生物醋酸乙烯制备高聚合度聚乙烯醇  

Preparation of high polymerization degree polyvinyl alcohol by biorefined vinyl acetate

作　　者：王海伶[1,2] 陆泰榕 牙金艳 梁瑞雪[1,2] 韦德明 陈小鹏[1,2,3] 

机构地区：[1]广西大学化学化工学院,广西南宁530004 [2]广西石化资源加工及过程强化技术重点实验室,广西南宁530004 [3]广西生物质乙醇高分子材料工程技术研究中心,广西南宁530004 [4]广西广维化工有限责任公司,广西宜州546307

出　　处：《广西大学学报（自然科学版）》2014年第5期1173-1178,共6页Journal of Guangxi University（Natural Science Edition）

基　　金：广西自然科学基金重点项目(2011GXNSFP018011);广西科技攻关项目(1099060-2)

摘　　要：为了制备聚合度大于3 000的高聚合度聚乙烯醇,以生物醋酸乙烯为原料、偶氮二异丁腈为引发剂、甲醇为溶剂进行溶液聚合反应研究,考察了温度、搅拌转速、引发剂用量、甲醇用量和聚合时间对生物醋酸乙烯聚合反应的影响,采用正交试验法对生物醋酸乙烯溶液聚合的反应条件进行了筛选,并通过凝胶色谱对最优条件下制得的聚醋酸乙烯进行了分子量的测定。结果表明,最优的聚合反应条件为:聚合温度65℃,搅拌转速200 r/min,聚合时间2 h,甲醇用量10%,引发剂用量0.005%,所得的产品聚合度为3 640;极差分析确定了影响聚醋酸乙烯聚合度的主次顺序为:甲醇用量、引发剂用量和聚合时间;由凝胶色谱分析可知,在最优条件下可以制备得到的聚醋酸乙烯分子量分布为1.2。说明以生物醋酸乙烯为原料进行溶液聚合可以得到高聚合度、分子量分布较窄的产品。In order to obtain a polyvinyl alcohol （ PVA ） with polymerization degree greater than 3 000, solution polymerization was carried out using biorefined vinyl acetate as raw materials, azodi-isobutyronitrile （ AIBN） as initiator, methanol as solvent, respectively.The effects of temperature, stirring speed, initiator ratio, methanol dosage and polymerization time on the polymerization reac-tion of biorefined vinyl acetate were discussed systematically.Orthogonal experiments were estab-lished to get the optimum technological conditions of polymerization.The molecular weight of polyvi-nyl acetate（PVAc） were characterized by gel-chromatography （GPC）.The results showed that, the optimum reaction conditions of polymerization were： reaction temperature 65 ℃, stirring speed＆amp;nbsp;200 r/min, reaction time 2 h, methanol dosage 10%, initiator ratio 0.005%.Under the reaction conditions the polymerization degree of PVA could be 3 640.By orthogonal design method,the re-sults showed that the order of affecting polymerization degree were the methanol dosage, initiator ra-tio, reaction time.The GPC showed that the molecular weight distribution under the optimum poly-merization technique was 1.2.Solution polymerization with biological vinyl acetate （ VAc） as raw materials can get the products with higher polymerization degree and narrower molecular weight dis-tribution.

关 键 词：醋酸乙烯 聚醋酸乙烯 聚乙烯醇 生物乙烯法 

分 类 号：TQ314.2[化学工程—高聚物工业]