- 作者: 陳秩宗; 林碧洲; 黃允光; 蕭全諒
- 作者服務機構: Contribution from Department of Chemical Engineering, National Taiwan University
- 中文摘要:
The kinetic studies of polymerization of methyl methacrylate initiated with nickel ethyl acetoacetate gave the following equations.
Rp=K1[Monomer]1.1[Chelate]0.5, in the absence of aniline
Rp-K2[Monomer]1.2[chelate]0.5[Aniline]0.5, in the presence of aniline.
Some aromatic amines such as aniline markedly accelerated the polymerization, while pyridine had no such effect. The activation energy of initiation was 24.8 kcal/mol in the absence of aniline, and 8.8 kcal/mol in the presence of aniline. Both the kinetic data and the infrared spectra of the polymer indicated that the polymerization was radical in nature. The reaction order against monomer varied, as the temperature differed. The spectrophotometric investigation indicated formation of a complex between the chelate and the monomer, or amines. It also showed that the formation of a complex was not a factor which controlled the rate of initiation. A scheme of initiation mechanism was presented on the basis of the above experimental evidence. - 英文摘要: --
- 中文關鍵字: --
- 英文關鍵字: --