SYNTHESIS OF FLUOROPOLYMERS IN SUPERCRITICAL CARBON-DIOXIDE
SYNTHESIS OF FLUOROPOLYMERS IN SUPERCRITICAL CARBON-DIOXIDE
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DOI：
10.1126/science.257.5072.945
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发表时间：
1992-08-14
期刊：
影响因子：
56.9
通讯作者：
ELSBERND, CS
中科院分区：
文献类型：
--
作者：
DESIMONE, JM;GUAN, Z;ELSBERND, CS
含氟聚合物因其高性能的平衡而被用于许多技术要求高的应用中。合成可商购的无定形含氟聚合物的变体的一个显著障碍是它们在除氯氟烃（CFC）之外的大多数溶剂中的一般不溶性。在超临界流体中制备这些技术上重要的材料可以避免对CFC的环境担忧。在超临界二氧化碳中，采用自由基聚合方法，可以实现高氟丙烯酸酯单体的均相溶液聚合。此外，详细的分解率和效率因子进行了测量偶氮二异丁腈在超临界二氧化碳中，并与传统的液体溶剂得到的。
Fluoropolymers are used in many technologically demanding applications because of their balance of high-performance properties. A significant impediment to the synthesis of variants of commercially available amorphous fluoropolymers is their general insolubility in most solvents except chlorofluorocarbons (CFCs). The environmental concerns about CFCs can be circumvented by preparing these technologically important materials in supercritical fluids. The homogeneous solution polymerization of highly fluorinated acrylic monomers can be achieved in supercritical carbon dioxide by using free radical methods. In addition, detailed decomposition rates and efficiency factors were measured for azo-bisisobutyronitrile in supercritical carbon dioxide and were compared to those obtained with conventional liquid solvents.