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Microphase-separated poly(styrene-b-isoprene)n multiblock copolymers with constant block lengths
- Source :
- Polymer. 35:4527-4536
- Publication Year :
- 1994
- Publisher :
- Elsevier BV, 1994.
-
Abstract
- Linear multiblock copolymers, like their diblock analogues, are capable of ordering into periodic microstructures when the blocks are sufficiently incompatible. In this work, a series of four linear poly(styrene-b-isoprene)n (SI)n (1 ≤ n ≤ 4) multiblock copolymers with nearly equal block lengths has been synthesized via living sequential anionic polymerization. All of the copolymers are microphase-separated, as discerned by transmission electron microscopy (TEM) and small-angle X-ray scattering (SAXS), and exhibit lamellar morphologies in which the microdomain periodicity decreases with n. This behaviour suggests that the middle blocks contract the microdomains along the lamellar normal. Microstructural characteristics are compared with predictions from formalisms proposed for linear multiblock copolymers and, along with conformational considerations, are used to interpret the thermal and tensile properties of the copolymers.
- Subjects :
- Materials science
Polymers and Plastics
Small-angle X-ray scattering
Scattering
Organic Chemistry
Styrene
Crystallography
chemistry.chemical_compound
Anionic addition polymerization
chemistry
Transmission electron microscopy
Polymer chemistry
Materials Chemistry
Copolymer
Lamellar structure
Isoprene
Subjects
Details
- ISSN :
- 00323861
- Volume :
- 35
- Database :
- OpenAIRE
- Journal :
- Polymer
- Accession number :
- edsair.doi...........7c23428c52fd71cffd5112e9df89899c