What is a monomer What is a polymer?
All monomers have the capacity to form chemical bonds to at least two other monomer molecules. monomers. Polymers are a class of synthetic substances composed of multiples of simpler units called monomers. Polymers are chains with an unspecified number of monomeric units.
How do monomers form polymers?
The monomers combine with each other via covalent bonds to form larger molecules known as polymers. In doing so, monomers release water molecules as byproducts. Thus, the monomers that are joined together are being dehydrated to allow for synthesis of a larger molecule.
How are polymers formed?
Polymers are formed by two main ways called addition and condensation polymerization. In addition, polymerization, an initiator (or catalyst) reacts with a starting monomer. The result of this initiation reaction is a monomer attached to the initiator with an unsatisfied bond.
How are polymers broken?
Polymers are broken down into monomers via hydrolysis reactions, in which a bond is broken, or lysed, by addition of a water molecule.
What are two types of polymers?
Polymers are of two types: naturally occurring and synthetic or man made.
Are Polymers man made?
Polymers are large molecules made up of long chains or networks of smaller molecules called monomers. Natural polymers include silk, hair, proteins and DNA, while synthetic (man-made) polymers include polyethylene, polypropylene and polyester.
Which is not a type of polymer?
Synthetic polymers are classified on the basis of their origin and are known as man-made polymers i.e. they are not classified on the basis of its application or its properties. Remaining all other polymers like rubbers, plastic or fibers are classified on the basis of their properties.
Which is the strongest Polymer Group?
In general strongest polymer group is ______a Thermoplasts b Ther.
What classification of polymer must it be?
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.
How you classify polymers on the basis of source?
1] Classification Based on Source
- (i) Natural polymers. The easiest way to classify polymers is their source of origin.
- (ii) Synthetic polymers.
- (iii) Semi-Synthetic polymers.
- (i) Linear polymers:
- (ii) Branch chain polymers:
- (iii) Crosslinked or Network polymers:
- i) Addition polymers:
- ii) Condensation polymers:
What is the use of polymer?
Uses of polymers
| Polymer | Properties | Uses |
|---|---|---|
| Poly(chloroethene) ‘PVC’ | Tough, electrical insulator, can be made hard or flexible | Insulation for electrical wires, windows, gutters, pipes |
| Poly(tetrafluoroethene) ‘PFTE’ | Slippery, chemically unreactive | Non-stick coatings for pans, containers for laboratory substances |
How do you classify plastics?
According to their characteristics, there are three types of classifications regarding plastics according to: their chemical structure, their polarity and their applications….According to their chemical structure and temperature behaviour, plastics can be divided into:
- thermoplastics.
- thermosets.
- elastomers.
What are plastics and how they are classified?
Plastics are usually classified by their chemical structure of the polymer’s backbone and side chains. Plastics can also be classified by the chemical process used in their synthesis, such as condensation, polyaddition, and cross-linking. There are two types of plastics: thermoplastics and thermosetting polymers.
What is the importance of classification of plastics?
Thermoplastics and thermosetting polymers One important classification of plastics is the degree to which the chemical processes used to make them are reversible or not. Thermoplastics do not undergo chemical change in their composition when heated and thus can be molded repeatedly.
How many types of plastics are there?
The seven types of plastic
- 1) Polyethylene Terephthalate (PETE) Can it be recycled?
- 2) High-Density Polyethylene (HDPE) Can it be recycled?
- 3) Polyvinyl Chloride (PVC – U) Can it be recycled?
- 5) Polypropylene (PP) Can it be recycled?
- 6) Polystyrene or Styrofoam (PS) Can it be recycled?
- 7) OTHER. Can it be recycled?
What is PE and PP plastic?
Polyethylene (PE) and Polypropylene (PP) are used in more than just poly bags. From stretch film to tape, plastic sheeting to strapping; plastic is everywhere.
What are the properties of plastics?
Plastics are generally low cost, easy to manufacture, durable, strong for their weight, electrically and thermally insulative, and resistant to shock, corrosion, chemicals, and water.
What are the 5 properties of plastic?
Following are the general properties of plastics.
- Strength. The plastics are sufficiently strong and can be used for load bearing structural members.
- Weather Resistance.
- Fire Resistance.
- Durability.
- Dimensional Stability.
- Chemical Resistance.
- Thermal Resistance.
- Working Conditions.
What is the characteristics or properties of plastic plates?
Plastics generally have: resistance to corrosion and chemicals, low electrical and thermal conductivity, high strength-to-weight ratio, colors available in a wide variety and transparent, resistance to shock, good durability, low cost, are easy to manufacture, resistant to water and have low toxicity.
What are the mechanical properties of plastic?
Plastics with good mechanical properties
- Strength: measure of the resistance of a material to external stress.
- Stiffness: measure of the resistance of a material to deformation.
- Hardness: measure of the resistance of a material to deformation under concentrated compressive load.
- Toughness: measure of the energy absorption capacity of a material during impacts.
What are mechanical properties?
Mechanical properties are physical properties that a material exhibits upon the application of forces. Examples of mechanical properties are the modulus of elasticity, tensile strength, elongation, hardness and fatigue limit.
What are the mechanical properties of matter?
Mechanical properties of matter
- stress, strain, Young modulus.
- force-extension graphs, energy stored.
How is plastic toughness measured?
Toughness of a plastic is measured by its resistance to impacts. It is the ability of a material to resist both fracture and deformation. One common way to discuss the toughness of a polymer is to examine the area underneath the stress – strain curve for the particular polymer.