scholarly journals Influence of novel screw elements on the reactive extrusion of low density polyethylene grafted with maleic anhydride in co-rotating twin screw extruder

2019 ◽  
Author(s):  
Ma Xiuqing ◽  
Zhai Wenbin ◽  
Liu Min
Keyword(s):  
Maleic Anhydride ◽  
Reactive Extrusion ◽  
Low Density Polyethylene ◽  
Low Density ◽  
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.

Compatibilization Efficiency of Reactively Modified Poly(butylene succinate) as a Compatibilizer for Poly(butylene succinate) Composites

2015 ◽  
Vol 1119 ◽  
pp. 288-291 ◽  
Author(s):  
Vanalee Tansiri ◽  
Pranut Potiyaraj
Keyword(s):  
Thermal Properties ◽  
Maleic Anhydride ◽  
Glycidyl Methacrylate ◽  
Spectroscopic Analysis ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Melt Viscosity ◽  
Butylene Succinate ◽  
Grafting Reactions ◽  
Twin Screw

The modified poly (butylene succinate) (PBS), namely, PBS-g-MA and PBS-g-GMA were prepared in order to be used as a compatibilizer for PBS composites. The grafting of maleic anhydride (MA) or glycidyl methacrylate (GMA) onto PBS was carried out using a twin-screw extruder. The grafting reactions were confirmed by spectroscopic analysis. Comparing with MA, it was found that GMA can be effectively grafted on PBS. The PBS-g-GMA was successfully used for PBS composites to enhance thermal properties. Furthermore, it was found that the incorporation of compatibilizer increased the melt viscosity of PBS composites.

Natural Rubber Based Compatibilizer Prepared in Twin Screw Extruder: Optimization Percentage of Grafted Maleic Anhydride Using Experimental Design

2016 ◽  
Vol 864 ◽  
pp. 13-17 ◽  
Author(s):  
Onny Ujianto ◽  
Marzuki ◽  
Fitri Ayu Radini
Keyword(s):  
Experimental Design ◽  
Maleic Anhydride ◽  
Natural Rubber ◽  
Acid Group ◽  
Ftir Spectra ◽  
Twin Screw Extruder ◽  
Screw Extruder ◽  
Spectra Analysis ◽  
Ring Opening Reaction ◽  
Twin Screw

Maleic anhydride grafted natural rubber compatibilizer was prepared in molten state using twin screw extruder. Amount of maleic anhydride and initiator, as well as screw rotation were varied according to Box-Behnken experimental design. Titration of acid group from the anhydride function and FTIR spectra analysis were carried out as quantitative and qualitative analysis of grafted MA, respectively. The results showed that the percentages of grafted MA for all samples were ranged from 1.31 to 5.36%. The optimum conditions are predicted at 14.4 phr of MA level, 0.41 phr of BPO level, and 71 rpm screw rotation giving 5.39 ± 0.16% of grafted MA. FTIR spectra showed that the MA and carbonyl functional group were found in the compatibilizer suggested the presence of grafted MA and ring opening reaction.

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