scholarly journals Effect of Carbon Nanostructures and Fatty Acid Treatment on the Mechanical and Thermal Performances of Flax/Polypropylene Composites

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 438 ◽  
Author(s):  
Pietro Russo ◽  
Libera Vitiello ◽  
Francesca Sbardella ◽  
Jose I. Santos ◽  
Jacopo Tirillò ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Carbon Nanostructures ◽  
Interfacial Adhesion ◽  
Ethanol Solution ◽  
Polypropylene Composites ◽  
Maleated Polypropylene ◽  
Flax Fibers ◽  
Hydrophilic Nature ◽  
Fatty Acid Treatment ◽  
Selection Of

Four different strategies for mitigating the highly hydrophilic nature of flax fibers were investigated with a view to increase their compatibility with apolar polypropylene. The effects of two carbon nanostructures (graphene nanoplatelets (GNPs) and carbon nanotubes (CNTs)), of a chemical modification with a fatty acid (stearic acid), and of maleated polypropylene on interfacial adhesion, mechanical properties (tensile and flexural), and thermal stability (TGA) were compared. The best performance was achieved by a synergistic combination of GNPs and maleated polypropylene, which resulted in an increase in tensile strength and modulus of 42.46% and 54.96%, respectively, compared to baseline composites. Stearation proved to be an effective strategy for increasing the compatibility with apolar matrices when performed in an ethanol solution with a 0.4 M concentration. The results demonstrate that an adequate selection of surface modification strategies leads to considerable enhancements in targeted properties.

Polypropylene Crystallization on Maleated Polypropylene-Treated Wood Surfaces: Effects on Interfacial Adhesion in Wood Polypropylene Composites

1992 ◽  
Vol 266 ◽  
Author(s):  
Paul C. Kolosick ◽  
George E. Myers ◽  
James A. Koutsky
Keyword(s):  
Interfacial Adhesion ◽  
Treated Wood ◽  
Untreated Wood ◽  
Model System ◽  
Intercellular Spaces ◽  
Wood Veneer ◽  
Polypropylene Composites ◽  
Maleated Polypropylene ◽  
Peel Adhesion ◽  
Wood Surfaces

AbstractPolypropylene (PP)-wood veneer laminates were used as a model system to investigate adhesion in wood-polypropylene composites. Wood veneers were treated with maleated polypropylene waxes (MA-PP). PP films were then compression molded to the wood surfaces and peel forces were measured.Low MA-PP treatment levels increased the peel adhesion over that for untreated surfaces. High MA-PP treatment levels decreased the peel adhesion and intermediate MA-PP levels had no effect on the peel adhesion. Microscopy of the fracture surfaces indicated PP penetration into lumens in both treated and untreated wood veneer. Untreated surfaces also exhibited PP penetration into pits and intercellular spaces, while treated surfaces exhibited only hindered penetration on this scale. The penetrated PP formed tendrils during fracture. DSC of PP on wood and cellulose surfaces showed higher PP crystallization temperatures on untreated surfaces than on treated surfaces.

scholarly journals Omega-3 fatty acid treatment of children with attention-deficit hyperactivity disorder: A randomized, double-blind, placebo-controlled study

2009 ◽  
Vol 14 (2) ◽  
pp. 89-98 ◽  
Author(s):  
Stacey Ageranioti Bélanger ◽  
Michel Vanasse ◽  
Schohraya Spahis ◽  
Marie-Pierre Sylvestre ◽  
Sarah Lippé ◽  
...  
Keyword(s):  
Attention Deficit Hyperactivity Disorder ◽  
Fatty Acid ◽  
Acid Treatment ◽  
Controlled Study ◽  
Omega 3 ◽  
Double Blind ◽  
Double Blind Placebo ◽  
Omega 3 Fatty Acid ◽  
Hyperactivity Disorder ◽  
Fatty Acid Treatment

scholarly journals Genetic Polymorphism of SCD1 Gene of Holstein-Friesian Cows in Indonesia

2019 ◽  
Vol 24 (2) ◽  
pp. 56
Author(s):  
Ari Sulistyo Wulandari ◽  
HD Rahayu ◽  
SD Volkandari ◽  
N Herlina ◽  
S Anwar ◽  
...  
Keyword(s):  
Fatty Acid ◽  
Genetic Polymorphism ◽  
Breeding Strategy ◽  
Holstein Friesian ◽  
Pcr Rflp ◽  
Hardy Weinberg Equilibrium ◽  
Molecular Selection ◽  
Friesian Cattle ◽  
Selection Of ◽  
Friesian Cows

<p class="abstrak2">Stearoyl-Coenzyme A desaturase 1 (SCD1) belongs to the fatty acid family of desaturases. In lactating ruminants, the SCD1 protein is highly expressed in the mammary gland and is relevant for the fatty acid composition of milk and dairy products. Polymorphism of SCD1 gene in Holstein-Friesian (HF) cows could be used as a basis of molecular selection of cattle in order to increase their productivity. The aim of this study was to investigate the polymorphism of SCD1 gene of Holstein-Friesian cows in Indonesia. A total of 162 blood samples of HF cows were collected from four different locations i.e. Bogor, Sukabumi, Tasikmalaya and Enrekang districts. Genotyping of SCD1 gene used PCR-RFLP method with NcoI restriction enzyme. The result showed that three genotypes (AA, AV and VV) and two alleles (A and V) have successfully found and polymorphic. A allele was dominant in all populations (0.63) and in Hardy Weinberg Equilibrium. The highest A allele was found in Sukabumi (0.78) and the lowest was in Bogor (0.55). Heterozigosity observed and expected reached 0.471 and 0.470, respectively. In conclusion, genetic polymorphism was found in all population with dominant of A allele. This finding can be used as a early genetic information of Holstein-Friesian cattle in Indonesia and to build breeding strategy for improving of productivity especially improving of healthy fat milk. </p><p class="abstrak2"><span><br /></span></p>

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