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Polymers: Asset to human race
5 students

Polymers: Asset to human race

Polyester
Created byVinay Arya
Last updated 5/2022
English

What you'll learn

  • The students will get a wide picture of Polymers.
  • The students will learn about the Polymers found naturally in environment.
  • The students will have a deep knowledge about the extraction and preparation of Polymers.
  • The students will know about the importance of natural and synthetic polymers.

Course content

1 section • 10 lectures • 1h 49m total length

  • 15.1. Contents of Polymers11:02

    Explore the contents and sequence of polymer topics, from polymerization and monomers to origin and structure, plus molecular forces, with examples like nylon, teflon, and biodegradable polymers.

  • 15.2. Introduction of Polymers11:33

    Explore the fundamentals of polymers, including monomers, polymerization, and repetitive units, and learn how homo polymers and copolymers form long chains of high molecular mass.

  • 15.3. Classification of Polymers on the Basis of Origin10:09

    Classify polymers by origin—natural, synthetic, and semi-synthetic—listing examples like rubber, cellulose, starch, nylon, and polyethylene, and introduce structure types: linear, branching, and cross-linked polymers.

  • 15.4. Cross-linked polymers9:47

    Explains cross-linked polymers form a three-dimensional network due to cross links, making them hard and inflexible, and classifies them by intermolecular forces into elastomers, fibrous polymers, thermoplastics, and thermosetting polymers.

  • 15.5. Thermosetting polymers8:20

    Thermosetting polymers form a three-dimensional cross-linked network when heated, becoming insoluble and permanently hard, so they cannot be remolded after curing. Formaldehyde resin and melamine exemplify these polymers.

  • 15.6. Chain Growth Polymerization11:38

    Explore chain growth polymerization, detailing initiation, propagation, and termination, and compare with step-growth mechanisms while examining free radical, cationic, anionic polymerization and initiators like benzoyl peroxide.

  • 15.7. Copolymerization14:52

    Understand copolymerization, the formation of copolymers from multiple monomers via chain growth or step growth polymerization, with examples like butadiene-styrene and polyethylene varieties.

  • 15.8. Preparation of Condensation Polymers14:12

    Learn how condensation polymers form by releasing water in ester and amide linkages. Explore examples like polyester fibers (Dacron), nylon 6-6 and nylon 6, Bakelite, and melamine-formaldehyde resins, plus applications.

  • 15.9. Melamine Formaldehyde Resin7:43

    Explore melamine formaldehyde resin, a hard amino resin formed by condensation of melamine with formaldehyde at 80 degrees Celsius. This resin yields durable plastic crockery under the trade name melmac.

  • 15.10. Polymers as Pollutants10:35

    explains how polymers can pollute the environment, why synthetic polymers are largely non-biodegradable, and how certain biodegradable polymers such as polyhydroxybutyrate and polylactic acid degrade by microorganisms.

Requirements

  • The child should have a clear concepts of natural products.

Description

Natural polymers: The polymers which occur in nature i.e., which occur

either in plants or animals, are called natural polymers. For example,

natural rubber, proteins, cellulose, starch (polysaccharides), wood, silk and

nucleic acids are natural polymers.

Synthetic polymers: Synthetic polymers are man-made polymers. These

polymers are made in laboratories or factories. Typical examples of

synthetic polymers include polyethene, PVC, nylon, terylene, Teflon,

synthetic rubber, Bakelite and melamine.

Semi-synthetic polymers: Chemically modified natural polymers are

called semi-synthetic polymers. For example, nitrocellulose, cellulose

acetate etc. are termed semi-synthetic polymers. These polymers are also

called chemically modified natural polymers.

Linear chain polymers: The polymers m which the constituent monomers

link with each other to form a long straight chain are called linear chain

polymers, or straight chain polymers.

Linear polymers are well packed and thus have high densities, high tensile

strength and high melting points. For example, high-density polythene

(HDPE) is a linear chain polymer.

Branched chain polymers: The Polymers which have side-chains

attached to the linear chains consisting of monomers are called branched

chain polymers.

The branched chain polymers are irregularly packed and thus have lower

tensile strength, lower melting point and lower density. For example,

low-density polythene (LDPE) has lower density, lower melting point and

lower tensile strength than the linear high-density polythene (HDPE).

Who this course is for:

  • For the Beginners and students of twelfth standard.

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