| SYNTHESIS, CROSSLINKING MECHANISM AND PROPERTIES OF A POLYACRYLATE/POLYURETHANE COMPOSITE COATING |
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| 作者姓名： | 唐黎明 郭伟 周其庠 |
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| 作者单位： | Department of Chemical Engineering，Tsinghua University，Beijing 100084，Department of Chemical Engineering，Tsinghua University，Beijing 100084，Department of Chemical Engineering，Tsinghua University，Beijing 100084 |
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| 摘 要： | A polyacrylate/polyurethane (P(A) / P(U)) composite coating has been prepared bycrosslinking an acetoacetylated polyacrylate with a vinylic group terminated polyurethaneat room temperature. A model Michael reaction between ethyl acetoacetate (EAA) andmethyl acrylate (MA) was designed to study the crosslinking mechanism. It was foundthat the two active hydrogen atoms in acetoacetyl group can both add to vinylic groupsand the yield of mono- and bis-adducts are much affected by the molar ratio of acetoacetylto vinylic groups. Higher crosslinking degree and better properties could be obtained withdecreasing the molar ratio of the two active groups from 1/1 to 0.6/1 in the compositecoatings.
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| 收稿时间： | 1996-06-02 |
SYNTHESIS, CROSSLINKING MECHANISM AND PROPERTIES OF A POLYACRYLATE/POLYURETHANE COMPOSITE COATING |
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| TANG Liming,GUO Wei,ZHOU Qixiang.SYNTHESIS, CROSSLINKING MECHANISM AND PROPERTIES OF A POLYACRYLATE/POLYURETHANE COMPOSITE COATING[J].Chinese Journal of Polymer Science,1997,0(3):242-247. |
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| Authors: | TANG Liming GUO Wei ZHOU Qixiang |
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| Institution: | Department of Chemical Engineering; Tsinyhua University; Beijing 100084 |
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| Abstract: | A polyacrylate/polyurethane (P(A) / P(U)) composite coating has been prepared bycrosslinking an acetoacetylated polyacrylate with a vinylic group terminated polyurethaneat room temperature. A model Michael reaction between ethyl acetoacetate (EAA) andmethyl acrylate (MA) was designed to study the crosslinking mechanism. It was foundthat the two active hydrogen atoms in acetoacetyl group can both add to vinylic groupsand the yield of mono- and bis-adducts are much affected by the molar ratio of acetoacetylto vinylic groups. Higher crosslinking degree and better properties could be obtained withdecreasing the molar ratio of the two active groups from 1/1 to 0.6/1 in the compositecoatings. |
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| Keywords: | Polyacrylate Polyurethane Composite coating Crosslinking mechanism |
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