ボールミル粉砕によるポリビニルピロリドンの分子量低下に対するふん囲気の影響

概要

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The rate of decrease of mean molecular weight and the change in molecular weight distribution of PVP by ball-milling in an atmosphere of nitrogen, air or oxygen were investigated. The influence of an atmosphere on the probability of the degradation of a PVP molecule in a unit time and molecular size distribution of the polymers formed by the degradation was then discussed. If the function representing the probability a PVP molecule to be cut off in a unit time, S(M), was proportional to (M-M_∞)^α, α was considered to be between 1.0 and 1.5, and to be 1.0 for the case of ball-milling in nitrogen or air and to be larger than 1.0 for the case of ball-milling in oxygen. It is considered to be probable that a PVP molecule with molecular weight of 1.6×10^6 is broken both at the center and at the molecular weight between 6.0×10^3 and 1.1×10^4 from the end of a main chain by ball-milling in nitrogen, and at the molecular weight of 3.6×10^4 from the end by ball-milling in air or oxygen. It seems to be possible that the PVP molecule is broken at the molecular weight between 5.0×10^4 and 3.7×10^5 from the end by ball-milling in oxygen.
社団法人日本材料学会の論文
1972-06-15