Download PDF by R. Koningsveld (auth.): Fortschritte der Hochpolymeren-Forschung

By R. Koningsveld (auth.)

ISBN-10: 354004762X

ISBN-13: 9783540047629

ISBN-10: 3540361766

ISBN-13: 9783540361763

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The latter is obtained b y summing all functions representing the fractions. Thus, unlike SCHULZ'S method this procedure directly yields the differential weight distribution of the whole polymer, and there is no need for differentiation. The integral curve can be found b y integration. This method, referred to as the generalized BEALL method (12, 13) and SCHULZ'S procedure can both be applied to the calculated fractionation data described in the following. Z and generalized BEALL evaluations can be compared with the true initial distribution.

2. Evaluation Procedures Whatever the scheme chosen the fractionation ultimately yields a number of fractions which, it is certain, cover a range of molecular weights. The analytical problem now arising is how to reconstruct the original distribution from the weights and average molecular weights of the fractions. Owing to the spread of the chain lengths, the molecular weight ranges of the individual fractions must be expected to overlap each other. The impossibility to establish the degree of overlapping adds to the uncertainty existing about the distribution of the fraction weight around the average molecular weight.

Experimental b (x) curves for a mixture of two narrow-distribution poly styrene samples. 6 0B Fig. 17. '(x) data for three samples of polyethylene (characteristics shown in Table 2). Initial concentration: 1% by weight, solvent: diphenylether. L 30-1)-7: ~ o ~ , L 30-5-1: . . • ; L 30-7-6: - - . - - Z x - . - 28 R . 3. : KONINGSVELD Concentration-Dependent Interaction Parameter and Large Solvent Molecules So far, we have based all our considerations on Eq. (1) in which the interaction parameter g is assumed to be independent of the polymer concentration ~.

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Fortschritte der Hochpolymeren-Forschung by R. Koningsveld (auth.)

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