Mark‐Houwink relations for linear polyethylene in 1‐chloronaphthalene and 1,2,4‐trichlorobenzene

Wiley - Tập 11 Số 6 - Trang 1189-1200 - 1973
Herman L. Wagner1, C. A. J. Hoeve1
1 Institute for Materials Research, National Bureau of Standards, Washington, D. C. 20234

Tóm tắt

Abstract

The parameters in the Mark‐Houwink relationship, [η] = K′M̄va, for linear polyethylene in 1‐chloronaphthalene and 1,2,4‐trichlorobenzene at 130°C have been estimated. They were found by measuring the limiting viscosity numbers of a series of fractions with molecular weights ranging from less than 10,000 to almost 700,000. The results are for 1‐chloronaphthalene, [η] =0.0555 M̄v0.684 (with a standard error of 0.0064 in K′ and 0.010 in a) and for 1,2,4‐trichlorobenzene, [η] = 0.0392M̄v0.725 (with a standard error of 0.00703 in K′ and 0.015 in a), where [η] is expressed in ml/g. The unperturbed end‐to‐end distance calculated from the viscosity‐molecular weight data agrees with the theoretically expected value.

Từ khóa


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Wiley

Tập 11 Số 6

1189-1200

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