Results 21 to 30 of about 23,424,289 (221)

Retarded Crystallization and Promoted Phase Transition of Freeze-Dried Polybutene-1: Direct Evidence for the Critical Role of Chain Entanglement.

ACS Macro Letters, 2022
Polymorphism and crystal transition are common phenomena of semicrystalline polymers. These two behaviors are known to be controlled by the nucleation and chain mobility of polymers, both of which are constrained by the chain entanglement at the ...
Lingling Ni, Shanshan Xu, Chenxuan Sun, Yanan Qin, Ying Zheng, Jian Zhou, Chengtao Yu, Pengju Pan   +7 more
semanticscholar   +1 more source

Applicazione della meccanica della frattura viscoelastica alla previsione della vita di tubi in polibutene

Fracture and Structural Integrity, 2013
Isotactic polybutene-1 (i-PB1) is a polymer used for the manufacturing of pressurized pipes. In this work two grades of i-PB1 with a different degree of isotacticity have been investigated; they have been supplied by Basell Polyolefins. Fracture tests
Luca Andena, Marta Rink, Roberto Frassine   +2 more
doaj   +3 more sources

Validation of the poke-flow technique combined with simulations of fluid flow for determining viscosities in samples with small volumes and high viscosities [PDF]

Atmospheric Measurement Techniques, 2015
Viscosity in particles consisting of secondary organic material (SOM) has recently become an area of research focus, since information on viscosity is needed to predict the environmental impacts of SOM particles. Recently Renbaum-Wolff et al.
J. W. Grayson, M. Song, M. Sellier, A. K. Bertram   +3 more
doaj   +1 more source

Soft, environmentally degradable microfluidic devices for measurement of sweat rate and total sweat loss and for colorimetric analysis of sweat biomarkers

EcoMat, Volume 5, Issue 1, January 2023., 2023
Soft, skin‐interfaced microfluidic systems exploit biodegradable thermoplastic copolyester elastomers for the microfluidic layers, cellulose films and pressure sensitive adhesives as sealing layers, and carefully selected chemical reagents as colorimetric assays for monitoring sweat loss, sweat rate, pH, and chloride concentration.
Shanliangzi Liu, Da Som Yang, Shaotang Wang, Haiwen Luan, Yurina Sekine, Jeffrey B. Model, Alexander J. Aranyosi, Roozbeh Ghaffari, John A. Rogers   +8 more
wiley   +1 more source

Characterization of biodegradable food packaging films prepared with polyamide 4: Influence of molecular weight and environmental humidity

Food Bioengineering, Volume 1, Issue 3-4, Page 276-288, December 2022., 2022
Colorless and translucent polyamide 4 (PA4) films, which are both bio‐based and biodegradable, were prepared by the solution casting method in a dual‐solvent system. The physical properties of single PA4 films were originally characterized, and the effects of molecular weight and environmental humidity on PA4 were investigated. Abstract The development
Di Zhang, Rong Nie, Chunyue Zhang, Yibing Wang, Li Wang, Tao Chen, Liming Zhao   +6 more
wiley   +1 more source

Interlocking shish‐kebab morphology in polybutene‐1 [PDF]

Journal of Polymer Science Part B: Polymer Physics, 2002
AbstractThe aim of this research was to explore the effect of shear‐controlled orientation injection molding (SCORIM) on polybutene‐1 (PB‐1). This article describes the methods and processing conditions used for injection molding and discusses the properties of the moldings.
Kalay G., Kalay, C.R.
openaire   +4 more sources

Investigations into the characterization, degradation, and applications of biodegradable polymers by mass spectrometry

Mass Spectrometry Reviews, EarlyView., 2023
Abstract Biodegradable polymers have been getting more and more attention because of their contribution to the plastic pollution environmental issues and to move towards a circular economy. Nevertheless, biodegradable materials still exhibit various disadvantages restraining a widespread use in the market.
Paola Rizzarelli, Melania Leanza, Marco Rapisarda   +2 more
wiley   +1 more source

Computational Predictions for Boger Fluids and Circular Contraction Flow under Various Aspect Ratios

Fluids, 2020
This work puts forward a modeling study contrasted against experimental, with focus on abrupt circular contraction flow of two highly-elastic constant shear-viscosity Boger fluids, i.e., a polyacrylamide dissolved in corn-syrup PAA/CS (Fluid-1) and a ...
J. Esteban López-Aguilar, Hamid R. Tamaddon-Jahromi   +1 more
doaj   +1 more source

Fractionated and Confined Crystallization of Polybutene-1 in Immiscible Polypropylene/Polybutene-1 Blends

Chinese Journal of Polymer Science, 2018
In this work, the crystallization of immiscible polypropylene (PP)/polybutene-1 (PB) blends, in particular the effect of crystal morphology of PP (HTC, high Tm component) on the subsequent crystallization behavior of PB (LTC, low Tm component) was studied.
Yao Xu, Liu Chenguang, Huarong Nie, Aihua He   +3 more
openaire   +3 more sources

Mpemba Effect in Crystallization of Polybutene-1 [PDF]

arXiv, 2022
The Mpemba effect and its inverse can be understood as a result of nonequilibrium thermodynamics. In polymers, changes of state are generally non-equilibrium processes. However, the Mpemba effect has been rarely reported in the crystallization of polymers. In the melt, polybutene-1 (PB-1) has the lowest critical cooling rate in polyolefins and tends to
arxiv