Advances in fluoropolymer dispersions

摘要

Multimodal high-performance fluoropolymer dispersions have been developed thanks to Solvay Solexis' proprietary technology which permits bimodal particle-size distributions to be obtained,not only by blending standard fluoropolymer dispersions (diameter 250 nm) with nano-latexes (diameter from 10 to 60 nm),but also directly from polymerisation,exploiting a competitive homoge-neous/coagulative and droplet nucleation mechanism.It has been found that poly (tetra-fluoroethylene)(PTFE) bimodal dispersions have optimal film-forming and particle-packing behaviour at a size ratio of about 0.5,corresponding with the best fit to the random close-packing model,while no significant improvements are observed when the aforesaid size ratio is 0.3