摘要
以过硫酸铵（NH4）2S2O8为引发剂，失水山犁醇单月桂酸酯（Span-20）为乳化剂，采用反相乳液聚合技术，制得了淀粉。丙烯酸接枝共聚物，研究了反应温度、引发剂浓度、单体浓度、乳化剂浓度、淀粉用量五种因素对反应速率的影响。根据单体的转化率，用线性回归法计算聚合反应速率；然后用作图法确定反应的动力学关系式，并求出反应起始阶段的表观活化能。结果表明，其动力学关系式为：Rp∝[（NH4）2S2O8]^0.51[AA]^1.18[St]^0.81[Span-20]^0.62；聚合反应恒速阶段的活化能，在53～68℃范围内为26．00kJ·mol^-1。
The inverse emulsion polymerization of starch with acrylic acid using potassium persulfate as initiator and Span-20 as emulsifier was carried out. The effects of reaction temperature, initiator concentration, monomer concentration, starch concentration and emulsifie concentration on the polymerization rate were discussed. Using methods of linear regression, the polymerization rates were determined according to the monomer conversion rates. The results showed that the kinetics equation could be expressed by the following： Rp∝[（NH4）2S2O8]^0.51[AA]^1.18[St]^0.81[Span-20]^0.62. The activity energies of the constant speed step is 26.00 kJ· mol^-1 at 53 - 68 ℃.
出处
《高分子通报》
CAS
CSCD
2008年第3期43-47,共5页
Polymer Bulletin
基金
河南大学科研基金项目(04YBRW052)
关键词
淀粉
丙烯酸
接枝共聚
反相乳液聚合
动力学
Starch
Acrylic acid
Graft copolymerization
Inverse emulsion
Kinetics
