ISSN:
1573-4803
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Abstract In Parts 1 and 2 of this series the influence of mould geometry and processing parameters was investigated for elongational flow injection moulded polyethylene with the aim of improving the mechanical properties. In the present study (Part 3) injection moulding of commercial polyethylene samples has been carried out using a wide range of molecular weights. Two moulds were used, one of them only providing shear flow, the other one allowing, in addition large elongational flow. In the case of the mould with large elongational flow, at a critical molecular weight, which depends on the melt temperature, a well defined transition in birefringence and mechanical properties of the injection mouldings has been detected. This transition has been discussed in terms of a development of a percolating network structure of long-lived stable knots yielding high mechanical strength oriented mouldings.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01174539
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