Mechanical Properties and Morphology Studies of Thermosets from a Liquid‐Crystalline Epoxy Resin with Biphenol and Aromatic Ester Groups

Liu, Yinling; Cai, Zhi‐Qi; Wang, Weicheng; Wen, Xiufang; Pi, Pihui; Zheng, Dafeng; Cheng, Jiang; Yang, Zhen

doi:10.1002/mame.201000270

Cited by 10 publications

(3 citation statements)

References 37 publications

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“…4, 4’‐biphenol (DOD) is an organic intermediate with high melting point (281 °C) and good heat resistance, which makes it a common rubber antioxidant and plastic antioxidant. When polyolefin products are processed or applied in high‐temperature conditions, composite additives migrate and get volatilized, resulting in quality degradation or even disqualification . To prevent loss of additives, a lot of measures can be taken, including (1) Blocking method, such as adding flake montmorillonite or adsorbent; (2) Grafting or polymerizing micro‐molecules into polymer; (3) Improving molecular weight of the additive by modifying or polymerizing.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of A Novel Cyclotriphosphazene and Its Enhancement of Anti‐aging and Flame Retardancy of Polyolefin

et al. 2020

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A novel cyclotriphosphazene polymer (PDP) was synthesized by one-step method with hexachlorocyclotriphosphazene (HCCP) and 4,4'-biphenol (DOD) as raw materials. The effects of different reaction time and molar ratio of reactants on PDP yield and molecular weight were investigated. The results showed that when the reaction time reached 60 min, the yield and the molecular weight of PDP was the highest. The yield of PDP decreased with the increase of the molar ratio of HCCP to DOD, when the ratio of HCCP to DOD was 3 : 3, the molecular weight of PDP reached the maximum. The characterization results of FTIR and XPS showed that the method can effectively prepared PDP. XRD result showed that the PDP was noncrystalline polymer. The synthesized PDP was applied to the polyolefin cable materials by electron beam radiation crosslinking method. The results of aging experiments showed that the limiting oxygen index (LOI) of the samples increased from 20% to 21.6% with the addition of 5phr PDP. As for the sample without PDP, the elongation at break was reduced to almost 0 in 12 h and tensile strength to 0 in 25 h. However, the elongation of the sample with 5phr PDP still kept 30% in 100 h, and the tensile strength kept 90% in 100 h. It shows that PDP has good flame retardancy and excellent anti-aging properties.

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Section: Introductionmentioning

confidence: 99%

Synthesis of A Novel Cyclotriphosphazene and Its Enhancement of Anti‐aging and Flame Retardancy of Polyolefin

et al. 2020

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“…When the material is subjected to external forces, these mesomorphic domains can withstand and disperse the stress; this hinders crack propagation, and therefore, the material exhibits a high toughness . With their good mechanical properties, chemical resistance, low shrinkage properties during the curing process, and higher fracture toughness compared with general thermosetting resins, LCTs have been developed to improve the mechanical and thermal properties of conventional thermosets and to overcome the drawbacks of other modification methods.…”

Section: Introductionmentioning

confidence: 99%

Synthesis, characterization, and properties of thermosets based on the cocuring of an acetylene‐terminated liquid‐crystal and silicon‐containing arylacetylene oligomer

Han

Guo

Wang

et al. 2017

J of Applied Polymer Sci

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A thermotropic acetylene-terminated liquid-crystal monomer, 2-methyl-1,4-phenylene bis(4-ethynylbenzoate) (MPBE), was prepared and used as a modification composition to react and cocure with a silicon-containing arylacetylene (PSA) oligomer for improving PSA resin. The curing behavior of the PSA-MPBE resins were characterized by differential scanning calorimetry and Fourier transform infrared spectroscopy. The microstructure and morphology of the PSA-MPBE resins were investigated by scanning electron microscopy (SEM) and transmission electron microscopy. Their dynamic mechanical properties and thermostability were measured by dynamic mechanical analysis (DMA) and thermogravimetric analysis. The results indicate that the thermotropic acetylene-terminated liquid-crystal monomer melted into a schlieren texture. MPBE and PSA could copolymerize to fix the mesogenic domain in the crosslinked network and form a homogeneous-phase sea-island structure, which improved the rigidity and toughness of the materials. DMA showed that the storage modulus of the PSA-MPBE resins increased by about 400 MPa compared to the those of the pure components. The SEM experiments showed a noticeable change in the morphology, from a typical brittle fracture for the pure PSA to microplastic deformation behavior for the PSA-MPBE resins.

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“…3,3′,5,5′-Tetramethylbiphenyl-4,4′-diylbis(4-(oxiran-2-ylmethoxy) benzoate) ( M1 ) was synthesized with a high efficient and economical method [ 15 ]. Effects on modifying diglycidyl ether of bisphenol A (DGEBA)/4,4′-diaminodiphenyl methane (DDM) revealed that the izod notched impact strength could be enhanced by 55% by the addition of 2% M1 compared to unmodified DGEBA blends [ 16 , 17 ]. With respect to its excellent performance in improving mechanic and thermal properties of ordinary commercial epoxy resin, a good performance on modifyingnylon66 ( M2 ) will be a reasonable expectation.…”

Section: Introductionmentioning

confidence: 99%

Thermal Properties and Crystallite Morphology of Nylon 66 Modified with a Novel Biphenyl Aromatic Liquid Crystalline Epoxy Resin

Cai

Mei

et al. 2013

IJMS

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In order to improve the thermal properties of important engineering plastics, a novel kind of liquid crystalline epoxy resin (LCER), 3,3′,5,5′-Tetramethylbiphenyl-4,4′-diyl bis(4-(oxiran-2-ylmethoxy)benzoate) (M1) was introduced to blend with nylon 66 (M2) at high temperature. The effects of M1 on chemical modification and crystallite morphology of M2 were investigated by rheometry, thermo gravimetric analysis (TGA), dynamic differential scanning calorimetry (DSC) and polarized optical microscopy (POM). TGA results showed that the initial decomposition temperature of M2 increased by about 8 °C by adding 7% wt M1, indicating the improvement of thermal stability. DSC results illustrated that the melting point of composites decreased by 12 °C compared to M2 as the content of M1 increased, showing the improvement of processing property. POM measurements confirmed that dimension of nylon-66 spherulites and crystallization region decreased because of the addition of liquid crystalline epoxy M1.

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Mechanical Properties and Morphology Studies of Thermosets from a Liquid‐Crystalline Epoxy Resin with Biphenol and Aromatic Ester Groups

Cited by 10 publications

References 37 publications

Synthesis of A Novel Cyclotriphosphazene and Its Enhancement of Anti‐aging and Flame Retardancy of Polyolefin

Synthesis of A Novel Cyclotriphosphazene and Its Enhancement of Anti‐aging and Flame Retardancy of Polyolefin

Synthesis, characterization, and properties of thermosets based on the cocuring of an acetylene‐terminated liquid‐crystal and silicon‐containing arylacetylene oligomer

Thermal Properties and Crystallite Morphology of Nylon 66 Modified with a Novel Biphenyl Aromatic Liquid Crystalline Epoxy Resin

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