Influence of process parameters on the characteristics of oxygen‐releasing poly (lactic acid) microparticles: A multioptimization strategy

2020 ◽  
Author(s):  
Sara Nejati ◽  
Reza Karimi‐Soflou ◽  
Akbar Karkhaneh
Keyword(s):  
Lactic Acid ◽  
Process Parameters ◽  
Poly Lactic Acid ◽  
Influence Of Process Parameters

Modeling and predicting the tensile strength of poly (lactic acid)/graphene nanocomposites by using support vector regression

2016 ◽  
Vol 30 (10) ◽  
pp. 1650052
Author(s):  
W. D. Cheng ◽  
C. Z. Cai ◽  
Y. Luo ◽  
Y. H. Li ◽  
C. J. Zhao
Keyword(s):  
Tensile Strength ◽  
Lactic Acid ◽  
Support Vector Regression ◽  
Process Parameters ◽  
Poly Lactic Acid ◽  
Percentage Error ◽  
Support Vector ◽  
Graphene Nanocomposites ◽  
Absolute Percentage Error ◽  
Rsm Model

According to an experimental dataset under different process parameters, support vector regression (SVR) combined with particle swarm optimization (PSO) for its parameter optimization was employed to establish a mathematical model for prediction of the tensile strength of poly (lactic acid) (PLA)/graphene nanocomposites. Four variables, while graphene loading, temperature, time and speed, were employed as input variables, while tensile strength acted as output variable. Using leave-one-out cross validation test of 30 samples, the maximum absolute percentage error does not exceed 1.5%, the mean absolute percentage error (MAPE) is only 0.295% and the correlation coefficient [Formula: see text] is as high as 0.99. Compared with the results of response surface methodology (RSM) model, it is shown that the estimated errors by SVR are smaller than those achieved by RSM. It revealed that the generalization ability of SVR is superior to that of RSM model. Meanwhile, multifactor analysis is adopted for investigation on significances of each experimental factor and their influences on the tensile strength of PLA/graphene nanocomposites. This study suggests that the SVR model can provide important theoretical and practical guide to design the experiment, and control the intensity of the tensile strength of PLA/graphene nanocomposites via rational process parameters.

The Influence of Process Parameters on Lactic Acid Fermentation in Laboratory Scale Fermenter

2006 ◽  
Vol 6 (10) ◽  
pp. 2287-2291 ◽  
Author(s):  
Maizirwan Mel ◽  
Mohd Ismail Abdul Ka . ◽  
Parveen Jamal . ◽  
Mohamad Ramlan Moham . ◽  
Ruzi Aini Zakaria .
Keyword(s):  
Lactic Acid ◽  
Process Parameters ◽  
Lactic Acid Fermentation ◽  
Laboratory Scale ◽  
Acid Fermentation ◽  
Influence Of Process Parameters

scholarly journals Rheology, Morphology and Thermal Properties of a PLA/PHB/Clay Blend Nanocomposite: The Influence of Process Parameters

2021 ◽  
Author(s):  
Alessandra D’Anna ◽  
Rossella Arrigo ◽  
Alberto Frache
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Relaxation Mechanism ◽  
Poly Lactic Acid ◽  
Interfacial Region ◽  
Shear Stresses ◽  
Rheological Characterization ◽  
Influence Of Process Parameters ◽  
Preferential Localization ◽  
Twin Screw

AbstractThe effect of process parameters on the final properties of a poly-lactic acid (PLA) and polyhydroxybutyrate (PHB) polymer blend filled with nanoclays was evaluated. To this aim, the nanofilled blend was processed in a co-rotating twin screw extruder, considering three different screw profiles and different values of the screw rotation speed, and the thermal and thermo-mechanical properties of the so-obtained materials were investigated. Furthermore, XRD analyses, SEM observations and rheological characterization were exploited to infer the coupled effect of the process parameters and nanoclay presence on the microstructure of the filled blend. Preliminary thermodynamic calculations allowed predicting the preferential localization of the nanoclay in the interfacial region between the polymeric phases. The relaxation mechanism of the particles of the dispersed phase in nanofilled blend processed, by rheological measurements, is not fully completed due to an interaction between polymer ad filler in the interfacial region with a consequent modification of the blend morphology and, specifically, a development of an enhanced microstructure. Therefore, by varying the screw configuration, particularly the presence of backflow and distribution elements in the screw profile, high shear stresses are induced during the processing able to allow a better interaction between polymers and clay. This finding also occurs in the thermo-mechanical properties of material, as an improvement of storage modulus up to 20% in filled blend processed with a specific screw profile. Otherwise, the microstructure of filled blend processed with different screw speed is similar, according to the other characterizations where no remarkable alterations of materials were detected.

Preparation of poly(lactic acid) fiber by dry–jet–wet spinning. II. Effect of process parameters on fiber properties

2006 ◽  
Vol 101 (6) ◽  
pp. 3774-3780 ◽  
Author(s):  
Bhuvanesh Gupta ◽  
Nilesh Revagade ◽  
Nishat Anjum ◽  
Björn Atthoff ◽  
Jöns Hilborn
Keyword(s):  
Lactic Acid ◽  
Process Parameters ◽  
Wet Spinning ◽  
Poly Lactic Acid ◽  
Fiber Properties

Evaluating the deposition quality of parts produced by an open-source 3D printer

2017 ◽  
Vol 23 (4) ◽  
pp. 796-803 ◽  
Author(s):  
Leonardo Santana ◽  
Carlos Henrique Ahrens ◽  
Aurélio da Costa Sabino Netto ◽  
Cassiano Bonin
Keyword(s):  
Lactic Acid ◽  
Process Parameters ◽  
Poly Lactic Acid ◽  
Processing Conditions ◽  
Mass Measurements ◽  
Content Type ◽  
Factors Affecting ◽  
Flexural Tests ◽  
Feedstock Material

Purpose The purpose of this study is to analyze the factors affecting the deposition of parts manufactured in poly(lactic acid) with variations in print speed and extrusion temperature. Specimens were analyzed through optical microscopy, mass measurements and flexural tests. The extruder-head evaluation consisted of monitoring the feedstock material displacement on entering the system during deposition under different processing conditions. Design/methodology/approach To analyze the factors affecting the deposition, parts were manufactured in poly(lactic acid) with variations in print speed and extrusion temperature. Specimens were analyzed through optical microscopy, mass measurements and flexural tests. The extruder-head evaluation consisted of monitoring the feedstock material displacement on entering the system during deposition under different processing conditions. Findings The results showed low repeatability in the manufacturing of parts, as significant variations in the evaluated responses were found for specimens built under the same process parameters. The main cause for this effect was deposition failure, owing to filament slippage in the extruder head hobbed pulley. Practical implications The results found should alert users to the fact that performance tests need to be carried out on every subcomponent of the equipment before conducting experiments on printing parameters. The components of the equipment can influence the final quality of the parts obtained as much as the building parameters and this influence can be significant enough to overlap with that of the process parameters. Originality/value The effect of slippage on the deposition quality was quantified and the command loss in the machine control board was identified.

Sign in / Sign up

Export Citation Format

Share Document