Effective reinforcement of epoxy composites with hyperbranched liquid crystals grafted on microcrystalline cellulose fibers

Luo, Qiyun; Li, Yuqi; Pan, Leilei; Song, Laifu; Yang, Jinling; Wu, Lingyan; Lu, Shaorong

doi:10.1007/s10853-016-0136-9

Cited by 14 publications

(15 citation statements)

References 34 publications

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“…It is obvious that the T g of epoxy nanocomposites is overall lower than that of EP0 and decreases with the growth of filler loading concentrations, though EPB5 shows an enhancement of T g . This phenomenon should be, first, due to the lower cross-linking density of epoxy nanocomposites [5,9,25]. Second, the surface characteristics of nanoparticles and the interfacial region between the polymer matrix and nanofillers can be used to explain the behaviours of T g .…”

Section: Dsc Experimentsmentioning

confidence: 99%

“…Moreover, they also pointed out the presence of hydroxyl groups on SiO 2 surface affected and led to worse thermal properties as well. Luo et al introduced an interface designed epoxy nanocomposite systems filled with microcrystalline cellulose fibers (MCFs) [9], in which NCs showed enhanced thermal stability as a consequence of improved cross-linking density and glass transition temperature (T g ). Their work proved the strong interfacial interactions could significantly improve the thermal stability of epoxy NC systems.…”

Section: Introductionmentioning

confidence: 99%

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Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO₂ and hBN fillers

Qiang

Wang

et al. 2019

Mater. Res. Express

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Epoxy resin is one of the most commonly used thermosetting macromolecular synthetic materials. It displays excellent adhesiveness properties, good dielectric property, mechanical property and chemical stability. Consequently, epoxy resins have been widely used for many industrial purposes, such as electrical casting into power transformers, ignition coil systems and potting. In this paper, TGA and DSC measurements were carried out to evaluate the thermal stability of epoxy nanocomposites. Based on the results of dispersion and distribution of particles within epoxy nanocomposites, it concluded that both presences of nano SiO 2 and hexagonal BN (hBN) particles have obvious impact on base materials in which the influences of latter particle are much more significant due to its shape, and thus both fillers leads to worse thermal stability than pure samples. However, particles could act as flame retardants in polymer nanocomposites and postpone the initiation of decomposition by hindering/slowing the oxidisation. When compared within two SiO 2 based nanocomposites, the surface treatment seems to help mitigate the influences on base materials by achieving better filler dispersion and modify the cross-linking density at the interfacial areas by removing surface functional groups.

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Section: Dsc Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO₂ and hBN fillers

Qiang

Wang

et al. 2019

Mater. Res. Express

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“…The epoxy nanocomposite films are transparent and flexible and exhibit an exceptionally high tensile modulus and strength. In our previous work, microcrystallinecellulose fibers (MCFs), were modified by hyperbranched liquid crystals (HLP) to improve the wettability and interactions between the MCFs and epoxy resin [ 24 ].…”

Section: Instructionmentioning

confidence: 99%

High Mechanical and Thermal Properties of Epoxy Composites with Liquid Crystalline Polyurethane Modified Graphene

Gao

Liu

et al. 2018

Polymers

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Graphene nanosheets (GNs) often result in incompatibility with the hydrophobic polymer matrix, and the tendency to form aggregates during processing. Herein, liquid crystalline polyurethane modified GNs (GPLP) were obtained by π–π stacking interactions between GNs and perylene bisimide derivatives, and then in-situ polymerization of liquid-crystalline polyurethane. Spectroscopic studies, elemental analysis, and thermal properties confirmed the successful π–π stacking and the integrated structure of GPLP. The good dispersion state of GPLP in the epoxy matrix (EP), and the strong interactions between GPLP and EP, lead to the significant improvement of the thermal and mechanical performance of the GPLP/EP composites. The impact strength, Young’s modulus, tensile strength, and toughness of the GPLP/EP composites with 1.47 wt % GNs reached the highest values of 54.31 kJ/m2, 530.8 MPa, 112.33 MPa and 863 J/m3, which significantly increased by 210%, 57%, 143%, and 122% compared to that of neat epoxy, respectively. As well, the glass transition temperature increased by a notable 33 °C. It is hoped that this work can be used to exploit more efficient methods to overcome the poor adhesion between GNs and polymers.

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“…Cellulose is one of the most abundant, renewable, and environmentally friendly natural macromolecular resources, which offers low price and density, high specific strength, degradability, and non-toxicity. Cellulose has become one of the most concerned polymer reinforcing materials [11,12,13,14]. However, due to its supramolecular structure, cellulose cannot dissolve in water or most organic solvents, which greatly restricts the modification of cellulose [15].…”

Section: Introductionmentioning

confidence: 99%

Preparation and Characterization of DOPO-ITA Modified Ethyl Cellulose and Its Application in Phenolic Foams

Gong

Liao

et al. 2018

Polymers

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In order to improve the performance of phenolic foam, an additive compound of 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide (DOPO) and Itaconic acid (ITA) were attached on the backbone of ethyl cellulose (EC) and obtained DOPO-ITA modified EC (DIMEC), which was used to modify phenolic resin and composite phenolic foams (CPFs). The structures of DOPO-ITA were verified by Fourier transform infrared spectroscopy (FT-IR) and nuclear magnetic resonance (1H NMR). The molecular structure and microstructure were characterized by FT-IR spectra and SEM, respectively. Compared with EC, the crystallinity of DIMEC was dramatically decreased, and the diffraction peak positions were basically unchanged. Additionally, thermal stability was decreased and Ti decreased by 24 °C. The residual carbon (600 °C) was increased by 25.7%. With the dosage of DIMEC/P increased, the Ea values of DIMEC composite phenolic resins were increased gradually. The reaction orders were all non-integers. Compared with PF, the mechanical properties, flame retardancy, and the residual carbon (800 °C) of CPFs were increased. The cell size of CPFs was less and the cell distribution was relatively regular. By comprehensive analysis, the suitable dosage of DIMEC/P was no more than 15%.

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Effective reinforcement of epoxy composites with hyperbranched liquid crystals grafted on microcrystalline cellulose fibers

Cited by 14 publications

References 34 publications

Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO₂ and hBN fillers

Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO₂ and hBN fillers

High Mechanical and Thermal Properties of Epoxy Composites with Liquid Crystalline Polyurethane Modified Graphene

Preparation and Characterization of DOPO-ITA Modified Ethyl Cellulose and Its Application in Phenolic Foams

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Effective reinforcement of epoxy composites with hyperbranched liquid crystals grafted on microcrystalline cellulose fibers

Cited by 14 publications

References 34 publications

Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO2 and hBN fillers

Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO2 and hBN fillers

High Mechanical and Thermal Properties of Epoxy Composites with Liquid Crystalline Polyurethane Modified Graphene

Preparation and Characterization of DOPO-ITA Modified Ethyl Cellulose and Its Application in Phenolic Foams

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Product

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Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO₂ and hBN fillers

Thermal stability of epoxy nanocomposites: surface treatment and morphology impact based on nano SiO₂ and hBN fillers