| 叶德展,刘 磊,夏 超,代 华,张 熙.桉木木质素磺酸钙与丙烯酸接枝共聚物的分离与表征[J].中国造纸学报,2013,28(1):30-34 |
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| 桉木木质素磺酸钙与丙烯酸接枝共聚物的分离与表征 |
| Separation and Characterization of Graft Copolymer from Eucalyptus Calcium Lignosulfonate and Acrylic Acid |
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| DOI：10.11981/j.issn.1000-6842.2013.01.30 |
| 中文关键词: 桉木木质素磺酸钙 丙烯酸 接枝共聚物 分离 结构表征 |
| Key Words:eucalyptus calcium lignosulfonate acrylic acid graft copolymer separation method structure characterizations |
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| 中文摘要: |
| 针对Fenton试剂引发桉木木质素磺酸钙(HLS-Ca)和丙烯酸(AA)单体接枝反应体系，研究了传统沉淀-索氏抽提分离方法的提纯效果，在此基础上提出了离心分离-索氏抽提联用的新分离提纯方法并对该方法的分离效果进行了考察，分析了HLS-Ca、接枝共聚物（HLS-AA）的FT-IR、UV和1H-NMR谱图特征。结果表明，离心分离-索氏抽提联用法具有优于传统沉淀-索氏抽提分离方法的分离提纯效果，可用于HLS-Ca和AA接枝共聚体系各组分的分离。HLS-AA在210 nm左右的UV吸收峰强度明显高于HLS-Ca，FT-IR谱图中1727 cm-1处的吸收峰为HLS-AA的羰基吸收峰，1H-NMR谱图中化学位移为10~14处的吸收峰为HLS-AA的特征吸收峰。 |
| Abstract: |
| Graft copolymerization of eucalyptus calcium lignosulfonate (HLS-Ca) with acrylic acid (AA) was carried out using Fenton regent as a redox initiator. The separation efficiently of traditional precipitation-soxhlet extraction method was investigated, and a new centrifugal separation-combined with soxhlet extraction method was proposed. The chemical structures of HLS-Ca and the graft polymer (HLS-AA) were characterized by FT-IR, UV and 1H-NMR. The results showed that compared with traditional method, the new separation method is more effective to separate the graft polymer from homopolymer and unreacted HLS-Ca. The band at 1727 cm-1 in FT-IR spectrum is assigned to carbonyl absorption; the stronger absorbed band at 210 nm in the UV spectrum can be observed in HLS-AA and the signals between 10 and 14, assigned to the absorption for carboxyl hydrogen, also can be observed in the 1H-NMR spectrum of HLS-AA． |
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