Processing of Nanodiamond Loaded Poly(Lactic Acid) Co-Continuous Porous Structures

2010 ◽  
Author(s):  
Wei Zhang ◽  
Tom Wyatt ◽  
Donggang Yao ◽  
Qingwei Zhang ◽  
Jack G. Zhou
Keyword(s):  
Lactic Acid ◽  
Porous Matrix ◽  
Poly Lactic Acid ◽  
Ternary Blend ◽  
Porous Structures ◽  
Mixing Conditions ◽  
Mixing Ratios ◽  
Annealing Conditions ◽  
Post Annealing ◽  
Phase Size

Porous poly(lactic acid) PLA materials are highly demanded as scaffolding templates in tissue engineering applications. In this study, a protocol for creating co-continuous porous PLA structures with nanodiamond (ND) as additive was investigated. First, a ternary blend of PLA/PS/ND was prepared with different mixing ratios under different mixing conditions. Next, a post annealing stage was applied to coarsen the phase structure. Finally, the PS phase was sacrificially extracted, leaving a porous matrix. The experimental results showed that ND can be an effective compatiblizer for increasing the miscibility between PS and PLA and reducing the phase size. It was further found that the post annealing conditions significantly affect the distribution of ND particles in the blend and finally in the porous PLA structure.

Effect of Annealing on Fracture Mechanism of Biodegradable Poly(lactic acid)

2004 ◽  
Vol 261-263 ◽  
pp. 105-110 ◽  
Author(s):  
Sang Dae Park ◽  
Mitsugu Todo ◽  
Kazuo Arakawa
Keyword(s):  
Fracture Toughness ◽  
Lactic Acid ◽  
Crack Growth ◽  
Fracture Mechanism ◽  
Poly Lactic Acid ◽  
Crack Growth Behavior ◽  
Annealing Conditions ◽  
Macroscopic Fracture ◽  
Biodegradable Poly ◽  
Static Fracture

Effect of annealing on the fracture behavior of poly(lactic acid) (PLA) was investigated. Fracture toughness of PLA samples prepared under different annealing conditions was measured under static and dynamic loadings. Microstructure and crack growth behavior were characterized by polarizing microscopy (POM). Crystallinity was determined by DSC analysis. Fracture surface morphology was also studied by scanning electron microscopy. It was shown that the static fracture toughness increased with increase of crystallinity, while the dynamic toughness increased as crystallinity increased. POM exhibited that craze formation played an important role in the fracture mechanism of amorphous samples. Macroscopic fracture toughness and microscopic crack growth mechanism were correlated on the basis of these experimental results, and effect of annealing on the toughness and mechanism were discussed.

Role of Temperature Change on Poly(DL-lactic acid) Porous Matrix Film Fabrication by Solvent Casting Method

2014 ◽  
Vol 1060 ◽  
pp. 184-187 ◽  
Author(s):  
Sasiprapa Chitrattha ◽  
Thawatchai Phaechamud
Keyword(s):  
Lactic Acid ◽  
Porous Structure ◽  
Temperature Change ◽  
Room Temperature ◽  
Porous Matrix ◽  
Effect Of Temperature ◽  
Poly Lactic Acid ◽  
Solvent Casting ◽  
Porous Films ◽  
Casting Method

Poly(lactic acid) (PLA) has a variety of applications. It has been widely used in the biomedical and pharmaceutical fields due to its biocompatibility and biodegradability. Polyethylene glycol (PEG) is used as an inactive ingredient in the pharmaceutical industry as a solvent, plasticizer, surfactant, ointment base, suppository base, tablet lubricant and capsule lubricant. The aim of this study was to determine the effect of temperature change on PLA porous matrix film fabricating by solvent casting method with an addition of PEG400 to improve and increase the pore interconnectivity. Their mechanical properties such as tensile strength (TS) and % elongation at break (%E) and morphology were investigated. Porous films were prepared at 4 °C for 24 h and dry at room temperature for 24 h (4CRT), 4 °C for 24 h and dry at 60 °C for 24 h (4C60C), -20 °C for 24 h and dry at room temperature for 24 h (-20CRT), -20 °C for 24 h and dry at 60 °C for 24 h (-20C60C), -80 °C for 24 h and dry at room temperature for 24 h (-80CRT), and -80 °C for 24 h and dry at 60 °C for 24 h (-80C60C). 4C60C exhibited the highest strength and toughest, however all of samples showed the quite soft behavior. From topography study they displayed the different porous structure which sample of 4C60C displayed the smallest porous structure. Therefore, the temperature change between the fabrication processes affected the TS, %E and morphology structure of PLA porous matrix films.

scholarly journals Super-Toughened Poly(lactic Acid) with Poly(ε-caprolactone) and Ethylene-Methyl Acrylate-Glycidyl Methacrylate by Reactive Melt Blending

