516 Characterization of Micro- to Macroscopic Response of Trinary Polymer System

2003 ◽  
Vol 2003.16 (0) ◽  
pp. 403-404
Author(s):  
Naghi K. ESMAEILI ◽  
Wei LU ◽  
Yoshihiro TOMITA
Keyword(s):  
Polymer System ◽  
Macroscopic Response

Characterization of multiphase polymer system nylon 6/ABS blends

1990 ◽  
Vol 36 (7-8) ◽  
pp. 2339-2347 ◽  
Author(s):  
I. S. Bhardwaj ◽  
Vijai Kumar ◽  
A. B. Mathur ◽  
Anil Das
Keyword(s):  
Polymer System ◽  
Nylon 6

Preparation and characterization of composites based on poly(lactic acid)/poly(methyl methacrylate) matrix and sisal fiber bundles: The effect of annealing process

2020 ◽  
pp. 089270572093078
Author(s):  
Ander Orue ◽  
Jon Anakabe ◽  
Ane Miren Zaldua-Huici ◽  
Arantxa Eceiza ◽  
Aitor Arbelaiz
Keyword(s):  
Lactic Acid ◽  
Methyl Methacrylate ◽  
Polymer System ◽  
Annealing Process ◽  
Sisal Fiber ◽  
Maximum Temperature ◽  
Poly Lactic Acid ◽  
Poly Methyl Methacrylate ◽  
Sisal Fibers

The interest on poly(lactic acid) (PLA)/poly(methyl methacrylate) (PMMA) blends has increased during the last years due to their promising properties. The novelty of the current work focuses on the preparation and characterization of biocomposites based on PLA/PMMA matrix and NaOH-treated sisal fibers. The effect of the addition of treated sisal fibers on the physico-mechanical properties of high polylactide content composites was studied. For this purpose, PLA/PMMA blend (80/20 wt%) was prepared by melt-blending and reinforced with different fiber contents. Although composites showed interesting specific tensile properties, the estimated heat deflection temperature (HDT), that is, the maximum temperature at which a polymer system can be used as a rigid material, barely increased 4°C respect to unreinforced system. After the annealing process, the HDT of the unreinforced polymer blend increased around 25°C, whereas the composites showed an increase of at least 38°C. Nonetheless, the specific tensile strength of composite decreased approximately 48% because the adhesion between fiber and polymer matrix was damaged and cracks were formed during annealing process.

Structural characterization of unsaturated aggregated soil

2010 ◽  
Vol 47 (3) ◽  
pp. 297-311 ◽  
Author(s):  
A. Koliji ◽  
L. Vulliet ◽  
L. Laloui
Keyword(s):  
Soil Structure ◽  
Mercury Intrusion Porosimetry ◽  
Experimental Studies ◽  
Environmental Scanning Electron Microscopy ◽  
Structural Evolution ◽  
Environmental Scanning ◽  
Comprehensive Understanding ◽  
Soil Fabric ◽  
Macroscopic Response

Despite the recent experimental studies of soil structure, a comprehensive understanding of the macroscopic response of a soil in relation to its structure has not yet been achieved. This lack of understanding reveals the need for further assessments of soil structure and its evolution under loading. In this work, the structure of an aggregated soil under various conditions of saturation and mechanical loading is studied. We also compare the aggregated soil structure, which shows a double porous fabric, with that of the same soil when reconstituted. The experimental methods selected for this study are a combination of mercury intrusion porosimetry (MIP), environmental scanning electron microscopy (ESEM), and neutron computed tomography (CT). Using MIP and ESEM, we first examine the soil fabric at the intra-aggregate scale. Then, we quantify the structural evolution of the soil using neutron tomography and link it to the macroscopic response of the soil. Based on the experimental evidence, the main features of the soil structure and its evolution are outlined for unsaturated aggregated soil under different loading conditions.

