scholarly journals Poly(Lactic Acid) Composites

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3586
Author(s):  
Mosab Kaseem
Keyword(s):  
Lactic Acid ◽  
Polylactic Acid ◽  
Material Properties ◽  
Biomedical Engineering ◽  
Scientific Community ◽  
Poly Lactic Acid ◽  
Polymer Science ◽  
Special Issue ◽  
Potential Applications ◽  
Scientists And Engineers

Polylactic acid-based materials have gained great interest within the scientific community due to their biodegradability, good performance, and suitability for a number of applications. Therefore, this Special Issue “Poly(lactic acid) Composites” is proposed to cover the important advances in poly (lactic acid) composites, ranging from their design, fabrication, and material properties to the potential applications of these materials. Therefore, we believe that the present Issue can convey beneficial information to scientists and engineers in numerous fields, including polymer science and biomedical engineering.

scholarly journals Bonding Wood Veneer with Biobased Poly(Lactic Acid) Thermoplastic Polyesters: Potential Applications for Consolidated Wood Veneer and Overlay Products

Fibers ◽  
2020 ◽  
Vol 8 (8) ◽  
pp. 50
Author(s):  
Warren J. Grigsby ◽  
Arpit Puri ◽  
Marc Gaugler ◽  
Jan Lüedtke ◽  
Andreas Krause
Keyword(s):  
Tensile Strength ◽  
Lactic Acid ◽  
Cold Water ◽  
Performance Criteria ◽  
Poly Lactic Acid ◽  
Wood Veneer ◽  
Pressing Temperature ◽  
Strength Performance ◽  
Potential Applications ◽  
Laminated Panels

This study reports on the use of poly(lactic acid) (PLA) as a renewable thermoplastic adhesive for laminated panels using birch, spruce, and pine veneers. Consolidated panels were prepared from veneer and PLA foils by hot-pressing from 140 to 180 °C to achieve minimum bondline temperatures. Evaluation of panel properties revealed that the PLA-bonded panels met minimum tensile strength and internal bond strength performance criteria. However, the adhesion interface which developed within individual bondlines varied with distinctions between hardwood and softwood species and PLA grades. Birch samples developed greater bondline strength with a higher pressing temperature using semi-crystalline PLA, whereas higher temperatures produced a poorer performance with the use of amorphous PLA. Panels formed with spruce or pine veneers had lower bondline performance and were also similarly distinguished by their pressing temperature and PLA grade. Furthermore, the potential for PLA-bonded laminated panels was demonstrated by cold water soak testing. Samples exhibiting relatively greater bondline adhesion had wet tensile strength values comparable to those tested in dry state. Our study outcomes suggest the potential for PLA bonding of veneers and panel overlays with the added benefits of being renewable and a no added formaldehyde system.

scholarly journals Effects of synthesised polyaniline (PAni) contents on the anti-static properties of PAni-based polylactic acid (PLA) films

RSC Advances ◽  
2020 ◽  
Vol 10 (65) ◽  
pp. 39693-39699
Author(s):  
Pei-Yi Wong ◽  
Sook-Wai Phang ◽  
Azizah Baharum
Keyword(s):  
Lactic Acid ◽  
Polymer Film ◽  
Polylactic Acid ◽  
Poly Lactic Acid ◽  
Static Properties ◽  
Biodegradable Poly

An anti-static polymer film was prepared using biodegradable poly(lactic acid) as a matrix and polyaniline (PAni) as an anti-static agent to eliminate accumulated static charges.

Formation the Polypyrrole / Chitosan / Polylactic Acid Microencapsules

2014 ◽  
Vol 881-883 ◽  
pp. 83-86 ◽  
Author(s):  
Hong Ye ◽  
Ying Liu ◽  
Xiang Hong Peng ◽  
Kun Wan ◽  
Feng Chen
Keyword(s):  
Electrical Conductivity ◽  
Acetic Acid ◽  
Lactic Acid ◽  
Polylactic Acid ◽  
Smooth Surface ◽  
Poly Lactic Acid ◽  
Spray Dried

