화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of Industrial and Engineering Chemistry, Vol.87, 78-89, July, 2020
DOI10.1016/j.jiec.2020.03.014  Export Citation
Converting crystalline thermosetting urea.formaldehyde resins to amorphous polymer using modified nanoclay
Eko Setio Wibowo, Muhammad Adly Rahandi Lubis1, Byung-Dae Park†, Jong Sik Kim2, and Valerio Causin3
  • Department of Wood and Paper Science, Kyungpook National University, Daegu 41566, Republic of Korea
  • 1Research Center for Biomaterial, Indonesian Institute of Science (LIPI), Jl. Raya Bogor Km. 46, Cibinong, Bogor 16911, Indonesia
  • 2Department of Wood Science and Engineering, Chonnam National University, 61186 Gwangju, Republic of Korea
  • 3Dipartimento di Scienze Chimiche, Università di Padova, via Marzolo 1, 35131 Padova, Italy
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Thermosetting urea.formaldehyde (UF) resins as the most common adhesives for wood-based composites emit formaldehyde, which forces producers to lower formaldehyde/urea (F/U) molar ratio for the UF resins synthesis. However, low-molar-ratio (below 1.0) UF resins have low formaldehyde emission at the expense of poor adhesion, which is responsible for the formation of crystalline domains as a result of hydrogen bonds between linear molecules. For the first time, this study reports the conversion of crystalline UF resins to amorphous polymers by blocking the hydrogen bonds, using transition metal ion-modified bentonite (TMI-BNT) nanoclay through in situ intercalation. The modified UF resins with 5% TMI-BNT showed an almost amorphous structure, faster curing and higher crosslinking density compared with those of neat resins, and resulted in 56.4% increase in the adhesion strength and 48.3% reduction in the formaldehyde emission. Thus, blocking hydrogen bonds in low F/U molar ratio UF resins with TMI-BNT converted crystalline UF resins to almost amorphous ones, resulting in a significant improvement in their adhesion with a low crystallinity.
Keywords:Urea.formaldehyde resins;Linear molecules;Hydrogen bonds;Crystalline;Modified nanoclay;Adhesion
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