超音波による高分子解重合の理論

概要

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It is well-known that the irradiation of intensive ultrasonics into polymer solution causes cavitation and decreases the degree of polymerization. The mechanism of the ultrasonic degradation can be explained as follows. In the contracting stage of a cavitating bubble, j structual units of a polymer molecule take a straight line-configuration by the suction force of the bubble. Slipping occurs between solvent molecules and the polymer. The latter undergoes tensile force arising from friction between them, which is greatest at the middle carbon bond of the j units. If it is greater than a critical value, the bond is unable to absorb the work done by it, but the bond is torn off; i. e. , the polymer degrades. Under such considerations many experimental facts about ultrasonic degradation can be explained, and also a formula for final degree of polymerization after long-time irradiation is given here.
社団法人日本音響学会の論文
1960-03-30