scholarly journals Thermal Study of Anhydrides Cured Tetrafunctional Cardo Epoxy Resin

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Jignesh P. Patel ◽  
Parsotam H. Parsania
Keyword(s):  
Thermal Properties ◽  
Maleic Anhydride ◽  
Epoxy Resin ◽  
Degradation Kinetics ◽  
Frequency Factor ◽  
Entropy Change ◽  
Thermal Study ◽  
Gel Time ◽  
Degradation Reactions ◽  
Different Types

Tetrafunctional cardo epoxy resin (EBCF) was cured by using 10 wt% maleic anhydride (MA), pyromellitic dianhydride (PMDA), phthalic anhydride (PA), tetrahydrophthalic anhydride (THPA), tetrabromophthalic anhydride (TBPA), and tetrachlorophthalic anhydride (TCPA) as hardeners at 120°C for 40–105 min (gel time) and then postcured 1 h at 130°C. Gel time is found to depend on the structure of the anhydrides used. Cured samples were found insoluble in common solvents. Cured and uncured EBCF were characterized by FTIR, DSC, and TGA techniques. Cured and uncured resins followed multistep degradation reactions. Kinetic parameters, namely, order of degradation, energy of activation, frequency factor, and entropy change, were determined according to the Anderson-Freeman method and interpreted in light of the nature of hardeners used for curing purpose. The resins followed integral or fractional order degradation kinetics. Complex degradation reactions are due to different types of linkages in cured resins. Both nature and structure of resin and hardeners affected the curing behavior and the resultant thermal properties of the cured resins.

scholarly journals Effect of Substitutions on Thermal Behavior of Symmetric Doubleschiff Bases of 1,1’-Bis(4-Amino Phenyl)Cyclohexane

2016 ◽  
Vol 63 ◽  
pp. 145-149
Author(s):  
Bhavesh J. Gangani ◽  
Parsotam H. Parsania
Keyword(s):  
Thermal Properties ◽  
Thermal Behavior ◽  
Kinetic Parameters ◽  
Schiff Bases ◽  
Frequency Factor ◽  
Entropy Change ◽  
Nitrogen Atmosphere ◽  
Energy Of Activation ◽  
Thermo Gravimetric ◽  
Degradation Kinetic

Thermo gravimetric analyses of some symmetric double Schiff bases of 1, 1’- bis (4-amino phenyl) cyclohexane (SDSB-1 to SDSB-6) was carried out at 100C/min in nitrogen atmosphere. Schiff bases are thermally stable up to 200-285°C and followed two step degradation kinetic. Various kinetic parameters such as order of degradation (n), energy of activation (Ea), frequency factor (A) and entropy change (ΔS) were derived accordingly Anderson-Freeman method interpreted in light of nature of the substituents. The nature, size and position of substituents affected thermal properties of the Schiff bases.

scholarly journals Reaction Mechanism and Mechanical Property Improvement of Poly(Lactic Acid) Reactive Blending with Epoxy Resin

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2429
Author(s):  
Krittameth Kiatiporntipthak ◽  
Nanthicha Thajai ◽  
Thidarat Kanthiya ◽  
Pornchai Rachtanapun ◽  
Noppol Leksawasdi ◽  
...  
Keyword(s):  
Thermal Properties ◽  
Epoxy Resin ◽  
Softening Temperature ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Nanoparticle Dispersion ◽  
Reactive Blending ◽  
Partial Miscibility ◽  
Epoxy Blends ◽  
Epoxy Content

Polylactic acid (PLA) was melt-blended with epoxy resin to study the effects of the reaction on the mechanical and thermal properties of the PLA. The addition of 0.5% (wt/wt) epoxy to PLA increased the maximum tensile strength of PLA (57.5 MPa) to 67 MPa, whereas the 20% epoxy improved the elongation at break to 12%, due to crosslinking caused by the epoxy reaction. The morphology of the PLA/epoxy blends showed epoxy nanoparticle dispersion in the PLA matrix that presented a smooth fracture surface with a high epoxy content. The glass transition temperature of PLA decreased with an increasing epoxy content owing to the partial miscibility between PLA and the epoxy resin. The Vicat softening temperature of the PLA was 59 °C and increased to 64.6 °C for 0.5% epoxy. NMR confirmed the reaction between the -COOH groups of PLA and the epoxy groups of the epoxy resin. This reaction, and partial miscibility of the PLA/epoxy blend, improved the interfacial crosslinking, morphology, thermal properties, and mechanical properties of the blends.

