Thermal and thermal-oxidative degradation of some polybenzimidazoles at high temperatures

1970 ◽  
Vol 12 (8) ◽  
pp. 2103-2109 ◽  
Author(s):  
V.V. Rode ◽  
N.M. Kotsoyeva ◽  
G.M. Cherkasova ◽  
D.S. Tugushi ◽  
G.M. Tseitlin ◽  
...  
Keyword(s):  
High Temperatures ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation

scholarly journals Evidence from Thermal Aging Indicating That the Synergistic Effect of Glyoxal and Sodium Sulfite Improved the Thermal Stability of Conformational Modified Xanthan Gum

Polymers ◽  
2022 ◽  
Vol 14 (2) ◽  
pp. 243
Author(s):  
Shuai Yuan ◽  
Jiayuan Liang ◽  
Yanmin Zhang ◽  
Hongyu Han ◽  
Tianyi Jiang ◽  
...  
Keyword(s):  
Thermal Stability ◽  
Production Process ◽  
High Temperatures ◽  
Conformational Changes ◽  
Xanthan Gum ◽  
Sodium Sulfite ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation ◽  
Original Strain ◽  
Thermal Stability Of

Xanthan gum is prone to thermal oxidative degradation, which limits its applications. However, conformational changes in xanthan gum and appropriate stabilizers may improve its thermal stability. Therefore, in this study, we aimed to establish a strategy to maintain the viscosity of xanthan gum during long-term storage at high temperatures. We modified the original strain used for xanthan gum production by genetic engineering and added stabilizers during the production process. The structure and thermal stability of the resulting xanthan gum samples were then determined. Pyruvyl deficiency, combined with the addition of sodium sulfite and glyoxal during the production process, was found to significantly improve the maintenance of viscosity. The apparent viscosity of the new xanthan gum solution remained above 100 mPa·s after being stored at 90 °C for 48 days. Fourier-transform infrared spectra and scanning electron microscopy images showed that pyruvate-free xanthan gum with added stabilizers had more extensive cross-linking than natural xanthan gum. In conclusion, these findings may contribute to the use of xanthan gum in applications that require high temperatures for a long period of time.

Structural Performance of Pultruded Composites under Elevated Temperatures

2009 ◽  
Vol 79-82 ◽  
pp. 2223-2226
Author(s):  
Ayman S. Mosallam
Keyword(s):  
Elevated Temperature ◽  
High Temperatures ◽  
Elevated Temperatures ◽  
Oxidative Degradation ◽  
Viscoelastic Behavior ◽  
Structural Performance ◽  
Crystalline Polymers ◽  
Damage To The Material ◽  
Continuous Working ◽  
Pultruded Composites

One of the major limitations for wider use of pultruded fiber reinforced polymeric (PFRP) composites in the civil engineering sector has been their behavior under elevated temperature and ultimately fire. This limitation arises not only due to the reduction in mechanical properties at high temperatures, including increased propensity to creep, but also due to limitations on the continuous working temperature causing permanent damage to the material as a result of thermal and oxidative degradation. Significant gains in property retention at high temperatures with crystalline polymers have been derived from the incorporation of fibrous reinforcement, but the development of new polymer matrices is the key for further elevation of the useful temperature range. This paper presents summary results of a research project focused on characterizing the viscoelastic behavior of commercially-produced, off-the-shelf unidirectional PFRP materials subjected to elevated temperature environments.

Thermal-oxidative degradation of a styrene-butadienestyrene rubber graft copolymer

1968 ◽  
Vol 10 (11) ◽  
pp. 2870-2879 ◽  
Author(s):  
V.V. Rode ◽  
Yu.P. Novichenko ◽  
S.R. Rafikov
Keyword(s):  
Graft Copolymer ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation

Effect of alkylated diphenylamine on thermal-oxidative degradation behavior of poly-α-olefin

2015 ◽  
Vol 69 (7) ◽  
Author(s):  
Mian-Ran Chao ◽  
Wei-Min Li ◽  
Li-Li Zhu ◽  
Hai-Hong Ma ◽  
Xiao-Bo Wang
Keyword(s):  
Activation Energy ◽  
Oxidative Stability ◽  
Oxidative Degradation ◽  
Thermal Oxidative Degradation ◽  
Degradation Behavior ◽  
Thermal Oxidative Stability ◽  
Zinc Dialkyl Dithiophosphate ◽  
Dialkyl Dithiophosphate

AbstractAn oil-soluble antioxidant, alkylated diphenylamine (ADPA), was prepared by alkylation of diphenylamine. The influence of ADPA on the thermal-oxidative stability of poly-α-olefin (PAO8) was evaluated by thermogravimetry (TG). For comparison, the thermal-oxidative stability of PAO8 with zinc dialkyl dithiophosphate (ZDDP) was also investigated. Activation energy (E

Thermal and thermal-oxidative degradation of polycyanates

1974 ◽  
Vol 16 (1) ◽  
pp. 15-23 ◽  
Author(s):  
V.V. Korshak ◽  
P.N. Gribkova ◽  
A.V. Dmitrenko ◽  
A.G. Puchin ◽  
V.A. Pankratov ◽  
...  
Keyword(s):  
Oxidative Degradation ◽  
Thermal Oxidative Degradation
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