作　　者： ; ;

机构地区： 仲恺农业工程学院化学化工学院

出　　处： 《生物质化学工程》 2020年第2期6-14,共9页

摘　　要： 以甘蔗渣中所提取的综纤维素为原料,ZnCl2溶液为溶剂,通过相转化法制备综纤维素膜,探究了综纤维素用量(以ZnCl2溶液质量计,下同)、溶解时间、凝胶化时间和所浸泡甘油质量分数等因素对湿膜的孔隙率、水通量及干膜的力学性能的影响;并通过SEM、XRD、FT-IR、TG等表征方法分析了溶解成膜机理。研究结果证实了从甘蔗渣中提取的综纤维素可直接作为原料来制备综纤维素膜,当综纤维素用量为5%、凝胶化时间3 d、溶解1 h时制得的湿膜有着最小的水通量为17.2 L/(m^2·h),孔隙率为83.3%,再经10%质量分数的甘油增塑得到的干膜有着最大的拉伸强度,为21.9 MPa,此时断裂伸长率为22.2%。根据FT-IR、TG可知以综纤维素为原料制得的膜中未包含半纤维素,半纤维素可能在溶解过程中水解或者在成膜过程中析出。根据SEM可知湿膜状态下膜内部有均匀孔洞,干燥后膜孔洞收缩形成致密结构。XRD结果表明综纤维素成膜后其中的纤维素由纤维素Ⅰ型转变为纤维素Ⅱ型,结晶度由48.8%降至41.5%。 The holocellulose film was manufactured from the holocellulose that was extracted from the bagasse with using ZnCl2 solution as solvent by using the phase inversion method. Then, the effect of holocellulose dosage(calculated by the mass of ZnCl2 solution, similarly hereinafter), dissolution time, gelation time and glycerin soaked mass fraction on the porosity, water flux of wet membrane and mechanical properties of dry film, were investigated. Sequentially, SEM, XRD, FT-IR and TG were applied to study the dissolution and film formation mechanism. The results showed that the holocellulose extracted from the bagasse could be used as raw material to prepare cellulose films. And when the holocellulose dosage was 5%, the gelation time was 3 d and the dissolution time was 1 h, the water flux of the obtained wet membrane reached the minimum of 17.2 L/(m·h), and the porosity was 83.3%. And the corresponding dry film obtained by plasticizing with 10% glycerol had the maximun tensile strength of 21.9 MPa and the elongation at break reached 22.2%.FT-IR and TG analysis showed that hemicellulose was not contained in the film made from holocellulose, and the hemicellulose may be hydrolyzed during dissolution or precipitated during film formation. SEM image showed that there are a large number of uniform holes inside the wet membrane, and the pores of the membrane shrank to form a dense structure.XRD results showed that the cellulose type Ⅰ to cellulose type Ⅱ after film formation, and the crystallinity decreased from 48.8% to 41.5%.

关 键 词： 甘蔗渣 综纤维素 纤维素膜

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