Thermal Stability and Structure-gas Transport Property Relationships for Nanoporous Cyanate Ester Resins | Chapter 5 | Scientific Research, New Technologies and Applications Vol. 4

This chapter discloses the relationships between the structure, thermal and gas transport properties of nanoporous thermostable cyanate ester resins (CERs). The nanoporous CERs were derived from the polycyclotrimerization of 1,1'-bis(4-cyanatophenyl) ethane with 30 or 50 wt% of inert high-boiling temperature dimethyl- or dibutyl phthalates, followed by their quantitative removal. Porous structure in the CER-based films was generated through a chemically induced phase separation process, with subsequent porogen extraction from the densely crosslinked CERs. The structure and morphology of the nanoporous films produced were investigated by FTIR and SEM techniques, respectively. The pore sizes ranging from Dp ~ 10 to 120 nm in the samples obtained were observed. To achieve complete desorption of the porogen moieties from the networks, an additional thermal annealing at 250oC was performed. The annealing behavior and thermal stability of nanoporous film materials were also studied in detail. Gas transport properties of the nanoporous CER films were analyzed following various processing steps. The relationships between the CER structure and the key gas transport parameters were determined. The final porous materials are characterized by high thermal stability, with glass transition temperatures exceeding 214oC.

 

Author (s) Details

Kristina Gusakova
Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkivske Shose 02155 Kyiv, Ukraine.

 

Alexander Fainleib
Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkivske Shose 02155 Kyiv, Ukraine.

 

Eliane Espuche
Université de Lyon, «Ingénierie des Matériaux Polymères», UMR 5223 CNRS-UCBL-INSA Lyon-UJM, 69622 Villeurbanne, France.

 

Jean-Marc Saiter
Nutriset Développement, 640 Chemin du Chateau, 76770 Malaunay, France.

 

Olga Grigoryeva
Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkivske Shose 02155 Kyiv, Ukraine.

 

Olga Starostenko
Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkivske Shose 02155 Kyiv, Ukraine.

 

Fabrice Gouanve
Université de Lyon, «Ingénierie des Matériaux Polymères», UMR 5223 CNRS-UCBL-INSA Lyon-UJM, 69622 Villeurbanne, France.

Daniel Grande
Université de Strasbourg, CNRS, Institut Charles Sadron UPR22, 23, Rue du Loess, 67034 Strasbourg, France.

 

 

Please see the book here:- https://doi.org/10.9734/bpi/srnta/v4/2170

Thermal Degradation Kinetics and Morphological Analysis of Poly-vinyl-butyral Cast Films Prepared with Various Organic Solvents | Chapter 9 | Chemical and Materials Sciences: Developments and Innovations Vol. 10

Polyvinyl butyral (PVB) is an amorphous thermoplastic, produced through the reaction of polyvinyl alcohol with butyraldehyde in an acidic medium. The different groups are responsible for the physical and chemical properties of the polymer, including adhesiveness and viscoelasticity. Polyvinyl butyral (PVB) films are highly promising materials as they combine interesting thermal and structural morphology properties and in many cases coating viability. However, the polymerization ability of PVB films through solvent casting methods using different solvents is fundamentally not well understood. In this rationale, the present study demonstrates the use of Isopropanol, ethanol, methanol, and acetic acid for the development of high quality PVB films. The resulting acetic acid-based PVB film exhibits moderated thermal stability with smooth surface morphology which is an important factor in coating applications. On the other hand, ethanol-based PVB film achieves higher thermal stability relative to all other PVB films with some structural defects attributed to less impurities in the solvents. The paper shows a variety of solvents suitable with PVB for a range of applications in the coating industry. This study will pave the development of high-performance PVB cast films.

 

Author (s) Details

 

Abesach Moshalagae Motlatle
Analytical Chemistry Division, Mintek, Private Bag X3015, Randburg, 2125, South Africa.

 

Lebohang Vivacious Mokoena
Analytical Chemistry Division, Mintek, Private Bag X3015, Randburg, 2125, South Africa.

 

Please see the book here:- https://doi.org/10.9734/bpi/cmsdi/v10/4053

Synthesis, Spectral Characterization and Stability Studies of Spiroborate Ester of Curcumin with Salicylic Acid | Chapter 8 | Novel Aspects on Chemistry and Biochemistry Vol. 1

 A spiroborate ester of curcumin (CBS) was combined using salicylic acid as a ligand to study the movement of its warm and hydrolytic degradation. The construction of the prepared compound was from UV-Visible spectra, IR spectroscopy, and NMR spectroscopy. The isothermal and non-isothermal thermogravimetric order was used to study the thermal breakdown of CBS at various heating rates in a nitrogen air. The hydrolytic stability of the spiroborate ester was examined in an aqueous acetone order with various water percentages and temperatures. The incitement energies of hydrolysis were premeditated using the Arrhenius equating, and the relevant thermodynamic limits were calculated utilizing the Eyring equation. A reasonable mechanistic route for the hydrolysis of the complex was suggested.

Author(s) Details:

Jeena John,
Department of Chemistry, Mahatma Gandhi College, University of Kerala, Thiruvananthapuram, India and Department of Chemistry, Christian College Kattakada, University of Kerala, Thiruvananthapuram, India.

Sudha Devi Rug                mini,
Department of Chemistry, Mahatma Gandhi College, University of Kerala, Thiruvananthapuram, India.

Balachandran Sreedharan Nair,
Department of Chemistry, Mahatma Gandhi College, University of Kerala, Thiruvananthapuram, India.

Please see the link here: https://stm.bookpi.org/NACB-V1/article/view/10249

Thermophysical Properties and Thermal Stability of High-Density Frame Hydrocarbons | Chapter 7 | Newest Updates in Physical Science Research Vol. 1

The vapor pressure, enthalpy and entropy of evaporation, boiling point, critical parameters and kinetics of thermal decomposition of four high-density frame and spiranic hydrocarbons of interest for use as aircraft synthetic fuels or their components have been investigated. The data obtained in the research are important both at the stage of developing new fuels and for improving existing fuel compositions.

Author (s) Details

A. A. Molokanov
Institute of Problems of Chemical Physics of RAS, Chernogolovka, Moscow Region, Russia and Moscow Power Engineering Institute, Moscow, Russia.

L. S. Yanovskiy
Institute of Problems of Chemical Physics of RAS, Chernogolovka, Moscow Region, Russia and Moscow State University, Moscow, Russia and Moscow Aviation Institute, Moscow, Russia.

A. I. Kazakov
Institute of Problems of Chemical Physics of RAS, Chernogolovka, Moscow Region, Russia.

N. A. Plishkin
Institute of Problems of Chemical Physics of RAS, Chernogolovka, Moscow Region, Russia.

N. I. Varlamova
Institute of Problems of Chemical Physics of RAS, Chernogolovka, Moscow Region, Russia.

View Book :- https://stm.bookpi.org/NUPSR-V1/issue/view/23