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8590400 
Journal Article 
Preparation and modification of red phosphorus microcapsules based on ethyl cellulose 
Cheng, C; Du, S; Lu, Y 
2019 
Yes 
Cailiao Kexue yu Gongyi
ISSN: 1005-0299 
27 
6 
90-96 
Chinese 
Microencapsulation red phosphorus is generally prepared by in-situ method at present, while the preparation process is complex and the shell raw material may be harmful to the environment. To solve this problem, biodegradable material ethyl cellulose (EC) was selected as the shell material, and phase separation method was applied to prepare microcapsule red phosphorus(MRP) under normal temperature and neutral environment. Meanwhile, in order to improve the practical performance of MRP, tetraethoxysilane (TEOS) was added under alkaline circumstance to prepare silica gel/ethyl cellulose composite shell material microencapsulation red phosphorus (SiMRP). The morphology and encapsulation ratio of the MRP were tested by FTIR, SEM, and XPS, and the thermal stability, water absorption, and sensitivity of the samples were characterized. Results indicate that the MRP prepared by phase separation method possessed a coating ratio of 88.2%. The introduction of the EC shell structure improved the thermal stability of the red phosphorus, and the ignition temperature was 50 ℃ higher than that of the pristine red phosphorus. The water absorption after 10 d and the friction sensitivity of MRP decreased to 6.8% and 34%, respectively. With the addition of 1 mL TEOS as modification agent, the coating ratio reached 94.1%. The thermal stability of the SiMRP was superior to that of MRP, and the ignition temperature was 90 ℃ higher than that of MRP. The water absorption of the SiMRP decreased to 4.5% and the friction sensitivity decreased to 20%. © 2019, Editorial Board of Material Science and Technology. All right reserved. 
Ethyl cellulose; Microcapsule; Red phosphorus; Silica gel; Stability