论文部分内容阅读
测定了水面上六种环氧乙烷环氧丙烷共聚多元醇所成表面膜的π-A关系,其中三种是Plaronie系列ABA型嵌段共聚物(分子量在2×10~3-8×10~3之间),三种是无规共聚的超商分于(分子量约为2×10~6)。结果表明,在水相中有46％NaNO_3时,成膜分子中的聚氧乙烯(EO)链将以一部分留在界面上其众部分伸入水中的方式取向;π越大,挤入水面下的EO链节越多。聚氧丙烯(PO)链的情形也相似,但远不如EO链那样易于挤离水面。根据这一模型,并假定EO链和PO链的行为是相互独立的,即可将Triton型表面活性剂和聚丙二醇的表面膜的实验结果定量地与Pluronic共聚物和超高分子无规共聚物的表面膜性质联系起来。但当基底水相中无盐时,成膜分于的EO链极易进入水相,而且很可能拖带一部分PO链伸进水相;也就是说,这时EO链和PO链的行为不再是相互独立的了,这可以解释实验的结果。
The π-A relationship between the surface films of six ethylene oxide propylene oxide copolyols on water was determined. Three of them were Plaronie series ABA block copolymers (molecular weights of 2 × 10 -3 to 8 × 10 ~ 3), three are random copolymerization super-sub-points (molecular weight of about 2 × 10 ~ 6). The results show that when 46% NaNO_3 is present in the aqueous phase, the polyoxyethylene (EO) chains in the film-forming molecules will orient themselves in such a way that part of the polyoxyethylene (EO) chains remaining in the interface extend into the water; EO chain more. The case of polyoxypropylene (PO) chains is also similar, but far less prone to being squeezed out of the water than the EO chains. Based on this model and assuming that the behavior of the EO chain and the PO chain are independent of each other, the experimental results of the surface films of Triton-type surfactants and polypropylene glycol can be quantitatively correlated with the Pluronic copolymer and the ultra-high molecular random copolymer The surface of the film properties linked. However, when there is no salt in the aqueous phase of the substrate, the EO chains deposited into the membrane can easily enter the water phase and most likely drag a portion of the PO chains into the water phase; that is, the EO chain and PO chain no longer behave then Are independent of each other, which can explain the experimental results.