DETERMINATION OF THE VISCOSITY TEMPERATURE COEFFICIENT (β) AND PSEUDOPLASTIC INDEX (n) OF POLY(LACTID ACID) (PLA)

Poly(lactic acid) (PLA) is one of the most important ecological thermoplastics due to its good mechanical properties. In light of this, investigations related to the effects of PLA processing parameters are important as they affect the final product performance. This work aimed to determine the viscosity-temperature coefficient (β) and pseudoplastic index (n) of PLA and estimate its degradation rate during processing using an internal mixer. The viscosity coefficient was determined applying different processing temperatures at the same rotors rotation rate, which allowed estimating β = 0.048 ◦C−1. PLA’s pseudoplastic index (n) under the tested conditions suggested a value of approximately 0.71. PLA’s degradation rate was around 4% under rotor rate of 120 rpm and temperature of 190 ◦C.

[1]  S. Su.  Compatibilization, processing and characterization of poly(butylene adipate terephthalate)/polylactide (PBAT/PLA) blends , 2022, Materials Research Express.

[2]  E. Araújo,et al.  Effect of kaolin waste annealing on the structural and thermal behavior of poly(ε−caprolactone) , 2022, MOMENTO.

[3]  E. Araújo,et al.  Tailoring Poly(lactic acid) (PLA) Properties: Effect of the Impact Modifiers EE-g-GMA and POE-g-GMA , 2021, Polymers.

[4]  M. Mendoza-Duarte,et al.  Stiff-Elongated Balance of PLA-Based Polymer Blends , 2021, Polymers.

[5]  E. Araújo,et al.  Production of Eco-Sustainable Materials: Compatibilizing Action in Poly (Lactic Acid)/High-Density Biopolyethylene Bioblends , 2021, Sustainability.

[6]  Sivagnanamani Gnanamani Sankaravel,et al.  In vitro and mechanical characterization of PLA /egg shell biocomposite scaffold manufactured using f used deposition modeling technology for tissue engineering applications , 2021, Polymer Composites.

[7]  M. Misra,et al.  Durable Polylactic Acid (PLA)-Based Sustainable Engineered Blends and Biocomposites: Recent Developments, Challenges, and Opportunities , 2021, ACS Engineering Au.

[8]  Hans-Josef Endres,et al.  Plastics in the context of the circular economy and sustainable plastics recycling: Comprehensive review on research development, standardization and market , 2021 .

[9]  E. Araújo,et al.  Reactive processing of PA6/EPDM‐MA blends as modifier for application and development of high‐performance polypropylene , 2021, Journal of Vinyl and Additive Technology.

[10]  Jafar Khademzadeh Yeganeh,et al.  Synergistic toughening of poly(lactic acid)/poly(ethylene vinyl acetate) ( PLA / EVA ) by dynamic vulcanization and presence of hydrophobic nanoparticles , 2021, Polymers for Advanced Technologies.

[11]  E. Araújo,et al.  Annealing Effect on Pla/Eva Blends Performance , 2021, Journal of Polymers and the Environment.

[12]  E. Araújo,et al.  Effect of injection parameters on the thermal, mechanical and thermomechanical properties of polycaprolactone (PCL) , 2021, Journal of Elastomers & Plastics.

[13]  M. McManus,et al.  Developments in the life cycle assessment of chemical recycling of plastic waste – A review , 2021 .

[14]  P. K. Penumakala,et al.  Mechanical and electrical properties of three‐dimensional printed polylactic acid–graphene–ca rbon nanofiber composites , 2021 .

[15]  E. Araújo,et al.  Feasibility of Manufacturing Disposable Cups using PLA/PCL Composites Reinforced with Wood Powder , 2021, Journal of Polymers and the Environment.

[16]  M. Nowacka,et al.  Influence of a bark-filler on the properties of PLA biocomposites , 2021, Journal of Materials Science.

[17]  Hasti Bizhani,et al.  Toward morphology development and impact strength of Co-continuous supertough dynamically vulcanized rubber toughened PLA blends: Effect of sulfur content , 2021 .

[18]  E. Araújo,et al.  Annealing efficacy on PLA. Insights on mechanical, thermomechanical and crystallinity characters , 2021 .

[19]  T. S. Alves,et al.  Characterization of Poly(Ethylene Terephthalate) by Torque Rheometry , 2021, Materials Research.

[20]  B. G. Soares,et al.  Epoxidized cardanol-based prepolymer as promising biobased compatibilizing agent for PLA/PBAT blends , 2021 .

[21]  Emmanuel O. Ogunsona,et al.  Thin-structured and compostable wood fiber-polymer biocomposites: Fabrication and performance evaluation , 2021 .

[22]  P. Olupot,et al.  Flame retardancy and thermal stability of agricultural residue fiber‐reinforced polylactic acid: A Review , 2020 .

[23]  M. Shaver,et al.  Mechanical Recycling of Packaging Plastics: A Review. , 2020, Macromolecular rapid communications.

[24]  M. Mariatti,et al.  Synergized high‐load bearing bone replacement composite from poly(lactic acid) reinforced with hydroxyapatite/glass fiber hybrid filler—Mechanical and dynamic mechanical properties , 2020 .

[25]  E. Araújo,et al.  From Disposal to Technological Potential: Reuse of Polypropylene Waste from Industrial Containers as a Polystyrene Impact Modifier , 2020, Sustainability.

[26]  A. Behera,et al.  A study on efficient microbial biodegradation of cellulose based jute composite , 2020 .

[27]  E. Araújo,et al.  Blends with technological potential of copolymer polypropylene with polypropylene from post-consumer industrial containers , 2019, Materials Research Express.

[28]  J. Barbosa,et al.  Bionanocomposites of PLA/PBAT/organophilic clay: preparation and characterization , 2019, Polímeros.

[29]  Raquel M Santos,et al.  Polycaprolactone/babassu compounds: Rheological, thermal, and morphological characteristics , 2019 .

[30]  Yêda M. B. Almeida,et al.  Polycaprolactone matrix composites reinforced with brown coir: Rheological, crystallization, and mechanical behavior , 2018, Polymer Composites.

[31]  L. H. Carvalho,et al.  Degradation during processing of vegetable fiber compounds based on PBAT/PHB blends , 2018, Polymer Testing.

[32]  L. H. Carvalho,et al.  Rheological and thermal characterization of PCL/PBAT blends , 2018, Polymer Bulletin.

[33]  R. M. R. Wellen,et al.  Comportamento reológico do Bio-PE e do PCL na presença do PEgAA e PEgMA , 2017 .

[34]  L. H. Carvalho,et al.  Degradation during processing in poly(butylene adipate-co-terephthalate)/vegetable fiber compounds estimated by torque rheometry , 2016 .

[35]  T. S. Alves,et al.  Process simulation of laboratory internal mixers , 2016 .

[36]  V. Massardier-Nageotte,et al.  Biobased additive plasticizing Polylactic acid (PLA) , 2015 .

[37]  Ana Rita Morales,et al.  Estudo do comportamento térmico e mecânico do PLA modificado com aditivo nucleante e modificador de impacto , 2014 .