2004
DOI: 10.1021/ma035583m
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Consequences of Block Number on the Order−Disorder Transition and Viscoelastic Properties of Linear (AB)n Multiblock Copolymers

Abstract: The effect of block number on the order-disorder transition (ODT) and viscoelastic properties were studied for linear (AB)n multiblock copolymers. A series of symmetric poly(styrene-b-isoprene)n multiblocks ((SI)n, n ) 1-10) were synthesized by anionic polymerization, and their order-disorder transition temperatures (TODT) were located using dynamic mechanical spectroscopy. As n increases, TODT approaches an asymptotic value, consistent with random phase approximation calculations. A systematic difference betw… Show more

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Cited by 107 publications
(135 citation statements)
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“…The effect of architecture on the T ODT has been discussed by Wu and co-workers in their work on symmetric multiblock copolymers. 42 Using a generalized random phase approximation (RPA) theory, they determined that for symmetric multiblock copolymers T ODT should increase with increasing n′ but asymptotically approaches a limiting value for n′ ≫ 1, which was verified experimentally. (Here, the notation n′ is used instead of ⟨n′⟩ to emphasize that the materials in the previous study had a precise number of blocks per sample.)…”
Section: Macromoleculesmentioning
confidence: 90%
“…The effect of architecture on the T ODT has been discussed by Wu and co-workers in their work on symmetric multiblock copolymers. 42 Using a generalized random phase approximation (RPA) theory, they determined that for symmetric multiblock copolymers T ODT should increase with increasing n′ but asymptotically approaches a limiting value for n′ ≫ 1, which was verified experimentally. (Here, the notation n′ is used instead of ⟨n′⟩ to emphasize that the materials in the previous study had a precise number of blocks per sample.)…”
Section: Macromoleculesmentioning
confidence: 90%
“…The mechanical property of block copolymers depends on the molecular weight and volume fraction of the blocks, and the number of blocks [3,37]. By utilizing the living free-radical polymerization multifunctional macroinitiator technique, molar content of PS chains can be controlled and a series of the multiblock copolymers is easily obtained under synthetically robust condition.…”
Section: Molecular Aggregation States and Mechanical Properties Of Ptmentioning
confidence: 99%
“…26,27 Because the T ODT values of (AB) n multiblock polymers are influenced more by the length of the repeating block than the total molar mass, it is possible to prepare high molar mass materials that are melt-processable by utilizing a multiblock architecture. 26 Olseń and co-workers established that the inclusion of ε-decalactone significantly increases the thermal stability of PDL containing block and statistical copolymers relative to PLLA. They demonstrated that PDL and PLLA are sufficiently immiscible for an ABA triblock (comprised of PLLA and PDL blocks of 20 and 40 kg mol −1 , respectively) to microphase separate.…”
Section: ■ Introductionmentioning
confidence: 99%