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What are the problems with polymers?

What are the problems with polymers? Most polymers, including poly(ethene) and poly(propene) are not biodegradable . This means that microorganisms cannot break them down, so they: cause a litter problem if disposed of carelessly. last for many years in landfill sites.

What are the disadvantages of polymers?

The strength to size ratio of polymer is less while for metals is more. Cannot be machined easily and limited speed for machining for it. Heat capacity of polymer is very less so cannot be used in heat applications. Heavy structure cannot be made by polymer as the structural rigidity is very less.

What are the 7 types of plastic?

The Basics On 7 Common Types of Plastic

  • 1) Polyethylene Terephthalate (PET or PETE)
  • 2) High-Density Polyethylene (HDPE)
  • 3) Polyvinyl Chloride (PVC or Vinyl)
  • 4) Low-Density Polyethylene (LDPE)
  • 5) Polypropylene (PP)
  • 6) Polystyrene (PS or Styrofoam)
  • 7) Other.

What are the advantages and disadvantages of polymers?

They have relatively low melting and degredation temperatures, so this can be a limit for use at high temperatures. Some of polymers can degrade on sunlight and some of radiations. Strength and hardness is low compared with ceramics and metals. Modulus of elasticity or stiffness is generally low in polymers.

What are the disadvantages of synthetic polymers?

Some disadvantages of these polymers in tissue engineering applications are their poor biocompatibility, release of acidic degradation products, poor processability and loss of mechanical properties very early during degradation.

What are the downsides of using smart polymers?

In spite of these advantages several drawbacks associated with these systems include high-burst drug release, low mechanical strength of the gel leading to potential dose-dumping, lack of biocompatibility of the polymeric system and gradual lowering of pH of the system due to acidic degradation14,15.

What are polymers good for?

Polymers can be used to make items that have no alternatives from other materials. Polymers can be made into clear, waterproof films. PVC is used to make medical tubing and blood bags that extend the shelf life of blood and blood products.

What are the 2 main types of plastic?

There are two main types of plastics: thermoplastics and thermosets. Thermoplastics are by far the ones most studied in rheology, therefore, this section will focus only on the major types of thermoplastic material.

Which plastic is best?

3 types of plastic that are considered as safer options among the others are Polyethylene Terephthalate (PET), High-Density Polyethylene (2-HDPE), and Polypropylene (5-PP).

What are the main properties of plastic?

Properties of Plastics

  • They are light in weight and is 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 advantages of conducting polymers?

The biggest advantage of conductive polymers is their processability, mainly by dispersion. Conductive polymers are generally not thermoplastics, i.e., they are not thermoformable. But, like insulating polymers, they are organic materials.

What are the classification of polymers?

There are 3 principal classes of polymers – thermoplastics, thermosets, and elastomers. Differentiation between these classes is best defined by their behaviour under applied heat. Thermoplastic polymers can be either amorphous or crystalline.

What are the problems with synthetic polymers?

The non-biodegradable nature of synthetic polymers makes them a permanent waste. The used polymeric products like plastic bags and bottles cannot be dumped in sanitary landfills. These synthetic waste items are then combust in the incinerators which results in release of harmful gases and cause air pollution.

Why do we need synthetic polymers?

Society uses synthetic polymers because many of them have highly desirable properties: strength, flexibility, resistivity, chemical inertness and so forth.

What are the disadvantages of synthetic Fibres?

Disadvantages of Synthetic Fibres

  • Synthetic fibers require attention while ironing since they tend to melt away easily.
  • Most of these fibres absorb very little. So, they stick to the body while sweating on hot summer days. …
  • Synthetic fibers are prone to catch fire very easily.
  • These fibres are non-biodegradable.

What are the properties of smart polymers?

Smart polymers tend to have an all-or-nothing response, and are completely predictable, with the change being uniform throughout the material. They might alter their conformation, adhesiveness or water retention properties, and can return to their initial state when the stimulus ends.

What is a smart polymer GCSE?

Smart materials have properties that change in response to. their environment. Smart materials include hydrogels, packaging, shape memory alloys and shape memory polymers. An example of a shape memory polymer is called shrink-wrap.

What are 4 types of polymers?

Terms. Synthetic polymers are human-made polymers. From the utility point of view, they can be classified into four main categories: thermoplastics, thermosets, elastomers, and synthetic fibers.

What are polymers examples?

Examples of synthetic polymers include nylon, polyethylene, polyester, Teflon, and epoxy. Natural polymers occur in nature and can be extracted. They are often water-based. Examples of naturally occurring polymers are silk, wool, DNA, cellulose and proteins.

What is the revised classification of polymers?

The most common way of classifying polymers is to separate them into three groups – thermoplastics, thermosets, and elastomers. The thermoplastics can be divided into two types – those that are crystalline and those that are amorphous.

What’s the toughest plastic?

Polycarbonate is the strongest plastic that is 200 times stronger than glass and is warranted against breakage or cracks. With its high impact strength, it is ideal for structures that are in places where there is snow or hail so that the building is not impacted by such throws.

What is strong plastic called?

Acrylic and polycarbonate are transparent plastics that are stronger than many other clear plastic sheet materials and are often used in architectural glazing applications when transparency and superior mechanical properties are required. High strength, stiff, low friction engineering plastic with good wear properties.

What is the strongest clear plastic?

Polycarbonate: A Strong, Clear, Multi-Purpose Plastic

  • Polycarbonates (PC) are a group of strong, impact-resistant, heat-resistant, thermoplastics. …
  • PC plastics have characteristics similar to polymethyl methacrylate (PMMA or acrylic), but are stronger and better able to tolerate extreme temperatures.

Which plastic numbers to avoid?

To make a long story short: plastic recycling numbers 2, 4 and 5 are the safest. Whereas plastic numbers 1, 3, 6 and 7 must be avoided. But it does not indicate that you can fearlessly use safer plastic. All plastic products can leach toxic chemicals when heated or damaged.

What are 5 common plastics used in homes?

  • 5.1 Bakelite.
  • 5.2 Nylon.
  • 5.3 Poly(methyl methacrylate)
  • 5.4 Polystyrene.
  • 5.5 Polyvinyl chloride.
  • 5.6 Rubber.
  • 5.7 Synthetic rubber.

What are 10 items we use plastic for?

Here are 10 commonly used plastic items and the simple swaps that you can do in your everyday life to help the ocean:

  • Plastic Grocery Bags. …
  • Plastic Produce Bags. …
  • Plastic Straws. …
  • Plastic Water Bottles. …
  • Ziploc Baggies. …
  • Disposable Coffee Cups. …
  • Plastic Cutlery. …
  • Body Wash In Plastic Bottles.



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