An Introduction to Polymer Chemistry - download pdf or read online

By D East, G C Margerison

ISBN-10: 0080118917

ISBN-13: 9780080118918

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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. By definition, a weight M of the substance contains N0 molecules and hence the weight of each molecule m is given by M No Given that M = 100 g m o l e - 1 , we write 1 0 0 1 -1 m = -^-r- g mole ± Ν0 _ 100 g mole-1 23 " 6 - 0 2 3 XlO mole-1 -22 = l-66XlO g. 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.

In a particularly simple case, the decomposition of HI in the gas phase to H 2 +I 2 , the experimental rate expression is -4HI] = &[HI]2 dt Ul furti so that we need look no further for the mechanism than the single step HI + H I - H 2 + I2 In the case of polymerization, a moment's reflection will make it quite clear that there is no possibility of its being so simple— the fact of our having a large number of monomer molecules reacting together to give a single polymer molecule automatically means that we must have a large number of elementary reactions involved.

Polystyrene, for example, with the repeating unit CH 2 CH I QH5 is miscible in all proportions with ethyl benzene CH 3 CH 2 I In general the process of solution is quite slow, two distinct stages being observable—a polymer absorbs the solvent to give a gel which then slowly disperses to give a solution. With some liquids the process stops at the swelling stage, the polymer never going completely into solution. With other liquids, there is not even this partial solubility—these liquids are termed non-solvents and are often used to precipitate the polymer from solution.

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


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