Effect of molecular weight of polyethylene glycol on crystallization behaviors, thermal properties and tensile performance of polylactic acid stereocomplexes

Li, Ruilong; Wu, Yifan; Bai, Zhan; Guo, Jianbing; Chen, Xiaolang

doi:10.1039/d0ra08699a

Cited by 60 publications

(47 citation statements)

References 35 publications

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“…3a(iii)) showed the presence of some peaks at 18.5, 24, and 28.2 , which were ascribed to the stereocrystals observed in PEG of low molecular weight. 24,25 These bands cannot be attributed to changes in the crystal structure of InF 3 -1.4Yb-1.75Er because the surface modication was performed at 200 C and the crystallization process occurs up to 300 C (Fig. S1 †).…”

Section: Resultsmentioning

confidence: 99%

Highly efficient green up-conversion emission from fluoroindate glass nanoparticles functionalized with a biocompatible polymer

et al. 2022

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Section: Resultsmentioning

confidence: 99%

Highly efficient green up-conversion emission from fluoroindate glass nanoparticles functionalized with a biocompatible polymer

et al. 2022

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“…[ 56 ] Also, the PLLA IR spectrum exhibit characteristic bands attributable to CH stretch at 2998 and 2950 cm −1 , CO stretch at 1765 cm −1 , CO stretching vibration at 1100 cm −1 . [ 57–59 ]…”

Section: Resultsmentioning

confidence: 99%

“…[56] Also, the PLLA IR spectrum exhibit characteristic bands attributable to C-H stretch at 2998 and 2950 cm −1 , C=O stretch at 1765 cm −1 , C-O stretching vibration at 1100 cm −1 . [57][58][59] The IR spectrum of the PCL-b-PLLA diblock copolymer shown in Figure 4 exhibits a prominent band at 1758 cm −1 corresponding to C=O stretch for the PLLA segment and a shoulder band at 1728 cm −1 arising from the PCL block of the copolymer. The spectrum shows a clear shift in the absorption band values as compared to pristine PLLA and PCL which is in accordance with the reported literature.…”

Section: Ftir Of Pcl-b-plla Diblock Copolymermentioning

confidence: 99%

Synthesis, Optimal Fabrication, and Physico‐Mechanical Property Evaluation of PCL‐b‐PLLA Diblock Copolymer‐Based Nanoscale Roughness Textured Electrospun Mats

Sharma

Goel

Jacob

et al. 2021

Macro Materials & Eng

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Poly(ɛ-caprolactone)-block-poly(L-lactide) (PCL-b-PLLA) diblock copolymer and its electrospun mats (EMs) are characterized for their microstructural, thermal, and physico-mechanical properties. The EMs of synthesized copolymer exhibiting the optimal level of average fiber diameter (Co-FD) and diameter variation (Co-SD) are obtained following Taguchi's design of experiments (DOE). Electrospinning process parameters such as solution concentration, DMF content in CF/DMF solvent mixture, and applied voltage are varied at three different levels (L 9 ). Analysis of variance (ANOVA) indicated DMF content to be the major influencing factor on FD and SD of EMs with ∼95% confidence. Regression model indicated ∼88% accuracy in predicting the FD of the copolymer-based EMs. The physico-mechanical properties of the optimized EMs are evaluated vis-à-vis the influence of FD and SD on the mechanical properties. Atomic force microscopy revealed solvent evaporation induced radial inconsistencies, desirable in terms of nanoscale surface roughness, which is higher for Co-SD (∼600 nm) than in Co-FD (∼400 nm). The swelling and weight loss showed marked improvement in PCL-b-PLLA based EMs reiterating the possibility of their enhanced compatibility as biomedical materials.

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“…The peak strength of pure PLA nanofiber membrane was significantly higher than that of PLA nanofiber membrane with TP. [26][27][28] With the increase of TP addition, the main crystallization peak of the fiber membrane shifted, and the peak intensity and crystallinity showed a decreasing trend.…”

Section: Chemical Structure Of Pla/tp Nanofiber Membranesmentioning

confidence: 99%

Coaxial electrospinning preparation and antibacterial property of polylactic acid/tea polyphenol nanofiber membrane

Jie

Liu

Zhang

et al. 2022

Journal of Industrial Textiles

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The polylactic acid (PLA)/tea polyphenol (TP) nanofiber membranes were prepared by coaxial electrospinning. The physical properties, antibacterial agent release, degradation, and antibacterial properties were investigated. Results demonstrated that stepwise and controlled antibacterial agent release profiles were achieved based on the core-shell configuration and disparate degradation rate of PLA and TP. The mechanical performance decreased with the increase of the TP content in the shell layer. The cumulative antibacterial agent release rate of nanofiber membranes with different TP content was different, while the antibacterial agent release trend was the same. The antibacterial agent release rate of the sample was the fastest at the initial stage from 2 h to 8 h, and then gradually slowed down after 24 h. In addition, the antibacterial activity of the PLA/TP nanofiber membranes was confirmed by the inhibition zone method against both Gram-positive ( Staphylococcus aureus) and Gram-negative ( Escherichia coli). Results showed that the antibacterial performance of PLA/TP nanofiber was intensified with the increasing content of TP, especially had better antibacterial performance against S. aureus.

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Effect of molecular weight of polyethylene glycol on crystallization behaviors, thermal properties and tensile performance of polylactic acid stereocomplexes

Abstract: In this work, the poly(d-lactic acid)–polyethylene glycol–poly(d-lactic acid) (PDLA–PEG–PDLA) triblock copolymer as a novel modification agent was incorporated into poly(l-lactic acid) (PLLA) to improve the thermal and mechanical properties of PLLA.

Cited by 60 publications

References 35 publications

Highly efficient green up-conversion emission from fluoroindate glass nanoparticles functionalized with a biocompatible polymer

Highly efficient green up-conversion emission from fluoroindate glass nanoparticles functionalized with a biocompatible polymer

Synthesis, Optimal Fabrication, and Physico‐Mechanical Property Evaluation of PCL‐b‐PLLA Diblock Copolymer‐Based Nanoscale Roughness Textured Electrospun Mats

Coaxial electrospinning preparation and antibacterial property of polylactic acid/tea polyphenol nanofiber membrane

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