预处理对高压均质法制备微纤化纤维素结构与性能的影响
发布时间：2018-09-08 20:07
【摘要】：分别采用超声分散和机械搅拌两种方法预处理碱液中的微晶纤维素,再在1 200bar压力下通过高压均质法制备了微纤化纤维素,并研究了两种预处理方法对微纤化纤维素结构与性能的影响。通过对扫描电子显微镜(SEM),傅里叶红外光谱(FT-IR),X射线衍射(XRD)和热性能的分析表明,所得到的微纤化纤维素仍保持微晶纤维素的基本化学结构和晶型,但长径比增大了,热降解活化能降低了。其中,超声辅助处理的微纤化纤维素(MFC-2)分散更均匀,结晶度最大,说明这种预处理方法更利于形成分子排列规整度较高的聚集态结构。
[Abstract]:The microcrystalline cellulose in lye was pretreated by ultrasonic dispersion and mechanical stirring, and the microfibrillated cellulose was prepared by high pressure homogenization under 1 200bar pressure. The effects of two pretreatment methods on the structure and properties of microfibrillated cellulose were studied. The X-ray diffraction (XRD) and thermal properties of the microfibrillated cellulose were analyzed by scanning electron microscope (SEM),) Fourier transform infrared spectroscopy (FT-IR). The results showed that the microfibrillated cellulose still maintained the basic chemical structure and crystalline form of the microcrystalline cellulose, but the aspect ratio increased. The activation energy of thermal degradation is reduced. The ultrasonic assisted microfibrillated cellulose (MFC-2) was more evenly dispersed and the crystallinity was the largest, which indicated that the pretreated method was more conducive to the formation of the aggregation structure with higher molecular alignment and regularity.
【作者单位】： 郑州大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51373158) 河南省科技创新杰出人才资助项目(144200510018)
【分类号】：TQ352.1
本文编号：2231561
[Abstract]:The microcrystalline cellulose in lye was pretreated by ultrasonic dispersion and mechanical stirring, and the microfibrillated cellulose was prepared by high pressure homogenization under 1 200bar pressure. The effects of two pretreatment methods on the structure and properties of microfibrillated cellulose were studied. The X-ray diffraction (XRD) and thermal properties of the microfibrillated cellulose were analyzed by scanning electron microscope (SEM),) Fourier transform infrared spectroscopy (FT-IR). The results showed that the microfibrillated cellulose still maintained the basic chemical structure and crystalline form of the microcrystalline cellulose, but the aspect ratio increased. The activation energy of thermal degradation is reduced. The ultrasonic assisted microfibrillated cellulose (MFC-2) was more evenly dispersed and the crystallinity was the largest, which indicated that the pretreated method was more conducive to the formation of the aggregation structure with higher molecular alignment and regularity.
【作者单位】： 郑州大学材料科学与工程学院;
【基金】：国家自然科学基金资助项目(51373158) 河南省科技创新杰出人才资助项目(144200510018)
【分类号】：TQ352.1
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