Applications Of Plastics: Properties, Uses, Packaging, Facts, FAQs

Plastics

Plastics are synthetic or semi-synthetic polymer materials , basically they’re able to be bent into different shapes when heated, then they get hardened back into useful things. Most of the time they come from petrochemicals that are obtained from crude oil, natural gas, or even renewable feedstocks, kind of a mix. What really defines plastics is that they have long chains made of repeating units, these so-called polymer chains, and that structure is what gives them those special traits like flexibility, durability, a lightweight nature , and resistance to corrosion.

Because they’re so versatile and usually cheap to produce, plastics have turned into one of the most widely used materials out there. You’ll find them in packaging, building work, transportation systems, healthcare, electronics, farming , and a huge number of everyday household items. Depending on how they behave when exposed to heat, plastics are generally sorted into two groups: thermoplastics and thermosetting plastics.

Thermoplastics Plastics

Thermoplastics are a kind of plastic that soften when they get heated, then they harden again once they cool down. And yes, you can do this again and again, over and over, without really causing major chemical changes in the material. Because of that , thermoplastics are pretty easy to mold, reshape, and then later recycle, too. In general, thermoplastics are made of long polymer chains that are basically kept in place by weaker intermolecular attractions. When heat is added, those attractions weaken, so the material turns softer and more bent. Then when it cools , the attractions come back stronger, and the plastic returns to its solid shape, as if nothing happened.

Thermosetting Plastics

Thermosetting plastics, also known as thermosets, are basically one class of plastics that undergo a permanent chemical shift when they are heated during manufacture. After they’re moulded and hardened, you don't really get to soften them again, you can’t re shape them or remould them just by reheating. The reason is that strong cross-links form between the polymer chains, and that ends up locking everything into a rigid, three-dimensional network.

Properties of Plastics

Plastics are polymeric materials that possess a unique combination of physical and chemical properties.

1. Lightweight

Plastics have low density so they are much lighter than metals, glass, and many other materials. This makes them easy to use and transport.

2. Durable and Strong

Most plastics are strong, tough, and pretty good at resisting wear and tear, because they can take mechanical stress without too much fuss. They usually have a long service life, which is kinda convenient for a lot of uses.

3. Corrosion Resistant

Unlike metals, plastics do not rust or corrode when they get exposed to moisture, chemicals,or various environmental conditions

4. Good Electrical Insulators

Plastics are poor conductors of electricity, so they end up being ideal for electrical insulation in wires, cables, switches and electronic devices.

5. Easily Moulded and Shaped

Plastics can be moulded into any shape and complex designs easily, allowing manufacturers to produce a variety of products.

6. Recyclability

A lot of thermoplastics actually can be recycled and reused, too, which helps conserve resources and cut down on environmental waste, overall. It’s important because without that cycle, we end up wasting more than we should.

Application of Plastics

Applications of Plastics at Home

• Plastics are pretty extensively used in household stuff, like everyday products and appliances. In modern homes, there’s usually a significant amount of plastic sitting around in televisions, sound systems, mobile phones, vacuum cleaners, furniture, kitchenware, and storage containers.
• Plastic chairs, bar stools, acrylic composite worktops, non-stick cookware that has PTFE coatings, water pipes, and electrical fittings are common examples of plastic items found inside houses. Their durability, easy upkeep, and the pleasant look they bring make them very well suited for domestic use.

Automotive and Transport

• Plastics have contributed to many of the innovations in automotive design, like improvements in safety, performance, and fuel efficiency.

• Plastics are also used in trains, planes, automobiles, and even ships, satellites, and space stations. Bumpers, dashboards, engine components, seating, and doors are a few examples of plastic.

Construction Sector

• Plastics are used in several ways in the construction field because they have a high degree of versatility and combine excellent strength-to-weight ratio, durability, cost-effectiveness, low maintenance, and corrosion resistance, which make plastics an economically appealing choice in the construction industry.

Applications of Plastics in Packaging

• Packaging is one of the largest applications of plastics worldwide. Various types of plastics are used to package, store, transport, and serve food, beverages, medicines, and consumer goods.
• Plastic containers, bottles, wraps, pouches, and films are often chosen because they are lightweight, chemically resistant, and tough. A lot of plastic packaging materials are made so they can handle microwave heating, so they can go from freezer to microwave, and still work in a dishwasher too. This makes them quite useful for consumers.

Sports Safety Gear

• Sports safety gear is lighter and also tougher, like plastic helmets, mouth guards, goggles, and protective padding, so nobody gets hurt.
• Moulded shock absorbent plastic foam helps keep feet steady and well supported, while hard plastic shell covers on helmets and pads protect heads, joints, and bones, etc.

Medical field

• The medical world sort of leans on plastics a lot for making safe, hygienic and, yes, cost-effective equipment and devices.
• It is used in surgical gloves, syringes, insulin pens, IV tubes, catheters, blood bags, dialysis machines, heart valves, artificial limbs, wound dressings, and a bunch of different diagnostic tools. What really matters is that they’re not easily compromised in sterilization, they stay flexible, and they resist chemicals well, so they’re basically essential for modern health care and ongoing medical treatments.

Facts about Plastics

• Bakelite is the first completely synthetic plastic, which was created in 1907 by Leo Baekeland; he coined the term “plastics.”

• The term “plastic” is derived from the Greek word plastikos. This means “able to be shaped or moulded.”

• Packaging accounts for one-third of all plastic produced.

• In general, pure plastics are insoluble in water and nontoxic, as many of the additives in plastics are toxic and may leach into the environment. Toxic additives are an example of phthalates.

Also read

Some Solved Examples

Question 1: Which of the following plastics is commonly used in the manufacture of electrical switches and plugs due to its excellent heat resistance and insulating properties?

A. Polyethylene (PE)
B. Polyvinyl Chloride (PVC)
C. Bakelite
D. Polystyrene (PS)

Solution:

Bakelite is a thermosetting plastic that does not soften on heating. It has excellent electrical insulating properties and heat resistance, making it suitable for electrical switches, plugs, and handles of cooking utensils.

Hence, the correct answer is option (c)

Question 2: The primary reason for the extensive use of plastics in automobile manufacturing is:

A. High density and conductivity
B. Lightweight nature and corrosion resistance
C. High melting point only
D. Ability to absorb moisture

Solution:

Plastics reduce the overall weight of vehicles, improving fuel efficiency. They are also resistant to corrosion, unlike many metals. Therefore, plastics are widely used in dashboards, bumpers, fuel tanks, and interior components.

Hence, the correct answer is option (B)

Question 3: Which property of plastics makes them suitable for packaging food and beverages?

A. High electrical conductivity
B. Magnetic nature
C. Chemical inertness and moisture resistance
D. High thermal conductivity

Solution:

Food packaging materials should not react with food products. Most plastics are chemically inert and moisture-resistant, making them ideal for packaging and storage applications.

Hence, the correct answer is option (C)

Question 4: A polymer used in making non-stick cookware coatings is:

A. Nylon
B. PVC
C. PTFE (Teflon)
D. Bakelite

Solution:

PTFE (Polytetrafluoroethylene) is highly resistant to chemicals and has a very low coefficient of friction, making it suitable for non-stick coatings in cooking pans.

Hence, the correct answer is option (C)

Practice More Questions from the link given below: