瓜尔胶/丙烯酰胺的反相乳液接枝共聚

Synthesis of Graft Copolymer of Acryl Amide onto Guar Gum by Inverse Emulsion

以硝酸铈铵/硝酸为引发剂,在反相乳液中引发瓜尔胶/丙烯酰胺的接枝共聚反应。考察了m(丙烯酰胺AM)∶m(瓜尔胶GG)、引发剂浓度、反应温度和反应时间对接枝聚合的影响。结果表明,当m(AM)∶m(GG)=3∶2,引发剂浓度为4 mmol/L,反应时间为4 h,反应温度为45℃时,接枝共聚反应的接枝率和单体转化率分别为147.05%和87.7%。接枝共聚物的最大相对分子质量(简称分子量,下同)可达到1.73×106。红外光谱(IR)分析证明了AM确实接枝到GG分子链上,热重分析(TGA)显示接枝的AM单体并未影响GG的热稳定性。

A graft copolymer of guar gum with acryl amide was made by using ammonium ceric nitrate/ nitric acid as initiator. The effects of m （AM） ： m （ GG）, initiator concentration, reaction temperature and reaction time on polymerization were investigated. The results indicate that the grafting ratio and comonomer conversion of grafting copolymerization were 147.05% and 87.7% when re（AM）：m（GG） = 3：2, initiator concentration was 4 mmo]_/L, reaction time was 4 h and reaction temperature was 45 ℃. The largest molecule of the graft copolymer could reach a dimension of 1.73 × 10^6. The analysis of IR spectrum shows that AM was substantially grafted onto the molecular chain of guar gum. TGA indicates that the grafted AM has no effect on the thermal stability of guar gum,