文献类型：期刊文献

英文题名：Role of ammonium chloride in preparing poly(urea-formaldehyde) microcapsules using one-step method

作者：Fan, Chuanjie[1];Tang, Juntao[1];Zhou, Xiaodong[1]

机构：[1]E China Univ Sci & Technol, Dept Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2013

卷号：129

期号：5

起止页码：2848

外文期刊名：JOURNAL OF APPLIED POLYMER SCIENCE

收录：;EI(收录号：20132716457916);WOS:【SCI-EXPANDED(收录号:WOS:000320031000057)】；

语种：英文

外文关键词：colloids; morphology; synthesis and processing

摘要：This study investigates the role of ammonium chloride in the process of preparing poly (urea-formaldehyde) (PUF) microcapsules using the one-step method. Scanning electron microscopy (SEM) and optical microscopy (OM) were used to observe the morphology of the microcapsule. The results showed that the addition of ammonium chloride in the one-step process of preparing PUF resin microcapsule decreases the pH of the system. The decrease in pH of the system is due to the reaction between ammonium chloride and formaldehyde, and more so due to the reaction between ammonium chloride and hydroxymethyl urea. In addition to reducing the pH of the system, the reaction between ammonium chloride and urea-formaldehyde resin can generate surface active substances, which drives the formed UF nanoparticles to enrich the surface of the dispersed phase. (c) 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013