Effect of Extrusion Screw Speed and Plasticizer Proportions
Effect of Extrusion Screw Speed and Plasticizer Proportions on the Rheological, Thermal, Mechanical, Morphological and Superficial Properties of PLA . Authors Jaime Gálvez 1 , Juan P Correa Aguirre 2 , Miguel A Hidalgo Salazar 2 , Bairo Vera Mondragón 1 , Elizabeth Wagner 1 , Carolina Caicedo 3 Affiliations
Effect of Extrusion Screw Speed and Plasticizer Proportions
In general, G″ and G′ decrease when the extrusion speed increases up to 20% of the plasticizer and 60 rpm. In this proportion, at higher speeds, the values of G′ with respect to G″ remain low; this due to the high molecular mobility and disentanglement of the polymer chains. Figure 2.
Effect of Extrusion Screw Speed and Plasticizer Proportions
The mixtures were obtained by varying the content of plasticizer (ATBC, 10-30% by weight), using a twin screw extruder as a processing medium for which a temperature profile with peak was...
Effect of Extrusion Screw Speed and Plasticizer Proportions
One of the critical processing parameters—the speed of the extrusion process for plasticized poly (lactic acid) (PLA)—was investigated in the presence of acetyl tributyl citrate (ATBC) as plasticizer.
Effect of Extrusion Screw Speed and Plasticizer Proportions
Figure 15. Micrographs obtained by scanning electron microscopy (SEM) with magnifications of 1700×for (a) PLA, (b) PLA60, PLA60-10 and PLA60-30, (c) PLA150, PLA150-10 and PLA150-30. - "Effect of Extrusion Screw Speed and Plasticizer Proportions on the Rheological, Thermal, Mechanical, Morphological and Superficial Properties of PLA"
- Does plasticizer efficiency affect extrusion speed?
- In terms of efficiency as plasticizers for PLA, it was observed that a higher content of plasticizer promotes lower T g values. In contrast, extrusion speeds had a lower incidence, slightly presenting a decrease in T g with low extrusion speeds.
- How does extrusion speed affect G′ and G′?
- In general, G″ and G′ decrease when the extrusion speed increases up to 20% of the plasticizer and 60 rpm. In this proportion, at higher speeds, the values of G′ with respect to G″ remain low; this due to the high molecular mobility and disentanglement of the polymer chains. Figure 2.
- What is the morphology of a PLA sample at a high extrusion speed?
- In the PLA sample processed at the highest extrusion speed (150 rpm, Figure 15 c), a continuous and rough phase morphology was observed, just like the neat PLA (see Figure S5, micrographs with magnifications of 500x).
- Can plasticizer be used to extrude PLA?
- Some studies report the extruded behavior of PLA at different speeds and process temperatures; however, the addition of plasticizer has not been considered [ 7 ]. Table 1. Thermal properties of PLA and PLA/ATBC.
- Does plasticizer increase the mobility of polymer chains?
- This phenomenon indicates that the addition of plasticizer and the increase in the processing speed increases the mobility of the polymer chains due to the plasticizing effect of ATBC and possibly due to the chain cut generated with the increase in the processing speed observed in the decrease of molecular weight ( Section 3.1 ). Figure 13.
- Who helped with extrusion processing?
- We thank Omar H. Ossa and Fernando González from the ASTIN, SENA, for their assistance with extrusion processing; Jhon E. Vélez from the USC, for their assistance with thermal analysis (TGA and DSC). The authors declare no conflict of interest.
