Self-Oscillating Membranes with Polymer Interface Synchronized with Chemical Oscillator to Reproduce Lifelike Pulsatile Flow

2020 ◽  
Author(s):  
Marianne Benoit ◽  
Denis Bouyer ◽  
Philippe Sistat ◽  
André Ayral ◽  
Didier Cot ◽  
...  
Keyword(s):  
Pulsatile Flow ◽  
Polymer Interface ◽  
Chemical Oscillator

Protective Effects of Pulsatile Flow during Cardio-Pulmonary Bypass

2016 ◽  
Vol 64 (S 02) ◽  
Author(s):  
A. Salameh ◽  
L. Kuehne ◽  
M. Grassl ◽  
M. Gerdom ◽  
S. von Salisch ◽  
...  
Keyword(s):  
Pulsatile Flow ◽  
Protective Effects ◽  
Cardio Pulmonary Bypass ◽  
Pulmonary Bypass

A Study of Doppler Waveform Using Pulsatile Flow Model

1997 ◽  
Vol 37 (2) ◽  
pp. 225 ◽  
Author(s):  
Hye Won Chung ◽  
Myung Jin Chung ◽  
Jae Hyung Park ◽  
Jin Wook Chung ◽  
Dong Hyuk Lee ◽  
...  
Keyword(s):  
Pulsatile Flow ◽  
Flow Model ◽  
Doppler Waveform

Surface Modification of Poly (alkyl/Arylphosphazene) Thin Films

2000 ◽  
Vol 629 ◽  
Author(s):  
John V. St. John ◽  
Patty Wisian-Neilson
Keyword(s):  
Thin Films ◽  
Surface Modification ◽  
Chemical Resistance ◽  
Chemical Properties ◽  
Inorganic Polymers ◽  
Thin Polymer Films ◽  
Hydrophilic Interactions ◽  
Carboxylic Acid Groups ◽  
Polymer Interface ◽  
Thin Polymer

ABSTRACTPoly (methylphenylphosphazene) (PMPP) is an example of a unique class of inorganic polymers with alternating – (P=N)– backbones. Chemical modification of bulk PMPP can result in changes of physical properties such as chemical resistance, onset temperature of thermal degradation, elasticity, and flexibility. Surface modification of PMPP allows tailoring of the chemical properties at the polymer interface while maintaining the integrity of the bulk polymer. In this research, PMPP thin films were treated to form carboxylate or carboxylic acid groups at the surface. Surface modification was monitored by following changes in contact angle. The hydrophobic/hydrophilic interactions of carboxylated PMPP surfaces allow for mesoscale interactions of thin polymer films.

The Reactive Formation of Diblock Copolymer at a Polymer/Polymer Interface and its Effect on Interfacial Structure

2000 ◽  
Vol 629 ◽  
Author(s):  
Jonathan S. Schulze ◽  
Timothy P. Lodge ◽  
Christopher W. Macosko
Keyword(s):  
Molecular Weight ◽  
Interfacial Structure ◽  
Root Mean Square Roughness ◽  
Radius Of Gyration ◽  
Interfacial Region ◽  
Force Microscopy ◽  
Amino Terminal ◽  
Polymer Interface ◽  
Atomic Force ◽  
Time Required

ABSTRACTThe reaction of perdeuterated amino-terminal polystyrene (dPS-NH2) with anhydrideterminal poly(methyl methacrylate) (PMMA-anh) at a PS/PMMA interface has been observed with forward recoil spectrometry (FRES). Bilayer samples were constructed by placing thin films of PS containing ∼8.5 wt % dPS-NH2 on a PMMA-anh layer. Significant reaction was observed only after annealing the samples at 174°C for several hours, a time scale at least two orders of magnitude greater than the time required for the dPS-NH2 chains to diffuse through the bulk PS layer. The topography of the interfacial region as copolymer formed was measured using atomic force microscopy (AFM). Roughening of the PS/PMMA interface was observed to varying degrees in all annealed samples. Furthermore, the extent of this roughening was found to depend on the PS matrix molecular weight. Reaction in the samples with a high molecular weight PS matrix resulted in a root mean square roughness approximately equal to the radius of gyration Rg of the copolymer. However, approximately twice as much roughening was observed in the low molecular weight PS matrix. This study reveals how the molecular weight of one of the phases can affect the rate of reaction at a polymer/polymer interface.

Analysis of pulsatile flow in arteriovenous fistula through numerical simulation

2018 ◽  
Author(s):  
Willyam Brito de Almeida Santos ◽  
Jonhattan Ferreira Rangel ◽  
Valquíria Bomfim Fernandes ◽  
Luiz Henrique Pinheiro de Lima ◽  
Thercio Costa ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Arteriovenous Fistula ◽  
Pulsatile Flow
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