Networks Bound Together by Secondary Attractive Forces at Widely Separated Points

Networks Bound Together by Secondary Attractive Forces at Widely Separated Points 

The presence of loci of strong secondary forces of attraction at widely spaced points along threadlike molecules might be expected to result in gelation association of the loci would produce a network very similar to those described above, except that the cross-links, instead of permanent, would be dissociable. 

and Baker (1942) described the gelation of partly deesterified pectin by calcium ions. Here combination of the cation with ionized carboxyl groups on two pectin molecules evidently results in linkage and eventual network formation. The bond is partly electrostatic, but there may be specific complex formation as well, as indicated 

Schematic diagram of the association of segments of a long linear molecule in very dilute (a) and in moderately concentrated solution ( ). 

Networks Bound Together by Nonlocaiieed Secondary Attractive Forces 

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