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.

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.

scholarly journals THERMAL STABILITY AND DAMPING PROPERTIES OF POLYURETHANE HYBRID MATERIAL BASED ON CASTOR OIL

2014 ◽  
Vol 5 (1) ◽  
Author(s):  
Jaroslava Budinski Simendić ◽  
Zoran Bjelović ◽  
Suzana Samaržija Jovanović ◽  
Vojislav Aleksić ◽  
Helena Valentova ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Castor Oil ◽  
Toluene Diisocyanate ◽  
Damping Capacity ◽  
Damping Properties ◽  
Degradation Temperature ◽  
Reactive Groups

This study reports the fabrication of environmentally friendly polyurethane materials using either 2,4-toluene diisocyanate or isophorone diisocyanate, castor oil as a polyol component, and TiO2 nanoparticles. Samples were prepared with stoichiometric balance of reactive groups. Dynamic viscoelastic properties of prepared samples were studied. The ratio of the loss component to the storage component (tanδ) was used as a measure of the material damping properties. The glass transition temperature was determined as a position of the tanδ curve maximum. The temperature range with tanδ > 0.3 was used to evaluate damping capacity of elastomers. Thermal stability of prepared samples was estimated by TGA method. It was assessed that PU based on aliphatic diisocyanate have higher thermal stability. Obtained values of the glass transition temperature and the starting degradation temperature are important for the application window of novel materials.

Effect of Thermal Degradation on Glass Transition Temperature of PMMA

2004 ◽  
Vol 205 (14) ◽  
pp. 1858-1862 ◽  
Author(s):  
Katrin Wondraczek ◽  
Jörg Adams ◽  
Jürgen Fuhrmann
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Degradation

scholarly journals The Mechanical Properties of PVC Nanofiber Mats Obtained by Electrospinning

Fibers ◽  
2021 ◽  
Vol 9 (1) ◽  
pp. 2
Author(s):  
Quoc Pham Le ◽  
Mayya V. Uspenskaya ◽  
Roman O. Olekhnovich ◽  
Mikhail A. Baranov
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermogravimetric Analysis ◽  
Thermal Degradation ◽  
Young’S Modulus ◽  
Young's Modulus ◽  
Nanofiber Mats

This paper investigates the mechanical properties of oriented polyvinyl chloride (PVC) nanofiber mats, which, were obtained by electrospinning a PVC solution. PVC was dissolved in a solvent mixture of tetrahydrofuran/dimethylformamide. Electrospinning parameters used in our work were, voltage 20 kV; flow rate 0.5 mL/h; the distance between the syringe tip and collector was 15 cm. The rotating speed of the drum collector was varied from 500 to 2500 rpm with a range of 500 rpm. Nanofiber mats were characterized by scanning electron microscope, thermogravimetric analysis, differential scanning calorimetry methods. The mechanical properties of PVC nanofiber mats, such as tensile strength, Young’s modulus, thermal degradation, and glass transition temperature were also analyzed. It was shown that, by increasing the collector’s rotation speed from 0 (flat plate collector) to 2500 rpm (drum collector), the average diameter of PVC nanofibers decreased from 313 ± 52 to 229 ± 47 nm. At the same time, it was observed that the mechanical properties of the resulting nanofiber mats were improved: tensile strength increased from 2.2 ± 0.2 MPa to 9.1 ± 0.3 MPa, Young’s modulus from 53 ± 14 to 308 ± 19 MPa. Thermogravimetric analysis measurements showed that there was no difference in the process of thermal degradation of nanofiber mats and PVC powders. On the other hand, the glass transition temperature of nanofiber mats and powders did show different values, such values were 77.5 °C and 83.2 °C, respectively.

scholarly journals Thermal and Mechanical Properties of Vinyl Ester Hybrid Composites with Carbon Black and Glass Reinforcement

2021 ◽  
Vol 2021 ◽  
pp. 1-7
Author(s):  
Geetanjali S. Guggari ◽  
S. Shivakumar ◽  
G. A. Manjunath ◽  
R. Nikhil ◽  
Alagar Karthick ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Flexural Strength ◽  
Carbon Black ◽  
Vinyl Ester ◽  
Flexural Modulus ◽  
Thermal And Mechanical Properties ◽  
Degradation Temperature

The objective of the work is to investigate both thermal and mechanical properties of vinyl ester/glass composites incorporated with different percentages of carbon black reinforcements through experimental approaches. Analysis of glass transition temperature, thermogravimetric analysis (TGA), degradation temperature, hardness, flexural strength, etc. is performed using differential scanning calorimeter, X-ray diffraction, tensile machine, and flexural machine, respectively. The scanning electron microscope was used for surface fracture studies. The degradation temperature reduces initially with the percentage of carbon black and then increases. Glass transition temperature increases with the percentage of carbon black while above 500°C temperature, the weight percentage of composite drops. The results also reveal that 4% of carbon with vinyl ester improved the tensile strength by 30%, hardness by 35%, flexural strength by 45%, flexural modulus by 66%, and interlaminate shear strength by 44% when compared with the other percentage of carbon black.

