By Kalugina, Gumargalieva, Gennady Zaikov
This e-book offers research result of thermal ameliorations in thermoresistant polymers: polysulfones, polyester-imides, aliphatic-aromatic polyimides and polyamides, liquid-crystal fragrant co-polyesters, polyphenylquinoxalines at temperatures of fabrics and articles processing and operation. a big results of investigations is the decision of thermooxidative degradation regularities for aliphatic-aromatic heterochain polymers and outline of the degradation mechanism. The utilized element of this paintings is the method of stabilization of thermoresistant polymers and composite fabrics derived from them utilizing ingredients and research of the mechanism of high-temperature inhibited oxidation. The ebook offers effects that have been received via decades of analysis until eventually lately, quite often acquired via scientists of G.S. Petrov examine Institute of Polymeric fabrics (Moscow, Russia) â€“ one of many best Institutes during this department - that have now not been to be had in foreign clinical guides ahead of.
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Extra info for Thermal Stability of Engineering Heterochain Thermoresistant Polymers (New Concepts in Polymer Science)
Z. E. Zaikov 59 3. Transfer to electronically excited state Further stages of the process fit traditional radical-chain scheme with the full selection of appropriate degradation products. Thermal Stability of Engineering.. 60 . Chapter 2. Degradation of aliphatic-aromatic po1y amides This Chapter shows investigation results on two aliphatic-aromatic polyamides : Polyphthalamide 1 (PPA-1) -C II a fHN-(CH ) -NH-OC-(CH -CO-HN-(CH ) -NH- C 2 6 24 26 II 0 0 0 c-oII 0 basec, on terephthalic (TPA), isophthalic (IPA) and adipic (AA) acids, and hexamethylene diamine.
E. formation of this product would be clearly observed. Similar explanation may be given to the alternative of attack 1 - 4 with release of undecane pyromellitimide. However, pyromellite diimide is the unique heavy product of PA1 solid-phase oxidation. To put it differently, polymellit diimide formation testifies that, besides the mechanism of random 0 2 attacks along the macrochain, the mechanism of a-CH2-group oxidation activation in neighboring methylene chains, separated by pyromellitimide fragments, does exist or even dominates at relatively low temperatures.
Secondly, it may be explained by occurrence of new C=O-groups as the oxidation product. 4 1660 1720 I700 v, 1730 Clll Figure 15. High resolution (2 cm-I) Fourier IR-spectrum for PA1 before (1) and after (2) thermal oxidation in air at 350°C during 1 hour The literature shows investigations of aliphatic PA thermal oxidation by IR-spectroscopy [ 1501. The occurrence of new C=O-groups, resulted by lowtemperature oxidation of PA-6, PA-66, PA-1 1, PA-12, and the so-called “soluble” N-methoxymethylated PA-6 is displayed in absorption increase in the range of 1700 - 1750 cm-’ at the short-wave wing of the initial amide band.