scholarly journals Manufacturing and Characterization of Green Composites with Partially Biobased Epoxy Resin and Flaxseed Flour Wastes

2020 ◽  
Vol 10 (11) ◽  
pp. 3688 ◽  
Author(s):  
Diego Lascano ◽  
Daniel Garcia-Garcia ◽  
Sandra Rojas-Lema ◽  
Luis Quiles-Carrillo ◽  
Rafael Balart ◽  
...  
Keyword(s):  
Particle Size ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Particle Interaction ◽  
Morphological Characterization ◽  
Polymer Particle ◽  
Absorption Capacity ◽  
Green Composites ◽  
Flaxseed Flour ◽  
The Matrix

In the present work, green-composites from a partially biobased epoxy resin (BioEP) reinforced with lignocellulosic particles, obtained from flax industry by-products or wastes, have been manufactured by casting. In this study, the flaxseed has been crushed by two different mechanical milling processes to achieve different particle sizes, namely coarse size (CFF), and fine size (FFF) particle flaxseed flour, with a particle size ranging between 100–220 µm and 40–140 µm respectively. Subsequently, different loadings of each particle size (10, 20, 30, and 40 wt%) were mixed with the BioEP resin and poured into a mold and subjected to a curing cycle to obtain solid samples for mechanical, thermal, water absorption, and morphological characterization. The main aim of this research was to study the effect of the particle size and its content on the overall properties of composites with BioEP. The results show that the best mechanical properties were obtained for composites with a low reinforcement content (10 wt%) and with the finest particle size (FFF) due to a better dispersion into the matrix, and a better polymer-particle interaction too. This also resulted in a lower water absorption capacity due to the presence of fewer voids in the developed composites. Therefore, this study shows the feasibility of using flax wastes from the seeds as a filler in highly environmentally friendly composites with a wood-like appearance with potential use in furniture or automotive sectors.

scholarly journals Materiale compozite pe baza de deseuri de beton celular autoclavizat si rasina poliesterica nesaturata

2019 ◽  
Vol 56 (1) ◽  
pp. 256-260
Author(s):  
Gelu Coman ◽  
Gabriel-Bogdan Carp ◽  
Ion Ion ◽  
Alina Ceoromila ◽  
Nicusor Baroiu
Keyword(s):  
Thermal Conductivity ◽  
Composite Material ◽  
Thermal Resistance ◽  
Water Absorption ◽  
Unsaturated Polyester ◽  
Absorption Capacity ◽  
Insulation Material ◽  
Water Absorption Capacity ◽  
The Matrix ◽  
Influence Of Water

This paper presents an experimental study on the potential use of new type of composite as insulation material. The composite material (AACW-UPR) was synthesised through mixture between the Autoclaved Aerated Concrete Waste (AACW) as filler and Unsaturated Polyester Resin (UPR) as matrix. Several samples of the composite material with different UPR concentrations (50 and 70 vol.%) and different AACW particle size (0.2-1 mm, 1.5-2.5 mm, 3-6 mm) were prepared. The thermal behaviour and the water absorption capacity of the AACW-UPR composite materials were studied. Also, the influence of water absorption capacity on thermal resistance and thermal conductivity was studied. During the investigations we noticed the following: good chemical compatibility between the AACW particles and the UPR matrix; a decrease in thermal conductivity for samples with 50 vol.% UPR and inserted particles size between 3-6 mm and an increase in water absorption capacity with the increase in the filler content in the matrix. The increasing water absorption capacity determined a decrease in thermal resistance and a reduction of the composite features as insulating material.

Study of the Impact of Rice Straw Particle Size on the Mechanical and Thermal Properties of Straw Lime Concretes

2022 ◽  
Author(s):  
Youssef El Moussi ◽  
Laurent Clerc ◽  
Jean-Charles Benezet
Keyword(s):  
Thermal Conductivity ◽  
Particle Size ◽  
Compressive Strength ◽  
Thermal Properties ◽  
Water Absorption ◽  
Rice Straw ◽  
Absorption Capacity ◽  
Mechanical And Thermal Properties ◽  
Water Absorption Capacity ◽  
The Impact

