Results 261 to 270 of about 1,604,865 (319)

Upcycling of Polyethylene Terephthalate to Continuously Reprocessable Vitrimers through Reactive Extrusion

Macromolecules, 2021
Vitrimers are expected to combine features of thermosets and thermoplastics but their continuous reprocessing is still a challenge; poly(ethylene terephthalate) (PET) has been widely used in our da...
Jianfan Qiu, Songqi Ma, Sheng Wang, Zhaobin Tang, Qiong Li, Anping Tian, Xiwei Xu, Binbo Wang, Na Lu, Jin Zhu   +9 more
semanticscholar   +1 more source

Reactive Extrusion of Styrene Polymers

International Polymer Processing, 1993
Abstract Reactive extrusion is the term used to denote a plastics processing method in which an extruder is used as a reactor for the continuous synthesis and modification of polymers. This paper describes the manufacture of polystyrene and styreneisoprene copolymers by a reactive extrusion process: anionic “living” s-butyl lithium ...
W. Michaeli, H. Höcker, U. Berghaus, W. Frings   +3 more
openaire   +1 more source

Esterification in reactive extrusion

Polymer Engineering & Science, 1995
AbstractA condensation type reaction has been studied for reactive extrusion in a twin‐screw extruder. The esterification reaction is to graft a nonylphenyl‐ethoxylate (NP8) onto a pre‐maleated ethylene‐propylene (EPRMA). The kinetics were initially characterized in the static mixture using a thermally controlled call in a FTIR spectrometer. These were
C. Maier, M. Lambla
openaire   +1 more source

Reactive Extrusion:  Toward Nanoblends

Macromolecules, 1999
By nanoblends, it is meant that the scale of dispersion of one polymer phase in the other is below 100 nm. A novel method was developed to prepare nanostructured blends (nanoblends) of polypropylene (PP) and polyamide-6 (PA-6) directly in a screw extruder. It consisted of polymerizing a monomer of PA-6, e-caprolactam (e-CL), in the matrix of PP.
Guo-Hua Hu, Hervé Cartier, Christopher Plummer   +2 more
openaire   +1 more source

Reactive Extrusion of SAN/EPDM Blends

International Polymer Processing, 2004
Abstract The blending of styrene-acrylonitrile copolymer (SAN) and three different types of ethylene-propylene-diene terpolymer (EPDM) by reactive extrusion was studied and the free radical initiators: 2,5-dimethyl-2,5-di-(t-butylperoxy)hexane (Luperco 101 XL), 2,5-dimethyl-2,5-di-(t-butylperoxy)hexyne-3 (Luperco 130 XL), α,α′-di(t ...
Jelenčić, Jasenka, Jelčić, Želimir, Kratofil Krehula, Ljerka, Janović, Zvonimir, Hrnjak-Murgić, Zlata   +4 more
openaire   +3 more sources

Starch Modification Using Reactive Extrusion

Starch - Stärke, 2006
AbstractThis paper presents a review of the principle and technologies in reactive extrusion and their application in starch modification and preparation of starch derivatives, such as starch graft copolymers, glycosides, cationic starch, or oxidized starch.
Xie, Fengwei, Yu, Long, Liu, Hongshen, Chen, Ling   +3 more
openaire   +2 more sources

Starch esterification by reactive extrusion

Industrial Crops and Products, 2000
The objectives of this study were to synthesize starch-fatty acid esters via a reactive extrusion process and to determine the effects of level and chain length of the anhydrides used on the physical properties of the extrudates. Starch esters were synthesized by extruding 70% amylose starch with fatty acid anhydrides and sodium hydroxide (catalyst) in
V.D. Miladinov, M.A. Hanna
openaire   +1 more source

Upcycling Polyolefin Blends into High-Performance Materials by Exploiting Azidotriazine Chemistry Using Reactive Extrusion.

Journal of the American Chemical Society
The revalorization of incompatible polymer blends is a key obstacle in realizing a circular economy in the plastics industry. Polyolefin waste is particularly challenging because it is difficult to sort into its constituent components.
Thomas Vialon, Huidi Sun, Georges J. M. Formon, Paul Galanopoulo, C. Guibert, Frédéric Averseng, MARIE-NOËLLE Rager, A. Percot, Yohann Guillaneuf, Nathan J. Van Zee, Renaud Nicolaÿ   +10 more
semanticscholar   +1 more source

Acrylated polyurethanes by reactive extrusion

Polymer Bulletin, 1994
A one-step acrylated polyurethanes prepolymers synthesis by reactive extrusion and bulk reaction is discussed. These oligomers are obtained by a simultaneous reaction of MDI, polycaprolactone and hydroxyethyl-acrylate. In order to obtain a high reaction conversion within the extruder, tin laurate catalyst was used at 90°C.
S. Coudray, J. P. Pascault, M. Taha
openaire   +1 more source

Corotating Twin-Screw Extrusion Reactive Extrusion-Devolatilization Model and Software

Polymer-Plastics Technology and Engineering, 2006
The modular corotating twin-screw extruder is an increasingly widely used polymer processing machine. This paper describes analyses of reactive extrusion and devolatilization in a modular corotating twin-screw extruder. The results of the analyses are intergrated into a comprehensive model and computer software for the modular corotating twin-screw ...
James L. White, Jongmin Keum, Hochul Jung, Kyunha Ban, Sughun Bumm   +4 more
openaire   +1 more source