Block copolymers by radical polymerization 3. Block copolymers of styrene, methyl acrylate, n ‐methyl‐ n ‐vinylacetamide, 1‐vinyl‐2‐pyrrolidone
1982; Wiley; Volume: 183; Issue: 7 Linguagem: Inglês
10.1002/macp.1982.021830710
ISSN0025-116X
AutoresPritt Singh Anand, Hans George Stahl, Walter Heitz, Gerhard Weber, Ludwig Bottenbruch,
Tópico(s)Material Properties and Applications
ResumoAbstract A polyazoinitiator obtained from 2,2′‐azoisobutyronitrile (AIBN) and a diol is used to prepare block copolymers according to the Smets procedure. Partial decomposition of the polyazoinitiator in presence of a monomer results in an azogroup‐containing prepolymer. Block copolymers are obtained decomposing the remaining azo groups in presence of a second monomer. Examples investigated are styrene/methyl acrylate, styrene/ N ‐methyl‐ N ‐vinylacetamide, methyl acrylate/ N ‐methyl‐ N ‐vinylacetamide, 1‐vinyl‐2‐pyrrolidone/acrylonitrile. Homopolymers are produced simultaneously. Up to 70% of block copolymers are formed in these reactions. Block copolymers of styrene/methyl acrylate have hard/soft segmented molecules. It is an elastic material with spherical, cylindrical and lamellar, resp. domain structures, depending on the composition.
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