Results 11 to 20 of about 1,195 (236)

Instrument for mimicking fast cooling conditions of polymers: Design and case studies on polypropylene

Polymer Testing, 2021
The complete understanding of polymers crystallization kinetic in real industrial processes is fundamental for designing materials towards specific applications.
Enrico Carmeli, Dario Cavallo, Davide Tranchida   +2 more
doaj   +1 more source

Identification and Characterization Different Type of Plastics Waste Using X-Ray Diffraction and X-Ray Fluorescence

ARO-The Scientific Journal of Koya University, 2021
In this study, different types of polymers in post-consumer plastics with pure plastics have been studied. High-density polyethylene (HDPE1, HDPE2), Polyvinyl chloride (PVC3, PVC4), Polyethylene terephthalate (PET5, PET6) and Polypropylenes (PP7, PP8 ...
Shawbo A. Abubaker, Faten chaqmaqche, Akram Taha   +2 more
doaj   +1 more source

The role of defect microstructure in the crystallization behavior of metallocene and MgCl2-supported Ziegler-Natta isotactic poly(propylenes)

Polímeros, 2003
The intermolecular defect distribution of poly(propylenes) of the Ziegler-Natta (ZN) and metallocene (M) types is assessed by classical fractionation and analysis of the fractions by GPC and 13C NMR.
Rufina G. Alamo
doaj   +1 more source

Molecular weight and tacticity effect on morphological and mechanical properties of Ziegler–Natta catalyzed isotactic polypropylenes

Polímeros, 2015
The morphological and mechanical properties of Ziegler–Natta catalyzed isotactic polypropylenes as influenced by the molecular weight and tacticity was investigated. Polypropylene samples were injection moulded into standard disks with a HAAKE MiniJet II
Ismael Amer, Albert van Reenen, Touhami Mokrani   +2 more
doaj   +1 more source

High-resolution solid-state NMR study of isotactic polypropylenes

eXPRESS Polymer Letters, 2012
The high-resolution solid-state 13C NMR spectra were recorded for metallocene (m) and Ziegler-Natta (ZN) isotactic polypropylenes (iPP) in pelletized form using cross polarization (CP) and magic angle spinning (MAS) techniques within the temperature ...
O. Fricova, M. Uhrinova, V. Hronsky, M. Kovalakova, D. Olcak, I. Chodak, J. Spevacek   +6 more
doaj   +1 more source

Determinação da constante cinética de cristalização não-isotérmica de polipropilenos modificados com ácido acrílico e anidrido maleico Determination of the non-isothermal crystallization rate constant of grafted maleic anhydride and grafted acrylic acid polypropylenes

Polímeros, 2006
O propósito do presente trabalho foi testar a validade do Método da Curva Mestre para a determinação da constante de cristalização não-isotérmica de polipropilenos modificados com anidrido maleico e ácido acrílico.
Benjamim de M. Carvalho, Rosario E. S. Bretas   +1 more
doaj   +1 more source

Comparison of scar outcomes of alar flare region using absorbable and non-absorbable sutures: a single-blind study

Brazilian Journal of Otorhinolaryngology, 2022
Objective: Formation of scar on the face after septorhinoplasty may disturb the patient due to cosmetic concerns. One of the main factors affecting scar outcomes is probably the suture material used.
Mehmet Emrah Ceylan, Hasan Hüseyin Balıkçı   +1 more
doaj   +1 more source

Does a bilateral polypropylene mesh alter the duct deferens morphology, testicular size and testosterone levels? Experimental study in rats [PDF]

Acta Cirúrgica Brasileira, 2020
Purpose To evaluate the effect of a PP mesh on duct deferens morphology, testicular size and testosterone levels. Methods Forty adult male rats were distributed into groups: 1) no surgery; 2) inguinotomy; 3) mesh placed on the duct deferens; and 4 ...
Sérgio Henrique Bastos Damous, Luciana Lamarão Damous, Jocielle dos Santos Miranda, Edna Frasson de Souza Montero, Cláudio Birolini, Edivaldo Massazo Utiyama   +5 more
doaj   +1 more source

Treatment of abdominal wall hernia with suture, or polypropylene, or collagen prosthesis [PDF]

Acta Cirúrgica Brasileira, 2016
PURPOSE: To develop an experimental model for incisional hernias and to compare morphological and functional aspects of hernia repairs by suture, polypropylene mesh and collagen mesh.
Diego Paim Carvalho Garcia, Clarissa Santos Neto, Pablo Nelson do Valle Hubner, Thiago de Almeida Furtado, Andy Petroianu, Luiza Ohasi de Figueiredo, Luiz Ronaldo Alberti   +6 more
doaj   +1 more source

New strategies to improve results of mesh surgeries for vaginal prolapses repair – an update

International Brazilian Journal of Urology, 2015
The use of meshes has become the first option for the treatment of soft tissue disorders as hernias and stress urinary incontinence and widely used in vaginal prolapse's treatment.
Fernando Goulart Fernandes Dias, Paulo Henrique Goulart Fernandes Dias, Alessandro Prudente, Cassio Riccetto   +3 more
doaj   +1 more source