Spherical agglomeration

Emulsion polymerization requires the use of free radical initiators, fluorinated surfactants, and often chain transfer agents. The polymer isolated from the reaction vessel consists of agglomerated spherical particles ranging in diameter from 0.2 to 0.5 jm.56 It is then dried and supplied as a free-flowing powder or as pellets, depending on the intended use. If very pure PVDF is required, the polymer is rinsed before the final drying to eliminate any impurities such as residual initiator and surfactants.57... 

No significant difference of texture between the size fractions was observed. Dissolution tests also showed no considerable change in the dissolution rate of the SDDP fractions analyzed. SDDP particles were shown to consist of agglomerates comprised of micronized drug substance and excipients particles. The SDDP agglomerated spherical particles are porous. The intraparticular pore diameter measured value is approximately 0.6pm for all specimens analyzed. 

Coal Calcinating, briquetting, tumble agglomeration, spherical agglomeration Build-up... 

It is likely, therefore, that pores analyzed by the nitrogen sorption/desorption method are Interstices in the subsurface strata. In the membranes presented here, these strata consisted of agglomerated spherical nodules. It is worth noting that curve maxima in Figures 4b,d are in the unexpected order A>B>C. 

Basu, D. Banerjee, A.N. Misra, A. (1992). Comparative Rheological Studies on Jute-Fibre-and Glass-Fibre-Filled Polypropylene Composite Melts. Journal of Applied Polymer Science, Vol.46, No.ll, pp. 1999-2009 ISSN 0021-8995 Bigg, D.M (1982). Rheological Analysis of Highly Loaded Polymeric Composites Filled with Non-Agglomerating Spherical Filler Particles. Polymer Engineering and Science, Vol.22, No.8, p>p. 512-518 ISSN 0032-3888... 

Bigg, D.M. (1982) Rheological analysis of highly loaded pol5mneric composites filled with non-agglomerating spherical filler particles, Polym. Engg Sci., 22,512-18. 

Open pore polymers fall into the last category, because small interconnecting pores exist between randomly packed chains or spheres. Open pore structures are not like conventional foams that have unit cells, because they are composed of agglomerated spherical particles (1-10 p,m diameter) bonded to one another in a rigid, highly permeable structure. 

Bigg, D.M., Rheological Analysis of Highly Loaded Polymeric Composites filled with Non-Agglomerating Spherical Filler Particles. Polym. Eng. Sci. 22 [8] 512-518 (1982). 

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