scholarly journals Morphology, Thermal, and Mechanical Characterization of Bark Cloth from Ficus natalensis

ISRN Textiles ◽  
2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Samson Rwawiire ◽  
George William Luggya ◽  
Blanka Tomkova
Keyword(s):  
Thermal Behavior ◽  
Cellulose Degradation ◽  
Nonwoven Material ◽  
Alkaline Treatment ◽  
Scanning Calorimetry ◽  
Cultural Organization ◽  
Degradation Temperature ◽  
Intangible Heritage ◽  
Exploratory Investigation

The United Nations Educational, Scientific and Cultural Organization (UNESCO) proclaimed in 2005 that Ugandan bark cloth is largely produced from mutuba tree (Ficus natalensis) as a “Masterpiece of the Oral and Intangible Heritage of Humanity.” An exploratory investigation of bark cloth a nonwoven material produced through a series of pummeling processes from mutuba tree in Uganda is fronted as a prospective engineering natural fabric. Bark cloth was obtained from Ficus natalensis trees in Nsangwa village, Buyijja parish in Mpigi district, Central Uganda. The morphology of the fabric was investigated using scanning electron microscope (SEM). thermal behavior of the fabric was studied using thermagravimetric analysis (TGA) and differential scanning calorimetry (DSC). Fourier transform infrared spectroscopy was used to evaluate the surface functional groups. The fabric was subjected to alkaline treatment for six hours at room temperature in order to study the change in fabric thermal properties so as to set a base for applications in biodegradable composites. Findings show that the natural nonwoven fleece is stable below 200°C; alkaline treatment positively influences the thermal behavior by increasing the onset of cellulose degradation temperature. The fabric morphology showed that it is made up of fairly ordered microfibers which can be beneficial for nanocomposites.

Characterization of Thermal Behavior of Epoxy Composites Reinforced With Curaua Fibers by Differential Scanning Calorimetry

2016 ◽  
pp. 403-407
Author(s):  
A. Barcelos Mariana ◽  
D. Ribeiro Carolina Gomes ◽  
Jordana Ferreira ◽  
S. Vieira Janaina da ◽  
M. Margem Frederico ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Behavior ◽  
Epoxy Composites ◽  
Scanning Calorimetry ◽  
Curaua Fibers

Synthesis and Characterization of the Bismaleimides Containing Aliphatic-ether Chain for Microelectronics Application

e-Polymers ◽  
2006 ◽  
Vol 6 (1) ◽  
Author(s):  
J. L. Feng ◽  
C. Y. Yue ◽  
K. S. Chian
Keyword(s):  
Chain Length ◽  
Thermo Gravimetric Analysis ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Thermo Gravimetric ◽  
Degradation Temperature ◽  
Dielectric Thermal Analysis ◽  
Aliphatic Ether ◽  
Synthetic Reaction

AbstractThis project aims to develop and characterize a series of bismaleimide (BMI) polymers based on maleic anhydride and aliphatic-ether diamines. The effects of varying the chain length of aliphatic-ether diamines on the resultant bismaleimide systems were evaluated so that their suitability for microelectronics applications could be evaluated. The synthetic reaction and properties of the bismaleimide materials were investigated using Fourier Transform Infrared Spectroscopy (FTIR), Differential Scanning Calorimetry (DSC), Thermo- Gravimetric Analysis (TGA), Dielectric Thermal Analysis (DEA) and rheometry. Results showed that thermal, dielectric and rheological properties were all affected by the main chain length of BMI. The magnitude of the dielectric constant at 100 kHz increases with the increasing chain length. The curing peak temperature, curing heat and degradation temperature of BMI, all decrease with the increasing chain length.

Characterization of Thermal Behavior of Polyester Composites Reinforced with Curaua Fibers by Differential Scanning Calorimetry

2012 ◽  
pp. 297-303
Author(s):  
Felipe Perissé D. Lopes ◽  
Ailton S. Ferreira ◽  
Rubén J. Sanchez Rodriguez ◽  
Teresa E. Castillo ◽  
Sergio N. Monteiro
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Behavior ◽  
Scanning Calorimetry ◽  
Polyester Composites ◽  
Curaua Fibers