scholarly journals High Thermally Stable and Melt Processable Polyimide Resins Based on Phenylethynyl-Terminated Oligoimides Containing Siloxane Structure

Materials ◽  
2020 ◽  
Vol 13 (17) ◽  
pp. 3742
Author(s):  
Xiaozhou Xu ◽  
Yi Liu ◽  
Bangwei Lan ◽  
Song Mo ◽  
Lei Zhai ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Rheological Properties ◽  
Chemical Crosslinking ◽  
Thermally Stable ◽  
Melt Viscosity ◽  
Biphenyltetracarboxylic Dianhydride ◽  
Thermal Stability Of

A series of 4-phenylethnylphthalic anhydride (PEPA)-terminated oligoimides were prepared by co-oligomerizing isomeric dianhydrides, i.e., 2,3,3′,4′-biphenyltetracarboxylic dianhydride (a-BPDA), 2,3,3′,4′-benzophenonetetracarboxylic dianhydride (a-BTDA) or 2,3,3′,4′-diphenylethertetracarboxylic dianhydride (a-ODPA), with diamines mixture of bis(4-aminophenoxy)dimethyl silane (APDS) and 2,2′-bis(trifluoromethyl) benzidine (TFDB). The effects of siloxane content and dianhydride structure on the rheological properties of these oligoimides and thermal stability of the corresponding cured polyimide resins were investigated. The results indicated that the introduction of the siloxane structure improved the melt processability of the oligoimides, while the thermal stability of the cured polyimide resins reduced. The oligoimide derived from a-ODPA revealed better melt processability and melt stability due to the existence of a flexible dianhydride structure. The oligoimide PIS-O10 derived from a-ODPA gave the lowest minimum melt viscosity of 0.09 Pa·s at 333 °C and showed the excellent melt stability at 260 °C for 2 h with the melt viscosity in the range of 0.69–1.63 Pa·s. It is also noted that the thermal stability of these resins can be further enhanced by postcuring at 400–450 °C, which is attributed to the almost complete chemical crosslinking of the phenyethynyl combined with oxidative crosslinking of siloxane. The PIS-T10 and PIS-O10 resins that were based on a-BTDA and a-ODPA, respectively, even showed a glass transition temperature over 550 °C after postcuring at 450 °C for 1 h.

Development of technology of polysulfone production for 3D printing

2017 ◽  
Vol 29 (6) ◽  
pp. 724-729 ◽  
Author(s):  
Azamat A Zhansitov ◽  
Svetlana Y Khashirova ◽  
Azamat L Slonov ◽  
Zhanna I Kurdanova ◽  
Albert S Shabaev ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
3D Printing ◽  
Thermal Degradation ◽  
Strength Properties ◽  
Cross Linking ◽  
Molten Polymer ◽  
Chain Rigidity

This article discusses the results of experimental research on the synthesis of polyether sulfones and the molten polymer filament layering 3-D printing technology. The regularities of influence of the polycondensation conditions in the synthesis of polyphenylene sulfone on the processes of cross-linking, thermal degradation of the polymer at processing temperatures, and 3-D printing were revealed. It is shown that introduction of cardo fragments increases the glass transition temperature and heat resistance of the copolymers, and the elastic-strength properties, due to the increased chain rigidity. It determined the influence of technological modes of 3-D printing by layering molten polymer filaments on the physico-mechanical properties of polyether sulfones.

Glass transition temperature and thermal degradation of N-2-acryloyloxyethyl phthalimide copolymers

2000 ◽  
Vol 45 (4-5) ◽  
pp. 397-404 ◽  
Author(s):  
M. Fernández-García ◽  
J. L. de la Fuente ◽  
E. L. Madruga
Keyword(s):  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Degradation

The Processing Properties of a Phosphazene-containing Epoxy Oligomer

2017 ◽  
Vol 44 (4) ◽  
pp. 25-28 ◽  
Author(s):  
V.V. Kireev ◽  
I.D. Simonov-Emel'yanov ◽  
Yu.V. Bilichenko ◽  
K.A. Brigadnov ◽  
S.N. Filatov ◽  
...  
Keyword(s):  
Activation Energy ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Residual Stresses ◽  
Bisphenol A ◽  
Viscous Flow ◽  
Rheological Properties ◽  
Epoxy Oligomer ◽  
Processing Properties

The results of investigating the rheological properties and processing characteristics of a system consisting of 60 wt% epoxy bisphenol A resin of type ED-20 and 40 wt% phosphazene-containing epoxy oligomer are given. The kinetic dependences of the shrinkage, residual stresses, and rheokinetics are obtained, and the gelation times, activation energy of viscous flow, and glass transition temperature are determined.

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