The Effect of Fillers on the Kinetics of Gelation and the Properties of Moisture-Absorbing Polymeric Materials

2009 ◽  
Vol 36 (5) ◽  
pp. 23-26
Author(s):  
M. V. Uspenskaya ◽  
N. V. Sirotinkin ◽  
E. A. Bondareva
Keyword(s):  
Polymeric Materials ◽  
Kinetics Of ◽  
Kinetics Of Gelation

The research on the effect of the milk-clotting ferments of different origin on the milk clots formation

2021 ◽  
pp. 27-29
Author(s):  
Елена Евгеньевна Илларионова ◽  
Александр Геннадьевич Кручинин ◽  
Дарья Николаевна Калугина ◽  
Светлана Николаевна Туровская
Keyword(s):  
Detailed Analysis ◽  
Milk Clotting ◽  
Kinetics Of ◽  
Kinetics Of Gelation ◽  
Different Origin

Проведены исследования воздействия химозина, смеси химозина-пепсина и пепсина на коагуляционные свойства молока, а также его УФ-концентрата. По результатам эксперимента наилучшая эффективность сычужного свертывания отмечена в пробах с пепсином, однако для более глубокого анализа кинетики гелеобразования целесообразно применение реологических методов. We conducted the research on the effect of chymozin, mixtures of chymosin-pepsin and pepsin on the coagulation properties of milk, as well as its UV concentrate. According to the results of our experiment, samples with pepsin show the best efficiency of rennet clotting. However, it is advisable to use rheological methods to conduct a more detailed analysis of the kinetics of gelation.

An Empirical Model for Predicting the Kinetics of Desorption of Ingredients from Polymeric Materials of Different Thickness

2017 ◽  
Vol 44 (4) ◽  
pp. 35-40
Author(s):  
A.V. Dedov
Keyword(s):  
Polymeric Material ◽  
Empirical Model ◽  
Polymeric Materials ◽  
Reduction Factor ◽  
Desorption Kinetics ◽  
Kinetics Of ◽  
Different Thickness

The use of an empirical model for predicting the desorption kinetics of ingredients and impurities from polymeric materials is analysed. A shortcoming of the model considered is the dependence of the reduction factor on the thickness of the polymeric material, which limits the use of different data. An approach for solving this problem is proposed.

Kinetics of Ethylene Oxide Desorption from Sterilized Materials

2013 ◽  
Vol 96 (1) ◽  
pp. 33-36 ◽  
Author(s):  
Gisela C Mendes ◽  
Teresa R S Brandão ◽  
Cristina L M Silva
Keyword(s):  
Ethylene Oxide ◽  
Medical Devices ◽  
Polymeric Materials ◽  
Fickian Diffusion ◽  
Oxide Content ◽  
Transfer Behavior ◽  
Kinetics Of ◽  
Diffusion Mass ◽  
Ethylene Oxide Gas ◽  
By Products

Abstract Ethylene oxide gas is commonly used to sterilize medical devices, and concerns about using this agent on biological systems are well-established. Medical devices sterilized by ethylene oxide must be properly aerated to remove residual gas and by-products. In this work, kinetics of ethylene oxide desorption from different sterilized materials were studied in a range of aeration temperatures. The experimental data were well-described by a Fickian diffusion mass transfer behavior, and diffusivities were estimated for two textile and two polymeric materials within the temperature range of 1.5 to 59.0°C. The results will allow predictions of ethylene oxide desorption, which is a key step for the design of sterilization/aeration processes, contributing to an efficient removal of residual ethylene oxide content.

Polymeric Materials Based on Acrylates and Modified Lignosulphonates

2017 ◽  
Vol 44 (2) ◽  
pp. 33-36
Author(s):  
V.I. Chursin
Keyword(s):  
Methacrylic Acid ◽  
Polymeric Materials ◽  
Enzymatic Treatment ◽  
Technical Grade ◽  
Kinetics Of

The effect of the enzymatic treatment of technical-grade lignosulphonates with laccase on the kinetics of synthesis and on the properties of copolymeric materials based on methacrylic acid was investigated.

scholarly journals Kinetics of gelation and universality

1983 ◽  
Vol 16 (10) ◽  
pp. 2293-2320 ◽  
Author(s):  
R M Ziff ◽  
M H Ernst ◽  
E M Hendriks
Keyword(s):  
Kinetics Of ◽  
Kinetics Of Gelation

Physical gelation process as direct evidence for crystallization behavior of isotactic polypropylene/clay composites

2016 ◽  
Vol 29 (12) ◽  
pp. 1656-1666 ◽  
Author(s):  
Ali Sarvi ◽  
Farhad Sharif
Keyword(s):  
Crystallization Kinetics ◽  
Early Stage ◽  
Relaxation Modulus ◽  
Polymeric Materials ◽  
Relative Crystallinity ◽  
Low Frequencies ◽  
Clay Concentration ◽  
Stage Crystallization ◽  
Physical Gelation ◽  
Kinetics Of

Early stage crystallization kinetics of polypropylene (PP)/clay composites is studied using rheometery. Relaxation modulus of composites is measured at low frequencies near liquid–solid transition. Small amplitude oscillating shear flow is applied at low frequencies to obtain relaxation modulus. Relaxation modulus of polymeric materials at the liquid–solid transition follows [Formula: see text], at long times ( λ < t < ∞), where λ is the time to crossover to a different relaxation regime, s is the gel stiffness, and n is the relaxation exponent. Inverse quenching technique is then employed to retain degree of crystallization while rheological measurements are made. Lower gel time is observed as clay concentration increased, indicating the formation of more nuclei. An improvement to Avrami’s equation is proposed to predict crystallization kinetics for PP/clay composites. There is a good agreement between predicted relative crystallinity values and empirical values.

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