高磁場NMRによるPPE-PAアロイのアロイ化機構の解析: 相容化剤との結合部位の化学構造

摘要

The molecular structure of the PPE-PA covalent links in a PPE-PA alloy was determined by the use of high resolution NMR. Chemical reaction of PPE, PA, and maleic anhydride (MAH) is thought to be very important for stabilizing the boundary of PPE and PA which is immiscible without MAH. Minor NMR peaks originating from unknown structures in soluble PPE-PA linkage from PPE-PA alloy were observed by suppressing unwanted large polymer peaks. Based on the data, we designed a model reaction of PPE and MAH. Two-dimensional (2D) NMR analysis using Total Correlation SpectroscopY (TOCSY), Heteronuclear Multiple Quantum Correlation (HMQC), and Heteronuclear Multiple Bond Correlation (HMBC) clearly showed that the unsaturated bond of MAH reacts with PPE and the acid anhydride moiety reacts with NH_2- end group of PA. The application of ~(13)C labeled malic acid (MAL) as well as ~(13)Clabeled MAH confirmed the chemical structure of the linkages.%非相溶ポリマーアロイの界面に微量に存在すると考えられる，相容化剤を介した異種ポリマーの反応物の化学構造を解析する方法として，溶媒分別やポリマーの選択的分解などの化学的な手法と高磁場による二次元NMR法とを組合せた新しい構造解析法を開発し，ポリフェニレンエーテル(PPE)-ポリアミド(PA)アロイの構造解析に適用した.その結果，PPEとPAが相容化剤である無水マレイン酸を介して化学結合している構造を初めて明らかにすることに成功した.