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Interfacial interactions and mechanical properties of mineral filled polymer composites: wollastonite in PMMA polymer matrix
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Sustainable Process Engineering.
1998 (English)In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, ISSN 0927-7757, E-ISSN 1873-4359, Vol. 133, no 1, p. 107-117Article in journal (Refereed) Published
Abstract [en]

The nature of stearic acid and polymethylmethacrylate (PMMA) adsorption onto wollastonite has been studied from basic, neutral and acidic organic solvents by infrared (IR) spectroscopy. The roles of acid-base interactions on adsorption and wollastonite dispersion in polymer matrix have been discussed with the determined mechanical properties of surface-treated (stearic acid) and untreated wollastonite-filled PMMA polymer composites. Maximum adsorption of either stearic acid or PMMA occurs from a nonpolar solvent, and the adsorption is found to decrease with increasing acidity or basicity of the solvents. The adsorption corresponds to two geometrical layers either from nonpolar (carbon tetrachloride) or from slightly basic (benzene) and acidic (methylene dichloride) solvents. Increased acidity (chloroform) or basicity (tetrahydrofuran) of solvents led to a monolayer or a fraction of the monolayer coverage. The primary adsorption of stearic acid is thought to be the formation of hydrogen bonds between surface hydroxyl groups and carboxylic acid groups. The tensile and impact strength properties of the composites that are filled with stearic acid-treated wollastonite are improved when compared to the untreated filled composite. The results suggest a stronger interfacial bonding between stearic acid and filler than that of polymer to the filler. Thus, the application of stearic acid for surface modification of acidic fillers such as wollastonite is emphasized.

Place, publisher, year, edition, pages
1998. Vol. 133, no 1, p. 107-117
National Category
Physical Chemistry Metallurgy and Metallic Materials
Research subject
Chemistry of Interfaces; Mineral Processing
Identifiers
URN: urn:nbn:se:ltu:diva-9053DOI: 10.1016/S0927-7757(97)00130-1Scopus ID: 2-s2.0-0032520198Local ID: 79df1340-b1d3-11db-bf9d-000ea68e967bOAI: oai:DiVA.org:ltu-9053DiVA, id: diva2:981991
Note
Godkänd; 1998; 20070131 (pafi)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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Rao, K. HanumanthaForssberg, EricForsling, Willis

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Colloids and Surfaces A: Physicochemical and Engineering Aspects
Physical ChemistryMetallurgy and Metallic Materials

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