Determination of stabilisers in polymeric materials used as encapsulants in photovoltaic modules

2014 ◽  
Vol 33 ◽  
pp. 172-178 ◽  
Author(s):  
Ingrid Hintersteiner ◽  
Lucas Sternbauer ◽  
Susanne Beissmann ◽  
Wolfgang W. Buchberger ◽  
Gernot M. Wallner
Keyword(s):  
Polymeric Materials ◽  
Photovoltaic Modules ◽  
Materials Used

Development of a resistivity standard for polymeric materials used in photovoltaic modules

2015 ◽  
Author(s):  
Michael D. Kempe ◽  
David C. Miller ◽  
Dylan L. Nobles ◽  
Keiichiro Sakurai ◽  
John Tucker ◽  
...  
Keyword(s):  
Polymeric Materials ◽  
Photovoltaic Modules ◽  
Materials Used

Determination of zinc in cassava based polymeric materials

2021 ◽  
pp. 089270572110138
Author(s):  
Rada-Mendoza Maite ◽  
Chito-Trujillo Diana ◽  
Hoyos-Saavedra Olga Lucía ◽  
Arciniegas-Herrera Jose Luis ◽  
Molano-Tobar Nancy Janneth
Keyword(s):  
Food Packaging ◽  
Raw Materials ◽  
Polymeric Materials ◽  
Statistical Parameters ◽  
Intermediate Precision ◽  
Flexible Films ◽  
Flame Atomic Absorption ◽  
Zinc Concentrations ◽  
Materials Used

The current trends in biodegradable food packaging include the use of materials such as biopolymers which should be free of toxic metals to ensure their quality and use in multiple applications. However, these samples can contain zinc given its presence in the materials used to make them. In this study, a method to determine the concentration of zinc (Zn) in thermoformed and biodegradable flexible films samples based on Cassava and in their raw materials (flour, starch and fique) using flame-atomic absorption spectroscopy is described. Prior, an acid digestion with nitric acid under reflux was required. The method was standardized by means of the evaluation of statistical parameters. The method was sufficiently lineal ( R2 = 0.999) in a working range from 0.1 to 1.0 mg Zn/L with detection and quantification limits of 0.03 and 0.82 mg/L, respectively. The method was found to be precise and accurate, and could therefore be used to measure Zn content at levels well below safe limits.The precision of the method was evaluated using intermediate precision and repeatability which showed coefficients of variation less than 6.7% and 4.7%, respectively. The percentages of recovery ranged from 96.5% to 98.2%. The method was successfully applied for the determination of Zn in the studied biopolymers samples and the results obtained support the method’s suitability for determining the presence of the metal. Zinc concentrations in thermoformed, flexible films and flour were below 2.36, 2.14 and 2.01 mg/L, respectively, indicating that these polymers could be used for food containers.

scholarly journals Gel Point Determination of TEOS-Based Polymeric Materials with Application on Conservation of Cultural Heritage Buildings

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
R. Angulo-Olais ◽  
Juan F. Illescas ◽  
J. Aguilar-Pliego ◽  
C. A. Vargas ◽  
C. Haro-Pérez
Keyword(s):  
Light Scattering ◽  
Dynamic Light Scattering ◽  
Polymeric Materials ◽  
Gel Point ◽  
Noninvasive Technique ◽  
Heritage Buildings ◽  
Oscillatory Rheology ◽  
Materials Used ◽  
Gelling Time

Here we present measurements on the gel time of inorganic-organic materials used for stone preservation by means of rheology and dynamic light scattering. Our hybrid material is composed of tetraethyl orthosilicate (TEOS) and polydimethylsiloxane (PDMS) using a nonionic surfactant (n-octylamine) as a template. Moreover, zinc oxide (ZnO) nanoparticles are dispersed in the medium with the aim of obtaining a nanocomposite with potential biocide properties. In our case, we use the ZnO particles as tracers to infer from their scattered intensity mechanical information of the suspending medium. We have found that dynamic light scattering experiments provide similar information on the gelling time, about 30 hours, to that obtained from rotational rheology and oscillatory rheology. This result confirms the validity of light scattering, which is a noninvasive technique, to characterize mechanical properties of time evolving hybrid materials through nonperturbative and well-controlled experiments.

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