IMPROVEMENTS IN THE TREATMENT OF POLYETHYLENE AND LIKE POLYOLEFINS AND IN PRODUCTS OBTAINED THEREBY
The properties of polyethylene film or film of a similar polyolefin are improved by radioinduced cross-linking. The polymers must have a molecular weight of at least 12000 to be solid at room temperature. The materials, oriented to some extent by uni-axial or bi-sxial stretching during production, are first subjected to high energy ionizing radiation to produce a limited cross- linking. They are then heated and uni- or bi-axially orienited and finally cooled. To promote cross-linking in standard polyethylene it may be mixed with a special polyethylene containing vinyl, vinylene, or vinylidene groups which readily undergo crosslinking. The orientation step following the irradiation may be carried out by stretching or by calendering, but in both oases it is important that the polymer undergoing orientation shall be hot. The irradiation must induce some crosslinking of the polymer and should amount to a dosage of at least 2 Mrep. The improved properties are compared and the equipment used is discussed. (N.W.R.)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-15-018398
- OSTI ID:
- 4015500
- Report Number(s):
- GB 866820
- Country of Publication:
- United Kingdom
- Language:
- English
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