Most Popular Books


Download PDF by D East, G C Margerison: An Introduction to Polymer Chemistry

By D East, G C Margerison

ISBN-10: 0080118917

ISBN-13: 9780080118918

Show description

Read or Download An Introduction to Polymer Chemistry PDF

Best introduction books

A Practical Guide to Swing Trading - download pdf or read online

This is Your likelihood To Get the single functional instruction manual For starting And skilled Swing investors ,That offers Them the total easy approach to begin Being A revenue Taker In Any marketplace . .. "A sensible advisor to Swing Trading", that may exhibit you the most secure solution to constant, convinced profit-taking in any inventory industry.

Download e-book for kindle: Constrained Extrema Introduction to the Differentiable Case by Mohamed A. El-Hodiri (auth.)

Those notes are the results of an interrupted series of seminars on optimiza­ tion idea with fiscal functions beginning in 1964-1965. this is often pointed out in terms of explaining the asymmetric type that pervades them. in recent times i've been utilizing the notes for a semester direction at the topic for graduate scholars in economics.

Additional info for An Introduction to Polymer Chemistry

Example text

CHAPTER 2] D E T E R M I N A T I O N OF MOLECULAR WEIGHT THE determination of the molecular weights of polymeric materials presents, in general, two problems not normally encountered with low molecular weight substances. The first problem arises because polymer samples usually contain molecules with a range of molecular weights. The second problem is encountered whenever the physical properties of polymer solutions are studied—the concentration dependence of these properties is usually so much more pronounced than in the case where low molecular weight solutes are used that the well-established methods for molecular weight determination cannot be employed without considerable modification.

Consequently, in order to evaluate this latter quantity, it is only necessary to count the total number of molecules in a known weight of polymer whence the number average molecular weight follows by simple proportion. Thus, if we were to find that 6-023 X1018 molecules were present in 1 g of polymer, the Avogadro number of molecules would be present in 100,000 g of polymer and hence, as we have explained, the number average molecular weight is 100,000. End-group analysis This method of counting the number of polymer molecules present in a known weight of polymer is available when the polymer molecules possess a known number of detectable end groups per molecule.

For example, we write the Avogadro number as 6Ό23Χ10 23 m o l e - 1 and the root mean square end-to-end distance of a particular polymer molecule as 1000 Â rather than 6-023 x 1023 molecule mole - 1 and 1000 Â molecule - 1 . To achieve complete consistency, we write all molecular weights which appear in equations with the units g m o l e - 1 . One final example will suffice; suppose we wish to calculate the weight of a molecule of a particular substance given its molecular weight M and the Avogadro number N0.

Download PDF sample

An Introduction to Polymer Chemistry by D East, G C Margerison

by Mark

Rated 4.84 of 5 – based on 5 votes

Comments are closed.