The effects of modified zinc oxide nanoparticles on the mechanical/thermal properties of epoxy resin

2020 ◽  
Vol 137 (43) ◽  
pp. 49330
Author(s):  
Yasmine N. Baghdadi ◽  
Lucia Youssef ◽  
Kamal Bouhadir ◽  
Mohammad Harb ◽  
Samir Mustapha ◽  
...  
Keyword(s):  
Zinc Oxide ◽  
Thermal Properties ◽  
Epoxy Resin ◽  
Zinc Oxide Nanoparticles ◽  
Oxide Nanoparticles

Thermal Stabilities and the Thermal Degradation Kinetics Study of the Flame Retardant Epoxy Resins

2014 ◽  
Vol 1053 ◽  
pp. 263-267 ◽  
Author(s):  
Xiu Juan Tian
Keyword(s):  
Thermal Stability ◽  
Thermal Degradation ◽  
Flame Retardant ◽  
Epoxy Resin ◽  
Epoxy Resins ◽  
Degradation Kinetics ◽  
Thermal Degradation Kinetics ◽  
Thermal Stabilities ◽  
Degradation Kinetic ◽  
Modified Epoxy

Thermal stability and thermal degradation kinetics of epoxy resins with 2-(Diphenylphosphinyl)-1, 4-benzenediol were investegated by thermogravimetric analysis (TGA) at different heating rates of 5 K/min, 10 K/min, 20 K/min and 40 K/min. The thermal degradation kinetic mechanism and models of the modified epoxy resins were determined by Coast Redfern method.The results showed that epoxy resins modified with the flame retardant had more thermal stability than pure epoxy resin. The solid-state decomposition mechanism of epoxy resin and the modified epoxy resin corresponded to the controlled decelerating ځ˽̈́˰̵̳͂͆ͅ˼˰̴̱̾˰̸̵̈́˰̵̸̳̱̹̽̾̓̽˰̶̳̹̾̈́̿̾̓ͅ˰̶˸ځ˹˰̵̵͇͂˰̃˸́˽ځ˹2/3. The introduction of phosphorus-containing flame retardant reduced thermal degradation rate of epoxy resins in the primary stage, and promote the formation of carbon layer.

Incorporation of epoxy resin and carbon nanotube into silica/siloxane network for improving thermal properties

2016 ◽  
Vol 51 (19) ◽  
pp. 9057-9073 ◽  
Author(s):  
Saeid Najafi-Shoa ◽  
Hossein Roghani-Mamaqani ◽  
Mehdi Salami-Kalajahi ◽  
Reza Azimi ◽  
Meysam Gholipour-Mahmoudalilou
Keyword(s):  
Thermal Properties ◽  
Carbon Nanotube ◽  
Epoxy Resin

Synthesis and thermal properties of urethane-containing epoxy resin

2015 ◽  
Vol 24 ◽  
pp. 20-23 ◽  
Author(s):  
Fan-Long Jin ◽  
Heng-Chang Liu ◽  
Baoqing Yang ◽  
Soo-Jin Park
Keyword(s):  
Thermal Properties ◽  
Epoxy Resin

scholarly journals Modification of epoxy resin: a comparison of different types of elastomer

2005 ◽  
Vol 24 (3) ◽  
pp. 387-394 ◽  
Author(s):  
Valéria D. Ramos ◽  
Helson M. da Costa ◽  
Vera L.P. Soares ◽  
Regina S.V. Nascimento
Keyword(s):  
Epoxy Resin ◽  
Different Types
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