Interactions between single latex particles and silica surfaces studied with AFM

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Engqvist, CeciliaMittuniversitetet,Institutionen för naturvetenskap (-2008) (författare)

QC 20100525
VR-Chemistry
The spreading of single styrene-acrylic latex particles on silicon oxide C surfaces was studied using atomic force microscopy (AFM). Three latexes with different glass transition temperature (Tg) were used and the effects of temperature, time and preparation method were investigated. Particle sizes and shape were measured with AFM and the contact angles were calculated. The observed rate for the spreading of latex particles was low and it took several days before the particles reached steady state, even at temperatures well above their T-g. The experimental particle spreading results deviated with two orders of magnitude from predictions Using the WLF equation for polymer diffusion. The deviation could be attributed to polymer-surface interactions that slowed down the particle spreading. The work of adhesion was calculated using two models. The results from using the regular Young-Dupre equation and a modified version of this equation that also included the mechanical properties (E-modulus and Poisson's ratio) of the latexes, were compared. For soft latex particles the results from the two models agreed well and were of the order of 75 J/m(2), but for glassy latexes the Young-Dupre equation underestimated the work of adhesion.

Forsberg, SvenMittuniversitetet,Institutionen för naturvetenskap (-2008)(Swepub:miun)svefor (författare)
Norgren, MagnusMittuniversitetet,Institutionen för naturvetenskap (-2008)(Swepub:miun)magnno (författare)
Edlund, HåkanMittuniversitetet,Institutionen för naturvetenskap (-2008)(Swepub:miun)hakedl (författare)
Andreasson, B. (författare)
Karlsson, OlaLund University,Lunds universitet,Fysikalisk kemi,Enheten för fysikalisk och teoretisk kemi,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Physical Chemistry,Physical and theoretical chemistry,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)poly-oka (författare)
MittuniversitetetInstitutionen för naturvetenskap (-2008) (creator_code:org_t)

Ingår i:Colloids and Surfaces A: Elsevier BV302:03-jan, s. 197-2030927-77571873-4359

Av författaren/redakt...: Engqvist, Cecili ...; Forsberg, Sven; Norgren, Magnus; Edlund, Håkan; Andreasson, B.; Karlsson, Ola

Om ämnet

Av lärosätet: Kungliga Tekniska Högskolan; Lunds universitet; Mittuniversitetet

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