Q
does cellulose acetate biodegrade
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Hydrolysis is a chemical reaction in which water is used to break bonds in molecules, leading to the decomposition of complex molecules into simpler ones. It is the reverse process of polymerization, where monomers combine to form polymers. During hydrolysis, water interacts with a polymer, breaking its long chains into monomers or smaller units. This process is crucial in the digestion of food, where large biomolecules like proteins and carbohydrates are broken down into their monomeric forms for absorption. Therefore, hydrolysis does not form polymers; instead, it breaks them down. For the synthesis or formation of polymers, reactions such as condensation polymerization are involved, where monomers bond together and release small molecules like water as byproducts.
Vanishing cream is a type of oil-in-water (O/W) emulsion. This formulation allows it to be lightweight and more easily absorbed into the skin compared to water-in-oil (W/O) counterparts. The term "vanishing" is derived from its ability to disappear into the skin upon application, leaving no greasy residue. Typically, these creams have a high water content, which helps in hydrating the skin, and they are often used as a base for makeup. Vanishing creams usually contain ingredients like stearic acid, which, when neutralized with a lye (sodium or potassium hydroxide), helps to emulsify the oil and water components. The unique characteristics of vanishing creams make them suitable for people with oily skin or those looking for a light moisturizer that doesn't leave the skin feeling sticky or heavy.
Yes, you can heat trace PVC pipe, but caution is needed due to PVC's lower heat tolerance compared to metal pipes. Heat tracing involves applying electrical heating elements along pipes to prevent freezing. PVC can withstand temperatures up to about 140°F (60°C). When selecting a heat trace system for PVC, ensure it's designed for low temperatures to avoid damaging the pipe. It's vital to closely follow the manufacturer's installation guidelines and use a thermostat-controlled system to prevent overheating. This approach is commonly used in cold climates to prevent water pipes from freezing without causing damage to the PVC material.
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