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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Polyhexahydrotriazine ： ウィキペディア英語版 Polyhexahydrotriazine Polyhexahydrotriazines (PHTs) are polymers of hexahydro-1,3,5-triazines, a class of heterocyclic compounds with the formula (CH2NR)3. They are among the strongest known thermosetting plastics and are stable to solvents at pH > 3, but decompose to the monomers in acidic solutions. ==Synthesis== Various PHTs have been synthesized at room temperature in one step in the early 2000s; they were considered impractical due to their poor mechanical properties. It was later elucidated that, due of the temperature of synthesis, the poor mechanical properties observed were likely due to poly(hemiaminal) formation and not PHT formation. Another PHT (1.6) was produced in 2014 in two steps: first 4,4'-oxydianiline was polymerized using paraformaldehyde creating a hemiaminal dynamic covalent network (HDCN). Heating an HDCN to 200 °C transformed it into the PHT 1.6, also a highly cross-linked polymer network.〔 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Polyhexahydrotriazine」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.