The use of bio-based concretes performed with lignocellulosic aggregates constitute an interesting solution for reducing the energy consumption, greenhouse gas emissions and CO2 generated by the building sector. Indeed, bio-based materials could be used as an alternative of traditional materials such as expended polystyrene and mineral resources (e.g. glass and rock wools) for insulation. Furthermore, these bio-based concretes are known for their interesting insulation properties, indeed they allow to enhance thermal properties of buildings and enables moisture management which lead to design efficient building materials. For this purpose, bio-based concrete using rice straw as aggregate are studied in this present work. The impact of the characteristics of rice straw particle (particle size distribution, bulk density, and water absorption capacity, etc.) on both the mechanical and thermal properties of the bio-based concrete are investigated. Five formulations of rice straw concrete are examined, compared and then classified in terms of insulation properties and mechanical properties. The assessments are based on the measurement of density and thermal conductivity. The variation of compressive strength in function of the characteristics (mean particle length) of rice straw particle are assessed and discussed. The investigation covers also the porosity and density. Tests are also carried out on agricultural by-products with a view to highlight their chemical, physical and structural proprieties. The results show that the use of large particles with low water absorption capacity induce lighter concretes with the density between 339 and 505 kg/m3 and lead to a high compressive strength with a high mechanical deformability. Furthermore, it appears that an increase in the average length of rice straw particle lead to decrease of thermal conductivity of bio-based concretes. It varies from 0.062 to 0.085 W/(m.K).

Effects of Thermal Cycling and Freezing after Water Absorption on Tensile Properties of Green Composites

2010 ◽  
Vol 150-151 ◽  
pp. 961-964
Author(s):  
Hyojin Kim ◽  
Masataka Sakiyama ◽  
Kenichi Takemura
Keyword(s):  
Tensile Strength ◽  
Thermal Cycling ◽  
Water Absorption ◽  
Tensile Properties ◽  
Thermal Fatigue ◽  
Room Temperature ◽  
Freezing Temperature ◽  
Freezing Process ◽  
Green Composites ◽  
The Matrix

The effects of thermal cycling and freezing after water absorption on tensile properties of green composites were examined. Jute fiber and matrix were used as the reinforcement and the matrix. The thermal fatigue was conducted as a fatigue test. Heating and freezing process are performed alternately for 0.5h, 1h and 24h during 10 cycles, heating and freezing temperature were 60 and -20 . In a freezing after water absorption, the damage by an expansion of water was examined. The freezing after the water absorption during 1-5 days was performed in a day under the environment of -20 . In thermal cycling, tensile strength and modulus were significantly decreased as the time passes. In 24h-treated test, the decrease rates of tensile strength and modulus were about 50 % compared with that of room temperature. In freezing after water absorption, tensile strength and modulus were decrease compared with that of the room temperature.

Influence of Compounds Contents and Particle Size on Some Functional Properties of Moringa oleifera Leaves (Lam) Powders

2021 ◽  
pp. 60-71
Author(s):  
Assiéné Agamou Julien Armel ◽  
Fombang Nig Edith ◽  
Mbofung Carl Moses
Keyword(s):  
Particle Size ◽  
Water Absorption ◽  
Bulk Density ◽  
Functional Properties ◽  
Water Solubility ◽  
Absorption Capacity ◽  
Water Absorption Capacity ◽  
Mature Leaves ◽  
Young Leaves ◽  
Moringa Oleifera Leaves

Objective: This study aims to determine the influence of the contents of compounds and particle size on the functional properties of leaves powders of M. oleifera. Methodology: The leaves were collected from three farms in the localities of Mbouda and Maroua and processed in powders. The proximate composition, some functional properties such as particle size, true Water Absorption Capacity (WACt), apparent Water Absorption Capacity (WACa), Water Solubility Index (WSI), Oil Holding Capacity (OHC), and Bulk density were determined. Results: The mean contents of young and mature leaves powders are 24.96 ± 0.29 and 23.13 ± 0.50 g/100 DM in total proteins; 34.26 ± 0.52 and 29.11 ± 1.44 g/100g DM in available carbohydrate, 8.34 ± 0.64 and 8.34 ± 0.68 g/100g DM in total lipids, 8.75 ± 0.74 and 9.08 ± 0.48 g/100g DM in total ash, 21.13 ± 1.34 and 27.14 ± 1.04 g/100g DM in total fibers, respectively. The particle size of powders is majority large. The fiber's contents significantly affect the increase of rehydration properties and the OHC, while the large particle size, the density. Values of WACt and WACa are 27.02 ± 0.20 and 32.88 ± 1.24 % in young leaves and 28.98 ± 0.15 and 35.88 ± 1.02 % in mature leaves, respectively. The WSI and OHC are 3.02 ± 0.06 and 257 ± 1% in young leaves and 3.5 ± 0.04 and 261 ± 2 % in mature leaves, respectively. The Bulk density is 0.42 ± 0.01 g/ml in young leaves and 0.39 ± 0.01 in mature leaves. Conclusion: Functional properties of M. oleifera leave powders do not always depend on the contents of compounds and particle size distribution.

