High Molecular Weight Poly(lactic acid) Synthesized with Apposite Catalytic Combination and Longer time

Singh, Sanjay Kumar; Anthony, Prashant; Chowdhury, Abhishek

doi:10.13005/ojc/3404036

Cited by 27 publications

(8 citation statements)

References 39 publications

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“…The feature positioned at 872 cm –1 corresponds to C–COO stretching vibrations . Also, it was stated that bands positioned at 872 and 757 cm –1 show the amorphous and crystalline phases of PLA, respectively . Band located at 1044 cm –1 is related to CH 3 group .…”

Section: Resultsmentioning

confidence: 97%

Effect of Silane A-174 Modifications in the Structure, Chemistry, and Compressive Strength of PLA-HAP and PLA-β-TCP Biocomposites: Toward the Design of Polymer–Ceramic Implants with High Performance

Oner

Alakent

Soyer-Uzun

2021

ACS Appl. Polym. Mater.

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The effect of silane A-174 (3-(trimethoxysilyl)propyl methacrylate (methacryloxypropyl trimethoxysilane)) modifications of the ceramic surface on the structural characteristics and mechanical performance of hydroxyapatite (HAP)−polylactic acid (PLA) and β-tricalcium phosphate (β-TCP)−PLA composite systems was investigated employing a combination of Fourier transform infrared (FTIR) spectroscopy, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), compressive strength measurements, and statistical models constructed via projection to latent structures (PLS) analysis. The composites were synthesized by solvent casting method at ambient conditions employing ceramic/PLA ratios of 60/40 and 50/ 50, and silane A-174 percentages of 0, 1, and 3 wt %. Peak positions of O 1s, Ca 2p, P 2p, Si 2p, and C 1s in XP spectra of ceramics, surface-modified ceramics, and the corresponding composites and compressive strength values were used as the predictors and response variables in PLS models. It was found that Ca 2p, P 2p, and Si 2p binding energies of the ceramic component employed in composite synthesis played the most significant role in determining compressive strength. PLA-HAP composite with a ceramic/PLA ratio of 50/50, synthesized employing 3 wt % silane A-174 treated HAP (HAP50PLA50Si3), resulted in enhancement of the compressive strength up to 365 MPa, which is the highest compressive strength value reported in the literature to the best of our knowledge. Additional P 2p, Ca 2p, and C 1s features positioned at 129.64, 350.08, and 280.74 eV in the XP spectra of this specimen together with significant shifts of Si 2p and C 1s bands toward lower binding energies and polymer-bridge-like surface characteristics signaled improved polymer−ceramic interaction in this composite. Attaining mechanical performance comparable with and even higher than that of cortical bone upon silane A-174 modifications might provide opportunities for clinical applications toward developing bioresorbable PLA-HAP-based implants that can be employed in load-bearing applications such as knee and hip replacements.

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Section: Resultsmentioning

confidence: 97%

Effect of Silane A-174 Modifications in the Structure, Chemistry, and Compressive Strength of PLA-HAP and PLA-β-TCP Biocomposites: Toward the Design of Polymer–Ceramic Implants with High Performance

Oner

Alakent

Soyer-Uzun

2021

ACS Appl. Polym. Mater.

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“…The band at 3437 cm −1 (only present in PHA) is associated with O–H bond stretching [ 27 , 28 ]. Bands between 2994 cm −1 and 2852 cm −1 correspond to symmetric and asymmetric stretching of C–H in CH 3 [ 27 , 28 , 29 , 30 , 31 ]; bands at 1721–1745 cm −1 relate to carbonyl group stretching [ 27 , 28 , 29 , 30 , 31 , 32 , 33 ]; bands between 1454 cm −1 and 1358 cm −1 are characteristic of symmetric and asymmetric deformations of the CH 3 bond [ 27 , 28 , 29 , 30 , 33 ]; bands between 1269 cm −1 and 1079 cm −1 relate to deformations of the ether group, C-O-C [ 27 , 28 , 29 , 31 , 33 ]; bands from 955 cm −1 to 1041 cm −1 correspond to rocking of the C–CH 3 bond [ 27 , 28 , 29 , 33 ]; bands at 895–865 cm −1 refer to stretching of the O-CH-CH 3 group [ 27 , 28 , 29 , 30 , 33 ], and bands at 752–751 cm −1 correspond to wagging of CH 3 (present in PLA and PLA–PHA) [ 27 , 30 ]. A more detailed summary of the band locations for each polymeric filament and its bonding/vibration type can be found in Table S1 of the Supplementary Information .…”

