform Infrared (FTIR) spectra confirmed the chemical bonding.The results revealed that physical properties as well as thermal stability of the composites improved significantly with the addition of alkali treated RH in PP matrix.

scholarly journals Structural and Thermal Characterization of Castor Oil Based Unsaturated Polyester Resin

2020 ◽  
Vol 32 (7) ◽  
pp. 1763-1767
Author(s):  
A. Chowdhury ◽  
S.K. Singh ◽  
P. Anthony
Keyword(s):  
Castor Oil ◽  
1H Nmr Spectroscopy ◽  
Polyester Resin ◽  
Unsaturated Polyester ◽  
Thermal Characterization ◽  
Decomposition Temperature ◽  
Unsaturated Polyester Resin ◽  
Polyester Resins ◽  
Thermal Stability Of

In the present study, unsaturated polyester resins based on castor oil was synthesized. Structure elucidation of the synthesized unsaturated polyester resin was done by FTIR and 1H NMR spectroscopy. Thermogravimetric analysis was used to evaluate the thermal stability of cured unsaturated polyester resin. Thermogram plot was further utilized to calculate various other parameters such as statistic heat-resistant index (Ts) and the integral procedural decomposition temperature (IPDT). Comparable properties with respect to commercial resins were reported for the synthesized polymers

Microstructural and Thermal Characterization of Copper Based Composites for Thermal Management in Electronic Packaging

2014 ◽  
Vol 976 ◽  
pp. 148-153 ◽  
Author(s):  
Carlos Alberto León ◽  
Gabriel Rodríguez-Ortiz ◽  
E.A. Aguilar-Reyes ◽  
Makoto Nanko ◽  
M. Takeda
Keyword(s):  
Electronic Packaging ◽  
Coefficient Of Thermal Expansion ◽  
Thermal Characterization ◽  
Electroless Copper Plating ◽  
Pulsed Electric Current ◽  
Alumina Particles ◽  
The Matrix ◽  
Materials Used ◽  
Thermo Physical Properties

Copper based composites with 30, 40, 50 and 60 vol.% Al2O3 were fabricated by powder metallurgy and consolidated by pulsed electric current sintering (PECS). For the purpose of determining the advantage of using coated fillers, composite alumina particles with 18 vol.% copper were prepared by electroless copper plating. Coatings were continuous and homogeneous through alumina surface. Thus, composites consolidated by the modified process increased contact between the matrix and filler, which resulted in superior thermo-physical properties. Thermal conductivities of 210-99 and 227-114 W/mK were obtained for Cu/Al2O3 made by the admixture and the coated filler method, respectively. Such superiority is mainly attributed to the continuity in the matrix phase; the thermal conductivity values observed are similar to those shown by the traditional materials used in electronic packaging. The coefficient of thermal expansion was slight lower in composites fabricated by the coated filler method; values in the ranges of 14-11 and 13-10.5 μm/m°C were obtained for the admixture and the coated filler method, respectively.

scholarly journals Thermal characterization of castor oil as additive in lubricant oil using photothermal techniques

2018 ◽  
Vol 31 (1) ◽  
pp. 6-9
Author(s):  
G. Lara-Hernandez ◽  
J.C. Benavides-Parra ◽  
Alfredo Cruz-Orea ◽  
E. Contreras-Gallegos ◽  
C. Hernández-Aguilar ◽  
...  
Keyword(s):  
Automobile Industry ◽  
Castor Oil ◽  
Thermal Characterization ◽  
Partial Substitution ◽  
Oil Blends ◽  
Oil Additives ◽  
Lubricant Oil ◽  
Thermal Diffusivities ◽  
Commercial Lubricant

Over the last years extensively research has been carried out on full or partial substitution of supplies resources coming from renewable resources on traditionally non-renewable, in the case of the automobile sector there are progresses in bio-combustibles (biofuel) and synthetic oils coming from vegetable sources. There are strong efforts to find oil additives which can improve oils features in automobile industry, by adding vegetables oils to commercial lubricant oils, is expected to improve oil thermal stability.  In the present research, different ratios of castor oil (ricinus comunis)-motor oil blends were obtained and their thermal properties were characterized by using the so-called Back and Front Photopyroelectric (BPPE/FPPE) techniques. Several oil-additives concentrations were measured and thermal diffusivities and effusivities as well as densities are reported, getting full thermal characterization for every concentration. 

