Question

what are bio degradable materials classes 6th cbse​

Answer 1

Answer:

Biodegradable waste includes any organic matter in waste which can be broken down into carbon dioxide, water, methane or simple organic molecules by micro-organisms and other living things by composting, aerobic digestion, anaerobic digestion or similar processes....

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Answer 2

Answer:

Explanation:

Biodegradable materials, by definition, change their chemical and potentially physical form upon contact with the biological environment. There are two distinct stages to the biodegradation process, especially in bulk degradation. The first stage is restricted to the random cleavage of molecular linkages. The resulting decrease in molecular weight produces some change in mechanical properties and morphology, but no weight loss (Brannon-Peppas 1997). The second stage involves a measurable weight loss in addition to chain cleavage. It begins when the molecular weight of the polymer has decreased to the point that chain scission produces oligomers that are small enough to solubilize and diffuse out from the network. These oligomers are necessarily released into the adjacent tissue and therefore should be biocompatible.

The predominant means by which polymers degrade is by hydrolytic degradation, enzymatic degradation, or a combination of the two. The degree to which each type of degradation contributes to the degradation of a specific polymer may vary during the degradation process. It is dependent upon many factors, but especially the environment in which the degradation is taking place.

Polymers which degrade by hydrolysis include poly(lactic acid), poly(glycolic acid), poly(caprolactone), polyanhydride, poly(ortho ester), and polycyanoacrylate. Many poly(amino acids) such as poly(L-lysine), poly(L-arginine), poly(L-aspartic acid), poly(L-glutamic acid), and poly[N-(2-hydroxyethyl)-L-glutamine] are enzymatically degradable (Brannon-Peppas 1995).

After degradation has occurred, it is essential that the products of the degradation be resorbed or eliminated from the body. For formulations that have been administered orally, the elimination of the polymers follow natural processes. However, biodegradable polymers used parenterally, or in other invasive techniques, require more analysis and design to ensure fully biodegradable formulations (Brannon-Peppas and Vert 2000). In order for this elimination to occur, the degradation byproducts—often small molecular weight polymer chains—must first be solubilized before they can be eliminated. For the more water-soluble polymer fragments, this is a fairly straightforward process. Other materials must first be ionized before solubilization can occur.