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

Semi micro analysis, on what basis basic radicals are separated into six gr...

on what basis basic radicals are separated into six groups ?

Would formic acid useful basis for buffer solution, Formic acid is a weak a...

Formic acid is a weak acid along with a pKa of 3.75. Name of this comes through the Latin term "formica" ("ant") since it is extremely plentiful into the secretions of several spec

Why bromoethane are insoluble, Why bromoethane are insoluble Because on...

Why bromoethane are insoluble Because only two layers form, two of the three substances are mutually soluble. we know that water and bromoethane are insoluble-they form two lay

Chemical equation, why is it useful to use moles to measure chemical quanti...

why is it useful to use moles to measure chemical quantities

Removal of nitrogen in waste water, Question 1: a. Describe in details ...

Question 1: a. Describe in details the composting process. b. Odour is very often a big problem in composting facilities.  Describe some odour avoidance and odour treatment

In the transition of zn atoms, In the transition of Zn  atoms to Zn ++ ion...

In the transition of Zn  atoms to Zn ++ ions there is a decrease in the: (1) Number of valency electrons (2) Atomic weight (3) Atomic number (4) Equivalent weight A

Phy chem, describe the various types of velocities?

describe the various types of velocities?

Illustrate relative amount of two co-existing phases, Illustrate and demons...

Illustrate and demonstrate that, for correct mass balance, relative amount of two co-existing phases or micro constituents should be as given by lever rule. The lever rule giv

Methods of extraction., defind:smulting, rosting,physical and chemical meth...

defind:smulting, rosting,physical and chemical method

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