Synthesis and characterization of polylactide/rice husk hydrochar composite

Nizamuddin, Sabzoi; Jadhav, Ankit; Qureshi, Sania; Baloch, Humair Ahmed; Siddiqui, M.T.H.; Mubarak, Nabisab Mujawar; Griffin, Gregory; Madapusi, Srinivasan; Tanksale, Akshat; Ahamed, Mohd Imran

doi:10.1038/s41598-019-41960-1

Cited by 82 publications

(31 citation statements)

References 67 publications

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“…The annealing time showed no significant effect on the melting temperature as reported elsewhere [ 27 ]. The peak melting temperature slightly increased as a function of annealing time interval from 168.4 for 0-PLA to 169.7 °C for 24-PLA.…”

Section: Resultssupporting

confidence: 77%

Thermal Insulation and Mechanical Properties of Polylactic Acid (PLA) at Different Processing Conditions

et al. 2020

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This work aims to provide an extensive evaluation on the use of polylactic acid (PLA) as a green, biodegradable thermal insulation material. The PLA was processed by melt extrusion followed by compression molding and then subjected to different annealing conditions. Afterwards, the thermal insulation properties and structural capacity of the PLA were characterized. Increasing the annealing time of PLA in the range of 0–24 h led to a considerable increase in the degree of crystallization, which had a direct impact on the thermal conductivity, density, and glass transition temperature. The thermal conductivity of PLA increased from 0.0643 W/(m·K) for quickly-cooled samples to 0.0904 W/(m·K) for the samples annealed for 24 h, while the glass transition temperature increased by approximately 11.33% to reach 59.0 °C. Moreover, the annealing process substantially improved the compressive strength and rigidity of the PLA and reduced its ductility. The results revealed that annealing PLA for 1–3 h at 90 °C produces an optimum thermal insulation material. The low thermal conductivity (0.0798–0.0865 W/(m·K)), low density (~1233 kg/m3), very low water retention (<0.19%) and high compressive strength (97.2–98.7 MPa) in this annealing time range are very promising to introduce PLA as a green insulation material.

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Section: Resultssupporting

confidence: 77%

Thermal Insulation and Mechanical Properties of Polylactic Acid (PLA) at Different Processing Conditions

et al. 2020

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“…Figure 4 is the 13 C NMR of PDLA-PEG-PDLA triblock copolymer. Among the isotopes of C, only 13 C has spin phenomenon, and nuclear magnetic resonance absorption. The principle is the same as that of the hydrogen spectrum, but the chemical displacement range of the carbon spectrum is very wide, generally 0~250 ppm 30 .…”

Section: Resultsmentioning

confidence: 99%

“…13 C NMR spectra of PDLA-PEG-PDLA triblock copolymers with different PEG segments: (A) PEG with different molecular weights is 2000, 4000, 6000, and 8000 and (B) The ratio of D -LA/PEG is 1/1, 2/1, and 3/1, respectively. (2020) 10:3627 | https://doi.org/10.1038/s41598-020-60458-9…”

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confidence: 99%

Synthesis, characterization, and crystallization behaviors of poly(D-lactic acid)-based triblock copolymer

Chen

et al. 2020

Sci Rep

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poly(D-lactic acid) (PDLA) with different polyethylene glycol (PEG) segment synthesized PDLA-PEG-PDLA triblock copolymer through the ring-opening reaction of D-LA and PEG will be used as a toughening modifier. The microstructure, crystal structures and crystallization behaviors of this triblock copolymer were investigated by fourier transform infrared (ftiR) spectroscopy, nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction (XRD), differential scanning calorimetry (DSC) and polarized optical microscopy (POM). The triblock copolymer is synthesized from the appearance of cH 2 stretching vibration peak at 2910 cm −1 and CO stretching vibration peak at 1200 cm −1 from PEG in FTIR spectra. Moreover, the chemical shift that is about 3.6 ppm in 1 H NMR and 68.8ppm in 13 c nMR proves this matter. The results of XRD and DSC reveal that PDLA and PEG are crystallized separately, and are not fully compatible, and microphase separation has occurred in this triblock copolymer. PEG can induce the triblock copolymer to accelerate the rate of crystallization, allowing it to crystallize more completely in the same amount of time. When the molecular weight of PEG is 6000 or the ratio of D-LA/ PEG is 1/1, the crystallizability of PDLA-PEG-PDLA triblock copolymer is the best. The rapid development of industry has brought great convenience to people's lives, but the environmental pollution caused by the rapid development is also gradually exposed, coupled with the oil crisis caused by the extensive development and utilization of petroleum resources, the necessity and urgency of the research and development of degradable polymers are gradually highlighted. Among the various degradable polymers, polylactic acid (PLA) is the most promising as a green polymer material 1-3. The biggest and most prominent advantage of PLA is that it can be recycled in nature 4. Its raw materials are renewable biological resources, so it is no longer dependent on petroleum and other resources. Its wastes are completely transformed into carbon dioxide and water through hydrolysis and a series of biological metabolism, which is harmless to human body and non-toxic, and has no pollution to the environment 5,6. According to the chiral property of the structural unit, PLA can be divided into poly (L-lactic acid) (PLLA), poly (D-lactic acid) (PDLA) and poly (D , L-lactic acid) (PDLLA) 7. However, compared with polyesters with higher rigidity, PLA is a semi-crystalline polymer, which usually has a slower crystallization rate without external force and produces some amorphous products during processing 8,9. And its heat resistance is poor, which limits its application requirements in bioengineering, food packaging and other industries 10-12. Currently, in order to improve its physical or thermodynamic properties, PLA is modified by adding other substances to form composites (such as rice husk hydrochar 13 , lignin 14 , polycarbonate 15 , chitosan 16 , etc.) and polymerizing with other substances (such as PLA-PCVL-PLA 17 , SEBS-g-PLA 18 , etc.). Of course...

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“…Thermal degradation behavior is taken into consideration as a significant and simple tool to determine thermal stability of polymer-composites during thermal processing [43]. TGA analysis curves of PVA/starch and PVA/starch/biochar composites are represented in Figure 4.…”

Section: Resultsmentioning

confidence: 99%

Biochar Reinforced Polyvinyl Alcohol /Corn Starch Biocomposites

Terzioğlu

Parın

2020

Süleyman Demirel Üniversitesi Fen Bilimleri Enstitüsü Dergisi

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The utilization of biochar in polymer composites can be considered as a sustainable approach that provide valorization of a waste to a value-added material and at the same time diminish biowaste in a smart way. This study is focused on the evaluation of biochar as a filler in polyvinyl alcohol /corn starch composites. The composites were prepared via solution mixing and casting method using citric acid as a plasticizer and glutaraldehyde as a cross-linker. Distribution of biochar in the PVA/starch matrix was evaluated by optical microscopy. The structural features of composites were characterized using FTIR spectroscopy. Effects of biochar loading ratio (0-12 wt%) on the thermal stability of the PVA/starch blends were determined by differential scanning calorimetry and thermogravimetric analyses. The decomposition temperatures of the PVA/starch/biochar composites decreased in comparison to PVA/starch composites.

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Synthesis and characterization of polylactide/rice husk hydrochar composite

Cited by 82 publications

References 67 publications

Thermal Insulation and Mechanical Properties of Polylactic Acid (PLA) at Different Processing Conditions

Thermal Insulation and Mechanical Properties of Polylactic Acid (PLA) at Different Processing Conditions

Synthesis, characterization, and crystallization behaviors of poly(D-lactic acid)-based triblock copolymer

Biochar Reinforced Polyvinyl Alcohol /Corn Starch Biocomposites

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