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Copolymer: The polymerization between two or more monomers or monomers and polymers is called copolymerization, and the product obtained by copolymerization is a copolymer. Block copolymers, graft copolymers, random copolymers, regular copolymers, etc.
Homopolymer: A polymer formed by the polymerization of one monomer is called a homopolymer.
PP-H is homopolymer polypropylene (translucent), which is what we call Type I polypropylene. We can know that it is polymerized from a single polypropylene monomer and does not contain ethylene monomer in the molecular chain. The PP-H molecular chain has a high degree of regularity, so the material has high crystallinity, the highest stiffness, the highest chemical resistance and high temperature resistance, and the worst impact resistance.
PP-B is block copolymerized polypropylene (milky white), which is what we call Type II polypropylene. Its ethylene content is relatively high, generally 7-15%. In the molecular sequence, the probability that two ethylene monomers and three monomers are connected together is very high, indicating that ethylene monomers only exist in the block phase. The ethylene segments existing in the form of blocks greatly improve the impact strength of the material. However, because the isotacticity of the PP-H molecular chain cannot be reduced, the crystallinity, melting point and heat resistance of the material cannot be fundamentally improved. . PP-B pipe is a type of hot and cold water pipe. It is relatively cheap. Its heat resistance and pressure resistance are very different from PP-R.
The question "are amino acids far" seems to misunderstand or misphrase the query regarding amino acids. Amino acids are the building blocks of proteins, essential for life on Earth, involved in various metabolic processes. They're not "far" in a spatial sense; rather, they're present everywhere in living organisms. From plants to animals, amino acids can be either produced by the organism (non-essential amino acids) or must be obtained through the diet (essential amino acids). In the context of dietary needs or the biochemical synthesis within organisms, amino acids are crucial and omnipresent, not distant or hard to find. Their ubiquity underscores their importance in nutrition, medicine, and biochemistry.
Polyethylene Glycol (PEG) is commonly used in eye care products, including lubricant eye drops and ointments, due to its effectiveness in relieving dryness and irritation. It is a polyether compound that can attract water, making it excellent for moisturizing and creating a protective film over the eye surface. When formulated for ophthalmic use, PEG is generally considered safe and has minimal risk of adverse effects. However, as with any medication or product, individual reactions can vary. Those with sensitive eyes or allergies should consult with an eye care professional before use. Additionally, it's essential to follow the usage guidelines on the product packaging and not to use the eye drops if the seal is broken or the product is past its expiration date. Overall, PEG is a beneficial ingredient in eye care formulations, offering relief for dry and irritated eyes when used appropriately.
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