Important synthetic rubbers: polyethylene, Chemistry

Assignment Help:

Polyethylene: Polyethylene are formed by polymerization of ethylene under high pressure and at moderately high temperature. The resulting polymers are then subjected to substitution and other reactions to yield the required plastic. Polyethylene's have good chemical resistance electrical resistance low water absorption and good flexibility. These are much cheaper than other plastics. However high temperature and sunlight affects the properties of polyethylene's adversely e.g. resistance to chemicals falls drastically at higher temperature.

USES:

(1)                         Used in manufacture of toys and other house hold articles.

(2)                         Used for the manufacturer of domestic pipes and gas pippins.

PROPERTIES:

(1)                         Due to strong inter: chain forces tensile strength is quite high.

(2)                          It can be vulcanized to a little extent to form cross linked structures with improved mechanical properties due to the little presence of double bonds. Thus this rubber cannot be hardened due to small number of cross linkages.

(3)                         It is highly resistant to atmosphere heat abrasion acids oils alkalis oxygen and ozone.

USES:

(1)                         Used as an insulation material in the electrical industry and in rubber based industries like inner tubes for the tyres of bicycles rickshaws and automobiles.

(2)                         Used as a solid fuel for rockets.


Related Discussions:- Important synthetic rubbers: polyethylene

Rusting of iron, How rusting of iron is envisaged as setting up of an elect...

How rusting of iron is envisaged as setting up of an electrochemical cell? Solution) Rusting of Iron is due to corossion. Rust is an Fe 2 O 3 .xH 2 O Theory of Rusting :

What is the mass of the tube, A covered glass tube contains 2.25g of copper...

A covered glass tube contains 2.25g of copper and 3.32g of sulphur. The mass of the tube as well as its contents is 18.48 g. Upon heating a chemical reaction forms copper(II) sulph

Illustrate resonance structures, Illustrate resonance structures that defin...

Illustrate resonance structures that define the electronic structure of benzene. Illustrate the structures of all conceivable disubstituted benzene isomers bearing two

Illustrate saturated and unsaturated hydrocarbons, Q. Illustrate Saturated ...

Q. Illustrate Saturated and Unsaturated Hydrocarbons? Ans. The term hydrocarbon is similar to the term organic. The term hydrocarbon emphasizes the fact that these compou

Thermal reactions , Indicate whether the following thermal reactions are al...

Indicate whether the following thermal reactions are allowed concerted reactions by the Woodward-Hoffmann criteria. Classify the reaction according to type. On the basis of

Nomenclature of bicyclic compounds, Nomenclature of Bicyclic compounds ...

Nomenclature of Bicyclic compounds Several hydrocarbons and their derivatives include two fused or bridged rings. The carbon atoms are common to both rings are known as bridge

Conversion of caco3 equivalent, Q.   A sample of water analysis was found t...

Q.   A sample of water analysis was found to contain temporary magnesium hardness 25 mg/L. Permanent magnesium chloride hardness 15 mg/L and permanent calcium sulphate hardness 20

Organic chemistry, why is soda lime used instead of plain NaOH in preparati...

why is soda lime used instead of plain NaOH in preparation of methane?( for class 10)

The following hydrides are ionic, Which of the following hydrides are ionic...

Which of the following hydrides are ionic: (1) CaH 2                                              (2) BaH 2                     (3)  SrH 2               (4) BeH 2

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd