Q
which of the following statements is not true of cellulose
I'm a seasoned industrial engineer with a keen interest in machine learning. Here to share insights on latest industry trends.
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Dying coffee filters can add a creative touch to crafts and decorations. Here's how to do it: First, choose your dye. Food coloring, water-based paints, or fabric dye work well. Prepare your dye in a bowl, mixing it with water until you achieve the desired color intensity. Next, dip your coffee filters into the dye. You can fully submerge them or dip the edges for a gradient effect. Remove the filters and gently squeeze out excess dye. Finally, lay them out to dry on a flat surface covered with newspapers or a plastic sheet. Ensure they are completely dry before using them in your projects. Feel free to experiment with different colors and dipping techniques to achieve unique effects!
Polytetrafluoroethylene (PTFE) is a synthetic polymer characterized by its high molecular weight and consists of carbon and fluorine. Belonging to a class of polymers known as fluoropolymers, PTFE is most well-known for its exceptional chemical resistance, high-temperature stability, and low friction properties. It was first discovered in 1938 by Dr. Roy Plunkett while he was working at DuPont. Structurally, the carbon-fluorine bonds in PTFE are among the strongest in organic chemistry, contributing to its inertness towards almost all chemicals. This unique combination of properties makes PTFE an ideal material for a wide range of applications, from non-stick cooking surfaces and chemical container linings to use in aerospace components and medical devices. Its versatility and durability have cemented PTFE's position as a critical material in many industries.
Polyethylene (PE), a versatile and widely used plastic, exhibits good chemical resistance to a broad range of substances, including many acids. Its resistance includes both high-density polyethylene (HDPE) and low-density polyethylene (LDPE), which are commonly utilized in containers, pipes, and liners specifically because of their resilience to corrosive environments. However, this resistance is not absolute for all conditions or acids. Strong oxidizing acids, such as concentrated sulfuric acid, can attack polyethylene, especially at elevated temperatures. The extent of resistance also depends on factors such as the concentration of the acid, temperature, and exposure time. Generally, for household acids or dilute industrial acids at room temperature, polyethylene containers are considered suitable. But for high-concentration acids, high temperatures, or long-term storage, it's vital to consult specific chemical resistance charts or manufacturers' recommendations to ensure compatibility and safety.
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