Stereocomplex crystallite network in poly(<scp>d</scp>,<scp>l</scp>-lactide): formation, structure and the effect on shape memory behaviors and enzymatic hydrolysis of poly(<scp>d</scp>,<scp>l</scp>-lactide)

Li, Yi; Xin, Shuangyang; Bian, Yijie; Dong, Qinglin; Han, Changyu; Xu, Kun; Dong, Lisong

doi:10.1039/c5ra01624j

Cited by 49 publications

(53 citation statements)

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“…f, the sc‐PLA particle obtained by this SCF technology has shown high melting point of about 228°C whereas PLLA and PDLA homopolymer have shown melting point of about 176°C. This melting behavior of sc‐PLA specimen was identical to normal sc on DSC thermogram . As shown in Fig.…”

Section: Resultssupporting

confidence: 72%

“…Our research group has also researched many studies for a fast and facile approach of SCF technology on various perspectives . Furthermore, these sc‐PLA particles can be used as filler to make composites with a biodegradable PLLA matrix of the same composition . Thus, controlling the size and behavior of sc‐PLA particles after stereocomplexation is very important to extend their possible applications.…”

Section: Introductionmentioning

confidence: 99%

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Supercritical fluid technology parameters affecting size and behavior of stereocomplex polylactide particles and their composites

Lee

Bibi

et al. 2017

Polymer Engineering & Sci

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Polylactide (PLA) is a eco‐friendly and biodegradable material that can be synthesized from renewable resources. PLA features poly(d‐lactic acid) (PDLA) and poly(l‐lactic acid) (PLLA) enantiomers. Supercritical fluid (SCF) technology is a very promising method for the stereocomplexation between PDLA and PLLA enantiomers. This study acquires stereocomplex (sc‐)PLA particles with diverse sizes and behaviors by controlling the experimental conditions. Various parameters including polymer concentration, reaction temperature, stirring speed, pressure reducing speed, and final temperature were controlled to adjust size and behavior of sc‐PLA particles. Additionally, we analyzed the effect of subsequent processing following SCF (such as homogenization, mechanical stirring, and sonication) on the size and morphological behavior of sc‐PLA particles. Finally, the mechanical strengths of different PLA composites featuring different sc‐PLA filler sizes were determined. The mechanical strength of PLA composites was significantly improved when using smaller filler sizes. POLYM. ENG. SCI., 58:1193–1200, 2018. © 2017 Society of Plastics Engineers

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Section: Resultssupporting

confidence: 72%

Section: Introductionmentioning

confidence: 99%

Supercritical fluid technology parameters affecting size and behavior of stereocomplex polylactide particles and their composites

Lee

Bibi

et al. 2017

Polymer Engineering & Sci

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“…The BT@CNTs/PVDF-HFP with 10 vol% BT@CNTs had a permittivity of 27.7 at 10 3 Hz, which was 1.65 times higher than the BT/PVDF-HFP with 10 vol% BT, while the dielectric loss was even lower than pure PVDF-HFP. [ 64,65 ] Ionic liquid was also used as a kind of functional fi ller to improve the dielectric properties of the composites. Kim et al prepared an excellent stretchable dielectric nano-composite that used polydimethylsiloxane (PDMS) as a polymer matrix and ionic liquid-based CNTs (IL+CNTs) as cofi llers.…”

Section: (Other Nanoparticles+cnts)/polymer Systemmentioning

confidence: 99%

1D/2D Carbon Nanomaterial‐Polymer Dielectric Composites with High Permittivity for Power Energy Storage Applications

