Polyester
Mostrando 13-24 de 222 artigos, teses e dissertações.
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13. Evapotranspiration and water sensitivity of Amazonian yellow ipe seedlings under different shading conditions
RESUMO A falta de informações técnicas sobre as exigências agroclimáticas e ecofisiológicas de espécies florestais, principalmente na fase inicial, limitam a produção de mudas de qualidade, o planejamento e a otimização de viveiros. Determinou-se a evapotranspiração, coeficientes de cultivo (kc) e os fatores de sensibilidade hídrica (ky) de mud
Rev. bras. eng. agríc. ambient.. Publicado em: 09/09/2019
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14. Comparative study of peritoneal adhesions after intraperitoneal implantation in rats of meshes of polypropylene versus polypropylene/polyglecaprone versus polyester/porcine collagen
Abstract Purpose To Compare the extent and intensity of adhesions formed between the intra-abdominal organs and the intraperitoneal implants of polypropylene mesh versus polypropylene/polyglecaprone versus polyester/porcine collagen used for correction of abdominal wall defect in rats. Methods After the defect in the abdominal wall, thirty Wistar rats we
Acta Cir. Bras.. Publicado em: 19/08/2019
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15. Chitosan Imparts Better Biological Properties for Poly(ε-caprolactone) Electrospun Membranes than Dexamethasone
Poly(ε-caprolactone), an aliphatic polyester with biodegradability and cytocompatibility, has been used to create scaffolds for tissue engineering purposes. However, the hydrophobicity and low water absorptivity of poly(ε-caprolactone) reduce cell anchorage on their membranes. Here, poly(ε-caprolactone)-based scaffolds were prepared by electrospinning of
J. Braz. Chem. Soc.. Publicado em: 12/08/2019
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16. Mechanical Study of the Properties of Sutures used in Orthopedics Surgeries
Resumo Objetivo Avaliar as propriedades mecânicas dos fios de sutura normalmente usados nas cirurgias ortopédicas e caracterizar seu comportamento por meio de ensaios de tração para verificar qual deles apresenta maior resistência mecânica. Método Os ensaios de tração dos diferentes tipos de fios de sutura foram feitos na máquina de ensaios mec
Rev. bras. ortop.. Publicado em: 29/07/2019
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17. ASSESSMENT OF POLYHYDROXYALKANOATE SYNTHESIS IN SUBMERGED CULTIVATION OF Cupriavidus necator AND Burkholderia cepacia STRAINS USING SOYBEAN AS SUBSTRATE
ABSTRACT Polyhydroxyalkanoates (PHA) are biocompatible and biodegradable polyesters produced by prokaryotic microbes for energy storage and carbon reserve. These polymers are an option to diminish the massive impact caused by inadequate disposal of synthetic plastics. In this study, evaluation and characterization of PHA produced by Cupriavidus necator (IPT
Braz. J. Chem. Eng.. Publicado em: 15/07/2019
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18. Study on mechanical & thermal properties of PCL blended graphene biocomposites
Abstract Graphene is a new carbon based nonmaterial that attracts the technology and constitutes one of the great promises for nanotechnology applications in a near feature. It’s having versatile intrinsic mechanical, thermal and electrical properties.By Incorporation of small amount of graphene fillers into polymer matrix can create attractive bio composi
Polímeros. Publicado em: 04/07/2019
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19. EFFECT OF NOZZLES, APPLICATION RATES, AND ADJUVANTS ON SPRAY DEPOSITION IN WHEAT CROPS
ABSTRACT The use of insecticides is common in pest management in wheat crops but may lead to higher production costs and environmental contamination. Therefore, a more comprehensive and uniform distribution of plant protection products in the desired target is recommended. The objective of this study is to evaluate the effect of different spray nozzles, appl
Eng. Agríc.. Publicado em: 2019-02
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20. Failure Theories and Notch Type Effects on the Mechanical Properties of Jute-Glass Hybrid Composite Laminates
This study aimed to analyze the mechanical properties and damage characteristics in uniaxial tensile loading of two hybrid composite laminates consisting of an ortho-therephthalic polyester matrix reinforced by bidirectional jute fabrics and E-glass fibers, with different configurations and types of geometric discontinuities in the longitudinal section, char
Mat. Res.. Publicado em: 31/01/2019
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21. Mechanical behavior and water absorption in sisal/glass hybrid composites
ABSTRACT This study aimed to assess the effect of hybridization on thermomechanical properties and water absorption of composite materials, by introducing sisal fiber tissue into the material. To that end, two composite material plates were manufactured, the first with five layers of E-glass reinforcement mat and the second with three layers of E-glass fiber
Matéria (Rio J.). Publicado em: 06/12/2018
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22. Bonding properties and crystallization kinetics of thermoplastic polyurethane adhesive
ABSTRACT The advantages of heterophasic thermoplastic polyurethanes (TPUs), such as their phase behavior and mechanical properties, make these materials an important class of adhesives. Whereas the amorphous phase contributes to good adhesion properties, the crystalline phase is responsible for the cohesive force of TPU adhesives. This work investigates the
Matéria (Rio J.). Publicado em: 06/12/2018
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23. Sericin as compatibilizer in starch/ polyester blown films
Abstract This study investigated the effects of low concentrations of sericin (≤ 1.5 wt%) in starch- poly(butylene-adipate-co-terephthalate) (PBAT) films. The films were produced by blown extrusion and mechanical, barrier and structural properties were determined. Films containing 1.0 and 1.5 wt% sericin showed higher tensile strength (6.41 and 6.59 MPa)
Polímeros. Publicado em: 29/11/2018
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24. Effects of stocking density and artificial substrates on yield and water quality in a biofloc shrimp nursery culture
ABSTRACT The objective of this study was to evaluate the effect of different stocking densities and the presence/absence of two artificial substrates on water quality and production rates of marine shrimp in a biofloc shrimp nursery culture. Two experiments were performed: different stocking densities with mosquito netting substrate and the presence/absence
R. Bras. Zootec.. Publicado em: 04/10/2018