Structure and Melt Rheology of Block Copolymers
The properties o f polymer materials are determined by the molecular structure, the microstructure (morphology etc.), and the macrostructure (geometrical form) o f the materials ( 1).
Block copolymers constitute a set o f molecular structures that open special possibilities for tailor-making polymer materials. A nonexhaustive survey o f ba sic structural factors can be represented schematically as follows:
1. Molecular structure o f block copolymers
Repetition units in the blocks Sequence-length distribution o f the blocks Tacticity-stereospecific structure o f block Number o f blocks per polymer molecule Distribution o f the number o f blocks per polymer molecule Molecular weight distribution Branch structures Deviating repetition units in blocks etc.