Monomer residues along polymer chain

Distribution of Monomer Residues along the Polymer Chain... 

Studies of the crystal structure of the polymerized monolayers were undertaken using electron diffraction data.( ) The kinematic approximation could bemade, since a monolayer crystal contained only 1/2 the a-axis repeat of the normal structure of both the monomer and the polymer. The monomer structure is monoclinic with a 33° tilt of the hydrocarbon side chains (a-axis) from the be plane towards the b-axis. Thus c is the unique axis and the monolayer is 31A thick (a-axis 62A). A complete structure of the polymqr has been performed. Jhe unit ce l was orthorhqmbic with a = 70A (monolayer thickness 35A) b = 8.11A and c = 4.89A (chain axis). The monolayer contains 2 monomer repeats in 2 chains (unit cell contains 4 monomer repeats in 4 chains) related by a glide along the b-axis. The final residual was 9% indicating an excellent fit between calculated and observed intensities. 

Monomer arrangement in copolymers In a copolymer, the different types of monomers are distributed along the backbone in a number of ways. In a random copolymer the monomers distribute irregularly, while an alternating copolymer possesses regularly alternating monomer residues. Block copolymers have two or more homopolymer subunits linked by covalent bonds, while graft copolymers contain side chains attached to the main polymer chains. 

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