scholarly journals Analysis of Gas Permeability Characteristics of Poly(Lactic Acid)/Poly(Butylene Succinate) Nanocomposites

2012 ◽  
Vol 2012 ◽  
pp. 1-11 ◽  
Author(s):  
Amita Bhatia ◽  
Rahul K. Gupta ◽  
Sati N. Bhattacharya ◽  
Hyoung Jin Choi
Keyword(s):  
Lactic Acid ◽  
Gas Permeability ◽  
Average Particle Size ◽  
Barrier Property ◽  
Morphological Properties ◽  
Poly Lactic Acid ◽  
Clay Nanocomposites ◽  
Average Particle ◽  
Butylene Succinate ◽  
Morphological Studies

Gas permeability and morphological properties of nanocomposites prepared by the mixing of poly(lactic acid) (PLA), poly(butylene succinate) (PBS), and clay was investigated. While the composition of PLA and PBS polymers was fixed as 80% and 20% by weight, respectively, for all the nanocomposites, clay contents varied from 1 to 10 wt%. From the morphological studies using both wide angle X-ray diffraction and transmission electron microscopy, the nanocomposite having 1 wt% of clay was considered to have a mixed morphology of intercalated and delaminated structure, while some clusters or agglomerated particles were detected for nanocomposites having 3 and more than 3 wt% of clay content. However, the average particle size of the dispersed PBS phase was reduced significantly from 7 μm to 30–40 nm with the addition of clay in the blend. The oxygen barrier property was improved significantly as compared to the water vapor. A model based on gas barrier property was used for the validation of the oxygen relative permeabilities of PLA/PBS/clay nanocomposites. PLA/PBS/clay nanocomposites validated the Bharadwaj model up to 3 wt% of clay contents only, while for nanocomposites of higher clay contents the Bharadwaj model was invalid due to the clusters and agglomerates formed.

scholarly journals Paclitaxel Magnetic Core–Shell Nanoparticles Based on Poly(lactic acid) Semitelechelic Novel Block Copolymers for Combined Hyperthermia and Chemotherapy Treatment of Cancer

Pharmaceutics ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 213 ◽  
Author(s):  
Evi Christodoulou ◽  
Maria Nerantzaki ◽  
Stavroula Nanaki ◽  
Panagiotis Barmpalexis ◽  
Kleoniki Giannousi ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Lactic Acid ◽  
Block Copolymers ◽  
Polymeric Nanoparticles ◽  
Average Particle Size ◽  
In Vitro Release ◽  
Poly Lactic Acid ◽  
Average Particle ◽  
Chemotherapy Treatment ◽  
Cytotoxicity Studies

Magnetic hybrid inorganic/organic nanocarriers are promising alternatives for targeted cancer treatment. The present study evaluates the preparation of manganese ferrite magnetic nanoparticles (MnFe2O4 MNPs) encapsulated within Paclitaxel (PTX) loaded thioether-containing ω-hydroxyacid-co-poly(d,l-lactic acid) (TEHA-co-PDLLA) polymeric nanoparticles, for the combined hyperthermia and chemotherapy treatment of cancer. Initially, TEHA-co-PDLLA semitelechelic block copolymers were synthesized and characterized by 1H-NMR, FTIR, DSC, and XRD. FTIR analysis showed the formation of an ester bond between the two compounds, while DSC and XRD analysis showed that the prepared copolymers were amorphous. MnFe2O4 MNPs of relatively small crystallite size (12 nm) and moderate saturation magnetization (64 emu·g−1) were solvothermally synthesized in the sole presence of octadecylamine (ODA). PTX was amorphously dispersed within the polymeric matrix using emulsification/solvent evaporation method. Scanning electron microscopy along with energy-dispersive X-ray spectroscopy and transmission electron microscopy showed that the MnFe2O4 nanoparticles were effectively encapsulated within the drug-loaded polymeric nanoparticles. Dynamic light scattering measurements showed that the prepared nanoparticles had an average particle size of less than 160 nm with satisfactory yield and encapsulation efficiency. Diphasic PTX in vitro release over 18 days was observed while PTX dissolution rate was mainly controlled by the TEHA content. Finally, hyperthermia measurements and cytotoxicity studies were performed to evaluate the magnetic response, as well as the anticancer activity and the biocompatibility of the prepared nanocarriers.