scholarly journals Functional and Rheological Profile of LAB-fermented Bambara Groundnut (Vigna subterranean (L)) Flour

2021 ◽  
pp. 1-9
Author(s):  
C. O. Chude ◽  
C. C. Nwagbo ◽  
E. F. Okpalanma ◽  
B. O. Uba
Keyword(s):  
Particle Size ◽  
Water Absorption ◽  
Rheological Properties ◽  
Absorption Capacity ◽  
Bambara Groundnut ◽  
Water Absorption Capacity ◽  
Swelling Capacity ◽  
Flour Sample ◽  
Gelation Concentration

Lactic fermentation is commonly employed to improve protein digestibility and overall nutritional quality of grains foods. This study evaluated the functional and rheological properties of flour samples from Bambara groundnut fermented with Lactobacillus plantarum [NRRL B-4306] and Lactobacillus fermentum [NRRL B-1932] obtained from the United States Department of Agriculture. Functional profile such as particle size index, water absorption capacity, swelling capacity, and least gelation concentration of the flour were determined; as well, amylograph and maturograph evaluations were used to determine the rheological properties and the results presented as average, minimum, and maxi­mum values. Particle size determination observed that 150, 125, 105 µ orifice did not readily accommodate particles from the non-inoculated samples while the inoculated samples passed through 150 and 125 µ but did not readily pass through 105 µ orifice. Bioprocess with lactic acid bacteria increased the water absorption capacity of the flour samples from 346.5 to 386.4%, the least gelation concentration decreased from 5.3 to 4.1%, while swelling capacity increased from 14.9 to 23.2 mg/100 g for non-inoculated and inoculated flours, respectively. Rheological investigations show evaluations for amylograph and maturogram determinations. Values obtained for amylograph indicate that temperature at start of gelatinization was peak at 63.8 and 63.00C for non-fermented and LAB-fermented flour with no significant (p ˂ 0.05) difference, while temperature at maximum viscosity and maximum viscosity had significant (p ˂ 0.05) values of 92.1 and 76.00C, as well as 730 and 265 brabender units (BU), respectively. Thus, amylograph quality of the fermented flour sample was indicated by the maximum viscosity which is significantly higher in the case of non-inoculated flour sample. The maturograph evaluation also recorded the maturation behavior of the dough prepared from the test flours after the proofing time (fermentation rest) by means of a sensing probe which records the elasticity of the mature dough every 2 min and produces the typical zigzag form of the maturogram. This action was recorded in maturograph units (MU) on the strip-chart with values of 44 and 28 min for final proof time, 750 and 610 MU for dough level, 210 and 220 MU for dough elasticity, as well as 10 and 12 min for proofing stability, determined respectively for non-fermented and LAB-fermented flour samples. LAB-fermentation demonstrated to improve the functionality and rheology of Bambara groundnut flour and the production process could be further controlled to achieve products of optimal quality.

Sheath Bamboo Leaves Used at High Pressure Architect

2015 ◽  
Vol 668 ◽  
pp. 92-99
Author(s):  
Juliana Garcia ◽  
Vanderley Moacyr John
Keyword(s):  
Contact Angle ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Optical Microscopy ◽  
Castor Oil ◽  
Absorption Capacity ◽  
Water Absorption Capacity ◽  
Bamboo Leaves ◽  
Epoxy Resin Adhesive ◽  
Paper Format

Sheath bamboo leaves (SBL) are potential lignocelluloses waste, aimed to produce laminated architectonic coatings. In this work was studied the surface interaction among the SBL and three types of adhesive: Polyvinyl Acetate (PVAc), Castor oil Polyurethane Adhesive bi-component (Vegetal PU), Polyester Resin unsaturated bi-component (Polyester R.); through energy surface, by measuring water absorption capacity, contact angle and digital optical microscopy. The results showed that PU vegetal decrease the water absorption capacity showing a good adhesion at SBL surfaces, in comparison with PVAc and Epoxy resin. Contact angle tests showed that castor oil based PU Resin and Epoxy resin adhesive scattering well in the surface in comparison with water based adhesive like PVAc. Apparently, in the visual and aesthetic analysis by digital optical microscopy, PVAc let see the real SBL appearance, due to low reflectance.We shall be able to publish your paper in electronic form on our web page http://www.scientific.net, if the paper format and the margins are correct.Your manuscript will be reduced by approximately 20% by the publisher. Please keep this in mind when designing your figures and tables etc.

scholarly journals PENGARUH PENAMBAHAN BENTONIT TERMODIFIKASI SEBAGAI PENGISI TERHADAP SIFAT MEKANIK DAN PENYERAPAN AIR KOMPOSIT EPOKSI

