【摘要】 以氧化改性过后的马铃薯淀粉为原料,经过交联、增塑、增强后,采用流延的方法制备生物降解塑料膜,研究了改性淀粉、丙三醇、甲醛、尿素、聚乙烯醇、反应温度等因素对模力学性能的影响。结果表明,影响膜强度主要因素为丙三醇的含量,其次为甲醛、改性淀粉、尿素的量、反应时间及聚乙烯醇的量。最佳条件为:水100 mL,改性淀粉3.3 g,尿素1.0 g,聚乙烯醇1.2 g,甲醛1.6 mL,丙三醇0.6 mL,反应时间110 min。在此条件下,制得膜的拉伸强度为20.05 MPa,断裂伸长率为65%。更多还原

【Abstract】 We take oxidation modified potato starch as raw material,after the step of cross linking,plasticing and reinforcing,to prepare biodegradable plastic film by the method of continuation flow membrane.Effects of modified starch,glycerol,formaldehyde,urea,polyvinyl alcohol,reaction temperature,and other factors on capability of the plastic film were researched.The results shows that the main factor on effecting film strength is amount of glycerin,secondly,the amount of formaldehyde,modified starch,urea,the reaction time and the amount of polyvinyl alcohol.The optimum conditions were as follows:H2O 100 mL,modified starch 3.3 g,urea 1.0 g,polyvinyl alcohol 1.2 g,formaldehyde 1.6 mL,glycerol 0.6 mL,reaction time is 110 min.Under this condition,the tensile strength of this film is 20.05 MPa,and the elongation at break is 65%.更多还原