Characterization of Lauric Acid Precipitated from Biocompatible Solvents

2019 ◽  
Vol 819 ◽  
pp. 209-214
Author(s):  
Napaphol Puyathorn ◽  
Takorn Chantadee ◽  
Setthapong Senarat ◽  
Thawatchai Phaechamud
Keyword(s):  
Lauric Acid ◽  
Phase Inversion ◽  
Water Resistance ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Degradation Temperature ◽  
Lower Melting Point ◽  
Methyl Pyrrolidone

Water resistance of lauric acid (L) dissolved in biocompatible solvents mainly depended on the water affinity of solvent. L in DMSO (DL) was most sensitive to water and higher than L in N-methyl pyrrolidone (NL) and L in 2-pyrolidone (PL), respectively. From scanning electron microscope, differential scanning calorimetry, thermogravimetric analysis, powder x-ray diffractometry and hot stage microscope tests revealed the alteration of L crystal owing to the interference by solvent during precipitation. All L precipitates had lower melting point and degradation temperature than intact L in which L precipitated from 2-pyrrolidone exhibited the lowest melting temperature. These characteristics will be useful for modifying L in phase inversion in situ forming gel.

scholarly journals Synthesis and characterization of cyanate ester and its blends with bisphenol dicyanate ester

2008 ◽  
Vol 2 (4) ◽  
pp. 239-247
Author(s):  
Samikannu Rakesh ◽  
◽  
Muthusamy Sarojadevi ◽  
Keyword(s):  
Cyanate Ester ◽  
Resonance Spectroscopy ◽  
Scanning Calorimetry ◽  
Limiting Oxygen Index ◽  
Dsc Studies ◽  
Degradation Temperature ◽  
Ft Ir ◽  
Flame Retardant Properties ◽  
Lower Temperature

A new keto-ene functionalized 1, 5-bis (4-hydroxyphenyl)penta-1,4-dien-3-one (HPDO) was prepared from p-hydroxy benzaldehyde and acetone using boric acid as a catalyst. The prepared bisphenol was converted into 1,5-bis (4-cyanatophenyl) penta-1,4-diene-3-one (CPDO) by reacting with cyanogen bromide (CNBr) in the presence of triethylamine. The synthesized bisphenol and the dicyanate ester were characterized by Fourier transform infrared spectroscopy (FT-IR), nuclear magnetic resonance spectroscopy (1H-NMR and 13C-NMR) and elemental analysis (EA) techniques. CPDO was then blended with a commercial bisphenol-A dicyanate ester (BADCy) at different ratios (100:0, 75:25, 50:50. 25:75, 0:100) and the cure characteristics were studied. CPDO was found to be cured at a lower temperature than BADCy. The cyanate ester blends were cured at 373 K (30 min) → 423 K (30 min) → 473 K (60 min) → 523 K (3h). Differential scanning calorimetry (DSC) and thermogravimetric analysis (TGA) were used to study the thermal properties. DSC studies show that the cure (peak) temperature of CPDO with and without a catalyst was found to be 408 K and 466 K respectively. The initial degradation temperature of the cured resins was found to be in the range from 701 K to 705 K. The Limiting Oxygen Index (LOI) value, determined by Van Krevelen’s equation, shows that these blends have good flame retardant properties.

scholarly journals Study on Thermal Behavior of Some Biocompatible and Biodegradable Materials Based on Plasticized PLA, Chitosan, and Rosemary Ethanolic Extract

2020 ◽  
Vol 2020 ◽  
pp. 1-18
Author(s):  
Cornelia Vasile ◽  
Niță Tudorachi ◽  
Traian Zaharescu ◽  
Raluca Nicoleta Darie-Nita ◽  
Catalina Natalia Cheaburu-Yilmaz
Keyword(s):  
Thermal Behavior ◽  
Food Packaging ◽  
Ethanolic Extract ◽  
Thermal Characterization ◽  
Poly Lactic Acid ◽  
Rosemary Extract ◽  
Scanning Calorimetry ◽  
Efficient Protection ◽  
Ft Ir

Thermal characterization of some multifunctional environmentally friendly materials based on plasticized poly (lactic acid) (PLA)/chitosan (CS) and rosemary extract (R) previously obtained is presented. Differential scanning calorimetry (DSC) associated with other complex investigations such as chemiluminescence and coupled thermogravimetry (TG)/Fourier-transform infrared spectroscopy (FT-IR)/mass spectroscopy (MS) was performed in order to test both the thermal behavior and the biocomposition–property relationship. It was established that the rosemary ethanolic extract offers an efficient protection against thermoxidative degradation to the new developed plasticized PLA-based biocomposites which show good thermal properties, being suitable for both medical and food packaging applications.

