中文摘要：

以3种不同聚合度的聚乙烯醇（PVA0588、PVA1788、PVA2488）为原料,添加相同质量分数的碱木质素采用流延法制备共混膜.采用电子万能试验机、扫描电子显微镜、热重分析仪等分析手段对共混膜进行分析表征,并测定了共混膜在不同极性溶剂中力学性能的变化.结果表明：在碱木质素添加量为15％时,碱木质素可较好地分散于PVA相中,3种共混膜的力学性能与各自对应的纯PVA膜相比都有了一定的提高,且当聚合度由PVA0588变化到PVA2488时,共混膜的拉伸强度从35.16 MPa增加到48.30 MPa,提高了37.37％,断裂伸长率从172.22％增加到247.08％,提高了43.47％；由于PVA聚合度的增大和碱木质素的添加,均使得共混膜的耐溶剂性能和热稳定性增加.

英文摘要：

With the same addition of alkaline lignin, the blend membranes were fabricated by alkaline lignin and three different polymerization degree of poly （vinyl alcohol） according to the film casting method. The properties of membranes were observed by intelligent electronic universal testing machine, SEM and TG. Also the mechanical properties of the membranes in solvents of different polarities were analyzed. The results showed that alkaline lignin dispersed well in PVA domain and the addition of alkaline lignin improved the mechanical properties of PVA membranes. When the mass fraction of alkaline was 15% and polymerization degree changed from PVA0588 to PVA2488, the tensile strength of blend membranes increased from 35.16 MPa to 48.30 MPa. Which improved 37.37%, and the elongation at break of blend membranes increased from 172.22% to 247.08%, which improved 43.47%. The solvent ＂resistance and thermal stability of the membranes went up with the increase of polymerization degree of poly （vincl alcohol） and the addition of alkaline lignin.