Dang

Zheng

2016

Small

429

215

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With the development of flexible electronic devices and large-scale energy storage technologies, functional polymer-matrix nanocomposites with high permittivity (high-k) are attracting more attention due to their ease of processing, flexibility, and low cost. The percolation effect is often used to explain the high-k characteristic of polymer composites when the conducting functional fillers are dispersed into polymers, which gives the polymer composite excellent flexibility due to the very low loading of fillers. Carbon nanotubes (CNTs) and graphene nanosheets (GNs), as one-dimensional (1D) and two-dimensional (2D) carbon nanomaterials respectively, have great potential for realizing flexible high-k dielectric nanocomposites. They are becoming more attractive for many fields, owing to their unique and excellent advantages. The progress in dielectric fields by using 1D/2D carbon nanomaterials as functional fillers in polymer composites is introduced, and the methods and mechanisms for improving dielectric properties, breakdown strength and energy storage density of their dielectric nanocomposites are examined. Achieving a uniform dispersion state of carbon nanomaterials and preventing the development of conductive networks in their polymer composites are the two main issues that still need to be solved in dielectric fields for power energy storage. Recent findings, current problems, and future perspectives are summarized.

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“…The combination of SC and PEG ensures the absolute biodegradability and a vast opportunity to improve the properties of PLA. The stereocomplexation in racemic PLA systems with PEG, such as PLLA/PDLA/PEG, PDLA‐PEG‐PDLA/PLLA and PLLA‐PEG‐PLLA/PDLA‐PEG‐PDLA blends, has been investigated. The PEG chains acts as diluting agents to accelerate the formation of SCs and lead to a larger crystallization rate of PLAs in PLLA/PDLA/PEG and PDLA‐PEG‐PDLA/PLLA blends .…”

Section: Introductionmentioning

confidence: 99%

Relationship between the crystallization behavior of poly(ethylene glycol) and stereocomplex crystallization of poly(L‐lactic acid)/poly(D‐lactic acid)

Luo

Yang

Xiao

et al. 2018

Polymer International

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Poly(l‐lactic acid) (PLLA) is a good biomedical polymer material with wide applications. The addition of poly(ethylene glycol) (PEG) as a plasticizer and the formation of stereocomplex crystals (SCs) have been proved to be effective methods for improving the crystallization of PLLA, which will promote its heat resistance. In this work, the crystallization behavior of PEG and PLLA/poly(d‐lactic acid) (PDLA) in PLLA/PDLA/PEG and PEG‐b‐PLLA/PEG‐b‐PDLA blends has been investigated using differential scanning calorimetry, polarized optical microscopy and X‐ray diffraction. Both SCs and homocrystals (HCs) were observed in blends with asymmetric mass ratio of PLLA/PDLA, while exclusively SCs were observed in blends with approximately equal mass ratio of PLLA/PDLA. The crystallization of PEG was only observed for the symmetric blends of PLLA39k/PDLA35k/PEG2k, PLLA39k/PDLA35k/PEG5k, PLLA69k/PDLA96k/PEG5k and PEG‐b‐PLLA31k/PEG‐b‐PDLA27k, where the mass ratio of PLLA/PDLA was approximately 1/1. The results demonstrated that the formation of exclusively SCs would facilitate the crystallization of PEG, while the existence of both HCs and SCs could restrict the crystallization of PEG. The crystallization of PEG is related to the crystallinity of PLLA and PDLA, which will be promoted by the formation of SCs. © 2017 Society of Chemical Industry

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Stereocomplex crystallite network in poly(d,l-lactide): formation, structure and the effect on shape memory behaviors and enzymatic hydrolysis of poly(d,l-lactide)

Abstract: Rheological, mechanical properties and shape memory properties of PDLLA could be greatly improved through solution blending with sc-PLA.

Cited by 49 publications

References 50 publications

Supercritical fluid technology parameters affecting size and behavior of stereocomplex polylactide particles and their composites

Supercritical fluid technology parameters affecting size and behavior of stereocomplex polylactide particles and their composites

1D/2D Carbon Nanomaterial‐Polymer Dielectric Composites with High Permittivity for Power Energy Storage Applications

Relationship between the crystallization behavior of poly(ethylene glycol) and stereocomplex crystallization of poly(L‐lactic acid)/poly(D‐lactic acid)

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