Measurement of the unperturbed dimensions of stereoregular poly(methyl methacrylate)

Jenkins, Robert F.; Porter, Roger S.

doi:10.1016/0032-3861(82)90023-4

Cited by 34 publications

(18 citation statements)

References 8 publications

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“…Separations were affected and samples were prepared as described above. Molecular weight and polydispersity values were obtained with a literature d n /d c value of 0.084 for syndiotactic PMMA …”

Section: Methodsmentioning

confidence: 99%

“Link-Functionalized” Polymers: An Unusual Macromolecular Architecture through Bifunctional Initiation

Boffa

Novak

1997

Macromolecules

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Bimetallic complexes of the type (C5Me5)2Sm−R−Sm(C5Me5)2 were used for the living bis-initiated polymerization of methyl methacrylate and ε-caprolactone, giving polymers with discrete functionalities at the center of the backbone (“link-functionalized”). Poly(methyl methacrylate) containing olefin units was prepared from [(C5Me5)2Sm]2(μ-η3-CH2CHCH−)2 and related allyl compounds, although slow and/or inefficient initiation of polymerization is observed for complexes in which R is a bulky, heteroatom, or coordinating group. In contrast, the polymerization of ε-caprolactone may be carried out with good control in the presence of both sterically hindering and electron-rich moieties. Polylactones incorporating aromatic, cumulene, and amine/imine groups were synthesized through one-step bimetallic initiation in this manner. Differences between lanthanide(III) methacrylate and lactone polymerizations, differences between lanthanide(III) and aluminum(III) lactone polymerizations, and the presence of transesterification in the lactone system are discussed.

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Section: Methodsmentioning

confidence: 99%

“Link-Functionalized” Polymers: An Unusual Macromolecular Architecture through Bifunctional Initiation

Boffa

Novak

1997

Macromolecules

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“…where l is the length of a monomer segment and M w is the weight average molecular weight of the polymer. The C ϱ value for iPMMA is about 30% greater than that for sPMMA; 52,53 thus, the recess of the iPMMA front should be expected to be faster than that of sPMMA. The effect of PMMA tacticity on the rate of dissolution is illustrated by the case of acetic acid.…”

Section: Resultsmentioning

confidence: 97%

Fourier Transform Infrared Imaging of Stereoregular Poly(Methyl Methacrylate) Dissolution

Bobiak

Koenig

2004

Appl Spectrosc

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Fourier transform infrared (FT-IR) imaging was used to study dissolution of stereoregular poly(methyl methacrylate) (PMMA) films in toluene, benzene, chloroform, acetic acid, and 2-ethoxyethanol. Images of the polymer-solvent interface showed that syndiotactic (sPMMA), atactic (aPMMA), and isotactic (iPMMA) samples dissolved in acetic acid and chloroform; only iPMMA dissolved in benzene, toluene, and 2-ethoxyethanol. Concentration profiles allowed quantitative comparison of each polymer-solvent system. In the cases of chloroform and acetic acid, the rate of polymer dissolution increased with increasing isotacticity. Dissolution of PMMA in chloroform was observed to coincide with development of strong polymer-solvent interactions. The results of systems containing toluene, benzene, and 2-ethoxyethanol reflect kinetic effects on dissolution, including solvent size and stiffness of the polymer backbone.

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“…Based on the rotational isomeric state theory, the unperturbed dimensions of the polymers can be influenced by their stereoregularity . Although the influence is not universal for all types of polymers, either experimentally or theoretically, its role on polymethacrylates is well studied, which can give us hints on polyacrylates with similar structures . Lower amounts of isotactic diads leads to reduced intrinsic viscosities and smaller unperturbed dimensions.…”

Section: Resultsmentioning

confidence: 99%

“…19 Although the influence is not universal for all types of polymers, either experimentally or theoretically, 20 its role on polymethacrylates is well studied, which can give us hints on polyacrylates with similar structures. 21 Lower amounts of isotactic diads leads to reduced intrinsic viscosities and smaller unperturbed dimensions. The flexibility of the polymer chain will thus vary with tacticity.…”

Section: Molecular Characterization Of Padamentioning

confidence: 99%

Solution properties, unperturbed dimensions, and chain flexibility of poly(1‐adamantyl acrylate)

Yin

Osa

et al. 2017

J Polym Sci B Polym Phys

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Poly(1‐adamantyl acrylate) (PAdA) exhibits much higher glass transition and degradation temperatures than other polyacrylates. However, the quantitative evaluation of the stiffness of this polymer chain has not been reported previously. In this study, the dilute solution properties and conformational characteristics of PAdA were evaluated using viscometry and scattering techniques. The unperturbed dimensions of this polymer were evaluated using the Burchard–Stockmayer–Fixman extrapolation and the touched‐bead wormlike chain model. The PAdA chain has a comparable persistence length, diameter per bead and characteristic ratio to poly(methyl methacrylate) and polystyrene. All these results indicate that PAdA is less flexible than common polyacrylates. In addition, the second virial coefficients (A2) of PAdA in different solvents obtained by static light scattering were compared. Among the solvents investigated, tetrahydrofuran is a moderate solvent. Radius of gyration of a polymer sample in the various solvents ranged from 16.8 to 30.3 nm. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017, 55, 1526–1531

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Measurement of the unperturbed dimensions of stereoregular poly(methyl methacrylate)

Cited by 34 publications

References 8 publications

“Link-Functionalized” Polymers: An Unusual Macromolecular Architecture through Bifunctional Initiation

“Link-Functionalized” Polymers: An Unusual Macromolecular Architecture through Bifunctional Initiation

Fourier Transform Infrared Imaging of Stereoregular Poly(Methyl Methacrylate) Dissolution

Solution properties, unperturbed dimensions, and chain flexibility of poly(1‐adamantyl acrylate)

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