2017 ◽  
Vol 5 (4) ◽  
pp. 39-44
Author(s):  
Alvian ◽  
Kenrick ◽  
Iriany
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Cetyltrimethylammonium Bromide ◽  
Absorption Capacity ◽  
Modified Bentonite ◽  
Maximum Value ◽  
Ftir Characterization ◽  
Scaning Electron Microscopy

Research about the application of modified bentonite as filler in epoxy has been done for the purpose of getting the best composition of modified bentonite as filler at epoxy composite to obtain the best mechanical properties such as tensile strength, impact strength and the water absorption. In this research, epoxy resin mixed with bentonite which have been modified using cetyltrimethylammonium bromide (CTAB) surfactant with various concentrations of 0,05M, 0,1M, and 0,15M. Modified bentonite filler and TiO2 then mixed with epoxy resin with various concentration of 5%, 10%, 15%, and 20% of filler from the total mass of the composite and then the composite was produced with hand lay-up method. The result of FTIR characterization showed that the bond between matrix and the filler produced was only interfacial bonding. The result of the mechanical properties test indicated that 5% of filler composition with 0,1M of surfactant concentration obtained the maximum value of tensile strength and mechanical strength respectively 33,667 MPa and 12564,9 J/m2. The result of mechanical properties test was supported by analysis of Scaning Electron Microscopy (SEM). On the test of water absorption, the water absorption capacity increased along with the increased of filler composition.

Effect of Water Absorption on the Mechanical and Dielectric Properties of Nano-Alumina Filled Epoxy Nanocomposites

2007 ◽  
Vol 334-335 ◽  
pp. 617-620 ◽  
Author(s):  
Hong Xia Zhao ◽  
Robert Kwok Yiu Li
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Water Absorption ◽  
Epoxy Resin ◽  
Tensile Tests ◽  
Alumina Nanoparticles ◽  
Al2o3 Nanoparticles ◽  
Epoxy Nanocomposites ◽  
Effect Of Water ◽  
The Matrix

Results on the effect of water absorption on the mechanical and dielectric properties of nano-size spherical alumina (Al2O3) filled epoxy are presented in this paper. The results from tensile tests indicate that incorporation of the Al2O3 nanoparticles into the epoxy can improve the stiffness of the matrix. DMA results show that the stiffness improvement is more pronounced at the rubbery region of the matrix. The alumina nanoparticles can increase the dielectric constant of the epoxy resin due to the increase in the total interfacial area. Upon water absorption, the mechanical properties of the alumina/epoxy nanocomposites decrease evidently, because of the damages induced by water on the epoxy resin. However, the ductility of epoxy can be improved by the water absorption process. In addition, the dielectric constant of the alumina/epoxy nanocomposites increased greatly after water absorption treatment.

scholarly journals Effect of Capillary Water Absorption on Electrical Resistivity of Concrete with Coal Gangue Ceramsite as Coarse Aggregates

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Dong Li ◽  
Shi Liu ◽  
Haiqing Liu
Keyword(s):  
Water Absorption ◽  
Absorption Capacity ◽  
Coal Gangue ◽  
Capillary Water ◽  
Capillary Suction ◽  
Capillary Action ◽  
Capillary Water Absorption ◽  
Coarse Aggregates ◽  
The Matrix ◽  
Water Transmission

This study intends to access the influence of the capillary action on electrical property of the concrete containing the coal gangue ceramsite. For this purpose, four kinds of concrete samples were prepared; the coal gangue ceramsite was adopted at four volume ratios of 0%, 30%, 60%, and 100%, respectively. The resistivity of the samples was explored using the two-electrode method during the capillary action. The effects of the coal gangue ceramsite contents on capillary water absorption capacity and resistivity of the matrix were verified. The variation of the resistivity of the matrix under the influence of capillary water transmission was analyzed. The results demonstrated that, for the unsaturated concrete, the resistivity of the matrix increased with the increment of the coal gangue ceramsite dosage. The electrical properties of the concrete were affected noticeably by the capillary water absorption of the matrix; the resistivity of the matrix dropped significantly under the capillary suction, which may be attributed to the formation of the new conductive channels caused by the absorbed water. The variation of the resistivity of the concrete under the capillary suction sustained the two-stage reduction curve. The ability of the capillary water absorption of concrete was enhanced with the addition of coal gangue ceramsite, compared to the traditional aggregates concrete, the initial sorptivity, and secondary sorptivity of the matrix increased by 47% and 16% with the 100% content of coal gangue ceramsite. However, during the process of the capillary suction, the resistivity of the coal gangue ceramic concrete was always greater than that of the concrete with traditional crushed aggregates.

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