Viscosity model for polydisperse polymer melts

Nichetti, Dario; Manas‐Zloczower, Ica

doi:10.1122/1.550908

Cited by 92 publications

(57 citation statements)

References 32 publications

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“…The increment in zero shear viscosity with the addition of TPU, follows the mixing rule, approximately. In addition, due to shear thinning, all incompatibilized blends depict a slight decrease in the melt viscosity . Incorporation of 1 wt % PDI to the incompatibilized PLA/TPU blends causes pronounced effect on both the magnitude and the frequency dependence of the complex viscosity.…”

Section: Resultsmentioning

confidence: 98%

Reactive compatibilization of PLA/TPU blends with a diisocyanate

Dogan

Reyes

Rastogi

et al. 2013

J of Applied Polymer Sci

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This study focuses on the compatibilization of poly(lactic acid) (PLA)/thermoplastic polyurethane (TPU) blends by using 1,4 phenylene diisocyanate (PDI) for the first time, as the compatibilizer. Because of the potential interactions of diisocyanates with OH/COOH, they are useful for reactive processing of PLA/TPU blends in the melt processing. To have insight on the reactively compatibilized structure of PLA/TPU blends, phase morphologies are observed by means of scanning electron microscopy. The mechanical, thermal, and rheological responses of the blends are investigated. The observations are that the brittle behavior of PLA changes to ductile with the addition of TPUs. The addition of PDI improves the tensile properties of the blends. The compatibilization action of PDI is monitored with DMA and rheological experiments. Cross‐over in the G′ and G″ curves of compatibilized blends indicates the relaxation of branches formed in the presence of PDI. The dispersed phase size of TPU decreases in PLA in the presence of PDI due to the improved compatibility. © 2013 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40251.

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Section: Resultsmentioning

confidence: 98%

Reactive compatibilization of PLA/TPU blends with a diisocyanate

Dogan

Reyes

Rastogi

et al. 2013

J of Applied Polymer Sci

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“…Based on the Eq. 2, the appearance viscosity of PS1 will be 3.45-5.09 3 10 2 Pa s, which is smaller than the Newtonian viscosity of 1.20-102.00 3 10 3 Pa s [59] as Fig. 12.…”

Section: Effects Of Aao-molten Polymer Surface Wettability On Nanofibmentioning

confidence: 88%

One-dimensional polymer nanofiber arrays with high aspect ratio obtained by thermal nanoimprint method

et al. 2016

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Polymer surface modification that mimicks natural behaviors has been a subject of great interest. Fabrication of polymer nanofiber arrays with various applications has been studied intensively. Avoidance of chemical solvents, reduction of processing time, improvement of the nanofiber size distribution and aspect ratios, and improvement of reproducibility have been sought for industrial value creation. This study examines an alternative fabrication methods for polymer nanofiber arrays using a combination of anodic aluminum oxide (AAO) nanoporous template and thermal nanoimprinting lithography for simple, precise processing. Based on those results, nanofiber arrays were fabricated with 40‐µm‐thick film and 50–100 nm fiber diameter polystyrene (PS) and polypropylene (PP). For this study, 50‐nm diameter PS nanofibers with 50 µm maximum length and a maximum aspect ratio of 1,000 were produced in addition to PP nanofibers having 130 µm maximum length and an aspect ratio of 2,600. The nanofiber lengths were affected considerably by molten polymer flow related to imprint processing conditions, polymer properties, AAO properties, and surface wettability between AAO and molten polymers. Moreover, AAO nanoconfinement demonstrated molecular orientation alignment of polymers that affect thermal properties, crystallinity, and mechanical properties of the obtained polymer nanofiber arrays. POLYM. ENG. SCI., 57:214–223, 2017. © 2016 Society of Plastics Engineers

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“…This model has been developed by Colby, Fetters, and Graessley, 26 Malkin and Teishev, 27 Tuminello, 28 and Nichetti and Manas-Zloczower. 29 Zero shear viscosity is related to weight-average molecular weight according to…”

Section: Resultsmentioning

confidence: 99%

Molar Mass and Molecular Weight Distribution Determination Of UHMWPE Synthesized Using a Living Homogeneous Catalyst

Talebi¹,

Duchateau²,

et al. 2010

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Understanding of the physical characteristics of a polymer requires molar mass determination. For the commercially available polymers, having average molar mass below 1 000 000 g/mol, chromatography is the method that is often applied to determine the molar mass and molar mass distribution. However, the application of conventional chromatography techniques for polymers having molar mass >1 000 000 g/mol becomes very challenging, and often the results are disputed. In this article, melt rheometry based on the "modulus model" is utilized to measure the molar mass and polydispersity of ultra highmolecular-weight polyethylenes (UHMWPEs) having molar mass >1 000 000 g/mol. Results are compared with the chromatography data of the same polymer samples and the boundary conditions where the chromatography technique fails, whereas the rheometry provides the desired information is discussed. The rheological method is based on converting the relaxation spectrum from the time domain to the molecular weight domain and then using a regularized integral inversion to recover the molecular weight distribution curve. The method is of relevance in determining very high molar masses (exceeding 3 000 000 g/mol) that cannot be ascertained conclusively with the existing chromatography techniques. For this study, UHMWPEs with various weight-average molar masses, where the number-average molar mass exceeds >1 000 000 g/mol, are synthesized. Catalyst used for the synthesis is a living homogeneous catalyst system: MAO-activated bis(phenoxy imine) titanium dichloride. The rheological behavior of the thus synthesized nascent reactor powders confirms the disentangled state of the polymer that tends to entangle with time in melt.

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Viscosity model for polydisperse polymer melts

Cited by 92 publications

References 32 publications

Reactive compatibilization of PLA/TPU blends with a diisocyanate

Reactive compatibilization of PLA/TPU blends with a diisocyanate

One-dimensional polymer nanofiber arrays with high aspect ratio obtained by thermal nanoimprint method

Molar Mass and Molecular Weight Distribution Determination Of UHMWPE Synthesized Using a Living Homogeneous Catalyst

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