The emulsion of chitosan in acetic acid aqueous and poly lactic acid in chloroform was spray-dried to obtain the chitosan/poly lactic acid microencapsules (CS-PLA). The polypyrrole / chitosan/ polylactic acid microencapsules were prepared by polymerization pyrrole on CS-PLA. The structures and the morphologies of microencapsules were characterized by FTIR, SEM, TGA and four probes technique. The results showed that multilayer polypyrrole were formation on the surface of CS-PLA microencapsules, the microencapsules had 3.0-8.0 μm diameters with smooth surface, and the electrical conductivity value was 1.03×10-3 S/cm.

scholarly journals Development of Poly(Lactic Acid) Filled with Basalt Fibres and Talc for Engineering Applications

2017 ◽  
Vol 885 ◽  
pp. 303-308 ◽  
Author(s):  
Tamás Tábi ◽  
Mauro Zarrelli
Keyword(s):  
Lactic Acid ◽  
Composite Materials ◽  
Renewable Resource ◽  
Poly Lactic Acid ◽  
Polymer Science ◽  
Nucleating Agents ◽  
Important Research ◽  
Basalt Fibre ◽  
Major Drawback ◽  
Research Fields

The development of renewable resource based and inherently biodegradable polymers as well as their composites are one of the most important research fields nowadays in polymer science. Poly (Lactic Acid) (PLA), as the most promising biodegradable polymer has the potential to replace even engineering composite materials by reinforcing it with natural plant fibres or mineral fibres like basalt. However, one major drawback is its low heat deflection temperature (HDT, ~55°C) caused by its slow crystallization kinetics and thus low crystallinity of the final product. This feature also retards the usage of PLA in composite materials for elevated temperature applications. At the same time, nucleating agents like talc can be used to enhance crystallinity and thus HDT. In this paper basalt fibre reinforced and talc filled PLA composites were prepared by extrusion followed by injection moulding. The results showed that by combining the stiffness increasing effect of basalt fibres as well as the crystallinity increasing effect of talc, a composite with both high mechanical properties and high HDT could be produced.

Characteristics of poly(lactic acid) reinforced composites with waste cotton

2011 ◽  
Vol 31 (6-7) ◽  
Author(s):  
Xiuju Zhang ◽  
Juncai Shen ◽  
Tingting Yang ◽  
Bihua Ye ◽  
Zhidan Lin ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Lactic Acid ◽  
Impact Strength ◽  
Flexural Strength ◽  
Polylactic Acid ◽  
Resource Utilization ◽  
Cotton Cloth ◽  
Poly Lactic Acid ◽  
Reinforced Composites ◽  
Crystallization Properties

Abstract In this study, waste cotton cloth (RC) was bonded with soluble starches as an adhesive, then dried, cut into particles and filled into polylactic acid (PLA) to achieve resource efficiency. The mechanical, thermal and crystallization properties of the composites were characterized. The results indicated that with the addition of RC, the tensile strength, impact strength and flexural strength of PLA composites improved. Also, the heat distortion temperatures increased slowly, indicating that RC filled into PLA can be turned back into useful items without the degradation of PLA composites. This is a good way to give direction to the resource utilization of waste clothing. The addition of RC could significantly reduce the spherulitic size of PLA.

scholarly journals Biocomposites based on polylactic acid and their thermal behavior after recycing

2014 ◽  
Vol 33 (2) ◽  
pp. 277 ◽  
Author(s):  
Vineta Srebrenkoska ◽  
Gordana Bogoeva Gaceva ◽  
Dimko Dimeski
Keyword(s):  
Lactic Acid ◽  
Flexural Strength ◽  
Polylactic Acid ◽  
Flexural Modulus ◽  
Rice Hull ◽  
Poly Lactic Acid ◽  
Mechanical And Thermal Properties ◽  
Mechanical Recycling ◽  
Neat Polymer ◽  
Rice Hulls

