Consulta: subjectFacets:"Polypropylene"
Registros recuperados: 5
Data/hora: 08/06/2024 13:52:52

Evaluation of the potential of three non-woven flax fiber reinforcements: Spunlaced, needlepunched and paper process mats
Provedor de dados: 5
Autores: Martin, Nicolas; Davies, Peter; Baley, Christophe.
This paper presents results from an experimental study of three types of non-woven preforms (needlepunched, spunlaced and mat manufactured using a paper-making process) intended as composite reinforcement. These are potentially very attractive for transport applications. First, the influence of processing on elementary fiber tensile properties is shown to be limited. Then the preforms are evaluated in polypropylene matrix composites and mechanical properties are determined. The structure of non-woven reinforcements is strongly dependent on the manufacturing route. By varying the fiber content it is shown that the most efficient reinforcement for flax fibers is the mat produced by paper processing. The new spunlaced reinforced composites are shown to have...
Tipo: Text
Palavras-chave: Flax fibers; Non-wovens; Composite materials; Polypropylene.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00307/41798/41241.pdf

Influence of the degree of retting of flax fibers on the tensile properties of single fibers and short fiber/polypropylene composites
Provedor de dados: 5
Autores: Martin, Nicolas; Mouret, Nicolas; Davies, Peter; Baley, Christophe.
The flax quality required for composite applications is not yet well established. Retting is one of the steps that are not well defined for these applications, and is a critical parameter during flax production. In this study, the influence of the degree of retting of flax on the properties of short flax fiber/polypropylene composites has been assessed. First, the degree of retting of gradually retted flax was measured by both qualitative and quantitative experimental techniques. In addition, water sorption studies were performed. Furthermore, tensile tests were carried out on both single fiber and injected composite materials. The microstructure of the composites was analyzed by scanning electron microscopy and X-ray microtomography. Single fiber and...
Tipo: Text
Palavras-chave: Flax fibers; Dew-retting; Composite materials; Polypropylene; Injection molding.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00160/27076/25475.pdf

Tissue-Specific Biomarker Responses in the Blue Mussel Mytilus spp. Exposed to a Mixture of Microplastics at Environmentally Relevant Concentrations
Provedor de dados: 5
Autores: Revel, Messika; Lagarde, Fabienne; Perrein-ettajani, Hanane; Bruneau, Mélanie; Akcha, Farida; Sussarellu, Rossana; Rouxel, Julien; Costil, Katherine; Decottignies, Priscilla; Cognie, Bruno; Châtel, Amélie; Mouneyrac, Catherine.
The impact of a microplastic (MP) mixture composed of polyethylene (PE) and polypropylene (PP) plastic particles, prepared from commercially available products, was evaluated in blue mussels Mytilus spp. exposed to three environmentally relevant concentrations: 0.008 μg L−1 (low), 10 μg L−1 (medium), and 100 μg L−1 (high). Organisms were exposed for 10 days followed by 10 days of depuration in clean seawater under controlled laboratory conditions. The evaluation of MP effects on mussel clearance rate, tissue structure, antioxidant defenses, immune and digestive parameters, and DNA integrity were investigated while the identification of plastic particles in mussel tissues (gills, digestive gland, and remaining tissues), and biodeposits (feces and...
Tipo: Text
Palavras-chave: Microplastics; Polyethylene; Polypropylene; Mytilus; Oxidative stress; Biomarkers.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00489/60089/63427.pdf

Gross and Histologic Evaluation of Abdominal Adhesions Associated with Chromic Catgut and Polypropylene Sutured Enteropexies in Dog
Provedor de dados: 77
Autores: Akinrinmade,J. F; Lawal,A. O.
The gross and histologic patterns of abdominal adhesions formed by the use of chromic catgut and polypropylene suture materials were evaluated in dogs. Gross and histologic examinations did not reveal significant difference (p&gt;0.05) in the degree of adhesions observed at enteropexy sites in both suture materials. The use of polypropylene with superior suture qualities should be considered instead of chromic catgut for procedures in which adhesion is desired in the dog.
Tipo: Journal article
Palavras-chave: Adhesion; Chromic catgut; Polypropylene; Eneropexy.
Ano: 2010
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-95022010000400037

Microclimatic modifications and productive responses of the Iceberg lettuce (Lactuca sativa) in protected environments
Provedor de dados: 124
Autores: Otto,Rosana Fernandes; Niesing,Priscila Cristina; Cortez,Marluce Gonçalves; Oliveira,Ana Elise de.
Experiments were carried out in Ponta Grossa - PR, Brazil, in the winter and spring/summer periods with iceberg lettuces cultivars Lucy Brown and Raider Plus. The objectives were to assess the lettuce productive responses and the intensity of the microclimate modifications in five cropping systems as under shade nets Aluminet 40-O® (AL) and ChromatiNet Vermelha® 40 (CR), a low tunnel covered with transparent polyethylene (TU), direct cover white nonwoven (NW) and natural conditions (NT). A complete randomized design was used for both the experiments with five treatments placed in a 5x2 factorial arrangement (cropping systems x cultivars) and four replications. The photosynthetically active radiation and air temperature were monitored by installing probes...
Tipo: Info:eu-repo/semantics/article
Palavras-chave: Tunnel; Nonwoven; Aluminet 40-O®; ChromatiNet Vermelha® 40; Polypropylene.
Ano: 2013
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1806-66902013000400026