預(yù)處理對高壓均質(zhì)法制備微纖化纖維素結(jié)構(gòu)與性能的影響
發(fā)布時間:2018-09-08 20:07
【摘要】:分別采用超聲分散和機械攪拌兩種方法預(yù)處理堿液中的微晶纖維素,再在1 200bar壓力下通過高壓均質(zhì)法制備了微纖化纖維素,并研究了兩種預(yù)處理方法對微纖化纖維素結(jié)構(gòu)與性能的影響。通過對掃描電子顯微鏡(SEM),傅里葉紅外光譜(FT-IR),X射線衍射(XRD)和熱性能的分析表明,所得到的微纖化纖維素仍保持微晶纖維素的基本化學(xué)結(jié)構(gòu)和晶型,但長徑比增大了,熱降解活化能降低了。其中,超聲輔助處理的微纖化纖維素(MFC-2)分散更均勻,結(jié)晶度最大,說明這種預(yù)處理方法更利于形成分子排列規(guī)整度較高的聚集態(tài)結(jié)構(gòu)。
[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.
【作者單位】: 鄭州大學(xué)材料科學(xué)與工程學(xué)院;
【基金】:國家自然科學(xué)基金資助項目(51373158) 河南省科技創(chuàng)新杰出人才資助項目(144200510018)
【分類號】:TQ352.1
本文編號: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.
【作者單位】: 鄭州大學(xué)材料科學(xué)與工程學(xué)院;
【基金】:國家自然科學(xué)基金資助項目(51373158) 河南省科技創(chuàng)新杰出人才資助項目(144200510018)
【分類號】:TQ352.1
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