Elastic coherent scattering from multicomponent systems. Application to homopolymer mixtures and copolymers

Benoît, H.; Wu, Wen‐Li; Benmouna, M.; Mozer, B.; Bauer, Barry J.; Lapp, Alain

doi:10.1021/ma00147a030

Cited by 81 publications

(38 citation statements)

References 5 publications

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“…Solutions A/B/o~fl/S have five components and thus form a 4 x 4 matrix: 2). The fluctuations of these solutions and of solutions A/B/afl/S are calculated below in mean field approximation [17,18]. An Ornstein-Zernicke type of derivation [17,19] will be presented in a later paper.…”

Section: Theorymentioning

confidence: 99%

“…The fluctuations of these solutions and of solutions A/B/afl/S are calculated below in mean field approximation [17,18]. An Ornstein-Zernicke type of derivation [17,19] will be presented in a later paper. The concentration fluctuations 3 r (q) in liquid n component systems are characterized in wave-vector (q) space by structure factors…”

Section: Theorymentioning

confidence: 99%

“…This leaves the three structure factors (1 -Z (So + 2Sb -$2b/2)) 1 + (2 ~ + X) (2Sc + S2b ) s as (18) which leads with the Eqs. (16,17) to the critical conditions…”

Section: Mabsmentioning

confidence: 99%

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Interface stabilization and micelle formation in blends with a block copolymer

Löwenhaupt

Hellmann

1990

Colloid & Polymer Sci

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The phase separation behavior of ternary blends of two homopolymers, PMMA and PS, and a block copolymer of styrene and methylmethacrylate, P(S-b-MMA), was studied. The homopolymers were of equal chain length and were kept at equal amounts. Two copolymers were used with blocks of equal length, which exceeded or equaled that of the homopolymer chains. Varied was the copolymer content f. Films were cast from toluene, which is a nonselective solvent. The morphologies of the cast films were compared with the structure of the critical fluctuations in solution, which were calculated in mean field approximation. The axis of blend compositions f can be divided into parts of dominating macrophase and microphase separation. Above a transition concentration fo, all copolymer chains are found in phase interfaces. Below fo, part of them form micelles within the homopolymer phases.

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Section: Theorymentioning

confidence: 99%

Section: Theorymentioning

confidence: 99%

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Interface stabilization and micelle formation in blends with a block copolymer

Löwenhaupt

Hellmann

1990

Colloid & Polymer Sci

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“…This represents a truly athermal interaction between the compatibilizer components and the blend components. It is known [10] that the interaction parameter X ps-pMMA is positive but small, so that blends have borderline miscibility. This makes the blends hard to characterize, since the blank mixture containing no compatibilizer already has a fine dispersion.…”

Section: Melt Mixing Resultsmentioning

confidence: 99%

Compatibilizers made from Copolymers that Exhibit Strong Interactions

Bauer

Liu

1996

MRS Proc.

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Random copolymers of poly(methyl methacrylate-d8) (PMMA) and poly(methacrylic acid) (PMAA) were synthesized and blended with polyethylene oxide (PEO), and SANS was used to estimate the strength of interaction between the various polymer pairs. The addition of PMAA greatly reduced the scattering of the blend, giving a large negative Flory-Huggins interaction parameter. Copolymers of the type PMAA-g-PS, PMAA-r-PS, PMMA-g-PS, and PMMA-r-PS (g = graft, r = random) were used as compatibilizers for the melt blending of mixtures containing 80% PS and 20% PEO. Random copolymers containing half PMMA and half PS or half PMAA and half PS were ineffective compatibilizers while graft copolymers of these polymers produced a much finer dispersion of PEO in PS when blended at 190'C. Graft copolymers made with 90% PS were different, however, with PMMA grafts having only a small effect, while PMAA grafts having a large effect. Random and graft copolymers of PS and PMMA were also used to compatibilize blends of PS and PMMA. The results were similar to the same compatibilizers with blends of PS and PEO, with the graft copolymer causing a finer dispersion.

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“…[4,[23][24][25][26][27][28][29][30][31][32] The reason is that the last mentioned bulk system shows a relatively small temperature dependence of Flory-Huggins x parameter [24,25] and a high glass transition temperature T g , thus making an experimentally inconvenient system. [33] …”

Section: Full Papermentioning

confidence: 99%

Self‐Assembled Structures in Block Copolymer Blends: SAXS, SANS and TEM Study

Holoubek

Baldrián

Lal

2007

Macro Chemistry & Physics

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Phenomena associated with the order‐disorder transition, microdomain morphology and phase behavior of a deuterated block copolymer (BCP) blend I/II (where I is dPS‐block‐dPMMA and II is dPS‐block‐PI) were studied by SAXS, SANS and TEM. The studied, almost symmetric, copolymers differ essentially in microdomain morphology. One of them (I) is in disordered microdomain state, while the other (II) displays lamellar morphology at ordinary temperatures. Self‐assembled structures in blends were investigated as a function of concentration of the added microphase‐separated copolymer and temperature. The ODT positions were located in all the blends, the position of ODT depending only slightly on the concentration of the ordered copolymer. A systematic increase in long period D of the lamellar phase is observed with the growing content of the disordered copolymer. The evaluation of TEM shows the gradual diminishing of macrophase separated regions of disordered copolymer I with growing content of the lamellar copolymer II.magnified image

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Elastic coherent scattering from multicomponent systems. Application to homopolymer mixtures and copolymers

Cited by 81 publications

References 5 publications

Interface stabilization and micelle formation in blends with a block copolymer

Interface stabilization and micelle formation in blends with a block copolymer

Compatibilizers made from Copolymers that Exhibit Strong Interactions

Self‐Assembled Structures in Block Copolymer Blends: SAXS, SANS and TEM Study

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