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Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on.
What are the 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 are the 5 properties of polymers?
Heat capacity/ Heat conductivity. The extent to which the plastic or polymer acts as an effective insulator against the flow of heat. Thermal expansion. The extent to which the polymer expands or contracts when heated or cooled. Crystallinity. Permeability. Elastic modulus. Tensile strength. Resilience. Refractive index.
What are the physical and chemical properties of polymers?
Melting point, boiling point, strength, hardness, density, color, opaqueness, transparency, and electrical conductivity are among the physical properties they might mention. Chemical reactivity such as combustion and biodegradability are common chemical properties.
How do polymers have different physical properties?
Because of the structure of the molecules, polymeric materials have different properties compared to other materials, like metals. Specifically, the relatively high molecular weight and long polymer chain length result in entanglement, and the lack of covalent intermolecular bonds facilitates polymer chain mobility.
What are three properties of polymers?
A1.1 PHYSICAL PROPERTIES Physical properties of polymers include molecular weight, molar volume, density, degree of polymerization, crystallinity of material, and so on.
What are the 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.
How do you classify 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 is a polymer melt?
Polymer melts are solvent-free, viscoelastic liquids consisting of entangled macromolecules with a monomer volume fraction ηm=πρmb3/6 comparable with that of simple liquids.
What are 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 two types of polymers?
Polymers are of two types: naturally occurring and synthetic or man made.
What are examples of polymers?
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 are the uses of polymers?
Uses of polymers new packaging materials. waterproof coatings for fabrics (eg for outdoor clothing) fillings for teeth. dressings for cuts. hydrogels (eg for soft contact lenses and disposable nappy liners) smart materials (eg shape memory polymers for shrink-wrap packaging).
What affects the properties of polymers?
Polymer properties depend on the chemicals that the polymer is made from and polymerization conditions that ultimately set molecular architecture: chemical linkage type, chain length, and the nature of the end groups. The type of the monomer-repeat unit that forms a polymer has a strong effect on polymer properties.
What are polymers answer?
Polymers are materials made of long, repeating chains of molecules. The materials have unique properties, depending on the type of molecules being bonded and how they are bonded. Some polymers bend and stretch, like rubber and polyester. The term polymer is often used to describe plastics, which are synthetic polymers.
Why do polymers have different physical and chemical properties?
Why do different polymers have different properties? Answer: They have different chemical compositions (different monomer units), different structures, different ways of being fabricated, etc.
How can we change the properties of polymers?
Overall, the main ways to change and tune the properties of a polymer include changing the length of the polymer chains, creating branched chains from linear polymer chains, crosslinking the polymer chains and adding plasticizers into the polymer.
What is cross linking How does it change the property of polymers?
Cross-linking Rubber and some other polymers can be cross-linked. A chemical reaction takes place that connects the chains to each other permanently. This makes the whole structure more rigid and less elastic. It also makes the material a lot stronger and harder.
Why are polymers so strong?
The bigger the molecule, the more molecule there is to exert an intermolecular force. Even when only weak Van der Waals forces are at play, they can be very strong in binding different polymer chains together. This is another reason why polymers can be very strong as materials.
What are artificial polymers?
Synthetic polymers are human-made polymers, often derived from petroleum oil. Some familiar household synthetic polymers include: Nylons in textiles and fabrics, Teflon in non-stick pans, Bakelite for electrical switches, polyvinyl chloride (PVC) in pipes, etc.
Are proteins polymers?
Definition. Proteins are polymers in which the 20 natural amino acids are linked by amide bonds. These nonribosomal peptides and amino acids often play an important role in structural and functional proteins.
What are non polymers?
Non-Polymers So while paper plates, styrofoam cups, plastic bottles, and a block of wood are all examples of polymers, there are some materials which are not polymers. Examples of materials which are not polymers include: Elements. Metals. Ionic compounds, such as salt.
What is the structure of polymers?
A polymer is composed of many simple molecules that are repeating structural units called monomers. A single polymer molecule may consist of hundreds to a million monomers and may have a linear, branched, or network structure.
What are polymers write classification of polymers and their uses?
Commercial Uses of Polymers Polymer Monomer Uses of Polymer Rubber Isoprene (1, 2-methyl 1 – 1, 3-butadiene) Making tyres, elastic materials BUNA – S (a) 1, 3-butadiene (b) Styrene Synthetic rubber BUNA – N (a) 1, 3-butadiene (b) Vinyl Cyanide Synthetic rubber Teflon Tetra Flouro Ethane Non-stick cookware – plastics.
Is glass An example of polymers?
Most glass is made from sand, and when we melt down the sand, we usually add some sodium carbonate. This gives us a tougher glass with a structure that looks like this: These linear, and yes, inorganic materials have a structure very similar to glass, and they’re considered polymers.
