メラミンとホルムアルデヒドとの縮合物に関する研究

DOI Web Site 被引用文献3件

書誌事項

タイトル別名
  • Studies on the Condensation Products of Melamine with Formaldehyde
  • メラミン ト ホルムアルデヒド ト ノ シュクゴウブツ ニ カンスル ケンキュウ 5
  • V. Kinetic Studies on Methylol Reaction By Kikuo Koeda*
  • 第5報メチロール化反応について

この論文をさがす

抄録

Methylol reaction (Hydroxymethylation) is the first step of amino resin formation. The kinetic studies of methylol reaction of melamine (or urea) are very complicated, because the condensation products are usualy composed with some of methylol melamines (or ureas) having different numbers of methylol groups. In order to avoid trouble and simplify the treatment, the following reaction rate equation was suggested based on a hypotheses that the rate constants of methylol reaction of every stage are equal, dx/dt=k (am-x)(f-x)-k′x where m and f is initial concentrations (mol/l) of melamine and formaldehyde, x is concentration of reacted formaldehyde as methylol group at time t, and k, k′ are rate constants of normal and reverse reaction. In this equation, the value of “a” meant the functionality of melamine (or urea) aginst formaldehyde and was chosen so as to make the equilibrium constant K (=k/k′) equal at any methylol reaction of different molar ratio (f/m). The value of “a” for melamine here obtained was 6 and that for urea was 2.4. Thus, the rate constants k for melamine was measured at the condition of molar ratio 3, pH 9.2-9.4, reaction temperature 30, 40, 50, 60°C, and activation energy obtained here was 22.3 kcal/mol and reaction heat 4.5kcal/mol.

収録刊行物

  • 高分子化學

    高分子化學 16 (165), 62-68, 1959

    公益社団法人 高分子学会

被引用文献 (3)*注記

もっと見る

詳細情報 詳細情報について

問題の指摘

ページトップへ