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Polycaprolactone (PCL) is a synthetic polymer that has recently received increasing attention thanks to its biodegradability. Its most common use is in the manufacture of polyurethanes or as a plasticizer for other polymers such as PVC. It is also often used in molding and prototyping thanks to its low melting temperature and is used as a feedstock in some additive manufacturing (3D printing) systems. Finally, it is also used in some drug delivery applications as a control release mechanism, in the same way as polylactic acid (PLA) or polylactic-co-glycolic acid (PLGA). A potential advantage over PLA and PLGA is that PCL has a slower degradation rate and therefore may allow for slower drug release.. As with all polymers, PCL’s molecular properties (e.g. molecular weight) will strongly affect its bulk properties such as strength, toughness, and melt-flow. Being biodegradable, PCL is at a high risk of degradation during processes such as extrusion for molding, particularly at high temperatures. Some mechanisms have been described in the literature to reduce this. For instance, extrusion in the presence of carbon dioxide (CO2) can reduce the melt flow viscosity of PCL by acting as a ‘molecular lubricant’. Decreasing the viscosity of the polymer reduces the temperature at which extrusion can be performed and could thereby protect the polymer from degradation during the process [1].. In this application note, a commercially available sample of PCL was extruded alone and in the presence of CO2­. Multi-detector GPC measurements were made of the virgin sample before and after extrusion, while rotational rheometry was used to study the polymer’s melt viscosity..

Produkte:
Kinexus lab+
Datum:
April 27 2017
Sprache:
English
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The Zetasizer Nano ZS can measure the size, MW, the second virial coefficient and the zeta potential of macromolecules such as antibodies. The light scattering technology used is ideal for the characterization of the antibody fragment (Fab).

Produkte:
Zetasizer Nano Linie
Datum:
October 9 2003
Sprache:
English
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In this note we analyze two hyperbranched polyesters samples by advanced size exclusion chromatography to assess the branching. We show that even for low dn/dc samples of hyperbranched polyesters the results are reproducible

Produkte:
Viscotek Linie
Datum:
September 30 2009
Sprache:
English
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The triple detector size exclusion chromatography system is ideal for polymer structure analysis because it directly detects changes in polymer structure as well as molecular weight, whereas conventional methods detect only differences in size

Produkte:
Viscotek Linie
Datum:
September 30 2009
Sprache:
English
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The Viscotek Dilute Solution Viscosity (DSV) system provides fully automated determination of the viscosity of polyethylene terephthalate (PET) resins, with safety, precision, and accuracy

Produkte:
Viscotek Linie
Datum:
September 30 2009
Sprache:
English
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This application note shows how two modified starch samples with essentially the same molecular size in solution can be differentiated and characterized by triple detection size exclusion chromatography

Produkte:
Viscotek Linie
Datum:
September 30 2009
Sprache:
English
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The mouth feel of chocolate is a vital part of consumer enjoyment of the product. While particle size is a recognized component of mouth feel and is used by chocolate manufacturers to control product quality, particle shape is also expected to play a part. In this application note the Malvern Panalytical Morphologi® automated image analysis system is used to characterize three different chocolate brands for particle shape as well as particle size..

Produkte:
Morphologi 4
Datum:
November 4 2010
Sprache:
English
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Zeta potential is shown to be linked to dispersion stability in apolar media, and can be used to improve stability, and hence improve dosing reproducibility. Control of water in the formulation is important in determining the zeta potential

Produkte:
Zetasizer Nano Linie
Datum:
November 4 2010
Sprache:
English
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A Zetasizer Nano ZS is demonstrated to make automated measurement of zeta potential as a function of pH for a starburst dendrimer, showing the existence of titratable amino groups at low pH. Dendrimers are densely branched, treelike, star-shaped macromolecules with potential for drug delivery, encapsulation, and gene delivery applications. The pH behavior of the effective charge of the polymer is of interest in the design for delivery complexes, and is shown here for a generation 6.5 amidoamin dendrimer with temrinal carboxylate groups.The isoelectric point was found to be at pH 5.8 suing 100mM NaOH and 100mM HCl as titrants.

Produkte:
Zetasizer Nano Linie
Datum:
November 4 2010
Sprache:
English
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Automated time trend measurements using the Zetasizer Nano demonstrate the size change of a polymerising protein, and the accurate and rapid temperature trend characterizes the phase transition temperature of an isopropylacrylamide polymer

Produkte:
Zetasizer Nano Linie
Datum:
November 4 2010
Sprache:
English
Mehr Details

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