SYNTHESIS AND CHARACTERIZATION OF NATURAL FIBRE REINFORCED POLYURETHANE COMPOSITES BASED ON CARDANOL

2015 ◽  
Vol 1 (01) ◽  
pp. 42-47 ◽  
Author(s):  
Y. Jasmala Joy ◽  
Robin Kumar Samuel ◽  
Dr A Malar Retna
Keyword(s):  
Renewable Resources ◽  
Raw Materials ◽  
Acid Catalyst ◽  
Natural Fibre ◽  
Dibutyltin Dilaurate ◽  
Sisal Fibre ◽  
Physico Chemical ◽  
High Impact Strength ◽  
Polyurethane Composites

In recent studies importance has been given to the use of natural products from renewable resources due to the decrease in the supply and price escalations of petroleum raw materials. Cardanol based resole type phenolic resin has been synthesized by condensing cardanol with furfural in a particular mole ratio using dicarboxylic acid catalyst such as phthalic acid. Polyurethane sheets were prepared by treating cardanol furfural resin with 4,41 – methylene bis(cyclohexyl isocyanate)  and the catalyst dibutyltin dilaurate. Natural fibres are prospective reinforcing materials and their use until now has been more traditional than technical.  Among the various fibres sisal is of particular interest in that its composites have high impact strength besides having moderate tensile and flexural properties compared to other fibres.  Fibre reinforced polyurethane composites have been prepared by treating sisal fibre  (10%) into polyurethane. The physico chemical, spectral and thermal properties of polyurethane and fibre reinforced polyurethane composites have been studied.

scholarly journals The Effect of Jackfruit Skin Powder and Fiber Bleaching Treatment in PLA Composites with Incorporation of Thymol

Polymers ◽  
2020 ◽  
Vol 12 (11) ◽  
pp. 2622
Author(s):  
Muhammad Najib Ahmad Marzuki ◽  
Intan Syafinaz Mohamed Amin Tawakkal ◽  
Mohd Salahuddin Mohd Basri ◽  
Siti Hajar Othman ◽  
Siti Hasnah Kamarudin ◽  
...  
Keyword(s):  
Food Packaging ◽  
Fibre Composite ◽  
Low Cost ◽  
Thermal Characterization ◽  
Natural Fibre ◽  
Poly Lactic Acid ◽  
Tropical Fruit ◽  
Fibre Composites ◽  
The Matrix ◽  
Bleaching Treatment

Food packaging has seen a growth in the use of materials derived from renewable resources such as poly(lactic acid) (PLA). However, the initial costs to produce bioplastics are typically high. Tropical fruit waste as naturally sourced fibres, such as jackfruit skin, can be used as a cost-reducing filler for PLA. The main objective in this study is to fabricate a low-cost natural fibre-reinforced polymer that potentially applies in packaging with the aid of bleaching treatment. The treatment shows a rougher surface fibre in Scanning electron microscopy (SEM) micrographs and it is expected to have better mechanical locking with the matrix, and this is found similar with a Fourier-transform infrared spectroscopy (FTIR) analysis. Unfortunately, fibre insertion does find low tensile performances, yet bleached-fibre composites improved its performance significantly. A similar situation was found in the thermal characterization where a low-thermal stability natural fibre composite has lower thermal behaviour and this increased with bleaching treatment. Besides, bleached-fibre composites have a longer service period. Besides, a 15 wt% thymol insertion inhibits the growth of Gram-positive bacteria in the composites and the non-treated fibre composite has better thymol effects. The 30 wt% of the bleached-fibre insertion composite has a high potential to reduce the cost of bioplastic products with minimum alterations of overall performances.

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