Abstract
Coagulation of natural rubber latex suspensions into an elastic gel is the first step of their processing into rubber. We studied this transition under controlled acidification conditions with the aim of identifying the main parameters controlling gel formation. The onset of aggregation and the percolation events observed during continuous acidification were monitored on a large range of volume fractions by a combination of light-scattering techniques adapted to the different degrees of suspension opacity (namely, diffusing wave spectroscopy, static light scattering and turbidimetry) and by rheology. We consequently established the state diagram of NRL particles in the pH–ϕv space during acidification. Within this diagram, we identified three states: a suspension, a two-phase macroscopically separated system in between a gel and a suspension, and a gel. The rheological properties of the gels were characterized as a function of the volume fraction ϕv. The elastic modulus scale with ϕv3.35, it shows remarkable consistency independently of the acidification kinetics and final pH.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Colloids and Surfaces A: Physicochemical and Engineering Aspects
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
