著者

井町 正樹

出版者

一般社団法人 溶接学会

雑誌

溶接学会誌 (ISSN:00214787)

巻号頁・発行日

vol.43, no.2, pp.127-134, 1974-02-25 (Released:2011-08-05)

参考文献数

14

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One of the principal problems in using polyethylene is the poor adhesion because of its nonpolarity and high crystallinity. There are various methods for surface treatment to improve adhesiveness of polyethylene and many ofthem are applied on purpose to make polyethylene oxydized and polarized.Relation between treatment conditions and adhesiveness or the effect of oxydation are not sufficiently clear. In this study, low density polyethylene film was exposed to pure oxygen gas under a pressure of 20kg/cm2-80kg/cm2 at 80°C-110°C for 5hours-30hours, and then degree of oxydation, wettability, adhesiveness and others were investigated. The effect of chromic acid treatment which is popularly used on account of its convenience was also examined.The results are summarized as follows:(1) Oxygen gas treatment even at a temperature below the melting point of polyethylene is somewhat effective on wettability and adhesiveness and more effective at a temperature above the melting point.(2) The adhesive strength of polyethylene increases owing to oxygen gas treatment but shows a decreasing tendency in excessive oxydation. One of the factors which cause this fact seems to be the weak boundary layer fomed with the advance of oxydation.(3) It becomes clear that the effect of only oxydation on adhesiveness is not so remarkable, i.e. polyethylene surface subjected to oxygen gas treatment dose not exhibit more increase in adhesive strength than that treated with chromic acid which is considered to be attended with some factors such as surface roughness in addition to oxydation.