Continuous precipitation polymerization of vinylidene fluoride in supercritical carbon dioxide: Molecular weight distribution

被引：0
|
作者：
Saraf, MK [1 ]
Wojcinski, LM [1 ]
Kennedy, KA [1 ]
Gerard, S [1 ]
Charpentier, PA [1 ]
DeSimone, J [1 ]
Roberts, GW [1 ]
机构：
[1] N Carolina State Univ, Dept Chem Engn, Raleigh, NC 27695 USA
来源：
MACROMOLECULAR SYMPOSIA | 2002年 / 182卷
关键词：
D O I：
10.1002/1521-3900(200206)182:1<119::AID-MASY119>3.0.CO;2-P
中图分类号：
O63 [高分子化学（高聚物）];
学科分类号：
070305 ; 080501 ; 081704 ;
摘要：
The surfactant-free precipitation polymerization of vinylidene fluoride (VF2) in supercritical carbon dioxide was studied in a continuous stirred autoclave. The polymerization temperature ranged from 65 to 85 degreesC, the average residence time in the reactor varied from 10 to 50 min., and the pressure was between 210 and 305 bar. Diethyl peroxydicarbonate was used as the initiator. The fractional conversion of monomer varied from 7 to 26%, the number-average molecular weight of the polymer was between about 14,000 and 79,000, and the weight-average molecular weight was between about 2 1,000 and 700,000. In many cases, the polymer exhibited a bimodal molecular-weight distribution, especially at high monomer concentrations.
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页码：119 / 129
页数：11
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