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New routes to high solid content latexes: a process for in situ particle nucleation and growth
Author(s) -
Boutti Salima,
Graillat Christian,
McKenna Timothy F.
Publication year - 2004
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200450230
Subject(s) - nucleation , hydrogen peroxide , particle (ecology) , rheology , chemical engineering , materials science , particle size , process (computing) , polymer chemistry , chemistry , composite material , organic chemistry , computer science , oceanography , geology , operating system , engineering
A means of generating latices with solid contents well over 70% (v/v) without the use of intermediate seeds is proposed. It is demonstrated that the use of an electrically neutral initiation system (hydrogen peroxide) in the initial stages of the process, followed by an initiator yielding negatively charged free radicals (ammonium persulphate) changes the way in which the system generates stable particles. The reason for this change is the need to avoid stabilising small, homogeneously nucleated particles during the first portion of the process, and the desire to generate controlled quantities of them during the second portion. The processes are highly reproducible, as are the particle size distributions and rheological properties of the final latices.