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Chapter 12: Q12.110P (page 497)

Use an example to show how branching and crosslinking can affect the physical behaviour of a polymer.

Short Answer

Expert verified

A polymer is a macromolecule composed of many repeating monomer subunits.

Step by step solution

01

Definition

A branched polymer is a macromolecule having a side chain or branches that are attached to the main polymer.

A cross-linked Polymer is a three-dimensional structure formed when monomer units are cross-linked together.

Due to branches, it reduces the crystallinity of the polymer by decreasing the ability of close packing of the chains and has a low density and tensile strength. A common example is low-density polyethylene that is (LDPE). It is used in plastic bags, textiles, and containers, as coatings for various packaging materials.

02

Cross-linked polymer

Cross-linked polymer gives a material a better-defined shape, and rigidity and making it brittle through chemical linkages. The vulcanization of rubber, Bakelite, melamine-formaldehyde, etc, are examples.

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Most popular questions from this chapter

Why are covalent bonds typically much stronger than intermolecular forces?

Why does an aqueous solution of ethanol ( CH3CH2OH) have a lower surface tension than water?

Why does the antifreeze ingredient ethylene glycol ( HOCH2CH2OH) have a boiling point of 197.6掳C, whereas propanol (CH3CH2CH2OH ), a compound with a similar molar mass, has a boiling point of only 97.4掳C?

What is the number of atoms per unit cell for each metal?

(a) Polonium, Po (b) Manganese, Mn (c) Silver, Ag

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(c) Vapor pressure

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