Bonding and 1 Molecular Structure

It is obvious that the chemical nature of a polymer is of considerable importance in determining the polymer s properties. Of comparable significance is the way the atoms are arranged geometrically within the individual polymer chains. 

Primary Bonds These are covalent bonds that link monomers and make up the backbone of the polymer. This is also termed the one-dimensional structure, as it can be represented by laying out repeat units in a straight line (which is handy for demonstrations in a book, but hardly representative of the complex three-dimensional structure of polymers, as depicted as a bowl of spaghetti). 

A single polypeptide chain folded into a three-dimensional structure 

Secondary Bonds These are weak bonds between near-neighbor repeat units, covering a range of perhaps 10-20 repeat units. Hydrogen bonds are common here and cause an impact on the formation of coils or zig-zag structures. 

Tertiary Bonds These are weak intramolecular bonds (those between a polymer and itself) between repeat units that are widely separated in the one-dimensional structure (i.e., perhaps an alcohol in the side group of the third repeat unit hydrogen bonds to a carboxylic acid in the 8000th repeat unit). These bonds hold the three-dimensional structure of an individual polymer in place. 

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Explain the bonding and molecular structure of the NF3 molecule by using electron dot representation. (7N, gF)... 

Linus Pauling United States chemical bonding and molecular structure of proteins... 

Meng, Z., Dolle, A., and Carper, W. R, Gas phase model of an ionic liquid Semi-empirical and ab initio bonding and molecular structure, J. Molec. Struct. (THEOCHEM), 585, 119-128, 2002. 

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