Which polymer is used for making combs?

Bakelite is used for making combs, phonograph j records, electrical switches and handles of cooking utensils.

What is an example of a network polymer?

An example of a network polymer formed by weak connections is the gel formed by pectin. This natural network polymer is the basis for jellies and jams. The properties of network polymers depend on the density of the network.

What is a polymer give four 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 example of homopolymer?

A homopolymer plastic is one that is produced by the polymerization of a single monomer. For example, polystyrene is composed of nothing but styrene monomer residues, making it a homopolymer. Other examples of homopolymer thermoplastics that are used in injection molding include: Polypropylene.

What is the monomer used to making comb?

Chain Polymerization of Vinyl Monomers A hydroxyl functional comb polymer is made by the synthesis of block macromonomers by CCTP, which contain hydroxyl functionality and copolymerizing these with acrylic monomers to form a comb polymer.

How are star polymers formed?

In general, star polymers are grown by one of three different strategies: the ‘core-first’ approach, where the arms of the star are grown from a multifunctional initiator; the ‘arm-first’ technique, which involves the coupling of preformed macroinitiators or macromonomers with a cross-linking agent to form the core of …

Which polymer is space network polymer?

polystyrene. polystyrene, a hard, stiff, brilliantly transparent synthetic resin produced by the polymerization of styrene.

Which is a network polymer?

Network polymers are highly crosslinked materials in which some of the atom valencies are satisfied by bonds that result in a three-dimensional (3D) structure.

What are branched polymers?

Branched polymers are defined as having secondary polymer chains linked to a primary backbone, resulting in a variety of polymer architectures such as star, H-shaped, pom-pom, and comb-shaped polymers.

What are the 4 types of polymers?

Synthetic polymers are human-made polymers. They can be classified into four main categories: thermoplastics, thermosets, elastomers, and synthetic fibers.

What are polymers 12?

A polymer is a large molecule of high molecular mass formed by the repetitive bonding of many small molecules called monomers. The process by which the monomers are transformed into polymers is called polymerisation. As polymers are single big size molecules, they are also called macromolecules. 2.

How is polymer flow classified?

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 difference between homopolymer and copolymer?

The main difference between homopolymer and copolymer is that homopolymers are produced by using a single type of monomer, whereas copolymers are formed by using two different types of monomers.

Is insulin a homopolymer?

Insulin is a naturally occurring homopolymer of fructose which consists of 3-60 monomers.

How many polymers is a homopolymer?

6 Number of different monomers in a polymer. A homopolymer will have the characteristics of its monomer type – ethylene to polyethylene, propylene to polypropylene, for example.

Is nylon 66 a condensation polymer?

Nylon-66 is a polyamide fibre which is manufactured by a process that involves step growth polymerization and condensation polymerization. The generic term used to define long chain synthetic polyamides is Nylon.

How is nylon 66 prepared?

Nylon 66 is synthesized by polycondensation of hexamethylenediamine and adipic acid. Equivalent amounts of hexamethylenediamine and adipic acid are combined with water in a reactor. This is crystallized to make nylon salt, an ammonium/carboxylate mixture. … Thus molten nylon 66 is formed.

Is Buna N addition polymer?

Copolymer is the polymer which is formed by addition polymerization of two different monomers, such as Buna-N, Buna-S etc. … The monomers of Buna-N are 1,3-butadiene and acrylonitrile. So, Buna-N is a copolymer. Nylon-66 is a condensation polymer.

What are linear polymers?

A linear polymer is simply a chain in which all of the carbon-carbon bonds exist in a single straight line. An example of a linear polymer is Teflon, which is made from tetrafluoroethylene. It is a single strand of units made from two carbon atoms and four fluorine atoms.

What are the two categories of polymers?

Polymers fall into two categories:

• thermosetting plastic or thermoset.
• thermoforming plastic or thermoplastic.

What are dendrimers made of?

Dendrimers are constructed by the successive addition of layers to the branching groups. The synthesis of dendrimers involves a core molecule with branching groups to which other branching molecules are added (see figure below) in layers. Each new layer is called a generation.

What is the name of Ziegler Natta catalyst?

A Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, is a catalyst used in the synthesis of polymers of 1-alkenes (alpha-olefins).

Is PVC network polymer?

PVC is a thermoplastic polymer. Its properties are usually categorized based on rigid and flexible PVCs.

What is Polythene made of?

Polyethylene plastic: a Carbon-Hydrogen molecule. Polyethylene is made up of ethylene molecules with 2 carbon and 4 hydrogen atoms.

Is melamine a network polymer?

Examples are bakelite and melamine. They contain strong covalent bonds in their polymer chains. Cross linked of network polymers are usually formed from bi-functional and tri-functional monomers and contain strong covlent bonds between various linear polymer chains. Typical examples are bakelite, melamine.

What is polymer and types of polymer?

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 epoxy a network polymer?

Epoxy resins are polymeric or semi-polymeric materials or an oligomer, and as such rarely exist as pure substances, since variable chain length results from the polymerisation reaction used to produce them. High purity grades can be produced for certain applications, e.g. using a distillation purification process.

What are linear and branched polymers?

Linear polymers are macromolecules containing a large number of repeating units or monomers that attach to each other forming a straight linear structure while branched polymers are macromolecules containing a large number of repeating units arranged in a branched structure.

What are examples of condensation polymers?

Examples of natural condensation polymers include cellulose, starch, and polypeptide chains of proteins. Several synthetic condensation polymers discussed include nylon, kevlar, polyester, Bakelite, Melamine, polycarbonates, polyurethanes, epoxies.

What are cross links in polymers?

In chemistry and biology a cross-link is a bond or a short sequence of bonds that links one polymer chain to another. These links may take the form of covalent bonds or ionic bonds and the polymers can be either synthetic polymers or natural polymers (such as proteins).