High Temperature GPC with a Single Capillary Viscometer

Lesec, James; Millequant, M.; Havard, Trevor

doi:10.1080/10826079408013384

Cited by 15 publications

(8 citation statements)

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“…To check the GPC system, especially the performance of the viscometric detector and the refractometer "prototype #4", we compared the polystyrene MarkHouwink coefficients obtained using the TSK narrow standards, represented in Figure 9, and the one obtained with a linear broad molecular weight polymer, polystyrene Dow 1683 represented in Figure 10, where interdetector volume correction was applied using the exact interdetector volume. Similar Mark-Houwink exponents a were obtained (0.715 and 0.717), confirming the reliability of this GPC instrument and the parameters used for calibration [9]. …”

Section: Methodssupporting

confidence: 77%

Analysis of Star-Branched Polymers with Triple Detection (Refractive Index, Viscometry, Light Scattering) Gel Permeation Chromatography

Lesec¹,

Millequant

1996

International Journal of Polymer Analysis and Characterization

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This paper deals with the characterization of star-branched model copolymers. The polymer branches are composed of PMMAPtBuA di-block copolymers of poly(methy1 methacrylate) and poly(rert-butylacrylate) with well-controlled chemical composition and structure (very low polydispersity). When these copolymer branches are chemically coupled, they produce star-branched copolymers with various numbers of branches. Number-average molecular weights Mn of stars and branches were used to calculate the number of branches of the starbranched copolymers. In order to determine the real structure of the star-branched copolymers, we have measured the branching parameter g' and tested several hypothesis on the relationship which links the number of branches to the branching parameter g. The value of the exponent of the g/g'relationship. which characterizes the type of branching, was determined at several conditions. Values were dependent on the branching relationship, however, it was not possible to find an exponent value of 0.5, corresponding to pure star-branched molecules. We could not conclude whether or not the technique of multidetection GPC was not accurate enough to obtain this kind of infomation or if the studied star-branched copolymers had a complex structure, more complicated than a simple star. Excellent agreement was found between light scattering values and from viscometry with universal calibration. These results demonstrate excellent performance for universal calibration, even for highly branched polymers with unusual viscometric behavior.

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Section: Methodssupporting

confidence: 77%

Analysis of Star-Branched Polymers with Triple Detection (Refractive Index, Viscometry, Light Scattering) Gel Permeation Chromatography

Lesec¹,

Millequant

1996

International Journal of Polymer Analysis and Characterization

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“…6,10,18,20 This secondary peak was not present in the response of the DRI and VD detectors, which is consistent with earlier on-line viscometer and SEC studies. [3][4][5][6][7]9,10 The difference in response between the LSD and the VD detectors is not surprising because it reflects the difference in sensitivity. The LSD signal is proportional to cM (c, concentration; M, molecular weight), while the VD response is proportional to cM ␣ where ␣ is the Mark-Houwink parameter.…”

Section: Resultsmentioning

confidence: 95%

High molecular weight tail and long-chain branching in SRM 1476 polyethylene

Beer¹,

Capaccio²,

Rose³

1999

J. Appl. Polym. Sci.

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“…Details of the SCV detector, hardware and software, were described elsewhere. 15 The signal of the viscometer detector depends on the intrinsic viscosity and on the concentration of the solution. Hence, to obtain a constant signal-tonoise ratio, the concentration of the samples was calculated so that [] c ϭ 0.1.…”

Section: Viscometrymentioning

confidence: 99%

Dilute-solution properties of a polymeric antitumor drug carrier by size-exclusion chromatography, viscometry, and light scattering

Mendichi

Rizzo

Gigli

et al. 1998

J. Appl. Polym. Sci.

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An investigation is reported on the dilute-solution properties of PNU166945, a conjugate between a synthetic polymeric drug-carrier poly[N-(2-hydroxypropyl)-methacrylamide)] (PHPMA) and the antitumor drug Paclitaxel. Thirteen fractions of the conjugate PNU and six fractions of the polymeric drug-carrier PHPMA were prepared and characterized by size-exclusion chromatography, viscometry, and light scattering. The molar mass distribution, intrinsic viscosity [], and dimensions ͗s 2 ͘ 1/ 2 of each fraction were determined. From M, [], and ͗s 2 ͘ 1/ 2 , the constants of the power laws [] ϭ f(M) and ͗s 2 ͘ 1/ 2 ϭ f(M) were determined. A Stockmayer-Fixman plot was utilized to derive the unperturbed dimensions of the macromolecules. The presence of the drug considerably influences the conformation of the macromolecules. For PHPMA and PNU, respectively, the slopes of the power law [] ϭ f(M) were 0.69 and 0.617, the slopes of the power law ͗s 2 ͘ 1/ 2 ϭ f(M) were 0.55 and 0.48, and the Kuhn statistical segments were 1.7 and 2.1 nm. To our knowledge, this is the first time that an exhaustive molecular characterization of a conjugated polymeric system has been presented.

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High Temperature GPC with a Single Capillary Viscometer

Cited by 15 publications

References 0 publications

Analysis of Star-Branched Polymers with Triple Detection (Refractive Index, Viscometry, Light Scattering) Gel Permeation Chromatography

Analysis of Star-Branched Polymers with Triple Detection (Refractive Index, Viscometry, Light Scattering) Gel Permeation Chromatography

High molecular weight tail and long-chain branching in SRM 1476 polyethylene

Dilute-solution properties of a polymeric antitumor drug carrier by size-exclusion chromatography, viscometry, and light scattering

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