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Time induced spreading and adhesion of latex polymers
Mid Sweden University, Faculty of Science, Technology and Media, Department of Chemical Engineering.
2013 (English)Licentiate thesis, comprehensive summary (Other academic)
Place, publisher, year, edition, pages
Sundsvall: Mid Sweden University , 2013. , p. 47
Series
Mid Sweden University licentiate thesis, ISSN 1652-8948
National Category
Chemical Engineering
Identifiers
URN: urn:nbn:se:miun:diva-20951ISBN: 978-91-87103-87-2 (print)OAI: oai:DiVA.org:miun-20951DiVA, id: diva2:683387
Supervisors
Available from: 2014-01-03 Created: 2014-01-03 Last updated: 2014-01-03Bibliographically approved
List of papers
1. The adhesive behavior of extracted Latex polymers towards Silicon oxide and Cellulose
Open this publication in new window or tab >>The adhesive behavior of extracted Latex polymers towards Silicon oxide and Cellulose
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2013 (English)In: International Journal of Adhesion and Adhesives, ISSN 0143-7496, E-ISSN 1879-0127, Vol. 44, p. 250-258Article in journal (Refereed) Published
Abstract [en]

The objective with this work is to compare the adhesive behavior for latex polymers of different Glass transition Temperatures (Tg) at different length scales and with different contact times. This is accomplished by two techniques: AFM colloidal probe force measurements and JKR-measurements. The aim is to compare the results from these two techniques and relate them to the interaction of the latex polymers towards oxidized silicon wafers and silica/cellulose probes. Theory suggests that altering the short timeframes used in the colloidal probe technique does not affect the ranking of the adhesion for the different polymers, but for the macroscopic JKR-technique it influences the measured work of adhesion. It is therefore important to let the system reach a steady state before assuming complete spreading and adhesion. AFM and JKR measurements showed the same trends where the polymer with lowest content of styrene has the lowest Tg and the highest adhesion, due to the larger polymer chain mobility.

Keywords
latex, atomic force microscopy, adhesion, Polymer thin film
National Category
Physical Chemistry
Identifiers
urn:nbn:se:miun:diva-18457 (URN)10.1016/j.ijadhadh.2013.02.017 (DOI)000320485200031 ()2-s2.0-84876560008 (Scopus ID)
Projects
Interactions between dispersion polymers and cellulose
Available from: 2013-02-12 Created: 2013-02-12 Last updated: 2017-12-06Bibliographically approved
2. Interactions between single latex particles and silica surfaces studied with AFM
Open this publication in new window or tab >>Interactions between single latex particles and silica surfaces studied with AFM
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2007 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 302, no 1-3, p. 197-203Article in journal (Refereed) Published
Abstract [en]

The spreading of single styrene-acrylic latex particles on silicon oxide 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 Tg. 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-Dupré 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/m2, but for glassy latexes the Young-Dupré equation underestimated the work of adhesion.

Keywords
Adhesion, AFM, latex, contact angle, surface interaction
National Category
Chemical Sciences
Identifiers
urn:nbn:se:miun:diva-3924 (URN)10.1016/j.colsurfa.2007.02.032 (DOI)000247192300029 ()2-s2.0-34248178443 (Scopus ID)4303 (Local ID)4303 (Archive number)4303 (OAI)
Note

VR-Chemistry

Available from: 2008-09-30 Created: 2009-11-02 Last updated: 2017-12-12Bibliographically approved
3. Changes with aging in the surface hydrophobicity of coated paper
Open this publication in new window or tab >>Changes with aging in the surface hydrophobicity of coated paper
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2010 (English)In: TAPPI Journal, ISSN 0734-1415, Vol. 9, no 5, p. 40-46Article in journal (Refereed) Published
Abstract [en]

Time-dependent changes in the surface properties of coated papers were studied as the evolution of surface hydrophobicity of laboratory and commercially coated papers. We measured the apparent contact angles on the papers during several weeks post-production. Hydrophobicity upon aging increased for all samples made from traditional coating colors on mechanical base stock and on base stock made from cotton linters. Accelerated aging by heat treatment intensified the increase of the apparent contact angles and accelerated the time-dependent behavior. A key mechanism in these changes may be the spreading of latex particles in a coating.

National Category
Chemical Engineering
Identifiers
urn:nbn:se:miun:diva-11838 (URN)000278601200004 ()2-s2.0-78650116607 (Scopus ID)
Available from: 2010-07-14 Created: 2010-07-14 Last updated: 2017-12-12Bibliographically approved

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