As an additional high purification method of p-dioxanone monomer for a high molecular weight polymer, the sweating operation of crystalline layer obtained by layered melt crystallization from p-dioxanone-diethylene glycol system was studied. Purity and yield of p-dioxanone crystal depended mainly on the sweating temperature and sweating time. Increasing sweating time and sweating temperature, the purity of p-dioxanone crystal increase, whereas the yield of that decrease, respectively. Through the optimization of sweating operation, p-dioxanone crystal can be upgraded to very high purity over 99.9 % suited to monomer for polymerization.

• 김성일 | Kim, Sung-Il
• 전석근 | Chun, Suk-Keun
• 박두곤 | Park, Du-Goan
• 박근호 | Park, Keun-Ho
• 박소진 | Park, So-Jin
• 김철웅 | Kim, Chul-Ung