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The degradation mechanisms of two different polymers were studied using multi-detector GPC and capillary rheology. While polystyrene was observed to degrade through polymer chain scision, PMMA was seen to aggregate through cross-linking.

자세한 내용은

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..

제품:
Kinexus lab+
Date:
April 27 2017
언어:
English
자세한 내용은

This application note describes how temperature trend measurements on the Zetasizer Nano ZS can be used to determine the aggregation point of a series of proteins

제품:
Zetasizer Nano 시리즈
Date:
October 9 2003
언어:
English
자세한 내용은

The critical strength and curing properties of cement are dependent on the particle size distribution of the cement components. This note describes how laser diffraction can be used as a routine method for cement particle size analysis.

제품:
Mastersizer 시리즈
Date:
June 24 2009
언어:
English
자세한 내용은

The bio-compatibility of cellulose derivatives make them a popular component in many pharmaceutical applications. Triple detection SEC can help correlate molecular weight and structure with critical functions such as stability and toxicity

제품:
Viscotek 시리즈
Date:
September 30 2009
언어:
English
자세한 내용은

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