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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..

Оборудование:
Kinexus lab+
Дата:
April 27 2017
Язык:
English
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Analysis of plasmid DNA using SEC Практическая аннотация

In the biopharmaceutical industry, plasmid DNA is used as both a raw material and active ingredient in vaccines. The TDA detector provides information which cannot be obtained by techniques such MS due to the large size of the plasmids

Оборудование:
Viscotek TDAmax
Дата:
September 30 2009
Язык:
English
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Backbone modification - polymer structure analysis Практическая аннотация

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

Оборудование:
Серия Viscotek
Дата:
September 30 2009
Язык:
English
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Characterization of Colloidal Gold Using Dynamic Light Scattering Практическая аннотация

Colloidal gold is used in molecular recognition and targeting, electronics and nanotechnology. The appearance of the sample is determined by the size and shape of the gold nanoparticles present. Sizes less than 5 nm are yellowish in color, 5 nm to 20 nm tend to be reddish whereas particles greater than 100 nm are bluish in appearance. Size characterization of colloidal gold is of great importance in order to ensure that the particles are homogenous in diameter and that there are no aggregates present in the dispersion. This is popularly done using electron microscopy techniques, however Dynamic Light Scattering is an excellent technique for rapid characterization determining both the size and detecting the presence of aggregates in solution. The technique is also routinely used for sizing of colloidal silver and other metal colloids.

Оборудование:
Серия Zetasizer Nano
Дата:
November 4 2010
Язык:
English
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Characterization of Human Serum Albumin using the Viscotek TDAmax Практическая аннотация

The Viscotek TDAmax is a complete multi-detector SEC/GPC system, ideal for the characterization of multi-component protein and polymer systems. The multiple detectors enable the identification of each component without column calibration

Оборудование:
Серия Viscotek
Дата:
November 4 2010
Язык:
English
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