scholarly journals A study of the polymerization of a monofunctional benzoxazine monomer based on phenol and aniline and its copolymerization with epoxy resins

2021 ◽  
pp. 14-18
Author(s):  
I. A. Sarychev ◽  
V. V. Khmelnitsky ◽  
M. A. Khaskov ◽  
M. A. Guseva
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Rheological Properties ◽  
Epoxy Resins ◽  
Thermal Characteristics ◽  
Coke Residue

In the work, the liquid monofunctional benzoxazine monomer based on phenol and aniline (P-a) was synthesized in melt and benzoxazine-epoxy compositions based on it were obtained. The processes of polymerization of a benzoxazine monomer and its copolymerization with epoxy resins of various structures and functionality in catalyzed and non-catalyzed systems have been investigated, and the rheological properties of the compositions have been evaluated. For the obtained polybenzoxazines and benzoxazine-epoxy copolymers, the thermal characteristics were determined, in particular, the glass transition temperature, the temperature of the onset of intense destruction and the coke residue. It has been established that the structure and functionality of epoxy resins have a different effect on the thermal characteristics of the copolymers.

Study on the Composites Epoxy Resin/Nano-TiO2/Polyester

2013 ◽  
Vol 787 ◽  
pp. 408-412
Author(s):  
Jiao Yan Ai ◽  
Quan Chen ◽  
Xiao Bo Wang
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Epoxy Resin ◽  
Diethylene Glycol ◽  
Epoxy Resins ◽  
Experimental Results ◽  
Hydroxybenzoic Acid ◽  
Suitable Amount

Two kinds of polyester bis (p-hydroxybenzoic acid) butanediolatepolyester (BDPET) and bis (p-hydroxybenzoic acid) diethylene glycol (DGPET) were synthesized through melting transesterification reaction.Then the epoxy resins were modified with BDPET or DGPET,and nanoTiO2. The composites were characterized by DSC and SEM. The experimental results showed that the polyester can act as an effective toughening modifier for the epoxy resin. The mechanical properties of the composites were greatly improved and reached to the maxium at 4wt.%PET. The PET/EP system modified by adding suitable amount of nanoTiO2have better performance.The glass transition temperature (Tg) of PET/EP and nanoTiO2/PET/EP system improved about 20°Cand 27.8°C,respectively.

scholarly journals United-Atom Molecular Dynamics Study of the Mechanical and Thermomechanical Properties of an Industrial Epoxy

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3443
Author(s):  
Riki Maicas ◽  
Irena Yungerman ◽  
Yarden B. Weber ◽  
Simcha Srebnik
Keyword(s):  
Molecular Dynamics ◽  
Glass Transition ◽  
Elastic Modulus ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Poisson’S Ratio ◽  
Epoxy Resins ◽  
Molecular Simulations ◽  
Poisson's Ratio ◽  
Method Of Evaluation

Epoxy resins are the most commonly used adhesives in industry due to their versatility, low cost, low toxicity, low shrinkage, high strength, resistance to moisture, and effective electrical resistance. These diverse properties can be tailored based on the chemical structure of the curing agent and the conditions of the curing process. Molecular simulations of epoxy resins have gained attention in recent years as a means to navigate the vast choice of chemical agents and conditions that will give the required properties of the resin. This work examines the statistical uncertainty in predicting thermodynamic and mechanical properties of an industrial epoxy resin using united atom molecular dynamics simulation. The results are compared with experimental measurements of the elastic modulus, Poisson’s ratio, and the glass transition temperature obtained at different temperatures and degrees of curing. The decreasing trend of the elastic modulus with increasing temperature is accurately captured by the simulated model, though the uncertainty in the calculated average is large. The glass transition temperature is expectedly overpredicted due to the high rates accessible to molecular simulations. We find that Poisson’s ratio is particularly sensitive to sample anisotropy as well as the method of evaluation, which explains the lack of consistent trends previously observed with molecular simulation at different degrees of crosslinking and temperatures.

scholarly journals Effect of precise linker length, bond density, and broad temperature window on the rheological properties of ethylene vitrimers

Soft Matter ◽  
2021 ◽  
Author(s):  
Bhaskar Soman ◽  
Christopher M. Evans
Keyword(s):  
Relaxation Time ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Rheological Properties ◽  
Dynamic Networks ◽  
Arrhenius Behavior ◽  
Linker Length ◽  
Bond Density ◽  
Temperature Window

Dynamic networks with precise spacers between boronic ester bonds were investigated over a broad temperature window. Arrhenius behavior breaks down and an increase in relaxation time is observed when approach the glass transition temperature.

Determination of glass transition temperature, thermal expansion and, shrinkage of epoxy resins

1989 ◽  
Vol 267 (11) ◽  
pp. 970-975 ◽  
Author(s):  
J. Kulawik ◽  
Z. Szeglowski ◽  
T. Czapla ◽  
J. P. Kulawik
Keyword(s):  
Thermal Expansion ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Epoxy Resins

Construction of the di(trimethylolpropane) cross linkage and the phenylnaphthalene structure coupled with selective β-O-4 bond cleavage for synthesizing lignin-based epoxy resins with a controlled glass transition temperature

2016 ◽  
Vol 18 (24) ◽  
pp. 6526-6535 ◽  
Author(s):  
Atsushi Kaiho ◽  
Daniele Mazzarella ◽  
Masamitsu Satake ◽  
Makiko Kogo ◽  
Ryo Sakai ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermodynamic Properties ◽  
Epoxy Resins ◽  
Bond Cleavage ◽  
Cross Linkage

Lignin-based epoxy resins with controlled thermodynamic properties were synthesized.

Impact of metal cations on the thermal, mechanical, and rheological properties of telechelic sulfonated polyetherimides

2020 ◽  
Vol 11 (2) ◽  
pp. 393-400 ◽  
Author(s):  
Ke Cao ◽  
Joel M. Serrano ◽  
Tianyu Liu ◽  
Benjamin J. Stovall ◽  
Zhen Xu ◽  
...  
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Degradation ◽  
Rheological Properties ◽  
Metal Cation ◽  
Complex Viscosity ◽  
Degradation Temperature ◽  
Cation Size ◽  
Thermal Degradation Temperature

The glass transition temperature, thermal degradation temperature, and complex viscosity of metal sulfonated polyetherimides decrease with an increase in metal cation size.

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