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    Wyświetlanie 1-7 z 7
    Tytuł:
    Synthesis, spectral and thermal study of (2E,6E)-2,6-bis(4-aminobenzylidene)cyclohexanone
    Autorzy:
    Patel, Jignesh P.
    Parsania, P. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1063056.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    (2E
    6-bis(4-aminobenzylidene)cyclohexanone
    6E)-2
    Anderson-Freeman method
    Photoactive diamine
    kinetic parameters
    thermal stability
    Opis:
    (2E,6E)-2,6-bis(4-aminobenzylidene)cyclohexanone (BABC) was synthesized by two-step reaction of p-nitrobenzaldehyde and cyclohexanone followed by its reduction. The structure of BABC was supported by UV-Vis, FTIR, 1HNMR and mass spectral data. DSC endothermic transition at 230.6 ºC is assigned as melting transition followed by decomposition reaction. BABC is thermally stable up to 240 ºC and followed three step degradation kinetics. Various kinetic parameters were determined by Anderson-Freeman method and discussed.
    Źródło:
    World Scientific News; 2019, 124, 2; 312-318
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Comparative Study of White Jute and Jute Felt Composites of Tetra Functional Epoxy Resin and Araldites
    Autorzy:
    Patel, Jignesh P.
    Parsania, Parsotam H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1192102.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Tetra functional epoxy resin
    araldite
    reinforcement
    water absorption
    Opis:
    White jute and jute felt fiber reinforced composites of tetra functional epoxy resin of bisphenol-C-formaldehyde (EBCF), araldites (GY508 and GY6010) and their hybrid composites were fabricated by hand layup followed by compression molding technique. White jute based composites showed somewhat better mechanical and electrical properties than those of jute felt based composites mainly due to different nature of reinforcing fibers, matrix materials and interfacial adhesion. Good mechanical and electrical properties, excellent hydrolytic stability, comparable equilibrium water absorption and equilibrium time of the composites signified their industrial importance for low load bearing, electrical, electronic and marine applications. EBCF based composites showed comparable mechanical, electrical and water absorption properties as those of araldites based composites signifying industrial utility of EBCF.
    Źródło:
    World Scientific News; 2016, 45, 2; 63-79
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Syntheses of hexafunctional epoxy resin of bisphenol-C-formaldehyde and unsaturated polyester resin for the fabrication of jute and glass hybrid composites and evaluation of mechanical, electrical and water absorption characteristic properties
    Autorzy:
    Patel, Jignesh P.
    Parsania, Parsotam H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1190202.pdf
    Data publikacji:
    2016
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    multifunctional epoxy resin
    unsaturated polyester resin
    hybrid composite
    mechanical and electrical properties
    hydrolytic stability
    Opis:
    Hexafunctional epoxy resin of bisphenol-C-formaldehyde (HEBCF) and unsaturated polyester resin of maleic anhydride and propylene glycol (PER) were synthesized and used for the preparation of jute and glass hybrid composites. The composites were prepared by hand layup followed by compression molding technique. Both types of the hybrid composites possess good mechanical properties. G-HEBCF-PER possesses almost doubled mechanical properties than J-HEBCF-PER except Barcol harness, which is comparable. G-HEBCF-PER and J-HEBCF-PER possess moderate electrical properties due to their polar nature. G-HEBCF-PER and J-HEBCF-PER possess excellent hydrolytic stability, high water absorption tendency (~ 18%) and long equilibrium time (456h) due to presence of hydrophilic hydroxyl and other polar groups in the hybrid composites. The hybrid composites may be useful for low load bearing and marine applications.
    Źródło:
    World Scientific News; 2016, 44; 112-122
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Potential comparison of montmorillonite filled and unfilled epoxy methacrylate of bisphenol-C-glass/ jute/treated jute and hybrid composites
    Autorzy:
    Bhatt, Ritesh D.
    Patel, Jignesh P.
    Parsania, Parsotam H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1193485.pdf
    Data publikacji:
    2021
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Epoxy methacrylate
    chemical resistance
    composites
    diffusivity
    hydrolytic stability
    mechanical and electrical properties
    montmorillonite
    Opis:
    Montmorillonite filled and unfilled controls, jute/treated jute/glass/hybrid composites were prepared at room temperature for three h and under 5 MPa pressure. The composites were post cured at 150 °C for 30 min. A 40% styrene was used as a reactive diluent, and 1% methylethylketone peroxide, 1.5 % cobalt octoate, and 1.5% dimethylaniline were used as initiator and accelerator, and a promoter. Filled and unfilled composites showed good to excellent mechanical and electrical properties, excellent hydrolytic stability and chemical resistance against water acids, alkali, salt solutions; high water absorption tendency (7.9-20.5%), and longer equilibrium times (288-432h). In different environments at 30 °C observed water absorption trend is H2SO4 > HCl > NaOH > H2O > NaCl. Hybrid composites showed intermediate properties of their parent composites. MMT filled treated jute (46), and unfilled glass (48), and MMT filled glass (48) composites revealed Barcol hardness between the suggested range of 45-65 for scratch and wear resistance proof materials. The nature of the reinforcements, matrix, and filler; fiber treatment, environmental conditions, etc., had affected studied properties and water absorption behavior.
