Melting Transitions of Block Copolymers

The chemical structure of block copolymers is given by the number of blocks, their sequence, and their length, as is discussed in Fig. 1.19 and Sect. 3.4.1. The structure of a diblock copolymer poly(styrene-fc/oc -l, 4-butadiene) of type AB, for example, can have the following chemical structure  

A microphase structure as shown in Fig. 5.79 is sufficiently large to allow molecular mobility within the different lamellae which is hindered only close to the interfaces. The glass transitions of such block copolymers are described in Sect. 7.3. Depending on the nature of the segment, crystallization is possible within the lamellar superstracture. Depending on the space available, the typically nanometer-size crystals, described in Sect. 5.2 are unaffected and experience no restriction. 

Transmission Electron Micrograph of Poly(oxyethylene-Woc/f-styrene) from 6olution 

Block Copolymer of 6hort Sec uences of Amide arid Ether Components 

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