Starch carboxymethylation by reactive extrusion: Reaction kinetics and structure analysis

2018 ◽  
Vol 194 ◽  
pp. 193-199 ◽  
Author(s):  
Romain Milotskyi ◽  
Christophe Bliard ◽  
Dominique Tusseau ◽  
Claude Benoit
Keyword(s):  
Reaction Kinetics ◽  
Structure Analysis ◽  
Reactive Extrusion ◽  
Extrusion Reaction

Preparation and Properties of Nylon 6,6 Grafted Graphene Composites

2020 ◽  
Vol 20 (3) ◽  
pp. 1977-1982 ◽  
Author(s):  
Zhang Xiaoxiang ◽  
He Jianxin ◽  
Wei Peng ◽  
Huang Xin ◽  
Tian Huimin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Chemical Structure ◽  
Reactive Extrusion ◽  
Composite Fiber ◽  
Pristine Graphene ◽  
Nylon 6,6 ◽  
Infrared Spectrometer ◽  
High Level ◽  
Nylon Composite ◽  
Extrusion Reaction

Nylon 6,6 composite fiber containing grafted graphene (nylon 6,6-g-graphene) was prepared by nylon and graphene grafted with acyl chloride (graphene-COCl) through extrusion reaction. Graphene-COCl was prepared through acid-treated reacting, graphene with thionyl chloride functional group. The chemical structure of nylon 6,6-g-graphene obtained using reactive extrusion technique was characterized using Fourier transform infrared spectrometer. It was found that this kind of composite fiber has the characteristics of less amount of graphene and excellent mechanical properties and has certain application prospects. Nylon 6,6-g-graphene dispersed evenly in the Nylon composite. But pristine graphene exhibited aggregate structure when composite was produced by pristine graphene through reactive extrusion. The composite reinforcement was increased obviously with the increase content of grafted graphene. After examined, the nylon/nylon 6,6-g-graphene with a certain content grafted graphene composite exhibited high level of reinforcement, and mechanical properties were improved.

scholarly journals Microwave energy assisted synthesis of poly lactic acid via continuous reactive extrusion: modelling of reaction kinetics

RSC Advances ◽  
2017 ◽  
Vol 7 (30) ◽  
pp. 18529-18538 ◽  
Author(s):  
Satya P. Dubey ◽  
Hrushikesh A. Abhyankar ◽  
Veronica Marchante ◽  
James L. Brighton ◽  
Björn Bergmann ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Reaction Kinetics ◽  
Ring Opening ◽  
Bimetallic Catalyst ◽  
Batch Process ◽  
Reactive Extrusion ◽  
Ring Opening Polymerization ◽  
Microwave Energy ◽  
Poly Lactic Acid ◽  
Organic Catalysts

The most commonly used batch process to manufacture PLA is ring opening polymerization (ROP) of lactide monomer in a suitable solvent, in the presence of a metallic/bimetallic catalyst (Sn, Zn, and Al) or other organic catalysts.

Preparation and reaction kinetics of polypropylene-graft-cardanol by reactive extrusion and its compatibilization on polypropylene/polystyrene

2013 ◽  
Vol 131 (4) ◽  
pp. n/a-n/a ◽  
Author(s):  
Qinhui Chen ◽  
Yi Deng ◽  
Xinggong Mao ◽  
Fengqin Yin ◽  
Jinhuo Lin
Keyword(s):  
Reaction Kinetics ◽  
Reactive Extrusion ◽  
Kinetics Of

Optimization and Scale-Up of Twin-Screw Reactive Extrusion: The Case of EVA Transesterification

2020 ◽  
Vol 35 (5) ◽  
pp. 422-428
Author(s):  
F. Berzin ◽  
C. David ◽  
B. Vergnes
Keyword(s):  
Numerical Modeling ◽  
Reaction Kinetics ◽  
Strong Coupling ◽  
Scale Up ◽  
Reactive Extrusion ◽  
Extrusion Process ◽  
Production Scale ◽  
Crucial Question ◽  
Twin Screw ◽  
Reactive Extrusion Process

Abstract Despite its complexity, reactive extrusion is continuously developing for the production of new and performing materials. Due to the strong coupling between flow, rheology and chemistry, optimizing this process for a given reaction remains a difficult task. Moreover, the scale-up from the laboratory to the production scale is another crucial question, which cannot be solved by conventional techniques. In this paper, we show how the use of numerical modeling may help answer these complex questions by providing realistic solutions, rapidly and without excessive costs. The example of a transesterification reaction was chosen because this reaction has been carefully characterized in previous studies. The reaction kinetics and the kinetic constants are well known and the modeling of this reactive extrusion process has proved to be realistic and accurate.

200kv superconducting cryo electron microscope

1987 ◽  
Vol 45 ◽  
pp. 642-643
Author(s):  
M. Iwatsuki ◽  
Y. Kokubo ◽  
Y. Harada ◽  
J. Lehman
Keyword(s):  
Electron Microscope ◽  
Structure Analysis ◽  
Organic Materials ◽  
Strong Interactions ◽  
Specimen Preparation ◽  
Great Effort ◽  
Electron Microscopic ◽  
Crystal Fields ◽  
Special Skill ◽  
Long Time

In recent years, the electron microscope has been significantly improved in resolution and we can obtain routinely atomic-level high resolution images without any special skill. With this improvement, the structure analysis of organic materials has become one of the interesting targets in the biological and polymer crystal fields.Up to now, X-ray structure analysis has been mainly used for such materials. With this method, however, great effort and a long time are required for specimen preparation because of the need for larger crystals. This method can analyze average crystal structure but is insufficient for interpreting it on the atomic or molecular level. The electron microscopic method for organic materials has not only the advantage of specimen preparation but also the capability of providing various information from extremely small specimen regions, using strong interactions between electrons and the substance. On the other hand, however, this strong interaction has a big disadvantage in high radiation damage.

Sign in / Sign up

Export Citation Format

Share Document