微孔塑料物理发泡新技术

微孔塑料因其独特的结构性能和工艺合于环保要求而成为研究热点忧核过程和泡孔长大的控制是微孔发泡中的研究重点。文章阐述了泡核形成的均相成核，固液界面诱导的非均相成核以及空穴成核的机理和模型。在成核过程中，泡核的临界半径和成核速率占用 位，提高体系的过饱和度和压力降有利于泡核临界半径的减小和成核速率的提高。

NEW TECHNOLOGY OF MICROCELLULAR FOAMING PLASTICS

The microcellular foaming plastics has become a hot study region because of its unique properties and constructure and the process be of environment protection. Nucleation and the bubble growth controlling be of key importance in the foaming processing, in this paper, the nucleation mechanism and nucleation model(including homogeneous nucleation, solid liquid and microcavities induced heterogeneous nucleation) is presented. In the processing, the nucleation rate and cells density increasing, and the cells critical radius and the bubble size decreasing when promotion the gas/polymer pressure and the gas concentration. Microcavities inducing nucleation is presented in this paper. Futhermore, a new competition conception between nucleation and cell growth can be used to explain the final microcellular constructure, and we confirmed this conception by experiment. Sea island and cells models are used to illustrate the bubble growth commonly, after summarizing and analysis, one think the cells model is reasonable to govern the buble growth.