单糖对玉米淀粉基复合膜性能的影响

Effect of Monosaccharide Plasticizer on Mechanical Properties of Corn Starch-based Composite Film

中文关键词:  D-果糖  葡萄糖  增塑剂  复合膜  力学性能

英文关键词:D-fructose  glucose  plasticizer  composite films  mechanical property

中文摘要:

      目的 研究D-果糖和葡萄糖作为增塑剂对玉米淀粉-壳聚糖复合膜性能的影响。方法 糊化后的玉米淀粉溶液与壳聚糖溶液混合，分别添加5%，20%，35%，50%，65%（质量分数）的D-果糖及葡萄糖，均质后流延成膜；测定膜的力学性能，并通过扫描电镜、接触角、傅里叶红外扫描和X-衍射对复合膜相关特性进行表征。结果 成膜物质之间相容性好，增塑剂用量由5%增加至65%，膜的厚度增加，经D-果糖和葡萄糖增塑的复合膜抗拉强度分别由73.99，70.88 MPa减至18.08，40.53 MPa。经D-果糖增塑的复合膜断裂伸长率呈递增趋势，在添加量为65%时达到19.03%，经葡萄糖增塑的复合膜呈现递减趋势。结论 同一含量下，2种复合膜的厚度相近，抗拉强度相差不大，但经D-果糖增塑的复合膜断裂伸长率高，亲水性较好，更适合作为增塑剂应用在复合膜的制备中。

英文摘要:

      The paper aims to investigate the effects of D-fructose and glucose as plasticizers upon properties of corn starch-chitosan composite films. The gelatinized corn starch solution was blended with the chitosan solution, 5%, 20%, 35%, 50% and 65% (mass fraction) of D-fructose of glucose were added, respectively; and then they were homogenized and cast into a film. The mechanical properties of the film were measured, and morphology properties, contact angle, Fourier transform infrared spectroscopy (FTIR), and X-ray diffraction (XRD) were used for characterization. The film-forming materials had good compatibility, the concentration of plasticizer was increased from 5% to 65% while the thickness of the film was increased, but the tensile strength of D-fructose and glucose plasticized films was decreased from 73.99, 70.88 MPa to 18.08, 40.53 MPa, respectively. The elongation at break of D-fructose plasticized film revealed an increasing trend, up to 19.03% at addition of 65%; while the glucose plasticized film displayed a decreasing trend. The thickness and tensile strength of the two plasticized films are similar at the same concentration, but the D-fructose plasticized film has high elongation at break and good hydrophilicity. It is more suitable to be used as a plasticizer in the preparation of composite films.