    Źródło:
    World Scientific News; 2021, 158; 227-246
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of temperature and solvents on ultrasonic speed and thermo-acoustic parameters of epoxy resin of (2E, 6E)-bis (4-hydroxy benzylidene)-4-methylcyclohexanone solutions at four different temperatures
    Autorzy:
    Chopda, Jalpa V.
    Sankhavara, Dharmesh B.
    Patel, Jignesh P.
    Parsania, P. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1066232.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Density
    Epoxy resin
    Solvation number
    Thermo-acoustic parameters
    Ultrasonic speed
    Viscosity
    Opis:
    The density (), viscosity () and ultrasonic speed (U) of 1, 4-dioxane (DO), tetrahydrofuran (THF), chloroform (CF) and solutions (0.25-5 wt%) of epoxy resin of (2E, 6E)-bis(4-hydroxy benzylidene)-4-methylcyclohexanone have been investigated at 298, 303, 308 and 313 K to understand molecular interactions in solutions of different polarity. Various acoustical and thermodynamic activation parameters such as acoustical impedance (Z), adiabatic compressibility (a), internal pressure (), free volume (Vf), intermolecular free path length (Lf), van der Waals constant(b), viscous relaxation time (), classical absorption coefficient (f2)cl, Rao`s molar sound function (Rm) and solvation number (Sn) were determined using, and U data and correlated with concentration (C) at four different temperatures (T). Good to excellent correlation between a given parameter and concentration is observed at all T. Linear or non-linear increase or decrease of studied acoustical and thermodynamic parameters with concentration of epoxy resin at different temperatures indicated existence of strong molecular interactions (solvent-solute and solute-solute) in the solutions. The non-linear increase of Sn with concentration of epoxy resin further supported the existence of strong molecular interactions and structure forming tendency of EMBHBC. The competing solvent-solute and solute-solute interactions are also supported by thermodynamic activation parameters (G, H and S).
    Źródło:
    World Scientific News; 2019, 131; 222-241
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Synthesis, spectral and thermal study of (2E, 6E) 2,6-bis(4-hydroxy benzylidene)-4-R-cyclohexanone
    Autorzy:
    Sankhavara, Dharmesh B.
    Chopda, Jalpa V.
    Patel, Jignesh P.
    Parsania, P. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1070865.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Chalcone
    bisphenol
    heat of melting
    kinetic parameters
    thermal stability
    Opis:
    (2E,6E) 2,6-Bis(4-hydroxybenzalidene)-4-R-cyclohexanone (BHBC, R = H and MBHBC, R = CH3) was synthesized by condensing cyclohexanone/4-methylcyclohexanone with 4-hydroxy benzaldehyde using mixture of boric acid and hydrochloric acid as a catalyst at 60-70 ºC for 1 h. The structures of BHBC and MBHBC are supported by FTIR, 1HNMR, 13CNMR and MS techniques. DSC endothermic transition at 282.48 ºC (BHBC) and two endothermic transitions at 214.66 and 224.83 ºC and assigned as melting transitions. The compositions of the two isomers of MBHBC were determined from their corresponding peak areas and observed compositions are 81.5% and 18.5%, respectively for Isomer-I and Isomer-II. BHBC and MBHBC are thermally stable up to 305 ºC and 285 ºC, respectively and followed three step degradation kinetics. Both the compounds followed apparently first order degradation kinetics and were completely degraded into low molecular mass hydrocarbons.
    Źródło:
    World Scientific News; 2019, 123; 141-160
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preparation and performance evaluation of jute and glass composites of epoxy resin of (2E,6E)-2,6-bis (4-hydroxy benzylidene)-4-methylcyclohexanone
    Autorzy:
    Chopda, Jalpa V.
    Sankhavara, Dharmesh B.
    Patel, Jignesh P.
    Parsania, P. H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1075481.pdf
    Data publikacji:
    2019
    Wydawca:
    Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
    Tematy:
    Composites
    Diffusivity
    Electric strength
    Flexural strength
    Photosensitive epoxy resin
    Tensile strength
    Volume resistivity
    Water uptake
    Opis:
    Jute and glass composites were prepared by compressing molding technique at 150C for 3h under 20 MPa pressure. J-EMBHBC-DDS, J-EMBHBC-THPA, G-EMBHBC-DDS and G-EMBHBC-THPA showed 15, 15.1, 58.3 and 18.7 MPa tensile strength, respectively. J-EMBHBC-DDS and J-EMBHBC-THPA showed 22.9 and 19.4 MPa flexural strength, respectively. J-EMBHBC-DDM and G-EMBHBC-DDM showed 1.6×109 and 1.2×1012 ohm cm volume resistivity, respectively. J-EMBHBC-DDM and G-EMBHBC-DDM showed 2.8 and 11.2 kVmm-1, respectively. Water uptake in the composites was carried out in pure water and 10% each of aqueous HCl, H2SO4, HNO3, NaOH, KOH and NaCl solutions at 35 C as well as in boiling water. Composites showed high water uptake tendency and longer equilibrium time in different environments. High water uptake in the composites is due to presence of hydroxyl groups in celluloses and resins and also due to formation of micro cracks. Nature of the electrolytes also played an important role on water uptake behavior and diffusivity in the composites. Drastic reduction in equilibrium water uptake time was observed in boiling water.
    Źródło:
    World Scientific News; 2019, 129; 23-39
    2392-2192
    Pojawia się w:
    World Scientific News
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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