list advantages and disadvantages of thermosetting and thermoplastic
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Answer:
Thermoset, or thermosetting, plastics are synthetic materials that strengthen during being heated, but cannot be successfully remolded or reheated after their initial heat-forming. This is in contrast to thermoplastics, which soften when heated and harden and strengthen after cooling. Thermoplastics can be heated, shaped and cooled as often as necessary without causing a chemical change, while thermosetting plastics will burn when heated after the initial molding. Additionally, thermoplastics tend to be easier to mold than thermosetting plastics, which also take a longer time to produce (due to the time it takes to cure the heated material).
Thermosetting plastics, however, have a number of advantages. Unlike thermoplastics, they retain their strength and shape even when heated. This makes thermosetting plastics well-suited to the production of permanent components and large, solid shapes. Additionally, these components have excellent strength attributes (although they are brittle), and will not become weaker when the temperature increases.
DISADVANTAGES It is a compound that is indestructible, even when it is melted the compound gas that is gives off is very harmful to our heath and environment; it weakens the ozone layer. Most plastic is produced from oil. The world is gradually running out of oil. Scientists are now developing plastics that are made from vegetable oil and other organic matter. This means that the plastic is more likely to be degradable, so it will be less of a problem in future. Threatening Disadvantage Another disadvantage is pollution. Plastic accumulation in the environment is a looming catastrophe! Think about this: Plastics are manufactured from petroleum. This brings a host of issues (destruction of habitat, extraction of crude oil, security issues from the volatile countries where oil is produced, processing of petroleum, chemical manipulation into various types of plastics). The manufacture involves many chemicals, many of which have not been sufficiently tested for their toxicological impact on humans or animals. The final plastic product is often a chemical entity that in and of itself has had insufficient toxicological and ecotoxicological testing. An example would be PVC, forms of which are banned in Europe but exist widely in children's toys in America. Recent controversies over plastic bottles (many toxicologists recommending not re-using plastic water bottles and not storing food in Tupperware) have highlighted the potential risks.
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Answer:
Thermoset Pros2 Thermoset Cons2
More Resistant against high temperature Cannot be recycled.
Hard and rigid Much more difficult to surface finish.
Excellent aesthetics finishes Cannot be remolded or reshaped.
High mechanical property Poor thermal conductivity for housing. replacements.
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