Results 211 to 220 of about 24,694 (257)

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

Nanocomposites Prepared by Reactive Extrusion: Effect of the Polymer Reactive Groups

Macromolecular Reaction Engineering, 2013
AbstractThe interest in the development of polymer nanocomposites by reactive extrusion has been growing in the past years. This work aims to investigate the effect of the polymer reactive groups on chemical reaction extension and consequently, on the morphology of the nanocomposites. For that, two polymers, polypropylene grafted with maleic anhydride (
Oliveira, Manuel, Machado, A. V.
openaire   +2 more sources

Reactive extrusion of polystyrene/polyethylene blends

Polymer Engineering & Science, 1988
AbstractThe feasibility of inducing beneficial changes to polystyrene/polyethylene (PS/PE) blends via reactive extrusion processes is considered. Experiments have been conducted on 50:50 wt.% PS/PE blends that were treated with different levels of dicumyl peroxide and triallyl isocyanurate coupling agent.
Peter van Ballegooie, Alfred Rudin
openaire   +1 more source

Ram extrusion of reactive plastics

Russian Engineering Research, 2013
A system is proposed for the processing of highly filled thermosetting material. That system permits orientation of the fibrous filler over the length and cross section of the part. A wood-based thermosetting composite for the production of high-strength shaped components is also considered.
openaire   +1 more source

Reactive extrusion of polyolefin ternary blends

Journal of Applied Polymer Science, 1996
Reactive extrusion of polypropylene (PP)/ethylene-propylene-diene terpolymer (EPDM)/high-density polyethylene (PE) (80/10/10 by weight) blends were carried out using a corotating twin-screw extruder. The effects of peroxide and coagent concentrations and extruder rpm were studied in terms of rheological, morphological, thermal, and mechanical ...
Byung Kyu Kim, Chi Hoon Choi
openaire   +1 more source

Combined reactive extrusion–orientation of polyethylene

Polymer Engineering & Science, 1993
AbstractThe objective of this work is to combine reaction, extrusion, and orientation together in a process so as to provide product in a form which is not limited to fiber or film. Three coupled problems form the focus of the work: (i) devising a practical, continuous extrusion‐orientation method; (ii) generating low concentrations of free radicals in
D. Suwanda, S. T. Balke
openaire   +1 more source

Polypropylene degradation control during reactive extrusion

Journal of Applied Polymer Science, 2004
AbstractIn this work, a proportional‐integral‐derivative (PID) control scheme with two different tuning methods to control the degree of degradation of polypropylene (PP) during reactive extrusion is proposed. The concentration of dicumyl peroxide is taken as the manipulated variable.
Sheng‐Hong Pong, Chuan‐Pin Lu, Ming‐Chih Wang, Shih‐Hsuan Chiu   +3 more
openaire   +1 more source

Maleated thermoplastic starch by reactive extrusion

Carbohydrate Polymers, 2008
Novel maleated thermoplastic starch (MTPS) with both improved processing and reactivity useful in the melt-blending with biodegradable polyester was prepared through in situ reactive modification of thermoplastic starch (TPS) with maleic anhydride (MA) as esterification agent. Glycerol was used as plasticizer.
Jean-Marie Raquez, Yogaraj Nabar, Madhusudhan Srinivasan, Boo-Young Shin, Ramani Narayan, Philippe Dubois   +5 more
openaire   +1 more source

Reactive extrusion of zein with glyoxal

Journal of Applied Polymer Science, 2009
AbstractCross‐linked zein has been produced using glyoxal (GLY) as the cross‐linking reagent via reactive extrusion for the first time in a twin screw extruder using dilute sodium hydroxide as catalyst. Tri(ethylene glycol) was used as a plasticizer for various items.
Gordon W. Selling, Kristen Kruger Woods, Atanu Biswas, J. L. Willett   +3 more
openaire   +1 more source

Carboxymethylation of cellulose using reactive extrusion

Carbohydrate Polymers, 2012
Abstract Carboxymethyl cellulose was prepared using a continuous, reduced solvent, reactive extrusion process with a short reaction time. The effects of the amounts of NaOH (30 g, 40 g and 50 g), water:ethanol ratio (100%, 70%, 50%, 30% and 10% H2O) and their interactions on the physical, chemical and morphological properties of carboxymethyl ...
Pratik N. Bhandari, David D. Jones, Milford A. Hanna   +2 more
openaire   +1 more source