以旅大10-1油田产出含聚污水为研究对象、浮选后除油率和水体浊度降低率为考核指标,研究了不同分子量和浓度残余水解聚丙烯酰胺(HPAM)对聚铝(PAC)、二甲基二烯丙基氯化铵/丙烯酰胺共聚物[P(DMDAAC-AM)]、丙烯酰氧乙基三甲基氯化铵/丙烯酰胺共聚物[P(DAC-AM)]等3种不同阳离子型浮选剂处理效果的影响。结果表明,随着HPAM分子量和浓度的增加,PAC处理效果变化不大,但处理效果差,除油率和浊度降低率均约72%;P(DMDAAC-AM)的处理效果逐渐变差,除油率和浊度降低率均低于85%;而对于P(DAC-AM)除油率和浊度降低率均维持在90%以上。进一步优化P(DAC-AM)的浮选条件,发现其浮选时间可缩短至5 m in,用量可降低至30×10-6。
A new approach to the synthesis of dendrimer-like star polymer,[(PMMA)2PSt]4,was presented via the combination of atom transfer radical polymerization(ATRP) and ckick chemistry.Firstly four-arm bromine-terminated polystyrene(PSt-Br)4 was obtained from ATRP of styrene using pentaerythritol tetra(2-bromoisobutyrate) as an initiator,and the(PSt-Br)4 was efficiently converted to the azido-terminated polymers[(PSt-N3)4] through the bromine substitution reaction with sodium azide.Furthermore,the(PSt-N3)4 reacted with propargyl 2,2-bis[2-(bromomethyl)propionato]propionyrate via a click reaction,1,3-dipolar cycloaddition reaction,and the polymer[(PSt-Br2)4] containing eight end-bromine was obtained.The(PSt-Br2)4 could further serve as a macroinitiator for the ATRP of methyl methacrylate(MMA).Accordingly,the dendrimer-like star polymer,[(PMMA)2PSt]4 was successfully prepared.The structure of [(PMMA)2PSt]4 was characterized via IR,1H NMR,GPC and DSC.
