木材へのメタクリル酸メチルの無触媒グラフト重合(<特集>木質材料)
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As one of the methods for chemical modification of wood, the graft polymerization of MMA to wood was carried out in aqueous suspension in the absence of radical initiators. The wood samples used in the experiment were the hot water extracted and the alcohol-benzene extracted birch wood powder (40-60 mesh). The polymerization was made within glass tubes sealed in vacuum, at 85℃ for definite times. The results of the experiment are as follows. (1) The yield of total polymer in the presence of wood takes lower value than the yield of thermal polymerization (That is, the conversion in the absence of wood). It is found that the wood extractives supplied from the wood during the polymerization play an important part in retardation of the polymerization of MMA. Furthermore, in this polymerization system, the wood extractives have no effect on graft polymerization, but they retard homopolymer formation, so that, the more wood extractives there exist, the higher the grafting efficiency is. (2) The graft yield increases linearly with the polymerization time after some induction period, but there is no variation of grafting efficiency with the polymerization time in each definite polymerization condition. (3) When the amount of wood and MMA is fixed and that of the water is variable, the graft yield takes the maximum value with certain amount of water, beyond which the grafting efficiency decreases simultaneously. It can be argued from this that in the condition where the small amount of water exists, the polymerization of MMA occurs predominatingly within the cell wall of the wood, and that in the case where the water exists richly, the polymerization occurs substantially outside the cell-wall of the wood. (4) When both the amount of wood and water is fixed and that of MMA is variable, such a phenomenon as is described in (3) occurs as to the amount of MMA.
- 社団法人日本材料学会の論文
- 1969-10-15
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