Investigation of thermal and thermooxidative degradation of some polyimides containing oxyphenylene groups in the main chain

Sazanov, Yu. N.; Florinsky, F. S.; Koton, M.M.

doi:10.1016/0014-3057(79)90032-6

Cited by 27 publications

(23 citation statements)

References 4 publications

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“…can break the degraded plastic into progressively smaller particles (GESAMP, 2015;Scalenghe, 2018). The abiotic degradation reactions of polymers can be classified as thermal, mechanical, and chemical degradation (photodegradation, thermo-oxidation, photo-oxidation) (Sazanov et al, 1979;Scott, 1995;Kamo et al, 2004;Li et al, 2004;Chen et al, 2018).…”

Section: Abiotic Degradationmentioning

confidence: 99%

Marine Environmental Plastic Pollution: Mitigation by Microorganism Degradation and Recycling Valorization

et al. 2020

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Plastics are very useful materials and present numerous advantages in the daily life of individuals and society. However, plastics are accumulating in the environment and due to their low biodegradability rate, this problem will persist for centuries. Until recently, oceans were treated as places to dispose of litter, thus the persistent substances are causing serious pollution issues. Plastic and microplastic waste has a negative environmental, social, and economic impact, e.g., causing injury/death to marine organisms and entering the food chain, which leads to health problems. The development of solutions and methods to mitigate marine (micro)plastic pollution is in high demand. There is a knowledge gap in this field, reason why research on this thematic is increasing. Recent studies reported the biodegradation of some types of polymers using different bacteria, biofilm forming bacteria, bacterial consortia, and fungi. Biodegradation is influenced by several factors, from the type of microorganism to the type of polymers, their physicochemical properties, and the environment conditions (e.g., temperature, pH, UV radiation). Currently, green environmentally friendly alternatives to plastic made from renewable feedstocks are starting to enter the market. This review covers the period from 1964 to April 2020 and comprehensively gathers investigation on marine plastic and microplastic pollution, negative consequences of plastic use, and bioplastic production. It lists the most useful methods for plastic degradation and recycling valorization, including degradation mediated by microorganisms (biodegradation) and the methods used to detect and analyze the biodegradation.

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Section: Abiotic Degradationmentioning

confidence: 99%

Marine Environmental Plastic Pollution: Mitigation by Microorganism Degradation and Recycling Valorization

et al. 2020

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“…The ratio of constants k3 obtained under second-and pseudo-first-order reaction conditions (k3'(11)/ k,'(I)) decreases t o some degree compared with the ratio k2/hz', b u t remains significant (2.5 t o 5 ) for ortho-substituted adipates. This is in [16] who found pentafluorophenyl esters more reactive (the aminolysis in THF was studied). Higher activity of 2,4-dinitrophenyl ester compared with pentafluorophenyl analogous was confirmed b y additional data, in particular in THF (Table 5).…”

Section: K' = K / ( [ a ] [Hmpt])mentioning

confidence: 93%

Synthesis of polyamides by active polycondensation. The structural and kinetical aspects of active esters aminolysis reactions

et al. 1988

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“…However, the crosslinked networks might counteract thermal fragmentation without volatile compounds formation, and that was with crosslinking reactions, the characteristic weight loss of the Cu-PIs showed a more moderate trend [36], which could be clearly recognized in Figure 4. On the other hand, the use of PyBI as a stiff unit increased the π-electron system, which led to a rapid conduction of heat between chemical bonds and alleviated the polymer degradation in a high temperature [37]. Therefore, the observed T 5% of the Cu-PIs under a nitrogen atmosphere maintained beyond 500 • C. Further, more metal-crosslinking might reserve Cu 2+ in the materials to a considerable extent and more residues could be left.…”

Section: Physical Properties Of Pismentioning

confidence: 99%

“…Polymers 2020, 12, x FOR PEER REVIEW 7 of 10 [36], which could be clearly recognized in Figure 4. On the other hand, the use of PyBI as a stiff unit increased the -electron system, which led to a rapid conduction of heat between chemical bonds and alleviated the polymer degradation in a high temperature [37]. Therefore, the observed T5% of the Cu-PIs under a nitrogen atmosphere maintained beyond 500 °C.…”

Section: Physical Properties Of Pismentioning

confidence: 99%

Synthesis of Superheat-Resistant Polyimides with Enhanced Dielectric Constant by Introduction of Cu(ΙΙ)-Coordination

Qian

Zhang

et al. 2020

Polymers

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To achieve polyimide-metal complexes with enhanced properties, 5-amine-2-(5-aminopyridin-2-yl)-1-methyl-benzimidazole (PyMePABZ) that contains stiff 2-(2′-pyridyl)benzimidazole (PyBI) was synthesized and exploited to construct the Cu(ΙΙ)-crosslinked polyimides (Cu-PIs). These Cu-PIs exhibited higher dielectric, thermal, and mechanical properties with an increase in Cu2+ content. Among them, their dielectric constants (εrS) were up to 43% superior to that of the neat PI, glass transition temperatures (Tgs) were all over 400 °C, and 5% weight loss temperature (T5%) maintained beyond 500 °C. These data indicate that the metal coordination crosslinking provided a useful guide to develop high performance PIs which possess potential application as useful high temperature capacitors.

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Investigation of thermal and thermooxidative degradation of some polyimides containing oxyphenylene groups in the main chain

Cited by 27 publications

References 4 publications

Marine Environmental Plastic Pollution: Mitigation by Microorganism Degradation and Recycling Valorization

Marine Environmental Plastic Pollution: Mitigation by Microorganism Degradation and Recycling Valorization

Synthesis of polyamides by active polycondensation. The structural and kinetical aspects of active esters aminolysis reactions

Synthesis of Superheat-Resistant Polyimides with Enhanced Dielectric Constant by Introduction of Cu(ΙΙ)-Coordination

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