Biodegradable poly (lactic acid)/poly (butylene succinate) fibers with high elongation for health care products

2017 ◽  
Vol 88 (15) ◽  
pp. 1735-1744 ◽  
Author(s):  
Elwathig AM Hassan ◽  
Salah Eldin Elarabi ◽  
You Wei ◽  
Muhuo Yu
Keyword(s):  
Lactic Acid ◽  
Melt Spinning ◽  
Strength Loss ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Morphological Studies ◽  
Biodegradable Poly ◽  
Spinning Process ◽  
High Elongation ◽  
The Impact

Poly (lactic acid)/poly (butylene succinate) (PLA/PBS) blend fibers with high miscibility and improved elongation with comparable mechanical strength were fabricated using the melt spinning process in order to reduce the impact on the environment by long-lasting plastics-based composites. The PLA/PBS blend fibers produced in different ratios have revealed high miscibility, which has been confirmed by morphological studies. The thermal properties showed the melting temperature of PLA at 167.13℃ and PLA/PBS blends at 169.18℃, and an increased content of PBS in blends also led to improved crystallinity. Importantly, during tensile testing, it is observed that the fracture behavior of the specimen changed from brittle fracture of neat PLA to ductile fracture of the blends, as demonstrated by the significant increase in the elongation at break with comparable tensile strength and modulus. Furthermore, the washing fastness, rubbing fastness, exhaustion values, strength loss, and shade depth ( K/ S value) for the knitted and dyed fibers were explored. It was found that the exhaustion and K/ S value increased when the temperature increased, but the strength decreased. The exhaustion and K/ S value of PLA/PBS blend fabrics improved compared to pure PLA fabric, with excellent washing and rubbing fastness.

Mechanical, Thermal and Morphological Properties of Poly(butylene Succinate) Filled with Bio-Functional Filler from Eggshell Waste

2013 ◽  
Vol 747 ◽  
pp. 72-75 ◽  
Author(s):  
Wanikorn Buakaew ◽  
Ruksakulpiwat Yupaporn ◽  
Nitinat Suppakarn ◽  
Wimonlak Sutapun
Keyword(s):  
Average Particle Size ◽  
Decomposition Temperature ◽  
Morphological Properties ◽  
Degree Of Crystallinity ◽  
Average Particle ◽  
Composite Matrix ◽  
Butylene Succinate ◽  
Eggshell Waste ◽  
Break Yield ◽  
Reinforcing Filler

In this work, calcium carbonate derived from eggshell, in a form of eggshell powder (ESP) with an average particle size of 13.96 μm, was used as bio-reinforcing filler for poly (butylene succinate), (PBS). The effect of ESP content on mechanical, thermal, and morphological properties of ESP filled PBS was investigated. The ESP/PBS composites were prepared at various ESP contents of 10, 20, 30 and 40 wt.%. It was found that incorporation of ESP into PBS matrix resulted in an improvement of Youngs modulus but it resulted in a decrease of tensile stress at break, yield strength and impact strength of the composite. In addition, increasing ESP content did not significantly influence decomposition temperature and melting temperature of PBS matrix. On the other hand, with increasing ESP content, crystallization temperature of the composite decreased but degree of crystallinity increased. Fracture surface morphology of the PBS composites obtained from scanning electron microscope indicated agglomeration and poor distribution of ESP within the composite matrix. Partial adhesion between ESP surface and PBS matrix was observed as well.

Biodegradable poly(lactic acid)/poly(butylene succinate)/wood flour composites: Physical and morphological properties

2016 ◽  
Vol 38 (12) ◽  
pp. 2841-2851 ◽  
Author(s):  
Saowaroj Chuayjuljit ◽  
Chutima Wongwaiwattanakul ◽  
Phasawat Chaiwutthinan ◽  
Pattarapan Prasassarakich
Keyword(s):  
Lactic Acid ◽  
Wood Flour ◽  
Morphological Properties ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Biodegradable Poly

scholarly journals Binary Green Blends of Poly(lactic acid) with Poly(butylene adipate-co-butylene terephthalate) and Poly(butylene succinate-co-butylene adipate) and Their Nanocomposites

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2489
Author(s):  
Serena Coiai ◽  
Maria Laura Di Lorenzo ◽  
Patrizia Cinelli ◽  
Maria Cristina Righetti ◽  
Elisa Passaglia
Keyword(s):  
Lactic Acid ◽  
Mechanical Performance ◽  
Impact Resistance ◽  
Barrier Properties ◽  
Morphological Properties ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Butylene Terephthalate ◽  
Green Materials ◽  
The Impact

Poly(lactic acid) (PLA) is the most widely produced biobased, biodegradable and biocompatible polyester. Despite many of its properties are similar to those of common petroleum-based polymers, some drawbacks limit its utilization, especially high brittleness and low toughness. To overcome these problems and improve the ductility and the impact resistance, PLA is often blended with other biobased and biodegradable polymers. For this purpose, poly(butylene adipate-co-butylene terephthalate) (PBAT) and poly(butylene succinate-co-butylene adipate) (PBSA) are very advantageous copolymers, because their toughness and elongation at break are complementary to those of PLA. Similar to PLA, both these copolymers are biodegradable and can be produced from annual renewable resources. This literature review aims to collect results on the mechanical, thermal and morphological properties of PLA/PBAT and PLA/PBSA blends, as binary blends with and without addition of coupling agents. The effect of different compatibilizers on the PLA/PBAT and PLA/PBSA blends properties is here elucidated, to highlight how the PLA toughness and ductility can be improved and tuned by using appropriate additives. In addition, the incorporation of solid nanoparticles to the PLA/PBAT and PLA/PBSA blends is discussed in detail, to demonstrate how the nanofillers can act as morphology stabilizers, and so improve the properties of these PLA-based formulations, especially mechanical performance, thermal stability and gas/vapor barrier properties. Key points about the biodegradation of the blends and the nanocomposites are presented, together with current applications of these novel green materials.

