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

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

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 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.

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.

Fractionation of lignosulfonates: comparison of ultrafiltration and ethanol solubility to obtain a set of fractions with distinct properties

Holzforschung ◽  
2015 ◽  
Vol 69 (2) ◽  
pp. 127-134 ◽  
Author(s):  
Antoine Duval ◽  
Sonia Molina-Boisseau ◽  
Christine Chirat
Keyword(s):  
Molecular Weight ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermal Degradation ◽  
Phenolic Hydroxyl ◽  
Hydroxyl Groups ◽  
Incomplete Removal ◽  
Phenolic Hydroxyl Groups

Abstract Commercial lignosulfonates (LS), recovered from bisulfite pulping processes, are known for their wide polydispersity. In this study, LS were fractionated by ultrafiltration (UF) and based on their solubility in ethanol (EtOH) solutions. The combination of both methods leads to a set of fractions of varying properties, suitable for several applications. UF gives well-separated fractions, with low polydispersity, and increasing functionality (sulfonate and phenolic hydroxyl groups) with decreasing molecular weight (MW). EtOH solubility yields more polydisperse fractions but still appears to be an easy and rapid way to obtain fractions with increasing MW. The residual sugars in LS, resulting from incomplete removal of hemicelluloses, were found to be mainly in the form of low MW oligomers, which were not bound chemically to lignin. Thermal degradation of the different fractions was also compared, giving better comprehension of the influence of the structure and composition. A glass transition temperature (Tg) could be measured for some fractions and was correlated to their MW.

scholarly journals Experimental Cold-Cured Nanostructured Epoxy-Based Hybrid Formulations: Properties and Durability Performance

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 476 ◽  
Author(s):  
Mariaenrica Frigione ◽  
Mariateresa Lettieri ◽  
Francesca Lionetto ◽  
Leno Mascia
Keyword(s):  
Mechanical Properties ◽  
Glass Transition ◽  
Transition Temperature ◽  
Glass Transition Temperature ◽  
Thermogravimetric Analysis ◽  
Low Temperature ◽  
Thermal Degradation ◽  
Ambient Temperature ◽  
Durability Performance ◽  
Different Levels

Different hybrid epoxy formulations were produced and cold-cured, monitoring the properties development during low temperature curing and aging. All systems were based on silane functionalized bis-phenol A (DGEBA) resins (Part A), cured at ambient temperature with two amine hardeners (Part B). The different components of the formulations were selected on their potential capability to bring about enhancements in the glass transition temperature. The durability of the produced hybrids was probed in comparison to the corresponding neat epoxies by monitoring changes in glass transition temperature (Tg) and flexural mechanical properties after exposure to different levels of humidity and immersion in water and at temperatures slightly higher than the local ambient temperature, in order to simulate the conditions encountered during summer seasons in very humid environments. The thermal degradation resistance of the hybrid systems was also evaluated by thermogravimetric analysis.

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