摘要
探讨了十二醇聚氧乙烯醚(AEO)的EO链长对其临界胶束浓度(cmc)、表面张力(γcmc)、胶束生成自由能(ΔGm)、分子面积(Acmc)和亲水亲油平衡(HLB)值等表面性能的影响;同时研究了不同EO链长的AEO对质量分数25%代森锰锌水悬浮剂(SC)的流变性能[黏度、储能模量(G')、流动点时的应变(γflow)、触变性]和物理贮存性能(热贮前悬浮率、热贮后悬浮率和倾倒性)的影响.结果发现,AEO的cmc,γcmc,ΔGm,Acmc和HLB值随着EO链长的增加而增大;AEO能够明显改善代森锰锌SC的黏度,以AEO-9所制备的SC黏度最小,且AEO的EO链长越长,所对应的SC结构恢复越慢,恢复慢的样品其倾倒残留率过高;G'和γflow能反映SC内部结构变化,可作为评价农药SC物理稳定性流变学指标.
The paper studies the critical micelle concentration （cmc）, the equilibrium surface tension （γcmc）, the standard free energy of micellization （AGm ） , the area per molecular at cmc （Acmc ） and hydrophile lipophile balance（HLB）, which are affected by the function of the oxyethylene group （EO） number in the alcohol ethoxylate（AEO）. It also studies the influence of AEO with different EO number as dispersants on the rheological properties（ viscosity, storage modulus G＇, γflow and thixotropy） and the physical stability（ the suspension rate before and after the hot storage, residual pourability ratio） of Mancozeb （25 % ） suspension concentrate（SC）. As the value of the oxyethylene group number increase from 4 to 20, the values of emc, T AGm, Acmc and HLB are rising. The adding of AEO can reduce the viscosity of Mancozeb（25% ） SC, and the SC with AEO-9 has the lowest viscosity. With the increase of the EO chains in AEO, the thixotropy recovery of SC which has higher residual pourability ratio decreases gradually. Through strain sweep, we find the values of G＇ and γflow reflect the structural variation of the SC, and then G＇ and γflow Can be used as suitable SC stability indicators.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2014年第10期2182-2190,共9页
Chemical Journal of Chinese Universities
基金
国家自然科学基金(批准号:21172147)
国家'八六三'计划项目(批准号:2006AA100204)资助~~
