Study the Micromechanical Behavior of PLA Film

2013 ◽  
Vol 811 ◽  
pp. 23-27
Author(s):  
L. Douadji ◽  
Fethi Benkhenafou ◽  
Wei Wei Du ◽  
A. Tcharkhtchi ◽  
M. Madani
Keyword(s):  
Mechanical Stress ◽  
Polylactic Acid ◽  
Mechanical Behaviour ◽  
Molar Mass ◽  
Structural Evolution ◽  
Semicrystalline Polymer ◽  
Average Molar Mass ◽  
Small Scales ◽  
Stress Influence

The objective of this work is the study of the mechanical stress influence on the structural evolution. In particular, we studied the initiation and the plasticity mechanisms propagation of a semicrystalline polymer at small scales. The material is polylactic acid (PLA) film with average molar mass of 199 kg/mole and a thickness of 200 μm. The lamellate morphology of this material is very heterogeneous: in given area and packages of different orientation plates, they are spherulites α and β which have a different mechanical behaviour on a lamellate scale.

Inter-laboratory evaluation of SEC-post-column calcofluor for determination of the weight-average molar mass of cereal β-glucan

2015 ◽  
Vol 124 ◽  
pp. 254-264 ◽  
Author(s):  
Anne Rieder ◽  
Svein Halvor Knutsen ◽  
Ann-Sissel T. Ulset ◽  
Bjørn E. Christensen ◽  
Roger Andersson ◽  
...  
Keyword(s):  
Molar Mass ◽  
Laboratory Evaluation ◽  
Average Molar Mass

scholarly journals Determination of the Average Molar Mass of the Vapour Above Molten Sodium Chloride by the Transpiration Method.

1979 ◽  
Vol 33a ◽  
pp. 407-412 ◽  
Author(s):  
Halvor Kvande ◽  
Oldrich Strouf ◽  
Pär Svanström ◽  
Elina Näsäkkälä ◽  
Eberhard Hoyer ◽  
...  
Keyword(s):  
Sodium Chloride ◽  
Molar Mass ◽  
Average Molar Mass ◽  
Molten Sodium ◽  
Transpiration Method

scholarly journals Simulation mechanical stress influence to silicon solar cells by Comsol Multiphysics

2021 ◽  
Vol 10 (2) ◽  
pp. 469-472
Keyword(s):  
Mechanical Properties ◽  
Solar Cells ◽  
Solar Cell ◽  
Mechanical Stress ◽  
Comsol Multiphysics ◽  
Silicon Solar Cells ◽  
Stress Influence

We know the mechanical properties of silicon. However, little is known about the mechanical properties of silicon solar cells. Modeling is widely used in the study of solar cells. This article discusses in detail the effect of mechanical stress on solar cells. To do this, a model of the solar cell was created and simulated at Comsol Multiphysics. The results were presented visually and graphically. The results were tested for relevance and accuracy

The effect of polymer branching and average molar mass on the formation, stabilization and thermoresponsive properties of gold nanohybrids stabilized by poly(N-isopropylacrylamides)

2015 ◽  
Vol 6 (32) ◽  
pp. 5838-5850 ◽  
Author(s):  
Hong Hanh Nguyen ◽  
Annie Brûlet ◽  
Dominique Goudounèche ◽  
Pascale Saint-Aguet ◽  
Nancy Lauth-de Viguerie ◽  
...  
Keyword(s):  
Molar Mass ◽  
Average Molar Mass

The architecture of PNIPAM based polymers strongly influences both their thermoresponsiveness and their abilities to control and stabilize AuNP formation.

scholarly journals Hyaluronic Acid in the Intestinal Tract: Influence of Structure, Rheology, and Mucoadhesion on the Intestinal Uptake in Rats

Biomolecules ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1422
Author(s):  
Alexandro Barbosa de Souza ◽  
Marco Vinícius Chaud ◽  
Thais Francine Alves ◽  
Juliana Ferreira de Souza ◽  
Maria Helena Andrade Santana
Keyword(s):  
Hyaluronic Acid ◽  
Intestinal Tract ◽  
Molar Mass ◽  
Hydrodynamic Diameter ◽  
Average Molar Mass ◽  
Intestinal Membrane ◽  
Mixed Formulations ◽  
Jejunum Segment

Oral hyaluronic acid (HA) is a ubiquitous biopolymer that has gained attention as a treatment for local or systemic diseases. Here, we prepared and characterized structures of free HA (f-HA) with a high (>105 Da), intermediate (≤105 Da), and low (≤104 Da) average molar mass (MM); nanoparticles crosslinked with adipic dihydrazide (n-HA); and mixed formulations (mixed-HA) containing f-HA and n-HA. MM distribution determined the structure, hydrodynamic diameter, and zeta potential of the f-HAs. Crosslinking changed the physicochemical properties in n-HA. In vitro tack adhesion assays, using mucin tablets or a viable rat intestinal mucosa, showed better mucoadhesion with f-HA (intermediate MM) and mixed-HA (25% n-HA), especially in the jejunum segment. High MM f-HA presented negligible mucoadhesion. n-HA showed the deepest diffusion into the porous of the membranes. In vivo results showed that, except for high MM f-HA, there is an inverse relationship between rheological changes in the intestinal membrane macerates resulting from mucoadhesion and the effective intestinal permeability that led to blood clearance of the structures. We conclude that the n-HA formulations are promising for targeting other tissues, while formulations of f-HA (intermediate MM) and mixed-HA are better for treating dysbiosis.

