Lipatov Yuri, Chornaya Valentine, Menzheres Galina, Todosijchuk Tamara
Institute of Macromolecular Chemistry, National Academy of Sciences of Ukraine, 48 Kharkov Shaussee, Kiev 02160, Ukraine.
J Colloid Interface Sci. 2004 Apr 15;272(2):281-7. doi: 10.1016/j.jcis.2003.11.036.
Adsorption of poly(butyl methacrylate) and polystyrene on aerosil from dilute, semidilute, and concentrated solutions has been studied. Using IR spectroscopy the shifts in the position of bands responsible for the vibration of free and bound OH-groups were found. According to the method proposed by Kiselev, the energies of adsorption interaction Q between OH-groups of adsorbent and polymer functional groups were calculated. The heats of adsorption were calculated as the product Q by p (p is the fraction of the bound segments). For the first time for the adsorption from the polymer mixtures, the adsorption heats were measured simultaneously separately for each polymer component and under dilute and concentrated regimes of solutions. It was established that the heats of adsorption of polymers and their mixtures from dilute, semidilute, and concentrated solutions are dependent on the values of adsorption and on the fraction of the bound segments. Increasing adsorption in the dilute solutions brings about the diminishing of the fraction of the bound segments which determine the adsorption heat. The adsorption heats from the mixed systems are lower as compared to adsorption heats from binary solutions.
研究了聚甲基丙烯酸丁酯和聚苯乙烯在稀溶液、半稀溶液和浓溶液中在气相二氧化硅上的吸附情况。利用红外光谱法，发现了负责游离和结合OH基团振动的谱带位置的位移。根据基斯列夫提出的方法，计算了吸附剂的OH基团与聚合物官能团之间的吸附相互作用能Q。吸附热计算为Q与p的乘积（p是结合链段的分数）。首次针对从聚合物混合物中的吸附，分别在稀溶液和浓溶液状态下，同时对每种聚合物组分测量吸附热。结果表明，聚合物及其混合物在稀溶液、半稀溶液和浓溶液中的吸附热取决于吸附值和结合链段的分数。稀溶液中吸附的增加导致决定吸附热的结合链段分数的减少。与二元溶液的吸附热相比，混合体系的吸附热更低。
