Isolation, characterization, and microwave assisted surface modification of Colocasia esculenta (L.) Schott mucilage by grafting polylactide

Mijinyawa, Abubakar Hamisu; Durga, Geeta; Mishra, Anuradha

doi:10.1016/j.ijbiomac.2018.08.045

Cited by 28 publications

(17 citation statements)

References 32 publications

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“…The thermal stage over the temperature range represented the decomposition of the PLA portion of the CEMg-PLA copolymer [22] and has confirmed the formation of the copolymer. It was inferred that the CEM portions of the copolymer were stable at 290.1-300.28 °C at various heating rates.…”

Section: Thermal Degradation Behavior Of Cem and Cem-g-pla Copolymermentioning

confidence: 66%

“…Their corresponding activation energies over the conversion range (α = 0.1-0.7) were computed to be 18. lower activation energies at all conversions as compared to those of CEM. This could be attributed to the presence of weakly bonded ester linkages (-C-O-C=O bond) in CEM-g-PLA copolymer [22]. In CEM-g-PLA copolymer, the dependence of the activation energy (E α ) over α has been attributed to two main degradation regions for the three models ( Fig.…”

Section: Thermal Isoconversional Degradation Analysis Of Cem and Cem-mentioning

confidence: 92%

“…The CEM-g-PLA copolymer (Grafting%, and Grafting Effi-ciency% = 133.0 and 33.3, respectively) was synthesized under commercial microwave oven via ROP of lactide (LA) onto taro mucilage (CEM) backbone chain catalyzed by stannous octoate using chloroform as solvent. The full details of the isolation of the CEM and synthesis of CEMg-PLA have been published earlier by our group [22]. The graft chain length of the copolymer was 100 as determined by analysis of its 1 H NMR spectrum ( Fig.…”

Section: Methodsmentioning

confidence: 99%

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Evaluation of thermal degradation and melt crystallization behavior of taro mucilage and its graft copolymer with poly(lactide)

2019

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This communication presents the thermal degradation behavior and non-isothermal crystallization kinetics of taro mucilage (CEM) and its graft copolymer polylactide (CEM-g-PLA) by thermogravimetric analysis (TGA/DTG coupled techniques) and differential scanning calorimetric. Isoconversional degradation analysis for CEM and CEM-g-PLA performed with the aid of Friedman, Kissinger (KSS), Flynn-Wall-Ozawa (FWO), and Kissinger-Akahira-Sunose (KAS) methods. The energy profiles and Criado plots over specific conversion (α) were able to predict that both CEM-g-PLA and CEM followed multi step kinetics and different degradation mechanisms. The Ozawa model fitted the melt crystallization data for CEM-g-PLA and its exponent (m) complements those for the modified Avrami and Tobin models. The crystallization of CEM-g-PLA was characterized with the formation of two distinct crystal growths. Further, the negative isoconversional activation energy suggested the occurrence of melt crystallization in CEM-g-PLA. Thus, the grafting of PLA onto CEM resulted into a material that shows thermal properties entirely different from that of its precursor (CEM) besides having an increased shelf life and not compromising with biodegradability. The analyzed data from the isoconversional equations (viz. Friedman, FWO and KAS models) and Ozawa model could be useful in modelling the degradation stability/mechanism and crystallization behavior of polylactide-grafted copolymer.

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Section: Thermal Degradation Behavior Of Cem and Cem-g-pla Copolymermentioning

confidence: 66%

Section: Thermal Isoconversional Degradation Analysis Of Cem and Cem-mentioning

confidence: 92%

Section: Methodsmentioning

confidence: 99%

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Evaluation of thermal degradation and melt crystallization behavior of taro mucilage and its graft copolymer with poly(lactide)

2019

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“…The graft copolymer and homopolymer were separated as per the method described by Witonoa et al . Percent grafting (PG) and grafting efficiency (GE) were calculated by the method mentioned elsewhere . The reaction variables were taken as concentrations of acrylic acid and ceric ion, temperature and time; and a total number of 23 copolymer samples were prepared.…”

Section: Methodsmentioning

confidence: 99%

Quantification of Optimal Reaction Parameters for the Synthesis of a Polysaccharide‐Based Graft Copolymers Using Combined Shannon's Entropy and Data Envelopment Analysis

2019

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The traditional process of synthesis of desired materials involves a trial and error approach, which consumes considerable time and resources. Therefore, it is necessary to implement computer-aided optimizing techniques for the precise synthesis of desired material. This paper presents a novel modeling approach for precise synthesis of graft copolymers of poly(acrylic acid) and Tamarind seed polysaccharide (xyloglucan). Different sets of variables generated through experimental study have been analyzed for the quantification of optimal reaction variables and parameters using combined Shannon's entropy and data envelopment analysis (DEA). Experimental data from the grafting reaction such as concentration of acrylic acid, temperature, and time are used to validate the model and a good agreement between model predictions and experimental data is observed. The proposed innovative green approach for designing the precise synthesis of xyloglucan based graft copolymers may help in identifying the optimal conditions for polymerization reaction to reach targeted materials more efficiently.

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“…Purification of the copolymer was carried out by polylactide extraction with a non solvent. Several authors have reported the use of organic solvents, such as chloroform [15], toluene [7,52,53], acetone [54] and hexane [49,55], to remove the polylactide, or a solvent mixture like toluene/methanol [56]. In this study, hexane was chosen to remove the homopolymer.…”

Section: Cashew Gum Graft Reaction Yieldmentioning

confidence: 99%

Self-assembling cashew gum-graft-polylactide copolymer nanoparticles as a potential amphotericin B delivery matrix

Richter¹,

Carneiro²,

Sousa³

et al. 2020

International Journal of Biological Macromolecules

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Isolation, characterization, and microwave assisted surface modification of Colocasia esculenta (L.) Schott mucilage by grafting polylactide

Cited by 28 publications

References 32 publications

Evaluation of thermal degradation and melt crystallization behavior of taro mucilage and its graft copolymer with poly(lactide)

Evaluation of thermal degradation and melt crystallization behavior of taro mucilage and its graft copolymer with poly(lactide)

Quantification of Optimal Reaction Parameters for the Synthesis of a Polysaccharide‐Based Graft Copolymers Using Combined Shannon's Entropy and Data Envelopment Analysis

Self-assembling cashew gum-graft-polylactide copolymer nanoparticles as a potential amphotericin B delivery matrix

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