The preparation and properties of fractions from high density polyethylenes

Wiley - Tập 14 Số 3 - Trang 131-140 - 1964
G. R. Williamson1, Bryon E. Wright1, R. N. Haward1
1Shell Chemical Company Ltd., Carrington Works, Urmston, Manchester

Tóm tắt

AbstractA number of fractions have been prepared on a large scale from Ziegler 0·945‐density polyethylene and Phillips 0·96‐density polyethylene. Their physical properties have been compared with those of whole polymers having much broader distributions of molecular weight. It is shown that the main effects of narrowing the molecular‐weight distribution of polyethylene are to lower its density, to reduce its tensile yield strength, probably to increase its impact strength, and (with some reservations) to increase its ultimate elongation. Little change is evident in melt index or folding endurance. The effects on stress‐cracking resistance depend upon the type of polymer being considered. The relationship between yield strength and density is independent of intrinsic viscosity and of intrinsic viscosity distribution.

Từ khóa


Tài liệu tham khảo

10.1002/bscb.19500590707

10.1002/pol.1959.1203613002

10.1139/v61-253

10.1002/macp.1956.020200109

10.1002/pol.1957.1202410702

10.1002/pol.1958.1203112323

Duch E., 1956, Z. Elektrochem., 60, 218

10.1002/jctb.5010140201

10.1002/jctb.5010010812

British Standard Specification 2782

Tung L. H., 1958, SPE J., 14, 25

A.S.T.M.D1693‐60T.

Thông tin
Thông tin xuất bản

Wiley

Tập 14 Số 3

131-140

Thông tin tác giả