التفاصيل البيبلوغرافية
| العنوان: |
Synthesis of Highly Cross-Linked Polymers in Supercritical Carbon Dioxide by Heterogeneous Polymerization |
| المؤلفون: |
Cooper, A. I., Hems, W. P., Holmes, A. B. |
| المصدر: |
Macromolecules; April 6, 1999, Vol. 32 Issue: 7 p2156-2166, 11p |
| مستخلص: |
This paper reports the synthesis of highly cross-linked polymers in supercritical CO2 (scCO2), both with and without the addition of a CO2-soluble diblock copolymer stabilizer. It was demonstrated that, under certain specific conditions, relatively uniform, nonporous poly(divinylbenzene) (PDVB) microspheres (1−5 μm diameter) can be generated in the absence of added stabilizers. The effects of cross-linker ratio, monomer concentration, cross-linker structure, and mechanical agitation were investigated. A CO2-soluble diblock copolymer stabilizer was synthesized using a modified screened anionic polymerization (SAP) method. In the presence of this stabilizer (3% w/w), much smaller PDVB microspheres (<0.5 μm diameter) were formed, and it was shown that the particle size and particle size distribution were strongly dependent on the stabilizer concentration. A range of cross-linked terpolymers containing reactive or surface-active functional groups was generated by heterogeneous copolymerization in scCO2. Finally, these methods were extended to the synthesis of functional cross-linked microspheres containing an organic dye as a host molecule. |
| قاعدة البيانات: |
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