摘要： 以木浆纤维素为原料，氢氧化钠为碱化剂，氯乙酸和环氧丙烷为醚化剂，在异丙醇-水混合溶剂体系中通过分步醚化法制备了羧甲基取代度约为0.8、羟丙基摩尔取代度约为0.2的柔性改性羧甲基纤维素（HPCMC）。采用扫描电子显微镜（SEM）、能量色散X射线能谱（EDS）、傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和热重分析（TGA）对产物的微观形貌、元素分布、化学结构、结晶性能和热稳定性进行了系统表征。结果表明：碱化和醚化反应使纤维素由长纤维转变为短棒状结构，纤维形态更加饱满；双取代基团羧甲基和羟丙基均成功接枝至纤维素骨架上；改性产物的晶体结构由有序态转变为无定形态，结晶度显著降低；改性产物热稳定性略有下降，但不影响常规实际应用。该研究为柔性纤维素醚的制备提供了研究基础。
Abstract: Using refined cotton cellulose as raw material, sodium hydroxide as alkalization agent, chloroacetic acid and propylene oxide as etherifying agents, a flexible modified carboxymethyl cellulose (hydroxypropyl carboxymethyl cellulose, HPCMC) with carboxyl methyl degree of substitution of approximately 0.8 and hydroxypropyl molar substitution of approximately 0.2 was successfully prepared via stepwise etherification in an isopropanol-water mixed solvent system. The morphology, elemental distribution, chemical structure, crystallinity and thermal stability of the product were systematically characterized by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). The results indicated that the cellulose fibers were transformed from long fibrous morphology to short rod-like structures with fuller appearance after alkalization and etherification reactions. Both carboxymethyl and hydroxypropyl groups were successfully grafted onto the cellulose backbone. The crystalline structure of the modified product transformed from an ordered state to an amorphous state, with a significant decrease in crystallinity. The thermal stability of the modified product slightly decreased, but this did not affect its practical application under conventional conditions. This study provides a research basis for the preparation of flexible cellulose ethers.
订阅方式：
①在线订阅（推荐）：www.sdchem.net.cn
②邮局订阅：邮发代号24-109
投稿方式：
①在线投稿（推荐）：www.sdchem.net.cn
作者只需要简单注册获得用户名和密码后，就可随时进行投稿、查稿，全程跟踪稿件的发表过程，使您的论文发表更加方便、快捷、透明、高效。
②邮箱投稿：sdhgtg@163.com sdhg@sdchem.net
若“在线投稿”不成功，可使用邮箱投稿，投稿邮件主题：第一作者名字/稿件题目。
投稿时请注意以下事项：
①文前应有中英文“题目”、“作者姓名”、“单位”、“邮编”、“摘要”、“关键词”；
②作者简介包括：姓名、出生年、性别、民族、籍贯或出生地、工作单位、职务或职称、学位、研究方向；
③论文末应附“参考文献”，执行国标GB/T7714-2005标准，“参考文献”序号应与论文中出现的顺序相符；
④注明作者的联系方式，包括电话、E-mail、详细的通讯地址、邮编，以便联系并邮寄杂志。
欢迎投稿 答复快捷 发表迅速