ADSORPTION OF POLYMERS AT SOLUTION-SOLID INTERFACE .I. POLYETHERS ON SILICA
ADSORPTION OF POLYMERS AT SOLUTION-SOLID INTERFACE .I. POLYETHERS ON SILICA
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DOI：
10.1021/j100868a031
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发表时间：
1967-01-01
影响因子：
--
通讯作者：
MCCONNELL, P
中科院分区：
文献类型：
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作者：
HOWARD, GJ;MCCONNELL, P
本文研究了聚合物分子量在390~19万之间的六种溶剂聚氧乙烷在硅胶上的吸附。结果表明，从水中沉积的聚环氧乙烷具有几乎平坦的构象，但从有机液体中吸附时会出现中等程度的环状进入溶液相，相对分子质量较低的聚环氧乙烷似乎比链长较大的聚环氧乙烷更接近表面。吸附的程度强烈地依赖于溶剂，这种方式可以通过考虑聚合物-溶剂相互作用以及聚合物链段和溶剂分子之间对表面位置的竞争来合理化。表面修饰将硅羟基转化为更低极性的基团，从而降低了聚合物的吸附。
A study has been made of the adsorption onto Aerosil silica of poly (ethylene oxide) from six solvents: polymer molecular weights range from 390 to 190,000. The results indicate that poly (ethylene oxide) deposited from water adopts a nearly flat conformation but that moderate looping into the solution phase occurs on adsorption from organic liquids; poly-mers of lower molecular weight appear to lie closer tothe surface than those of greater chain length. The extent of adsorption depends strongly upon the solvent in a manner which can be rationalized by consideration of both the polymer-solvent interaction and the competition between polymer segments and solvent molecules for surface sites. Sur-face modifications which convert silica hydroxyls to less polar groups bring about a reduc-tion in polymeradsorption.