Section: Resultsmentioning

confidence: 99%

Mechanical, Thermal, and Physicochemical Properties of Filaments of Poly (Lactic Acid), Polyhydroxyalkanoates and Their Blend for Additive Manufacturing

Mondragón-Herrera,

Vargas-Coronado,

Carrillo-Escalante

et al. 2024

Polymers

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Polymeric blends are employed in the production of filaments for additive manufacturing to balance mechanical and processability properties. The mechanical and thermal properties of polymeric filaments made of poly (lactic acid) (PLA), polyhydroxyalkanoates (PHA), and its blend (PLA–PHA) are investigated herein and correlated to their measured structural and physicochemical properties. PLA exhibits the highest stiffness and tensile strength, but lower toughness. The mechanical properties of the PLA–PHA blend were similar to those of PLA, but with a significantly higher toughness. Despite the lower mechanical properties of neat PHA, incorporating a small amount (12 wt.%) of PHA into PLA significantly enhances toughness (approximately 50%) compared to pure PLA. The synergistic effect is attributed to the spherulitic morphology of blended PHA in PLA, promoting interactions between the amorphous regions of both polymers. Thermal stability is notably improved in the PLA–PHA blend, as determined by thermogravimetric analysis. The blend also exhibits lower cold crystallization and glass transition temperatures as compared to PLA, which is beneficial for additive manufacturing. Following additive manufacturing, X-ray photoelectron spectroscopic showed that the three filaments present an increase in C–C and C=O bonds associated with the loss of C–O bonds. The thermal process induces a slight increase in crystallinity in PHA due to chain reorganization. The study provides insights into the thermal and structural changes occurring during the melting process of additive manufacturing.

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“…A band at 756 cm −1 is attributed to the bending of the C=O bond [ 45 , 46 , 47 ]. In the pure PLA sample, an absorption band at 3506 cm −1 is indicative of the characteristic terminal –OH bond found in low-molecular-weight polymers [ 48 ].…”

Section: Resultsmentioning

confidence: 99%

Sonochemical Synthesis of Magnetite/Poly(lactic acid) Nanocomposites

de França,

Lima,

Barbosa

et al. 2023

Polymers

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Nanocomposites based on poly(lactic acid) (PLA) and magnetite nanoparticles (MNP-Fe3O4) show promise for applications in biomedical treatments. One key challenge is to improve the stabilization and dispersion of MNP-Fe3O4. To address this, we synthesized MNP-Fe3O4/PLA nanocomposites using ultrasound mediation and a single iron(II) precursor, eliminating the need for surfactants or organic solvents, and conducted the process under ambient conditions. The resulting materials, containing 18 and 33 wt.% Fe3O4, exhibited unique thermal behavior characterized by two mass losses: one at a lower degradation temperature (Td) and another at a higher Td compared to pure PLA. This suggests that the interaction between PLA and MNP-Fe3O4 occurs through hydrogen bonds, enhancing the thermal stability of a portion of the polymer. Fourier Transform Infrared (FT-IR) analysis supported this finding, revealing shifts in bands related to the terminal –OH groups of the polymer and the Fe–O bonds, thereby confirming the interaction between the groups. Raman spectroscopy demonstrated that the PLA serves as a protective layer against the oxidation of MNP-Fe3O4 in the 18% MNP-Fe3O4/PLA nanocomposite when exposed to a high-power laser (90 mW). Transmission Electron Microscopy (TEM) and Scanning Electron Microscopy (SEM) analyses confirmed that the synthetic procedure yields materials with dispersed nanoparticles within the PLA matrix without the need for additional reactants.

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High Molecular Weight Poly(lactic acid) Synthesized with Apposite Catalytic Combination and Longer time

Cited by 27 publications

References 39 publications

Effect of Silane A-174 Modifications in the Structure, Chemistry, and Compressive Strength of PLA-HAP and PLA-β-TCP Biocomposites: Toward the Design of Polymer–Ceramic Implants with High Performance

Effect of Silane A-174 Modifications in the Structure, Chemistry, and Compressive Strength of PLA-HAP and PLA-β-TCP Biocomposites: Toward the Design of Polymer–Ceramic Implants with High Performance

Mechanical, Thermal, and Physicochemical Properties of Filaments of Poly (Lactic Acid), Polyhydroxyalkanoates and Their Blend for Additive Manufacturing

Sonochemical Synthesis of Magnetite/Poly(lactic acid) Nanocomposites

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