A general intrinsic viscosity-molecular weights relationship for polydisperse polymers

Manaresi, P.; Munari, Andrea; Pilati, Francesco; Marianucci, Elisabetta

doi:10.1016/0014-3057(88)90052-3

Cited by 18 publications

(7 citation statements)

References 12 publications

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“…7,9 Viscometric constants for chitosan have been reported in various solvents. 5,10 -18 In most reports, various average-molecular weights (M n , M w , and M z ) other than M v were substituted in eq 1 ignoring polydispersity effects.…”

Section: Introductionmentioning

confidence: 99%

Intrinsic viscosity-molecular weight relationship for chitosan

Kasaai

Arul

Charlet

2000

J. Polym. Sci. B Polym. Phys.

299

180

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Section: Introductionmentioning

confidence: 99%

Intrinsic viscosity-molecular weight relationship for chitosan

Kasaai

Arul

Charlet

2000

J. Polym. Sci. B Polym. Phys.

299

180

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“…M v always takes up values in between M n and M w . 45,48,49 The distribution of molar masses can be depicted as in Figure S2 in the Supporting Information.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

Macroscopic Viscosity of Polymer Solutions from the Nanoscale Analysis

Agasty

Wiśniewska

Kalwarczyk

et al. 2021

ACS Appl. Polym. Mater.

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The effective viscosity in polymer solutions probed by diffusion of nanoparticles depends on their size. It is a well-defined function of the probe size, the radius of gyration, mesh size (correlation length), activation energy, and its parameters. As the nanoparticle’s size exceeds the radius of gyration of polymer coils, the effective viscosity approaches its macroscopic limiting value. Here, we apply the equation for effective viscosity in the macroscopic limit to the following polymer solutions: hydroxypropyl cellulose (HPC) in water, polymethylmethacrylate (PMMA) in toluene, and polyacrylonitrile (PAN) in dimethyl sulfoxide (DMSO). We compare them with previous data for PEG/PEO in water and PDMS in ethyl acetate. We determine polymer parameters from the measurements of the macroscopic viscosity in a wide range of average polymer molecular weights (24–300 kg/mol), temperatures (283–303 K), and concentrations (0.005–1.000 g/cm3). In addition, the polydispersity of polymers is taken into account in the appropriate molecular weight averaging functions. We provide the model applicable for the study of nanoscale probe diffusion in polymer solutions and macroscopic characterization of different polymer materials via rheological measurements.

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“…Alternatively, the value of q MHS can be calculated using numerical method and other average molecular weights ( M n , M w , M z ), according to15–17: where b and c are empirical polynomial functions of MHS exponent a . Constant c depends only on a according to17–19: Constant b depends on a and ( M z / M w )17: where constants k 1 , k 2 , and k 3 depend on a through the following least‐square polynomials: …”

Section: Methodsmentioning

confidence: 99%

Differentiation and behavior of human neural progenitors on micropatterned substrates and in the developing retina

Blong

Jeon

Yeo

et al. 2009

J of Neuroscience Research

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In this study we investigated the differentiation of human neural progenitor cells (hNPCs) in vitro to evaluate their differentiation potential and in vivo to explore their viability and behavior following transplantation. Progenitors were maintained as neurospheres in media containing basic fibroblast growth factor and epidermal growth factor. Micropatterned polystyrene substrates were fabricated and coated with ECL (entactin, collagen, and laminin) to provide physical and chemical guidance during the differentiation of the hNPCs. The hNPCs growing on the micropatterned substrates showed no differences in proliferation or differentiation potential compared with those hNPCs growing on the nonpatterned substrates. However, hNPCs cultured on the micropatterned substrates were aligned in the direction of the micropattern compared with those cells growing on the nonpatterned substrates. Furthermore, hNPC migration was directed in alignment with the micropatterned substrates. Transplantation of the hNPCs into the developing retina was used to evaluate their behavior in vivo. Cells displayed extensive survival, differentiation, and morphological integration following xenotransplant into the retina, even in the absence of immunosuppression. Taken together, our results show that these multipotent hNPCs are a neurogenic progenitor population that can be maintained in culture for extended periods. Although the micropatterned substrates have no major effect on the proliferation or differentiation of the hNPCs, they clearly promoted alignment and directed neurite outgrowth along the pattern as well as directing migration of the cells. These approaches may provide important strategies to guide the growth and differentiation of NPCs in vitro and in vivo.

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A general intrinsic viscosity-molecular weights relationship for polydisperse polymers

Cited by 18 publications

References 12 publications

Intrinsic viscosity-molecular weight relationship for chitosan

Intrinsic viscosity-molecular weight relationship for chitosan

Macroscopic Viscosity of Polymer Solutions from the Nanoscale Analysis

Differentiation and behavior of human neural progenitors on micropatterned substrates and in the developing retina

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