scholarly journals Poly(Lactic Acid)–Poly(Butylene Succinate)–Sugar Beet Pulp Composites; Part I: Mechanics of Composites with Fine and Coarse Sugar Beet Pulp Particles

Polymers ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2531
Author(s):  
Rodion Kopitzky
Keyword(s):  
Mechanical Properties ◽  
Lactic Acid ◽  
Sugar Beet ◽  
Cell Structure ◽  
Sugar Beet Pulp ◽  
Poly Lactic Acid ◽  
Butylene Succinate ◽  
Fracture Patterns ◽  
Beet Pulp ◽  
The Impact

Sugar beet pulp (SBP) is a residue available in large quantities from the sugar industry, and can serve as a cost-effective bio-based and biodegradable filler for fully bio-based compounds based on bio-based polyesters. The heterogeneous cell structure of sugar beet suggests that the processing of SBP can affect the properties of the composite. An “Ultra-Rotor” type air turbulence mill was used to produce SBP particles of different sizes. These particles were processed in a twin-screw extruder with poly(lactic acid) (PLA) and poly(butylene succinate) (PBS) and fillers to granules for possible marketable formulations. Different screw designs, compatibilizers and the use of glycerol as a thermoplasticization agent for SBP were also tested. The spherical, cubic, or ellipsoidal-like shaped particles of SBP are not suitable for usage as a fiber-like reinforcement. In addition, the fineness of ground SBP affects the mechanical properties because (i) a high proportion of polar surfaces leads to poor compatibility, and (ii) due to the inner structure of the particulate matter, the strength of the composite is limited to the cohesive strength of compressed sugar-cell compartments of the SBP. The compatibilization of the polymer–matrix–particle interface can be achieved by using compatibilizers of different types. Scanning electron microscopy (SEM) fracture patterns show that the compatibilization can lead to both well-bonded particles and cohesive fracture patterns in the matrix. Nevertheless, the mechanical properties are limited by the impact and elongation behavior. Therefore, the applications of SBP-based composites must be well considered.

The effect of poly(ethylene glycol) as plasticizer in blends of poly(lactic acid) and poly(butylene succinate)

2015 ◽  
Vol 133 (8) ◽  
pp. n/a-n/a ◽  
Author(s):  
Weraporn Pivsa-Art ◽  
Kazunori Fujii ◽  
Keiichiro Nomura ◽  
Yuji Aso ◽  
Hitomi Ohara ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Ethylene Glycol ◽  
Poly Lactic Acid ◽  
Poly Ethylene Glycol ◽  
Butylene Succinate ◽  
Poly Ethylene

Mechanical, Thermal, and Morphological Properties of Thermoplastic Starch/Poly(lactic acid/Poly(butylene adipate-co-terephthalate) Blends

2014 ◽  
Vol 970 ◽  
pp. 312-316
Author(s):  
Sujaree Tachaphiboonsap ◽  
Kasama Jarukumjorn
Keyword(s):  
Lactic Acid ◽  
Impact Strength ◽  
Interfacial Adhesion ◽  
Tensile Modulus ◽  
Thermoplastic Starch ◽  
Morphological Properties ◽  
Poly Lactic Acid ◽  
Melt Blending ◽  
Elongation At Break ◽  
Blending Method

Thermoplastic starch (TPS)/poly (lactic acid) (PLA) blend and thermoplastic starch (TPS)/poly (lactic acid) (PLA)/poly (butylene adipate-co-terephthalate) (PBAT) blend were prepared by melt blending method. PLA grafted with maleic anhydride (PLA-g-MA) was used as a compatibilizer to improve the compatibility of the blends. As TPS was incorporated into PLA, elongation at break was increased while tensile strength, tensile modulus, and impact strength were decreased. Tensile properties and impact properties of TPS/PLA blend were improved with adding PLA-g-MA indicating the enhancement of interfacial adhesion between PLA and TPS. With increasing PBAT content, elongation at break and impact strength of TPS/PLA blends were improved. The addition of TPS decreased glass transition temperature (Tg), crystallization temperature (Tc), and melting temperature (Tm) of PLA. Tgand Tcof TPS/PLA blend were decreased by incorporating PLA-g-MA. However, the presence of PBAT reduced Tcof TPS/PLA blend. Thermal properties of TPS/PLA/PBAT blends did not change with increasing PBAT content. SEM micrographs revealed that the compatibilized TPS/PLA blends exhibited finer morphology when compared to the uncompatibilized TPS/PLA blend.

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