Biodegradable silica rubber core-shell nanoparticles and their stereocomplex for efficient PLA toughening

Liu, Yupeng; Muiruri, Joseph Kinyanjui; Thitsartarn, Warintorn; Zhang, Xing; Tan, B. T. G.; He, Chaobin

doi:10.1016/j.compscitech.2018.02.026

Cited by 84 publications

(67 citation statements)

References 42 publications

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“…In contrast, SEM images of the nanocomposites with pristine GE showed a rough morphology, indicating ductile deformation prior to fracturing (Figure (b) and (c)). SEM images of the nanocomposites with KH‐GE showed many tortuous cracks and ridges, also indicating ductile deformation prior to fracturing (Figure (d) and (e)), which accounts for the high impact strength of the DGEBA/GE nanocomposites.…”

Section: Resultsmentioning

confidence: 96%

Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

Jin

Guo

et al. 2019

Bulletin Korean Chem Soc

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The surface of graphene (GE) was modified with a silane coupling agent, and its surface characteristics were investigated. Epoxy resin/GE nanocomposites were prepared via solution blending. The effect of the GE content on the thermal stability, flexural properties, impact strength, and morphology of the nanocomposites was studied. The thermal stability of the epoxy resin increased with the addition of pristine GE and surface‐modified GE. The flexural strength, elastic modulus, and impact strength of the nanocomposites with surface‐modified GE increased significantly with increasing GE content. Scanning electron microscopy images of the nanocomposites with surface‐modified GE show a ductile deformation morphology, which is consistent with their high impact strength.

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Section: Resultsmentioning

confidence: 96%

Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

Jin

Guo

et al. 2019

Bulletin Korean Chem Soc

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“…The reaction was conducted in oven at 120 °C for 12 h. In the TEM image of Fe 3 O 4 @SiO 2 @P4VP‐PDMS‐P4VP hybrid NPs (Figure c), the outer shell of the grafted block copolymers can be seen clearly, indicating that the grafting was successful. The formed Fe 3 O 4 @SiO 2 @P4VP‐PDMS‐P4VP hybrid NPs were also examined by TGA and FT‐IR techniques for the chemical composition evaluation . As shown in Figure S2 (Supporting Information), native Fe 3 O 4 NPs and Fe 3 O 4 @SiO 2 NPs have only a tiny weight loss from 100 to 800 °C, while a clear stage was found in the TGA cure of the Fe 3 O 4 @SiO 2 @P4VP‐PDMS‐P4VP hybrid NPs by contrast.…”

Section: Resultsmentioning

confidence: 99%

pH‐Responsive Poly(dimethylsiloxane) Copolymer Decorated Magnetic Nanoparticles for Remotely Controlled Oil‐in‐Water Nanoemulsion Separation

Yang

Loh

Tan

et al. 2018

Macromol. Rapid Commun.

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A smart and recyclable oil absorber based on pH-responsive block copolymer modified magnetic nanoparticles is constructed for effective separation of oil-in-water emulsions. Superparamagnetic iron(III) oxide (Fe O ) nanoparticles are designed as the core materials for providing the separation force, and surface modification with poly(4-vinylpyridine-b-dimethyl siloxane-b-4-vinylpyridine) (P4VP-PDMS-P4VP) block copolymer is performed to supply switchable oil wettability. The mean hydrodynamic radius of the nanoparticles increases from 43.8 ± 3.6 to 75.2 ± 5.3 nm when the neutral pH is reduced to 3, due to the protonation and subsequent swelling of P4VP segments at lower pH. The nanoparticles show excellent separation performance and can absorb octadecene up to 78.2 times of their own weight, simply by switching the pH of the oil-in-water emulsion treated with the nanoparticles and using a magnetic field. The different dipole of P4VP-PDMS-P4VP and protonated P4VP-PDMS-P4VP, as confirmed by density functional theory calculations, is responsible for the different oil miscibility and wettability of the nanoparticles.

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“…As for XRD, single PLLA hemisphere displays a strong characteristic diffraction peak at 2 θ = 16.5 accompanied by two weak peaks at 14.9° and 19.0°, respectively (Figure B, curve a). These peaks are derived from the crystal structure of PLLA . For Janus star‐like copolymer (PLLA) 8 ‐ b‐ (PS) 8 , one can see that the typical peak at 16.5° representing the crystal structure of PLLA segments still can be observed clearly and its intensity is also not affected despite the presence of the amorphous PS segments (Figure B, curve b).…”

Section: Methodsmentioning

confidence: 96%

“…Synthesis of novel macromolecular architecture with well‐defined structures and compositions has been an important research topic in polymer science . Thanks to the advances in polymerization techniques, numerous well‐organized polymers have been prepared over the past few decades .…”

Section: Methodsmentioning

confidence: 99%

Precise Synthesis of PS‐PLA Janus Star‐Like Copolymer

Fan

Win

et al. 2018

Macromol. Rapid Commun.

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In this work, an efficient strategy is designed for the precise synthesis of novel Janus star-like copolymer (polystyrene) -b-(poly(l-lactide)) , (PLLA) -b-(PS) , consisting of two types of chemically distinct polymer arms, PS and PLLA, in an asymmetric structure. During the synthesis, PLLA hemisphere carrying protected hydroxyl groups at the focal point was first synthesized via a combined reactions of esterification, light-induced "Click" chemistry, and ring opening polymerization (ROP) using a specially designed dendron as initiator. After removing the protecting moiety, the terminal hydroxyl groups on the dendron segment is increased fourfold and further modified into bromopropionate-based macroinitiator through a two-step end group transformation reaction, followed by atom transfer radical polymerization (ATRP) of styrene to obtain the desired (PLLA) -b-(PS) Janus star-like copolymer. The versatility and efficiency of the designed synthetic strategy are demonstrated by the well-defined molecular characteristics and high yields of the targeted product. In addition to the controlled degradation behavior of the PLLA segments, the remaining bromide groups located at the distal end of PS arms could allow for further fabrication of diverse building blocks through consecutive ATRP of various monomers. This work signifies the first time for facile and precise synthesis of Janus star-like copolymer with unique biphasic structure and function control.

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Biodegradable silica rubber core-shell nanoparticles and their stereocomplex for efficient PLA toughening

Cited by 84 publications

References 42 publications

Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

Effect of Surface Modification on Thermal Stability, Flexural Properties, and Impact Strength of Epoxy/Graphene Nanocomposites

pH‐Responsive Poly(dimethylsiloxane) Copolymer Decorated Magnetic Nanoparticles for Remotely Controlled Oil‐in‐Water Nanoemulsion Separation

Precise Synthesis of PS‐PLA Janus Star‐Like Copolymer

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