Plastics and Polymers

The category should be plastics and polymers. We have a category of metals under chemistry. Plastics and polymers are the fasting growing category of materials. A Styrofoam cup is a plastic or polymer for example.

Asked in Biology, Plastics and Polymers

Is a plastic bag selectively permeable?

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There are different types of plastics and most of them are nor permeable or selectively permeable .Cellophane is a specific plastic used in biological experiments as it is selectively permeable .
Asked in Plastics and Polymers

What will burn faster wood or plastic?

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wood will burn faster because plastic grows it is like a body has a bone system I don't know what 'bone system' is being refered to. Some plastics burn much faster than wood; eg unmodified polystyrene burns vigorously.
Asked in Plastics and Polymers

Is lactose a polymer?

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No, it is a dimer molecule.
Asked in Pollution, Waste and Recycling, Plastics and Polymers

Why is not advisable to burn solid wastes especially those made of plastics?

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The burning of plastics is known to produce carenogens (cancer causing dioxins). Some plastics, especially those used in older computers and some older electronics contain brominated flame retardants, of which the health side effects are unknown. Plastics are further manufactured from Oil (long chain polymers), hence when burnt, give off carbon dioxide. A known side effect of this (other than global warming) is the acidification of rain, which during the 1980's caused mass deforestaton in skandinavia.
Asked in Geology, The Difference Between, Plastics and Polymers

Is plastic harder than rubber?

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Yes! Depends which plastic and which rubber you are talking about. It really is quite alarming how people use terms like "Plastic" and "rubber" when there are HUGE numbers of massively different products falling under each category. You wouldn't say "Come round for dinner tonight, we're having 'food' followed by 'food' and then some 'food' for dessert" would you??
Asked in Consumer Electronics, Physics, Chemistry, Plastics and Polymers

Why electrocaloric effect observed in ferroelectric polymers only?

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Its not true that electrocaloric effect (ECE) is observed only in ferroelectric polymers. ECE can be found in any typical dielectric material. If polarization switches from one direction to the other upon application or withdrawl of electric filed, the temperature of the material changes. It happens both in organic as well as inorganic materials. It is found that the EC coefficent is high near ferroelectric phase transition temperature.
Asked in Chemistry, Plastics and Polymers

Why are the little styrofoam pieces called peanuts?

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Originally shaped like peanuts in the shell
Asked in Waste and Recycling, Green Living, Plastics and Polymers

Why should people pay 5 cents for plastic bags?

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So the people selling you the plastic bags can become richer while sounding environmentally friendly
Asked in Cleaning, Plastics and Polymers

How do you remove melted plastic from material?

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One time I used a sheet of paper and an iron. Lay the sheet of paper over it and take a hot iron and put over the paper. It will melt the plastic and it will stick to the paper. I am not sure about melted plastic, but I've removed dried wax from fabric by placing a brown paper bag (usually a lunch bag) on top of the wax (or plastic in your case) and running a medium heat iron over the bag. The wax came off, so maybe it will work for melted plastic.
Asked in Waste and Recycling, Plastics and Polymers

What recycling bin do plastic bags go in?

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Plastic, I would assume. Some municipalities don't recycle plastic bags, an option is returning them to a store/supermarket that has a bag recycling bin near their entrance.
Asked in Earth Sciences, Environmental Issues, Plastics and Polymers

Is plastic renewable or nonrenewable?

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This is somewhat more complicated than it might seem. First as most plastics are produced from petroleum or natural gas, which are nonrenewable resources, the plastics are nonrenewable. Second thermoplastics can be melted and recycled, but this is not true of thermoset plastics. But being recyclable does not make thermoplastics renewable. Only bioplastics (from living things, e.g. vegetable oils) are renewable, because their source chemicals can be grown.
Asked in Biology, Chemistry, Biochemistry, Plastics and Polymers

Is protein a condensation polymer?

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Yes, proteins are formed from amino acid monomers. The OH group on one end of the amino acid bonds with the hydrogen group on the other end to form a water molecule. Then the peptide bond forms (carbon-nitrogen-carbon)
Asked in Butter and Margarine, Plastics and Polymers

Is margarine plastic?

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Do you mean "is margarine plastic" or do you mean "is margarine a plastic"? If you mean "is margarine plastic?" then the answer is "yes", because one of the meanings of the term "plastic" is something that is easily deformed, shaped, or moulded. If, on the other hand, you mean "is margarine a plastic?" then the answer is "no, it's a derivative of vegetable oil used as a lower cost alternative to butter".
Asked in Sewing, Shoes, Men's Clothing, Plastics and Polymers

Where can you find the tool for fastening a plastic aglet to shoelaces?

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According to Ian's shoelace site, you don't need a tool. There are many ways of fastening aglets, for plastic, you simply wrap, and melt. For more info, see the link I have provided.
Asked in Plastics and Polymers

Can you clear coat over epoxy?

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You should always check for compatibility of the products you are using, but epoxy coating can and probably should be top-coated with a polyurethane product. Epoxies are not UV stable and will yellow over time exposed to sunlight. Additionally, epoxy is a hard material that scratches easily. A polyurethane top-coat is more difficult to scratch and is UV stable. It will also provide a very rich deep shine to your coating.
Asked in Plastics and Polymers

Is graphite a polymer?

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It is NOT a polymer, just carbon in solid form.
Asked in Plastics and Polymers

Does plastic attract to a magnet?

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No, it does not. A magnet produces a magnetic field, which attracts only ferromagnetic materials, such as iron, and also repels other magnets. Other ferromagnetic materials include: cobalt, nickel, iron, some alloys of rarer earth metals as well as natural minerals, such as lodestone.
Asked in Chemistry, Acids and Bases, Plastics and Polymers

Why is a polystyrene cup used instead of a glass beaker to find the heat of neutralization?

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Because it insulates. To measure the heat of neutralization, the heat absorbed or released by the reaction are measured by a change in temperature. If heat is released into the room through the container, the measurement won't be accurate. The better insulated, the better.
Asked in Plastics and Polymers

What is an example of a polymer?

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A polymer is a large molecule composed of repeating structural units typically connected by covalent chemical bonds. Some examples are as follows Plastics DNA rubbers