再生纤维素／聚乙烯醇共混膜的研究

由纤维素铜氨溶液与不同体积比（１－１０％）的聚乙烯醇（ＰＶＡ）水溶液共混制备了一系列再生纤维素共混膜．扫描电镜结果表明ＰＶＡ含量大于８％时，该共混膜产生明显相分离．当ＰＶＡ低于５％时，共混膜相容性较好．膜的结晶度，抗张强度，直角撕裂强度，断裂伸长及耐热性均优于单独用钢氨液制备的再生纤维素膜．此外，用流动速率法和超滤法测定了膜的孔径，渗透性及纯水通量，结果表明共混膜的孔性没有明显变化．本文得出：再生纤维素与５％ＰＶＡ共混能改善力学性能，并且能保持其生物降解性．

STUDY ON BLEND MEMBRANE FROM REGENERATED CELLULOSE / POLYVINYL ALCOHOL

egenerated cellulose blend membranes were prepared by coagulating a mixed solution of cellulose cuoxam (I) and aqueous polyvinyl alcohol (Ⅱ). SEM results showed that the phase separation on the mixing were seriously formed when the Ⅱ-content was higher than 8% by volume. But, when the Ⅱ-contCnt of blend was smaller than 5%, 1 and Ⅱ are miscible, and the degree of crystallinity, tensile strength, tear strength, breaking elongation and thermostability of the blend membranes were superior to those of membrane from pure cellulose cuoxam. In addi non, the mean pore diameter, ethanol permeability and the transmembrane flows of water obtained by using a flow rate and ultrafiltration methods suggeted that the pore properties of the blend membranes were almost not variabe. In conclu sion, the mechanical properties of blend membranes from regenerated cellulose / 5% polyvinyl alcohol were improved, and the blend membranes keep biodegradability yet.