• Title/Summary/Keyword: starch-acrylic polymer

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A Study on the Synthesis of Starch-Acrylic Polymer by Emulsion Polymerization (유화중합에 의한 전분-아크릴 고분자의 합성에 관한 연구)

  • Lee, Mi-Suk;Ryu, Hoon;Cho, Ur-Ryong
    • Polymer(Korea)
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    • v.34 no.1
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    • pp.58-62
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    • 2010
  • The acrylic monomers were graft-polymerized to starch as matrix polymer by emulsion polymerization. Viscosity and particle size of the emulsion were increased with starch contents due to interaction with water and particle swelling toward the water phase by hydroxy group of starch. Chemical stability of the emulsion was also increased with enhancement of starch, but water and alkali resistance were reduced with increasing starch contents because of the increasement of hyrophilicity. Opacity of the starch-acrylic emulsion compound containing calcium carbonate was decreased with contents of starch by its intrinsic color. The film of starch-acrylic polymer showed more clear appearance with increasing starch contents owing to enhancement of amorphous state.

A Study on Starch-acrylic Graft Copolymerization by Emulsion Polymerization (유화중합에 의한 전분-아크릴 그래프트 공중합에 관한 연구)

  • Hwang, Ju-Ho;Ryu, Hoon;Cho, Ur-Ryong
    • Elastomers and Composites
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    • v.43 no.4
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    • pp.221-229
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    • 2008
  • Starch as matrix polymer was used to do graft copolymerization with 2-ethylhexylacrylate, methyl methacrylate and acrylic acid. The polymerization was carried out by radical emulsion polymerization with increasing contents of starch. When 0.174% of $\alpha$-amylase as enzyme for starch was added, it was found that it made the best stable emulsion. The glass transion temperature of the polymerized material was increased with starch contents. The particle size and viscosity of the emulsion increased with starch contents due to the increased hydroxy group. Peel strength also increased with contents of starch because the enhanced hydroxy group caused to increase affinity between substrate surface and polymer materials. However, the initial tackiness decreased with starch contents owing to film hardness by higher glass transion temperature.