<p>In this study, rice-hull-filled poly(lactic acid) (PLA) biocomposites were prepared through the addition of 5 wt.% PLA-grafted-MA (CA) for the enhancement of adhesion between the polymer matrix and natural filler. The composites containing 30 wt.% rice hulls (RH) were prepared by compression molding, with particular attention given to the introduction of recycled PLA matrix, as well as to the possibility of the recycling and reuse of PLA/RH biocomposites. For all biocomposites, produced from neat polymer and RH and those produced after the recycling of PLA/RH composites, the mechanical and thermal properties were analyzed and compared to those of a commonly used thermoplastic based-polymer, polypropylene (PP), containing the same reinforcement. Thermal stability of biocomposites based on recycled PLA matrix and of the new composites produced from recycled ones was practically unchanged. Introduction of the recycled PLA matrix into biocomposites resulted in decreased flexural modulus and strengths of about 50%. Utilization of the mixture obtained after the thermal-mechanical recycling of the whole biocomposite resulted in a composite with slightly increased flexural modulus and decreased flexural strength.</p><p>The obtained results have shown that rice-hull-filled poly(lactic acid) biocomposites could be recycled and utilized for the production of new eco-materials with acceptable thermal and mechanical properties. Namely, the results for flexural strength and modulus of the recycled biocomposite samples are comparable to those of conventional formaldehyde wood medium density fiberboards used as construction elements for indoor applications.</p><br /><p><strong> </strong></p><p><strong>Keywords:</strong>  biocomposites, polylactic acid, polypropylene, rice hulls, compression moulding.</p>

scholarly journals DEGRADASI POLIBLEND POLI(ASAMLAKTAT-KO-ASAMGLIKOLAT) DENGAN POLI(ε-KAPROLAKTON) SECARA IN VITRO

2015 ◽  
Vol 2 (2) ◽  
pp. 174
Author(s):  
Tetty Kemala ◽  
Achmad Sjahriza ◽  
Hendra Adijuwana ◽  
Mardiana Hardianti
Keyword(s):  
Lactic Acid ◽  
Polylactic Acid ◽  
Intrinsic Viscosity ◽  
Phosphate Buffer ◽  
Glycolic Acid ◽  
Incubation Temperature ◽  
Human Life ◽  
Polyglycolic Acid ◽  
Poly Lactic Acid

 ABSTRACT  Polymer has many applications in human life, one of them is in the field of health. Polymer synthetics like polylactic acid (PLA), polyglycolic acid (PGA), poly(ε-caprolactone) (PCL), and poly(lactic acid-co-glycolic acid) (PLGA) were kind of polyesters that is many used in field   of health. Many researchers have already made research about degradation of PLA, PGA, PCL, and PLGA. However, there is no one doing research about degradation of combination between this two polymers, one of them is polyblend of  PLGA and PCL. Polyblend were made of four compositions, that were PLGA(90:10):PCL 3:1, PLGA(75:25):PCL 3:1, PLGA(90:10):PCL 5:1, and PLGA(75:25):PCL 5:1. Degradation was carried out for eight weeks by using phosphate buffer pH 7.4 and incubation temperature of 37°C. Degradation of the polymer was observed by mass remained, and intrinsic viscosity. The result showed that composition PLGA(75:25):PCL 5:1 was the fastest in degradation compared to other compositions. It was showed by the decrease in mass until 89.06% and the change in intrinsic viscosity until 20.13%. Keywords: PLGA, PCL   

scholarly journals Evaluation of Degradable Spun-Melt 100% Polylactic Acid Nonwoven Mulch Materials in a Greenhouse Environment

2013 ◽  
Vol 8 (4) ◽  
pp. 155892501300800 ◽  
Author(s):  
Larry C. Wadsworth ◽  
Douglas G. Hayes ◽  
Annette L. Wszelaki ◽  
Tommy L. Washington ◽  
Jeffrey Martin ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Lactic Acid ◽  
Mechanical Strength ◽  
Polylactic Acid ◽  
Poly Lactic Acid ◽  
High Mechanical Strength ◽  
Biobased Polymers ◽  
Agricultural Mulches ◽  
Complete Mineralization

The tendency of most commercially available plastic agricultural mulches to undergo only partial fragmentation with time leads to their long-term persistence in soil, resulting in potentially detrimental environmental hazards. Nonwovens composed of biobased polymers such as poly(lactic acid) (PLA) with micron-sized fibers may be potentially valuable for agricultural mulches due to their high mechanical strength and potential ability to undergo complete mineralization. To assess the performance of 100% PLA spunbond (SB) and meltblown (MB) mulches, and commercially available cellulosic mulch, a greenhouse bench study was conducted where the mulches were buried in soil augmented with either lime or compost for 10 and 29 wk to accelerate biodegradation and mineralization. At 10 and 29 wk, MB and SB mulches, respectively, lost considerable mechanical strength for all soil treatments while showing only minimal signs of loss in molecular weight.

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