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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

One of the most important enzymes in the world鈥� nitrogenase, the plant protein that catalyzes nitrogen fixation鈥� contains active clusters of iron, sulfur, and molybdenum atoms. Crystalline molybdenum (Mo) has a body-centered cubic unit cell (d of Mo is 10.28g/cm3).

(a) Determine the edge length of the unit cell.

(b) Calculate the atomic radius of Mo.

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?

A liquid is in equilibrium with its vapour in a closed vessel at a fixed temperature. The vessel is connected by a stopcock to an evacuated vessel. When the stopcock is opened, will the final pressure of the vapour be different from the initial value if

(a) Some liquid remains

(b) All the liquid is first removed?

Which member in each pair of liquids has the lower vapour pressure at a given temperature? Explain.

(a) HOCH2CH2OHorCH3CH2CH2OH

(b) CH3COOHorCH32C=O

(c) HF or HCl

(a) Why are gases more easily compressed than liquids?

(b) Why do liquids have a greater ability to flow than solids?
See all solutions

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