Controlling Cellular Structure of Polypropylene Foams through Heat of Phase Transition of Water
文献类型：期刊论文
| 作者 | Li, Ming-gang; Fan, Dong-lei; Qiu, Jian; Xing, Hai-ping; Jiang, Zhi-wei; Tang, Tao |
| 刊名 | ACTA POLYMERICA SINICA
 |
| 出版日期 | 2017-12-20 |
| 期号 | 12页码:1851-1855 |
| ISSN号 | 1000-3304 |
| 关键词 | Polypropylene Foam Foaming Agent In Situ coolIng Structural Control |
| DOI | 10.11777/j.issn1000-3304.2017.17283 |
| 英文摘要 | At present, a problem in the field of polymer foaming is how to efficiently prepare polymer foamed products with large size, especially for semi-crystalline polymers (for example, polypropylene (PP)). A difficulty is that the polymer melt inside the foam samples cannot be quickly cooled after the formation of foam structure, resulting in collapse and merging of the cell structure, which may lead to form the gradient cellular structure between inside and outer layers. This problem severely restricts the development of polymer foaming technology and the application of foam products. In this work, we use PP as an example to demonstrate a novel foaming method with water as an in situ cooling medium for the first time. PP/hydrophilic polyethylene glycol (PP/PEG) blends are prepared by melt mixing, and then the blends are subjected to moulding physical foaming using CO2 as a foaming agent and water as an assistant foaming agent. The temperatures in the surface and core of the foamed samples are measured by the infrared imager. The results show that the addition of PEG makes PP has an ability to absorb water in the saturation stage. Owing to the water penetrating into the PP/PEG samples, the adsorption amount (mu) of foaming agent for PP/PEG blends is significantly higher than that for pure PP. In the foaming processing, water can quickly vaporize as a co-foaming agent. At the same time, the vaporization of water absorbs a lot of heat, which leads to the temperature drop in the inside of foam samples. Therefore the foam structures are cooled and shaped. As a result, under the same foaming conditions, the internal temperature of the PP/PEG foam is quickly fallen, and the foaming materials with higher expansion ratio are obtained compared with the case of pure PP. The mechanism of the obvious reduction in internal temperature of PP/PEG foam is discussed. This method has a universality, which can be applied in different polymer systems and different foaming processes such as moulding foaming, extrusion foaming and batch foaming. |
| 语种 | 英语 |
| 出版者 | SCIENCE PRESS |
| WOS记录号 | WOS:000419398800001 |
| 源URL | [http://ir.iccas.ac.cn/handle/121111/45413]  |
| 专题 | 中国科学院化学研究所 |
| 通讯作者 | Jiang, Zhi-wei; Tang, Tao |
| 作者单位 | Chinese Acad Sci, Changchun Inst Appl Chem, State Key Lab Polymer Phys & Chem, Changchun 130022, Jilin, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Ming-gang,Fan, Dong-lei,Qiu, Jian,et al. Controlling Cellular Structure of Polypropylene Foams through Heat of Phase Transition of Water[J]. ACTA POLYMERICA SINICA,2017(12):1851-1855. |
| APA | Li, Ming-gang,Fan, Dong-lei,Qiu, Jian,Xing, Hai-ping,Jiang, Zhi-wei,&Tang, Tao.(2017).Controlling Cellular Structure of Polypropylene Foams through Heat of Phase Transition of Water.ACTA POLYMERICA SINICA(12),1851-1855. |
| MLA | Li, Ming-gang,et al."Controlling Cellular Structure of Polypropylene Foams through Heat of Phase Transition of Water".ACTA POLYMERICA SINICA .12(2017):1851-1855. |
入库方式： OAI收割
来源：化学研究所
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