Stereocomplexation kinetics of enantiomeric poly(<scp>l</scp>-lactide)/poly(<scp>d</scp>-lactide) blends seeded by nanocrystalline cellulose

Jiang, Long; Lv, Pei; Ma, Piming; Bai, Huiyu; Dong, Weifu; Chen, Mingqing

doi:10.1039/c5ra12586c

Cited by 19 publications

(17 citation statements)

References 40 publications

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“…Bouapao and Tsuji reported that the nucleation constant ( K g ) values for stereocomplex crystallites for the blends are constant. Jiang et al . found that the transition temperature from regime II to regime III is 185 °C for symmetric PDLA/PLLA and both the nucleation constant and transition temperature strongly increased in the presence of nanocrystal cellulose.…”

Section: Resultsmentioning

confidence: 99%

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Crystallisation and spherulite morphology of polylactide stereocomplex

Shyr

et al. 2018

Polymer International

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In this study we investigated the crystallisation behaviours of stereocomplex crystals in poly(l‐lactic acid)/poly(d‐lactic acid) (PLLA/PDLA) blends (LD blends) of various weight ratios. The crystallisation and melting behaviours were studied using DSC, and the crystal structure was analysed through wide‐angle X‐ray diffraction. The morphology of homocrystals and stereocomplex crystals in the blends was examined using a hot‐stage polarising microscope and a scanning electron microscope. The DSC results showed that homocrystals and stereocomplex crystals were present in all LD blends except that with 50 wt% PLLA/50 wt% PDLA; in this blend, only stereocomplex crystals were present. The regime II → III transition temperature of stereocomplex crystals in a Lauritzen–Hoffman plot of the LD blends was determined to be 165 °C. A concentric spherulite consisting of stereocomplex crystals and homocrystals formed under two‐step isothermal crystallisation conditions with three growth stages was observed. The confined spherulitic growth rate in the concentric spherulite and the unrestricted spherulitic growth rate in individual spherulites were also analysed. © 2018 Society of Chemical Industry

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Section: Resultsmentioning

confidence: 99%

“…However, the nucleation constant ( K g ) values for stereocomplex crystallites of the blends are constant, indicating that a regime II → III transition of stereocomplex crystals was not observed. Jiang et al . studied the regime II → III transition of stereocomplex crystals of symmetric PDLA/PLLA affected by nanocrystal cellulose.…”

Section: Introductionmentioning

confidence: 99%

Crystallisation and spherulite morphology of polylactide stereocomplex

Shyr

et al. 2018

Polymer International

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“…SC-PLA was obtained with the assistance of making nanocomposites via melt blending in the presence of MWCNTs which acted as a nucleating agent to promote the formation of SC-PLA (94). Very recently, it was found that the stereocomplexation of PLA from the melt could also be significantly enhanced by using nanocrystal cellulose (NCC) as nuclei sites and the enhancement was more pronounced at high(er) NCC loading (25 wt%) (95). It can be concluded from above discussion that plasticizers could increase the segmental/ chain mobility while nucleating agents could promote the formation of SC, thus both of them are beneficial to the stereocomplexation.…”

Section: Stereocomplexation Via Physical Blending Routementioning

confidence: 98%

Crystallization modification of poly(lactide) by using nucleating agents and stereocomplexation

Jiang

Shen

et al. 2016

E-Polymers

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Poly(lactide), PLA, as one of the most promising biopolymers, has been receiving increasing attention in recent years because of its excellent performances in renewability, mechanical properties, biocompatibility and biodegradability. However, its application is limited by its brittleness and low heat distortion temperatures (HDT). The low HDT mainly results from a low crystallization rate and lack of crystallinity after fast processing, e.g. injection molding. Consequently, considerable attention was paid, in recent years, to achieve fast(er) crystallization of PLA. In here, we briefly review the research progress in the crystallization modification of PLA notably by means of adding nucleating agents and stereocomplexation.

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“…These characteristics of CNCs make it a feasible template for the preparation of crystalline material. Many crystalline materials including silver nanoparticles (AgNPs) [ 25 ], poly(L-lactide) (PLLA) [ 26 , 27 ], and metal organic frameworks (MOFs) [ 28 ] have been synthesized via using CNCs as template. As far as we know, the combination of CNCs and COFs has not yet been explored.…”

Section: Introductionmentioning

confidence: 99%

Cellulose Nanocrystals as Template for Improving the Crystallinity of Two-Dimensional Covalent Organic Framework Films

Liang

et al. 2021

Polymers

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Despite the rapid development of two-dimensional covalent organic frameworks (2D COFs) in recent years, it remains a great challenge to synthesize highly crystalline COF materials. Here, a CNC-assisted approach was adopted to synthesize high crystallinity COF materials. A series of 2D COF films were synthesized at the air–water interface by using cellulose nanocrystals (CNCs) as the template. The occurrence of Schiff reactions based on the imine bond was demonstrated by Raman spectroscopy and Fourier transform infrared spectroscopy (FTIR). Scanning electron microscopy (SEM) exhibited the appearances of 2D COF films were flower-like. When CNCs were added to a certain extent, the size of a single petal in the flowers gradually increased with the amount of CNCs. The film with large petals was characterized by Ultraviolet–Visible diffuse reflectance spectroscopy (UV–Vis DRS), X-ray photoelectron spectroscopy (XPS), transmission electron microscopy (TEM), and selected area electron diffraction (SAED). In UV–Vis DRS curves, the S-band of COF-366 film was red-shifted by 24 nm compared with that of 5,10,15,20-tetrakis(4-aminophenyl)-21H,23H-porphyrin (TAPP), confirming the existence of extended conjugation in COF-366 film. XPS was used to identify the surface composition of the sample. The N1s signal of the film indicated that each TAPP formed four imine bonds with 2,5-dihydroxyterephthalaldehyde (DHTA) in COF-366 film. TEM images showed that CNCs had an influence on the crystal size. It was observed from SAED that the crystallinity of the film with CNCs was higher than the film without CNCs. This work provided a new template for improving the crystallinity of 2D COF films.

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Stereocomplexation kinetics of enantiomeric poly(l-lactide)/poly(d-lactide) blends seeded by nanocrystalline cellulose

Cited by 19 publications

References 40 publications

Crystallisation and spherulite morphology of polylactide stereocomplex

Crystallisation and spherulite morphology of polylactide stereocomplex

Crystallization modification of poly(lactide) by using nucleating agents and stereocomplexation

Cellulose Nanocrystals as Template for Improving the Crystallinity of Two-Dimensional Covalent Organic Framework Films

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