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首页> 外文会议>New Technologies in Non-wood Fiber Pulping and Papermaking >PREPARATION AND CHARACTERIZATION OF CARBOXYMETHYLCELLULOSES AND METHYLCELLULOSES FROM ABACA, FLAX, HEMP, JUTE AND SISAL PULPS
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PREPARATION AND CHARACTERIZATION OF CARBOXYMETHYLCELLULOSES AND METHYLCELLULOSES FROM ABACA, FLAX, HEMP, JUTE AND SISAL PULPS

机译：ABACA，亚麻，大麻，黄麻和剑麻浆中羧甲基纤维素和甲基纤维素的制备和表征

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摘要

The preparation of carboxymethylcellulose (CMC) and methylcellulose (MC) from non-wood pulps (abaca, flax, hemp, jute and sisal) bleached by Elemental Chlorine Free (ECF) sequences was studied. The carboxymethylation was carried out by one and two successive reaction steps in isopropanol slurry using monochloroacetic acid at 55 ℃ for 3.5h. The methylation was carried out twice in isopropanol slurry using iodomethane at 60 ℃ for 22h after the pulp was mercerized in 50% NaOH solution for 1h at ambient temperature. Fourier Transform Infrared (FTIR) spectra showed the existence of substituted groups on the synthesized molecules. Substitution patterns of MC were determined by ~(13)C Nuclear Magnetic Resonance (NMR) spectroscopy. Substitution patterns of CMC were determined by H-NMR spectroscopy. The molecular weights of the water-soluble CMC and MC were determined by Size Exclusion Chromatography (SEC). CMC and MC of such better properties as greater degrees of substitution, molecular weights, viscosities and intrinsic viscosities were prepared from the pulps with higher accessibilities. The factors influencing the preparation of CMC and MC from these pulps were discussed.
机译：研究了用无元素氯（ECF）序列漂白的非木浆（蕉麻，亚麻，大麻，黄麻和剑麻）制备羧甲基纤维素（CMC）和甲基纤维素（MC）的方法。羧甲基化反应是在异丙醇浆液中使用一氯乙酸在55℃下通过一个和两个连续的反应步骤进行的3.5h。将纸浆在环境温度下于50％NaOH溶液中丝光1h后，在60℃下使用碘甲烷在异丙醇浆液中进行两次甲基化反应22h。傅立叶变换红外光谱（FTIR）显示合成分子上存在取代基。通过〜（13）C核磁共振（NMR）光谱确定MC的取代模式。通过1 H-NMR光谱确定CMC的取代模式。通过尺寸排阻色谱法（SEC）确定水溶性CMC和MC的分子量。由具有较高可及性的纸浆制备具有更好取代度，分子量，粘度和固有粘度等更好性能的CMC和MC。讨论了影响由这些纸浆制备CMC和MC的因素。

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