| 초록 |
The effects of acetic acid on the polymerization characteristics of nylon-6 were investigated in reactor models that consist of a continuous flow stirred tank reactor and a tubular reactor with diffusional water removal system, which are connected in series. Mathematical models for continuous flow stirred tank reactor(CSTR) and tubular reactor have been established and solved by numerical methods. In CSTR, as the feed acetic acid content is increased, the monomer conversion and the molecular weights are increased. In tubular reactor, the acid behaves both as a catalyst and as a modifier for the polymerization reaction. The effects of feed acetic acid content and diffusional water removal on the zeroth, first, second moments and polydispersity of the polymer have been investigated. The polydispersity index is greatly affected by the feed acetic acid content in CSTR, but it finally approaches to the values of ∼2 in tubular reactor. The diffusional water removal has no effect on the polydispersity index ofthe polymer.
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