Examples of degradable

Where oxygen is not available in free (or dissolved form), many anaerobic bacteria are capable of metabolism, by using alternate forms of electron acceptor compounds. An example of degradation is ... 

Autoxidation of 9-hydroxyellypticine (60) is a good example of degradation of phenols, showing the formation of a quinone-imine (XV) and an oxidative dimer (XVI, Fig. 12). Phenols can be quite stable in the protonated... 

Examples of degradation reactions are given here though they are not normally used as methods for the synthesis of pyrazines or pyrimidines. 

Trimethylaluminium can be used as a typical example of degradation reactions of trivalent organometallic compounds ... 

Examples of degradable, water-soluble polymers used for conjugation that have been clinically evaluated include poly(glutamic acid) [42-45] and co-blocked polymers of aspartic acid and PEG [46-48]. These are poly(amino acid)-derived polymers so they have amide bonds. While these polymers are susceptible to enzymatic degradation [49], they are not as hydrolytically acid-labile npon parenteral administration as polyacetals wonld be. 

Examples of Degradation Processes of Biotechnological Product Components during Thermal Drying... 

In degradation by substituent reactions, the substituents attached to the polymer-chain backbone are modified or eliminated. Any volatile products evolved will therefore be chemically unlike monomer. The most prominent example of degradation via substituent reaction is poly(vinyl chloride) (PVC). Like all thermoplastics, PVC is processed at about 200 °C at which temperature it loses HCl quite rapidly and is converted to a deeply colored polyene polymer, i.e.,... 

Several processes are caused by the action of detrimental agents from the environment. Corrosion of reinforcement and cement matrix, leaching, excessive abrasion and cavitation, overloading and impacts these are examples of degradation mechanisms acting simnltaneously with normal wear from external loads, and are accelerated by existing crack systems. 

In oxidized polyolefins typical carbonyl compounds in the region of 1640-1740 cm can be observed. Figure 3.1 shows an example of degraded LDPE containing a masterbatch of corn starch, linear LDPE and styrenebutadiene copolymer compared with commercial LDPE. This shows that LDPE containing the starch-prooxidant mixture is clearly more susceptible to biodegradation compared to pure LDPE. 

The purpose of providing a brief overview on recent reviews of nanocomposite materials that discuss synthesis, structure properties, and applications is to bring to the reader s attention the nascence of this field and justify the rare availability of degradation studies of these materials when we have only recently embarked on our journey to understanding the fundamentals about them. Nevertheless, a few examples of degradation studies of nanocomposite materials are provided with the hope of advances towards mechanistic aspects of degradation with nanomaterials components. Chrisaffis et al [56, 57] report studies on the decomposition mechanisms of syndiotactic polystyrene (sPS) nanocomposites with two different types of nano fillers multi-walled carbon nanotubes (MWCNTs) and carbon nanodiamonds (NDs). sPS is a semicrystalline polymer considered to be a... 

Typical examples of degradation phenomena include (1) carbon support oxidation/corrosion, (2) platinum dissolution/agglomeration, (3) chemical degradation of the electrolyte membrane, and (4) three-dimensional structural changes in the electrocatalyst layers, among others. These phenomena do not occur individually, but rather simultaneously and in a compound manner. 

All forms of degradation that could reasonably be expected to affect a vessel in any particular service. Examples of degradation mechanisms include internal or external corrosion or erosion, all forms of cracking (both internal and external), fatigue, embrittlement, creep, high temperature, and hydrogen attack. 

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