Characterization of Thermal Behavior of Epoxy Composites Reinforced with Curaua Fibers by Differential Scanning Calorimetry

2016 ◽  
pp. 403-407
Author(s):  
Mariana A. Barcelos ◽  
Carolina Gomes D. Ribeiro ◽  
Jordana Ferreira ◽  
Janaina da S. Vieira ◽  
Frederico M. Margem ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Behavior ◽  
Epoxy Composites ◽  
Scanning Calorimetry ◽  
Curaua Fibers

Characterization of Mesoporous Silicon Using DSC Thermoporometry

2019 ◽  
Vol 18 (03n04) ◽  
pp. 1940073
Author(s):  
Y. Shilyaeva ◽  
O. Volovlikova ◽  
K. Poyarkov ◽  
S. Yuditskaya ◽  
S. Gavrilov
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Behavior ◽  
Pore Water ◽  
Silicon Membrane ◽  
Scanning Calorimetry ◽  
Mesoporous Silicon

The thermal behavior of water confined in mesopores of silicon membrane was evaluated by differential scanning calorimetry. The results showed strong supercooling of water inside the pores which allowed us to estimate the content of freezable pore water and nonfreezable pore water in the analyzed membranes.

Light-cured dental composites characterization by Electron Microscopy

1990 ◽  
Vol 48 (4) ◽  
pp. 428-429
Author(s):  
B. M. Culbertson ◽  
M. L. Devinev ◽  
E. C. Kao
Keyword(s):  
Electron Microscopy ◽  
Mechanical Analysis ◽  
Service Performance ◽  
Dental Composite ◽  
Dental Composites ◽  
Neat Resin ◽  
Scanning Calorimetry ◽  
Research Meeting ◽  
Formulation Variables

The service performance of current dental composite materials, such as anterior and posterior restoratives and/or veneer cements, needs to be improved. As part of a comprehensive effort to find ways to improve such materials, we have launched a broad spectrum study of the physicochemical and mechanical properties of photopolymerizable or visible light cured (VLC) dental composites. The commercially available VLC materials being studied are shown in Table 1. A generic or neat resin VLC system is also being characterized by SEM and TEM, to more fully understand formulation variables and their effects on properties.At a recent dental research meeting, we reported on the differential scanning calorimetry (DSC) and dynamic mechanical analysis (DMA) characterization of the materials in Table 1. It was shown by DSC and DMA that the materials are substantially undercured by commonly used VLC techniques. Post curing in an oral cavity or a dry environment at 37 to 50°C for 7 or more hours substantially enhances the cure of the materials.

Glibenclamide-Nicotinamide Cocrystals Synthesized by The Solvent Evaporation Method to Enhance Solubility and Dissolution Rate of Glibenclamide

2019 ◽  
Vol 9 (01) ◽  
pp. 21-26
Author(s):  
Arif Budiman ◽  
Ayu Apriliani ◽  
Tazyinul Qoriah ◽  
Sandra Megantara
Keyword(s):  
Solvent Evaporation ◽  
Physical Mixture ◽  
Dissolution Profile ◽  
Solvent Evaporation Method ◽  
X Ray Diffraction ◽  
Scanning Calorimetry ◽  
Evaporation Method ◽  
Dissolution Properties ◽  
Mixture Characterization

Purpose: To develop glibenclamide-nicotinamide cocrystals with the solvent evaporation method and evaluate their solubility and dissolution properties. Methods: Cocrystals of glibenclamide-nicotinamide (1:2) were prepared with the solvent evaporation method. The prediction of interactive cocrystals was observed using in silico method. The solubility and dissolution were performed as evaluation of cocrystals. The cocrystals also were characterized by differential scanning calorimetry (DSC), infrared spectrophotometry, and powder X-ray diffraction (PXRD). Result: The solubility and dissolution profile of glibenclamide-nicotinamide cocrystal (1:2) increased significantly compared to pure glibenclamide as well as its physical mixture. Characterization of cocrystal glibenclamide-nicotinamide (1:2) including infrared Fourier transform, DSC, and PXRD, indicated the formation of a new solid crystal phase differing from glibenclamide and nicotinamide. Conclusion: The confirmation of cocrystal glibenclamide-nicotinamide (1:2) indicated the formation of new solid crystalline phases that differ from pure glibenclamide and its physical mixture

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