Structure and rheology of aqueous poly(vinyl acetate) dispersions modified with montmorillonite
It has been shown that the rheological properties and resistance to sedimentation of aqueous poly(vinyl acetate) (PVA) latexes, which are used for the preparation of coatings and adhesives, can be controlled by adding sodium montmorillonite (MMT). The adding of MMT initiates gelation of the PVA disp...
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| Veröffentlicht in: | Colloid journal of the Russian Academy of Sciences 2017-09, Vol.79 (5), p.588-595 |
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| container_title | Colloid journal of the Russian Academy of Sciences |
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| creator | Gerasin, V. A. Kurenkov, V. V. Pashkov, O. V. Ilyin, S. O. |
| description | It has been shown that the rheological properties and resistance to sedimentation of aqueous poly(vinyl acetate) (PVA) latexes, which are used for the preparation of coatings and adhesives, can be controlled by adding sodium montmorillonite (MMT). The adding of MMT initiates gelation of the PVA dispersions, which manifests itself as the appearance of the yield stress, thixotropy, and viscoelasticity. X-ray diffraction analysis of the complex dispersions and films based on them has shown a transition from exfoliated to intercalated clay tactoids with an increase in their content. In view of the complex composition of the PVA latexes, which contain a stabilizer (poly(vinyl alcohol)) and a plasticizer (dibutyl phthalate), the components that are predominantly intercalated into the MMT interplanar space, have been identified. The highest yield stress and rigidity of the structural network, which arises in a sample as a result of the joint coagulation of PVA and MMT particles, are observed upon the incorporation of 1.2 wt % MMT into the latex. |
| doi_str_mv | 10.1134/S1061933X17050064 |
| format | Article |
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In view of the complex composition of the PVA latexes, which contain a stabilizer (poly(vinyl alcohol)) and a plasticizer (dibutyl phthalate), the components that are predominantly intercalated into the MMT interplanar space, have been identified. 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In view of the complex composition of the PVA latexes, which contain a stabilizer (poly(vinyl alcohol)) and a plasticizer (dibutyl phthalate), the components that are predominantly intercalated into the MMT interplanar space, have been identified. 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X-ray diffraction analysis of the complex dispersions and films based on them has shown a transition from exfoliated to intercalated clay tactoids with an increase in their content. In view of the complex composition of the PVA latexes, which contain a stabilizer (poly(vinyl alcohol)) and a plasticizer (dibutyl phthalate), the components that are predominantly intercalated into the MMT interplanar space, have been identified. The highest yield stress and rigidity of the structural network, which arises in a sample as a result of the joint coagulation of PVA and MMT particles, are observed upon the incorporation of 1.2 wt % MMT into the latex.</abstract><cop>Moscow</cop><pub>Pleiades Publishing</pub><doi>10.1134/S1061933X17050064</doi><tpages>8</tpages></addata></record> |
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| subjects | Adhesives Chemistry Chemistry and Materials Science Clay Dibutyl phthalate Dispersions Gelation Latex Montmorillonite Polymer Sciences Rheological properties Rheology Sedimentation Surfaces and Interfaces Thin Films Thixotropy Vinyl acetate Viscoelasticity Yield strength Yield stress |
| title | Structure and rheology of aqueous poly(vinyl acetate) dispersions modified with montmorillonite |
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