Table of Contents
What property makes Bakelite so hard?
It is liquefiable and malleable when heated and becomes permanently hard and rigid on cooling. Hence, it is a thermosetting plastic. It can be easily molded and hence is used in the making of various products.
What are 4 properties of polymers?
Properties of polymers such as high tensile strength, strain, elasticity, toughness determine their uses. More complex polymers form strong bonds, and hence, they are strong enough to withstand high force and pressure.
How is Bakelite prepared give its important uses?
It is prepared from the monomers such as phenol and formaldehyde. The condensalion polymerisation take place in the presence of acid or base catalyst. 2. Phenol reacts with methanal to form ortho or para hydroxyl methyl phenols which on further reaction with phenol gives linear polymer called novolac.
Why is Bakelite an insulator?
Bakelite is an insulator because it has very high resistance. It is a thermosetting polymer and has high strength. It is used for making electric goods such as switches.
What makes Bakelite a strong material explain?
A hard, infusible, and chemically resistant plastic, Bakelite was based on a chemical combination of phenol and formaldehyde (phenol-formaldehyde resin), two compounds that were derived from coal tar and wood alcohol (methanol), respectively, at that time.
What are the special properties of polymers?
Some of the useful properties of various engineering polymers are high strength or modulus to weight ratios (light weight but comparatively stiff and strong), toughness, resilience, resistance to corrosion, lack of conductivity (heat and electrical), color, transparency, processing, and low cost.
What is structure of Bakelite?
The structure of bakelite is represented by option C. Bakelite is formaldehyde phenol polymer. Video Explanation.
What type of material is Bakelite?
Is Bakelite a good conductor of heat?
Reason: Bakelite is a poor conductor of heat and electricity.
Is Bakelite a non conductor of heat?
Bakelite is a thermosetting plastic which is one of the first plastics made from synthetic components. It’s used for its electrical non-conductivity and heat-resistant properties in electrical insulators, radio, and telephone casings.
Why is Bakelite hard and brittle?
In the case of Bakelite, the crosslink density is high, which is the reason for its hardness and rigidity. The shorter version of the short answer is that Bakelite has crosslinks but PVC doesn’t.
Is Bakelite a good conductor of electricity?
What are properties of plastic?
Properties of Plastics
- They are light in weight and are chemically stable.
- Easily moulded into different shapes and sizes.
- Good insulation and low thermal conductivity.
- Good impact resistance and they do not rust.
- Good transparency and wear resistance.
- Poor dimensional stability and can be easily deformed.
What are the properties of most polymers?
Heat capacity/ Heat conductivity. The extent to which the plastic or polymer acts as an effective insulator against the flow of heat.
What are the two important properties of polymers in terms of structure?
Polymers always have at least two phases namely, amorphous and crystalline. It is not its Tg, but rather its crystallinity that determines whether the material is a plastic or rubber. The crystals (hard phases) and rubbery (soft phases) make the PE behave as a plastic with toughness, and not as a rubber.
What are the properties of Bakelite?
Some important properties of bakelite are listed below. It can be quickly molded. Very smooth molding can be obtained from this polymer. Bakelite moldings are heat-resistant and scratch-resistant. They are also resistant to several destructive solvents.
Why is Bakelite used as an electrical insulator?
Bakelite is a non-conductive and heat resistant material makes it ideal for electrical insulators. It was used for its non-conductive and heat-resistant properties in electrical insulators, and also in radios and telephones. It was also used in other diverse products such as jewellery, kitchenware, and toys.
What are Bakelite thermosets filled with?
PF is the original Bakelite and is usually filled with 50–70% wood flour for moulded non-stressed or lightly stressed parts. Other fillers are: mica for electrical parts; asbestos for heat resistance; glass fibre for strength and electrical properties; nylon; and graphite. Phenolics represent one of the best thermosets for low creep.
Is Bakelite a collectible?
Collectible status. Bakelite items, particularly jewelry and radios, have become a popular collectible. The term Bakelite is sometimes used in the resale market to indicate various types of early plastics, including Catalin and Faturan, which may be brightly colored, as well as items made of Bakelite material.