Polymers ◽  
2019 ◽  
Vol 11 (5) ◽  
pp. 771 ◽  
Author(s):  
Ao-Lin Hou ◽  
Jin-Ping Qu
Keyword(s):  
Lactic Acid ◽  
Methyl Acrylate ◽  
Glycidyl Methacrylate ◽  
Phase Morphology ◽  
Poly Lactic Acid ◽  
Ternary Blend ◽  
Differential Scanning Calorimetric ◽  
Melt Blending ◽  
Reactive Melt ◽  
Ethylene Methyl Acrylate

In recent years, poly(lactic acid) (PLA) has attracted more and more attention as one of the most promising biobased and biodegradable polymers. However, the inherent brittleness significantly limits its wide application. Here, ternary blends of PLA, poly(ε-caprolactone) (PCL) with various amounts of ethylene-methyl acrylate-glycidyl methacrylate (EMA-GMA) terpolymer were fabricated through reactive melt blending in order to improve the toughness of PLA. The effect of different addition amounts of EMA-GMA on the mechanical properties, interfacial compatibility and phase morphology of PLA/PCL blends were studied. The reactions between the epoxy groups of EMA-GMA and carboxyl and hydroxyl end groups of PLA and PCL were investigated thorough a Fourier transform infrared (FT-IR). The miscibility and thermal behavior of the blends were studied through a dynamic mechanical analysis (DMA), differential scanning calorimetric (DSC) and X-ray diffraction (XRD). The phase morphology and impact fracture surface of the blends were also investigated through a scanning electron microscope (SEM). With the addition of 8 phr EMA-GMA, a PLA/PCL (90 wt %:10 wt %)/EMA-GMA ternary blend presenting a suitable multiple stacked phase structure with an optimum interfacial adhesion exhibited an elongation at break of 500.94% and a notched impact strength of 64.31 kJ/m2 with a partial break impact behavior. Finally, the toughening mechanism of the supertough PLA based polymers have been established based on the above analysis.

Super toughened renewable poly(lactic acid) based ternary blends system: effect of degree of hydrolysis of ethylene vinyl acetate on impact and thermal properties

RSC Advances ◽  
2016 ◽  
Vol 6 (76) ◽  
pp. 72681-72691 ◽  
Author(s):  
V. H. Sangeetha ◽  
Ravi babu Valapa ◽  
S. K. Nayak ◽  
T. O. Varghese
Keyword(s):  
Lactic Acid ◽  
Thermal Properties ◽  
Vinyl Acetate ◽  
Ethylene Vinyl Acetate ◽  
Poly Lactic Acid ◽  
Ternary Blend ◽  
Degree Of Hydrolysis ◽  
Ternary Blends ◽  
System Effect ◽  
Hydrolysis Of

Effect of hydrolysed EVA on PLA ternary blend systems.

scholarly journals Effect of blending procedures and reactive compatibilizers on the properties of biodegradable poly(butylene adipate-co-terephthalate)/poly(lactic acid) blends

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Dandan Wu ◽  
Anping Huang ◽  
Jie Fan ◽  
Renwei Xu ◽  
Peng Liu ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Tensile Properties ◽  
Phase Interface ◽  
Polymer Materials ◽  
Poly Lactic Acid ◽  
Practical Application ◽  
Biodegradable Poly ◽  
Phase Size ◽  
One Step ◽  
The One

AbstractThe effect of Joncryl ADR®-4368 (abbreviated ADR) and dicumyl peroxide (DCP) on poly(butylene adipate-co-terephthalate) (PBAT)/poly(lactic acid) (PLA) blend was investigated. Two different blending procedures were adopted: (1) one-step blending of all components for 8 min; (2) premixing of PBAT and ADR (or DCP) for 4 min followed by addition of PLA blending for 4 min. ADR and DCP were effective compatibilizers for the PBAT/PLA blend by one-step blending which were confirmed by improving the phase interface between PBAT and PLA, decreasing the dispersed phase size, increasing the elasticity, viscosity and tensile strength. Moreover, the addition of ADR into PBAT/PLA blend by two-step blending was more efficient than the one-step blending based on refined morphology and further increased tensile properties. The two-step blending was beneficial to produce a larger amount of PBAT-graft-PLA (PBAT-g-PLA) copolymers at the phase interface. However, DCP was added to the PBAT/PLA blend by the two-step blending which showed lower properties than one-step blending. DCP triggered free branching reactions in a fast way. Based on the character of compatibilizers, choosing properly blending procedures can enlarge the tensile properties. These results would be interesting for industrial polymer materials, and may be importance to the wider practical application of PBAT/PLA blends.

Properties of a Biodegradable Ternary Blend of Thermoplastic Starch (TPS), Poly(ε-Caprolactone) (PCL) and Poly(Lactic Acid) (PLA)

2014 ◽  
Vol 23 (1) ◽  
pp. 83-89 ◽  
Author(s):  
Vitor Brait Carmona ◽  
Ana Carolina Corrêa ◽  
José Manoel Marconcini ◽  
Luis Henrique Capparelli Mattoso
Keyword(s):  
Lactic Acid ◽  
Thermoplastic Starch ◽  
Poly Lactic Acid ◽  
Ternary Blend
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