1篇
您的检索式：作者名="YOU Jiangan"
|
|
|
题名
|
作者
|
年代
|
出处
|
被引量
|
| 1 | Introduction and Influence of Water in the Preparation of Crosslinked PVC Foam by Isocyanate显示文摘In the preparation process of crosslinked polyvinyl chloride(c-PVC)foam by isocyanate,the formulated mixture is generally required to be carried out under the condition of isolated water,so as to avoid the mixing difficulties caused by the reaction between the introduced water and isocyanate.In this paper,NaHCO_(3) was added to the mixture to indirectly introduce water into the system,and the effects of NaHCO_(3) on the cell structure and curing time of c-PVC foam were investigated.The results showed that NaHCO_(3) not only played a role of foaming agent,but also was a good nucleating agent for cells.At the same time,the introduction of NaHCO_(3) held back the exudation of modified diphenylmethane-4,4'-diisocyanate(MDI)on the cell wall.The effects of NaHCO_(3) on the cell structure and aggregation structure of c-PVC foam were studied by thermogravimetric analysis,infrared spectroscopy and scanning electron microscopy.The results showed that decomposition of NaHCO_(3) occurred during the molding stage,which made small amount of MDI react with water to form polyurea,improved the compatibility of MDI with PVC and inhibited the exudation of MDI. | BI Xiang LI Minggang LU Min YOU Jiangan XUE Jian YU Haihui JIANG Zhiwei TANG Tao | 2023 | Chemical Research in Chinese Universities2023，39，5： | 0 |
您所在的机构暂未开通此部分的功能，请联系管理员