JOURNAL OF THE JAPAN WELDING SOCIETY
Online ISSN : 1883-7204
Print ISSN : 0021-4787
ISSN-L : 0021-4787
On the Wetting and Adhesion of Molten Polyethylene (Report 2)
Masaki Imachi
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1979 Volume 48 Issue 10 Pages 845-850

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Abstract

In the previous paper, the keinetics of wetting and adhesion of various adherends by molton polyethylene in argon gas were investigated. In this paper, the keinetics of wetting and adhesion of glass plate by molten polyethylene containing 0.5 mm length glass fibers were investigated. Relation among wettability, adhesiveness and surface tension γL and viscosity η of this composite polyethylene was also studied.
The results are summarized as follows:
(1) It was experimentally confirmed that the time constant τ of cos θ-t curve obtained on plain polyethylene or the polyethylene which contains glass fibers is in proportion to η/γL, where θ is contact angle, and τ is mainly affected by the change η than that in γL, when the temperature changes.
(2) According as polyethylene contains more glass fibers, τ and η increase and the rate of the increase of τ is far greater than that of η.
(3) Because of the existence of glass fibers in polyethylene, wettability is reduced but the adhesive strength considerably increases and this is due to the fact that the cohesive failure occurs in the polyethylene layer and the polyethylene is reinforced by glass fibers.

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