コロナ ホウデン マエ ショリ ニ ヨッテ サクセイシタ スチレン ＷＰＣ ノ スンポウ アンテイ セイ
Dimensional Stability of Styrene-WPC Made from Corona-pretreated Wood
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By utilizing corona-pretreatment, wood-polymer composite (WPC) was made with styrene monomer and hinoki (Chamaecyparis obtusa End1.), and its dimensional stability was investigated.
The wall polymer produced was 7% at a maximum, showing a very low value compared with that of MMA (methyl methacrylate)-WPC made by both corona discharge and heat-catalyzed method which were reported previously.The ASE（antiswelling efficiency) of styrene-WPC under moisture absorption showed roughly 20-38% except for the WPC made at a monomer concentration of 1OO%, and it was not much different from the case of MMA-WPC. The ASE and MEE (moisture-excluding efficiency）were directly proportional to the wall polymer content. So it is clear that in styrene-WPC the dimensional stability was greatly improved by the presence of a small amount of wall polymer. But the wall polymer did not have much effect on the ASE under water absorptionand the WEE (water-excluding efficiency).
Less polymer produced by corona discharge in styrene-WPC seems to be due to styrene being harder to polymerize radically compared with MMA so that little polymer was observed in the cell lumina of styrene-WPC. The presence of a little wall polymer is assumed to be restricted to only the vicinity of the intercellular layer. For improving more greatly the dimensional stability of styrene-WPC against moisture absorption as well as water absorption, treatment to make polymer exist in the whole cell walls including the secondary wall would be required.
Bulletin of the Faculty of Agriculture, Shimane University
Shimane University, Faculty of Agriculture
Departmental Bulletin Paper
Faculty of Life and Environmental Science