Light scattering study of stereocomplex behaviour in solutions of poly(methyl methacrylate)

Katime, Issa; Quintana, José R.; Valenciano, R.; Strazielle, C.

doi:10.1016/0032-3861(86)90133-3

Cited by 11 publications

(4 citation statements)

References 33 publications

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“…The corresponding dn/dc value for homo-PMMA in acetonitrile is obtained from literature as 0.140 cm 3 /g. 40 The dn/dc values presented are the same as this literature value, and hence the measured apparent molecular weight is close to the true molecular weight.…”

Section: Methodssupporting

confidence: 62%

“…Due to the chemical heterogeneity of block copolymers, the weight-average molecular weight determined in static light scattering measurements is an apparent molecular weight. The corresponding d n /d c value for homo-PMMA in acetonitrile is obtained from literature as 0.140 cm 3 /g . The d n /d c values presented are the same as this literature value, and hence the measured apparent molecular weight is close to the true molecular weight.…”

Section: Methodsmentioning

confidence: 54%

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Characterization of Polyisoprene-b-Poly(methyl methacrylate) Diblock Copolymer Micelles in Acetonitrile

Schillén

Yekta

et al. 1999

J. Phys. Chem. B

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In acetonitrile, polyisoprene-b-poly(methyl methacrylate) (PI-PMMA) diblock copolymers form starlike micelles with a dense core of the insoluble PI blocks and a soft solvent-swollen corona of the soluble PMMA blocks. Static and dynamic light scattering experiments in combination with viscosity measurements show that these micelles behave hydrodynamically as hard spheres. The block copolymers are labeled at the block junction, with a single fluorescent dye, either a donor chromophore (phenanthrene) or an acceptor chromophore (anthracene). These dyes are confined to the interface during self-assembly. Fluorescence energy-transfer experiments on molecularly mixed micelles of donor-and acceptor-labeled copolymers provide a core radius of 7.6 ( 0.8 nm and a number-average aggregation number (N n agg ) of 98 ( 22 under the assumption that the energy transfer takes place on a surface of a sphere. Simulations in terms of a Helfand-Tagami junction distribution profile confirm that the core-corona interface of the PI-PMMA micelles is thin (ca. 0.9 nm) and that almost all of the energy transfer occurs within a narrow interfacial region. From the static light scattering measurements of the mixed micelles a weight-average aggregation number (N w agg ) of 127 ( 6 is obtained. The ratio N w agg /N n agg ) 1.3 agrees with size polydispersity of the micelles obtained from the analysis of dynamic light scattering data. The experimental corona thicknesses are in good agreement with those calculated from expressions describing starlike block copolymer micelles.

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Section: Methodssupporting

confidence: 62%

Section: Methodsmentioning

confidence: 54%

Characterization of Polyisoprene-b-Poly(methyl methacrylate) Diblock Copolymer Micelles in Acetonitrile

Schillén

Yekta

et al. 1999

J. Phys. Chem. B

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“…NMR spectra were recorded with a Bruker Avance II 300: 1 H (300.13MHz), 13 C (74.48 MHz), 19 F (282.40 Mhz) at 298 K in CDCl3. Chemical shifts are expressed in parts per million with residual solvent signals as internal reference ( 1 H and 13 C) 16 or with an external reference (CF3Cl for 19 F). Melting points were determined using a Reichert microscope apparatus and are uncorrected.…”

Section: Methodsmentioning

confidence: 99%

How Can Xanthates Control the RAFT Polymerization of Methacrylates?

Destarac

Matioszek

Vilà

et al. 2018

ACS Symposium Series

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HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers. L'archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d'enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.

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“…Synthetic polymers can be heterogeneous with respect to molar mass, chemical composition, chain architecture, functionality, and tacticity. It has been shown that the tacticity influences the physical properties of poly(methyl methacrylate) (PMMA). − Various techniques have been used to study stereoregular PMMAs. − Stereoregular PMMAs have also been explored as stationary phases in chromatography . The molecular structure of isotactic (mmm), syndiotactic (rrr), and atactic (mrr) PMMA are presented in Figure .…”

mentioning

confidence: 99%

Comprehensive Two-Dimensional Liquid Chromatography of Stereoregular Poly(Methyl Methacrylates) for Tacticity and Molar Mass Analysis

et al. 2013

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For the first time, stereoregular poly(methyl methacrylates) (PMMAs) were separated according to tacticity on a carbon-based stationary phase using solvent gradient interaction chromatography (SGIC). This stationary phase provides superior separation capabilities, enabling the baseline separation of highly isotactic and syndiotactic PMMAs of different molar masses. Two-dimensional liquid chromatography was performed with the SGIC method separating, according to tacticity in the first dimension coupled to size-exclusion chromatography separating according to molar mass in the second dimension, thus providing comprehensive information on both microstructure and molar mass.

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Light scattering study of stereocomplex behaviour in solutions of poly(methyl methacrylate)

Cited by 11 publications

References 33 publications

Characterization of Polyisoprene-b-Poly(methyl methacrylate) Diblock Copolymer Micelles in Acetonitrile

Characterization of Polyisoprene-b-Poly(methyl methacrylate) Diblock Copolymer Micelles in Acetonitrile

How Can Xanthates Control the RAFT Polymerization of Methacrylates?

Comprehensive Two-Dimensional Liquid Chromatography of Stereoregular Poly(Methyl Methacrylates) for Tacticity and Molar Mass Analysis

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