聚乙烯醇醇解度影响因素及力学性能研究

Study on the influencing factors of alcoholysis degree of polyvinyl alcohol and its mechanical properties

研究了影响聚醋酸乙烯酯醇解度的因素,观察PVA的性能。用超声仪器超声醇解聚醋酸乙烯酯(PVAC),调节不同的温度和加入催化剂(NaOH)的量,制得PVA,通过测定PVA的挥发分、PVA中乙酸钠的含量和PVA中氢氧化钠的含量计算出PVA的醇解度,从实验中得出温度和催化剂对醇解度的影响,使用红外光谱仪得到红外光谱图,用它进行表征,用万能力学实验机,测定它的力学性能,深入了解PVA的性能。实验结果表明为含水量、不同的温度和不同的氢氧化钠浓度都影响着醇解度,在含有2.5%氢氧化钠和40℃的甲醇中,聚醋酸乙烯酯醇解的最完全,它的醇解度为97.54%。

The factors affecting the alcoholysis degree of polyvinyl acetate were studied and the properties of PVA were observed.PVA was prepared by ultrasonic alcoholysis of polyvinyl acetate(PVAC)with different temperatures and the amount of catalyzer(NaOH)added.The alcoholysis degree of PVA was calculated by measuring the volatile content of PVA,the content of sodium acetate in PVA and the content of sodium hydroxide in PVA.The effects of temperature and catalyst on alcoholysis degree were obtained from experiments.Infrared spectra were obtained by infrared spectroscopy,and characterized.The mechanical properties of PVA were measured by universal experimental machine,and the properties of PVA were deeply understood.The experimental results showed that the alcoholysis degree was affected by water content,temperature and concentration of sodium hydroxide.In methanol containing 2.5%sodium hydroxide and 40℃,the alcoholysis degree of polyvinyl acetate was the most completely.The alcoholysis degree of polyvinyl acetate was 97.54%.