Simulation of thermal degradation, peroxide induced degradation, and maleation of polypropylene in a modular co-rotating twin screw extruder

1997 ◽  
Vol 37 (3) ◽  
pp. 576-589 ◽  
Author(s):  
Byoungjoo Kim ◽  
James L. White
Keyword(s):  
Thermal Degradation ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Twin Screw

scholarly journals Investigation of the Thermal and Hydrolytic Degradation of Polylactide during Autoclave Foaming

Polymers ◽  
2021 ◽  
Vol 13 (16) ◽  
pp. 2624
Author(s):  
Julia Dreier ◽  
Christian Brütting ◽  
Holger Ruckdäschel ◽  
Volker Altstädt ◽  
Christian Bonten
Keyword(s):  
Thermal Degradation ◽  
Hydrolytic Degradation ◽  
Reactive Extrusion ◽  
Foaming Properties ◽  
Twin Screw Extruder ◽  
Degradation Behavior ◽  
Screw Extruder ◽  
Melt Strength ◽  
Twin Screw ◽  
Good Potential

Polylactide (PLA) is one of the most important bioplastics worldwide and thus represents a good potential substitute for bead foams made of the fossil-based Polystyrene (PS). However, foaming of PLA comes with a few challenges. One disadvantage of commercially available PLA is its low melt strength and elongation properties, which play an important role in foaming. As a polyester, PLA is also very sensitive to thermal and hydrolytic degradation. Possibilities to overcome these disadvantages can be found in literature, but improving the properties for foaming of PLA as well as the degradation behavior during foaming have not been investigated yet. In this study, reactive extrusion on a twin-screw extruder is used to modify PLA in order to increase the melt strength and to protect it against thermal degradation and hydrolysis. PLA foams are produced in an already known process from the literature and the influence of the modifiers on the properties is estimated. The results show that it is possible to enhance the foaming properties of PLA and to protect it against hydrolysis at the same time.

Effect of Jute Fiber’s Thermal Degradation on the Fiber Strength and its Polymer Composites

2015 ◽  
Vol 1110 ◽  
pp. 7-12
Author(s):  
Takayasu Fujiura ◽  
Ryosuke Nakamura ◽  
Tatsuya Tanaka ◽  
Yoshihiko Arao
Keyword(s):  
Tensile Strength ◽  
Thermal Degradation ◽  
Fiber Strength ◽  
Tensile Tests ◽  
Jute Fiber ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Test Pieces ◽  
Twin Screw ◽  
Molded Sample

In this study, we investigated the effect of jute fiber’s thermal degradation on fiber strength and its polymer composite. First, we conducted a tensile strength test of a single jute fiber. Next, polyethylene and jute fibers were mixed by twin-screw extruder to make pellets. After making pellets, we used injection molding machine to make the test pieces. Tensile tests were conducted using injection molded sample. As a result, in the experiment of the single fibers, tensile strength of jute fiber monotonically decreased with increasing drying temperature. In case of composite, the tensile strength of molded sample increased with increasing control temperature in twin screw extrude in a range between 150°C ~ 220°C. When the temperature of twin-screw extruder was controlled above 300°C, pellets were burned black by thermal degradation and couldn’t fabricate the test piece.

A Comparative Study on the Effect of Adiabatic Extrusion by Twin-Screw Extruder to the Crystallization Pattern and Thermal Behavior of Polyamide 6/C20A Nanocomposites

2013 ◽  
Vol 756 ◽  
pp. 135-142 ◽  
Author(s):  
Zulhelmi Ismail ◽  
Kamal Yusoh
Keyword(s):  
Differential Scanning Calorimetry ◽  
Thermal Degradation ◽  
Polyamide 6 ◽  
Combination Effect ◽  
Gravimetric Analysis ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Scanning Calorimetry ◽  
Mass Losses ◽  
Twin Screw

The performance of an adiabatic extrusion in minimizing the risk of thermal degradation for PA6/C20A nanocomposites was investigated in this paper. The screw speed of twin-screw extruder was maintained at constant value of 100 RPM while the clay loadings C20A were varied between 1 wt %, 3wt % and 5 wt % respectively.Thermal gravimetric analysis was used to characterize the thermal property of polyamide6/C20A-nanocomposites and the crystallization pattern was thoroughly examined via the application of differential scanning calorimetry. The time taken for 10 wt.% mass losses of majority adiabatic extruded samples was observed to be longer as compared to the conventional extruded PA6/C20A samples. The combination effect of adiabatic extrusion and nanoclay presence in the PA6-matrix has managed to increase thermal resistant of PA6. The crystallinity grade for each of the samples with different loading of C20A. however has not diversed in value since the index of crystallinity (Xc) remains independent of C20-volume althoughconventional/adiabatic setting of extruder could possibly have greater effect on the crystalline feature of PA6/C20A nanocomposites.

Reactive Blending in a Twin Screw Extruder

1996 ◽  
Vol 11 (2) ◽  
pp. 139-146 ◽  
Author(s):  
A. De Loor ◽  
P. Cassagnau ◽  
A. Michel ◽  
L. Delamare ◽  
B. Vergnes
Keyword(s):  
Twin Screw Extruder ◽  
Reactive Blending ◽  
Screw Extruder ◽  
Twin Screw
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