徳島大学 教育・研究者情報データベース(EDB)

1. 徳島大学.大学院社会産業理工学研究部.理工学域.応用化学系.物質合成化学分野(2017年4月1日〜)

1. 平野 朋広([徳島大学.大学院社会産業理工学研究部.理工学域.応用化学系.物質合成化学分野]/[徳島大学.理工学部.理工学科.応用化学システムコース.物質合成化学講座])

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2. (英) Kamiike Ryota

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3. (英) Yuki Takumi

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4. (英) Matsumoto Daishi

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5. 右手 浩一

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(英) Determination of Monomer Reactivity Ratios from a Single Sample using Multivariate Analysis of the 1H NMR Spectra of Poly[(methyl methacrylate)-co-(benzyl methacrylate)]

(英) Copolymers of methyl methacrylate (MMA) and benzyl methacrylate (BnMA) were prepared by conventional radical copolymerization in toluene at 70 °C. The 1H nuclear magnetic resonance (NMR) spectra of these copolymers were measured in various solvents at different temperatures. The signals of the methoxy protons in the MMA units and the benzyl protons in the BnMA units showed splitting mainly because of the triad monomer sequences when the temperature was increased to 150 °C in deuterated dimethyl sulfoxide. However, the splitting was not sufficient to determine the mole ratios of the triad sequences. Therefore, multivariate analysis was applied to the 1H NMR spectra of copolymers with various chemical compositions. Principal component analysis successfully extracted information on the polymer microstructures. Partial least-squares (PLS) regression successfully predicted the mole fractions of the diad monomer sequences. Then, the fractions of the diad sequences in an unknown sample prepared in benzene at 60 °C were predicted using PLS regression to determine the monomer reactivity ratios. Thus, the monomer reactivity ratios were successfully determined from a single sample using multivariate analysis of the 1H NMR spectra of copolymers of MMA and BnMA.

(日) メタクリル酸メチル/メタクリル酸ベンジル共重合体の1H NMRスペクトルに多変量解析を適用することで，2連子モノマー連鎖分布を推定し，1つのサンプルからモノマー反応性比を求めることに成功した．