Computer Simulations and Experimental Dynamical Characterization of a Composite Liquid Crystal-Polymer System

2010 ◽  
Vol 527 (1) ◽  
pp. 119/[275]-129/[285] ◽  
Author(s):  
Cesare Chiccoli ◽  
Paolo Pasini ◽  
Giancarlo Abbate ◽  
Antigone Marino ◽  
Claudio Zannoni
Keyword(s):  
Liquid Crystal ◽  
Computer Simulations ◽  
Polymer System ◽  
Liquid Crystal Polymer ◽  
Crystal Polymer

Characterization of Renewable Composites

2001 ◽  
Vol 702 ◽  
Author(s):  
A. Emekalam ◽  
X. Gu ◽  
D. Raghavan
Keyword(s):  
Composite Films ◽  
Polymer System ◽  
Phase System ◽  
Phase Imaging ◽  
Blend Films ◽  
Selective Degradation ◽  
Degradable Polymer ◽  
Wide Range ◽  
Multi Phase

ABSTRACTIn this study, we demonstrate the usefulness of chemical based method in combination with AFM to characterize a wide range of degradable polymer blends. This approach is based on selective degradation of one of the phase in a multi-phase system and the ability of TMAFM to provide nanoscale lateral information about the different phases in the polymer system. Composite films containing different percentage of hydrolyzable polymer were either melt processed/solution casted and then exposed to a hydrolytic acidic environment and analyzed using TMAFM. Pits were observed to form in the blend films. The progressive hydrolysis of the hydrolyzable component in the composite was studied by FTIR analyses. TMAFM phase imaging was used to follow pit growth of the blend as a function of exposure time. The usefulness of the chemical modification/AFM approach in the characterization of renewable porous material membranes is discussed.

Synthesis and Characterization of Poly(2-alkylbenzimidazole-alt-9,9-dihexylfluorene)s: A Dually Dopable Polymer System

2014 ◽  
Vol 47 (9) ◽  
pp. 2915-2920 ◽  
Author(s):  
Jared D. Harris ◽  
Charlotte Mallet ◽  
Cathrin Mueller ◽  
Carmen Fischer ◽  
Kenneth R. Carter
Keyword(s):  
Polymer System ◽  
Synthesis And Characterization

scholarly journals Food Packaging Permeability Behaviour: A Report

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Valentina Siracusa
Keyword(s):  
Food Packaging ◽  
Polymer System ◽  
Real Life ◽  
Polymer Materials ◽  
Market Area ◽  
Crucial Importance ◽  
Permeability Characteristics ◽  
Heterogeneous Polymer ◽  
Food Market

The use of polymer materials in food packaging field is one of the largest growing market area. Actually the optimization behaviour of packaging permeability is of crucial importance, in order to extend the food shelf-life and to reach the best engineering solution. Studying the permeability characterization of the different polymer material (homogeneous and heterogeneous polymer system) to the different packaging gases, in different environmental condition, is crucial to understand if the selected material is adapted to the chosen food contact field. Temperature and humidity parameters are of crucial importance for food quality preservation, especially in real life situations, like food market, and house long-life use. The aim of this report was to collect information about the state of the art on the permeability characteristics of the polymer packages used on food field.

scholarly journals Characterization of Monte Carlo Dynamic/Kinetic Properties of Local Structure in Bond Fluctuation Model of Polymer System

Materials ◽  
2021 ◽  
Vol 14 (17) ◽  
pp. 4962
Author(s):  
Wojciech Radosz ◽  
Grzegorz Pawlik ◽  
Antoni C. Mituś
Keyword(s):  
Monte Carlo ◽  
Glass Transition ◽  
Polymer System ◽  
Time Interval ◽  
Kinetic Properties ◽  
Physical Picture ◽  
Starting Point ◽  
Bond Fluctuation ◽  
Fluctuation Model

We report the results of the characterization of local Monte Carlo (MC) dynamics of an equilibrium bond fluctuation model polymer matrix (BFM), in time interval typical for MC simulations of non-linear optical phenomena in host-guest systems. The study contributes to the physical picture of the dynamical aspects of quasi-binary mosaic states characterized previously in the static regime. The polymer dynamics was studied at three temperatures (below, above and close to the glass transition), using time-dependent generalization of the static parameters which characterize local free volume and local mobility of the matrix. Those parameters play the central role in the kinetic MC model of host-guest systems. The analysis was done in terms of the probability distributions of instantaneous and time-averaged local parameters. The main result is the characterization of time scales characteristic of various local structural processes. Slowing down effects close to the glass transition are clearly marked. The approach yields an elegant geometric criterion for the glass transition temperature. A simplified quantitative physical picture of the dynamics of guest molecules dispersed in BFM matrix at low temperatures offers a starting point for stochastic modeling of host-guest systems.

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