• Title/Summary/Keyword: poly(vinyl alcohol) mono thiol

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Effect of Poly(vinyl alcohol) and Poly(vinyl alcohol) Mono Thiol on the Stability Properties of Poly(vinyl acetate) Latex (폴리비닐알코올과 폴리비닐알코올모노티올이 폴리초산비닐 라텍스의 안정성에 미치는 영향)

  • 이서용;박이순
    • Polymer(Korea)
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    • v.24 no.5
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    • pp.579-588
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    • 2000

  • The effects of protective colloids on the colloid stability of poly(vinyl acetate) (PVAc) latex was investigated. The stability of PVAc latex in reactive poly(vinyl alcohol) mono thiol (PVALT) (DP=1080) having 78.4% saponification value was better than poly (vinyl alcohol)(PVA) (DP=1100) having 81.6% saponification value. The colloidal stability of PVAc latex particles improved drastically with increase of the reactive PVALT. The particle surface morphology of PVAc latex was examined by transmission electron microscopy (TEM). It was shown that particle size of 1ha latexes decreased with increasing reactive PVALT concentration. Therefore, the stabilities of latex for reactive PVALT protective colloid was superior to that of PVA ones. This result is due to the introduction of many thiol groups that induce chemical bonds at PVAc latexes surface, so that the formation of PVALT-b-PVAc block copolymer via the reaction of PVAc with reactive PVALT. In addition, zeta potential of the PVAc latexes decreased with increasing sodium carbonate concentration.

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