以超临界二氧化碳为发泡剂,采用快速降压法,研究了聚苯乙烯（PS）一维和二维受限发泡的微孔形态。考察了不同温度（50℃～110℃范围）、压力（9MPa～18MPa范围）和降压速率（0.38MPa/s～48.1MPa/s范围）对PS受限发泡微孔形态的影响。结果表明,在一维发泡中,随发泡空间的增加,PS微孔取向明显;在二维发泡中,采用气孔板的受限方式,对饱和时间影响小,在相对高温、低压和低降压速率下,二维发泡能够得到更均匀和微小的泡孔材料。
A one-step foaming process（rapid depressurization method） was applied to the one-dimension and two-dimensions constrained foaming of polystyrene（PS） using supercritical carbon dioxide as blowing agent.The effect of temperature（in the range of 50 ℃～100 ℃）,pressure（in the range of 9 MPa～18 MPa） and depressurization rate（in the range of 0.38 MPa/s～48.1 MPa/s） on the final microcellular structure has been investigated.The results show that in one-dimension foaming condition,the degree of cell orientation becomes more obvious with increasing the foaming space.Besides,when blow-hole plate is used as barrier constraints,the saturation time does not increase significantly,however,the cell growth will be restrained dramatically under the relative high temperature,low pressure and depressurization rate conditions,and uniform cell size distribution is achieved.
参考文献
| [1] | Guo QP;Wang J;Park CB;Ohshima M .A microcellular foaming simulation system with a high pressure-drop rate[J].Industrial & Engineering Chemistry Research,2006(18):6153-6161. |
| [2] | Arora KA.;McCarthy TJ.;Lesser AJ. .Preparation and characterization of microcellular polystyrene foams processed in supercritical carbon dioxide[J].Macromolecules,1998(14):4614-4620. |
| [3] | Srinivas Siripurapu;Joseph M. DeSimone;Saad A. Khan;Richard J. Spontak .Low-Temperature, Surface-Mediated Foaming of Polymer Films[J].Advanced Materials,2004(12):989-994. |
| [4] | 姜修磊,赵玲,许志美.微孔聚丙烯的分形特征[J].高分子材料科学与工程,2007(06):113-116. |
| [5] | Srinivas Siripurapu;John A.Coughlan;Richard J.Spontak;Saad A.Khan .Surface-Constrained Foaming of Polymer Thin Films with Supercritical Carbon Dioxide[J].Macromolecules,2004(26):9872-9879. |
| [6] | Wong A;Leung SN;Li GYG;Park CB .Role of processing temperature in polystyrene and polycarbonate foaming with carbon dioxide[J].Industrial & Engineering Chemistry Research,2007(22):7107-7116. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%