Effect of ultrasonic separation on the structure and properties of diallyl phthalate prepolymer.
The bulk polymerization of diallyl phthalate (DAP) was carried out at high temperature (190 degrees C) without using any initiator, and the reaction was stopped before the gelation point in order to get the prepolymer of DAP. The mixture for the prepolymer and the monomer was successfully separated by a novel ultrasonic method for the first time, and the separation efficiency for the new method was obviously higher than that for the traditional reprecipitation. The product obtained by ultrasonic separation was characterized by infrared spectroscopy (IR), gel permeation chromatography (GPC) and iodine number measurement. It was shown that the average molecular weight of the prepolymer got by the ultrasonic method was lower than that of the prepolymer got by the multi-precipitation, moreover, the molecular weight distribution of the prepolymer got by the ultrasonic separation was broader. Besides, the residual unsaturation degree of the prepolymer separated by ultrasonic was slightly higher than that of prepolymer separated by reprecipitation.
Xu
Shi-Ai
SA
Key Laboratory for Preparation and Application of Ultrafine Materials of Ministry of Education, School of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China; Department of Excellent Students of Science and Technology, East China University of Science and Technology, Shanghai 200237, China. Electronic address: saxu@ecust.edu.cn.
He
Ming
M
Department of Excellent Students of Science and Technology, East China University of Science and Technology, Shanghai 200237, China.
Shi
Qing-Feng
QF
Department of Excellent Students of Science and Technology, East China University of Science and Technology, Shanghai 200237, China.
Jin
Guo-Cheng
GC
Key Laboratory for Preparation and Application of Ultrafine Materials of Ministry of Education, School of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Yao
Jun-Qi
JQ
Key Laboratory for Preparation and Application of Ultrafine Materials of Ministry of Education, School of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Yu
Ruo-Bing
RB
Key Laboratory for Preparation and Application of Ultrafine Materials of Ministry of Education, School of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
Wu
Chi-Fei
CF
Key Laboratory for Preparation and Application of Ultrafine Materials of Ministry of Education, School of Material Science and Engineering, East China University of Science and Technology, Shanghai 200237, China.
D002850:Chromatography, Gel; D008970:Molecular Weight; D010795:Phthalic Acids / Q000737:chemistry* / Q000302:isolation & purification / Q000528:radiation effects*; D011108:Polymers / Q000138:chemical synthesis / Q000528:radiation effects; D013055:Spectrophotometry, Infrared; D017550:Spectroscopy, Fourier Transform Infrared; D014465:Ultrasonics
D010795:Phthalic Acids; D011108:Polymers; C049098:diallyl phthalate