scholarly journals Study of Reactive Melt Processing Behavior of Externally Plasticized Cellulose Acetate in Presence of Isocyanate

Materials ◽  
2014 ◽  
Vol 7 (12) ◽  
pp. 7752-7769 ◽  
Author(s):  
Rafael Erdmann ◽  
Stephan Kabasci ◽  
Joanna Kurek ◽  
Stefan Zepnik
Keyword(s):  
Cellulose Acetate ◽  
Melt Processing ◽  
Reactive Melt

scholarly journals Grafted d/l-lactide to cellulose acetate by reactive melt processing: Its role as CA/PLA blend compatibilizer

2014 ◽  
Vol 57 ◽  
pp. 30-36 ◽  
Author(s):  
Robert Quintana ◽  
Olivier Persenaire ◽  
Yahia Lemmouchi ◽  
Leïla Bonnaud ◽  
Philippe Dubois
Keyword(s):  
Cellulose Acetate ◽  
Melt Processing ◽  
Reactive Melt

Recent advances in (reactive) melt processing of cellulose acetate and related biodegradable bio-compositions

2012 ◽  
Vol 3 (3) ◽  
pp. 591-595 ◽  
Author(s):  
Robert Quintana ◽  
Olivier Persenaire ◽  
Leila Bonnaud ◽  
Philippe Dubois
Keyword(s):  
Cellulose Acetate ◽  
Melt Processing ◽  
Recent Advances ◽  
Reactive Melt

Reactive melt processing of poly (L-lactide) in the presence of thermoplastic polyurethane and carboxylated carbon nanotubes

2019 ◽  
Vol 54 (24) ◽  
pp. 14961-14974 ◽  
Author(s):  
Omid Yousefzade ◽  
Jone M. Ugartemendia ◽  
Leire Sangroniz ◽  
Roberto Hernandez ◽  
Jordi Puiggali ◽  
...  
Keyword(s):  
Carbon Nanotubes ◽  
Thermoplastic Polyurethane ◽  
Melt Processing ◽  
Reactive Melt ◽  
Carboxylated Carbon Nanotubes

scholarly journals Substantial Effect of Water on Radical Melt Crosslinking and Rheological Properties of Poly(ε-Caprolactone)

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 491
Author(s):  
Angelica Avella ◽  
Rosica Mincheva ◽  
Jean-Marie Raquez ◽  
Giada Lo Re
Keyword(s):  
Rheological Properties ◽  
Mechanical Performance ◽  
Tensile Tests ◽  
Viscous Medium ◽  
Mechanical Analysis ◽  
Substantial Effect ◽  
Melt Processing ◽  
One Step ◽  
Reactive Melt ◽  
Newtonian Behavior

One-step reactive melt processing (REx) via radical reactions was evaluated with the aim of improving the rheological properties of poly(ε-caprolactone) (PCL). In particular, a water-assisted REx was designed under the hypothesis of increasing crosslinking efficiency with water as a low viscous medium in comparison with a slower PCL macroradicals diffusion in the melt state. To assess the effect of dry vs. water-assisted REx on PCL, its structural, thermo-mechanical and rheological properties were investigated. Water-assisted REx resulted in increased PCL gel fraction compared to dry REx (from 1–34%), proving the rationale under the formulated hypothesis. From dynamic mechanical analysis and tensile tests, the crosslink did not significantly affect the PCL mechanical performance. Dynamic rheological measurements showed that higher PCL viscosity was reached with increasing branching/crosslinking and the typical PCL Newtonian behavior was shifting towards a progressively more pronounced shear thinning. A complete transition from viscous- to solid-like PCL melt behavior was recorded, demonstrating that higher melt elasticity can be obtained as a function of gel content by controlled REx. Improvement in rheological properties offers the possibility of broadening PCL melt processability without hindering its recycling by melt processing.

scholarly journals The influence of melt mixing on the stability of cellulose acetate and its carbon nanotube composites

2016 ◽  
Vol 36 (9) ◽  
pp. 943-948 ◽  
Author(s):  
Ana Delgado-Lima ◽  
Maria C. Paiva ◽  
Ana Vera Machado
Keyword(s):  
Cellulose Acetate ◽  
Chain Scission ◽  
Polymer Processing ◽  
Melt Processing ◽  
Cellulose Derivatives ◽  
Melt Mixing ◽  
Nanotube Composites ◽  
Carbon Nanotube Composites ◽  
The Stability ◽  
Batch Mixer

Abstract Cellulose derivatives, such as cellulose acetate (CA), are commonly used due to their ease of processing. These polymers present interesting mechanical properties and biodegradability, but low thermal stability under melt processing conditions. Composites of carbon nanotubes (CNTs) and cellulose derivatives are expected to present enhanced properties, depending on the effect of nanotubes on polymer structure and thermal properties. This work aims to investigate the influence of melt mixing on the stability of CA and its CNT composites. Composites with 0 wt%, 0.1 wt% and 0.5 wt% CNTs, as received and functionalized with pyrrolidine groups, were prepared using a batch mixer and an extruder. Chain scission of CA occurred during processing, but the effect was considerably reduced in the presence of CNTs. The incorporation of small amounts of CNTs (with or without functionalization) decreased polymer degradation by thermomechanical effects induced during polymer processing.

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