Mechanical Stress Influence on Electronic Transport in Low-$k$ SiOC Dielectric Dual Damascene Capacitor

2013 ◽  
Vol 34 (8) ◽  
pp. 1056-1058 ◽  
Author(s):  
Ya-Liang Yang ◽  
Tai-Fa Young ◽  
Ting-Chang Chang ◽  
Jia-Haw Hsu ◽  
Tsung-Ming Tsai ◽  
...  
Keyword(s):  
Mechanical Stress ◽  
Electronic Transport ◽  
Dual Damascene ◽  
Low K ◽  
Stress Influence

scholarly journals The investigations of bioactive copper(II) complexes with reduced low-molar dextran

2008 ◽  
Vol 22 (2-3) ◽  
pp. 177-185 ◽  
Author(s):  
Milorad Cakić ◽  
Žarko Mitić ◽  
Goran S. Nikolić ◽  
Ljubomir Ilić ◽  
Goran M. Nikolić
Keyword(s):  
Fourier Transform ◽  
Complex Formation ◽  
Room Temperature ◽  
Molar Mass ◽  
Reaction Conditions ◽  
Average Molar Mass ◽  
Square Planar ◽  
Physicochemical Methods ◽  
Fourier Transform Ir ◽  
Aqueous Complexes

The optimization of the reaction conditions (pH,T,t) to obtain stable copper(II) ion complexes with dextran derivatives were investigated in this paper. A complete synthesis of stable aqueous complexes can be realized with reduced low-molar polysaccharides, at an average molar mass 5000 g mol–1and pH 7.5–8. Fourier-transform IR spectra of polysaccharide dextran and its compounds with copper(II) ion, recorded at room temperature, were analyzed in order to obtain the information about the structure and the conformation of these polymer compounds. The ESR parameters of the spectra indicate the square-planar coordination of Cu(II) ion with four O atoms. Copper(II) complex formation with dextran and its derivatives were analyzed by physicochemical methods. Synthesized complexes of Cu(II) ion with reduced low-molar dextran in comparison with commercial preparations showed the considerably lower acute toxicity (LD501705).

scholarly journals Quantification of Polyphenols in Seaweeds: A Case Study of Ulva intestinalis

Antioxidants ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 612 ◽  
Author(s):  
Marie Emilie Wekre ◽  
Karoline Kåsin ◽  
Jarl Underhaug ◽  
Bjarte Holmelid ◽  
Monica Jordheim
Keyword(s):  
Gallic Acid ◽  
Qualitative Data ◽  
Molar Mass ◽  
Total Phenolic ◽  
Special Importance ◽  
Average Molar Mass ◽  
Complex Samples ◽  
Ulva Intestinalis ◽  
Polyphenolic Profile

In this case study, we explored quantitative 1H NMR (qNMR), HPLC-DAD, and the Folin-Ciocalteu assay (TPC) as methods of quantifying the total phenolic content of a green macroalga, Ulva intestinalis, after optimized accelerated solvent extraction. Tentative qualitative data was also acquired after multiple steps of purification. The observed polyphenolic profile was complex with low individual concentrations. The qNMR method yielded 5.5% (DW) polyphenols in the crude extract, whereas HPLC-DAD and TPC assay yielded 1.1% (DW) and 0.4% (DW) respectively, using gallic acid as the reference in all methods. Based on the LC-MS observations of extracts and fractions, an average molar mass of 330 g/mol and an average of 4 aromatic hydrogens in each spin system was chosen for optimized qNMR calculations. Compared to the parallel numbers using gallic acid as the standard (170 g/mol, 2 aromatic H), the optimized parameters resulted in a similar qNMR result (5.3%, DW). The different results for the different methods highlight the difficulties with total polyphenolic quantification. All of the methods contain assumptions and uncertainties, and for complex samples with lower concentrations, this will be of special importance. Thus, further optimization of the extraction, identification, and quantification of polyphenols in marine algae must be researched.

Mechanical stress influence on electronic transport in low-k SiOC dielectric single damascene capacitor

2013 ◽  
Vol 102 (19) ◽  
pp. 192912 ◽  
Author(s):  
Ya-Liang Yang ◽  
Tai-Fa Young ◽  
Ting-Chang Chang ◽  
Fu-Yen Shen ◽  
Jia-Haw Hsu ◽  
...  
Keyword(s):  
Mechanical Stress ◽  
Electronic Transport ◽  
Low K ◽  
Stress Influence
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