Hyperbranched polymers as modifiers of epoxy adhesives

Buonocore, Giovanna G.; Schiavo, Loredana; Attianese, Ilaria; Borriello, Anna

doi:10.1016/j.compositesb.2013.04.062

Cited by 60 publications

(32 citation statements)

References 18 publications

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“…In recent decades, hyperbranched polymers (HBPs) have drawn extensive attention because of their wide applications in various fields, for example, light emitting materials, nanoscience and technology, supramolecular chemistry, biomaterials, hybrid materials and composites, coatings, adhesives, and modifiers . HBPs have exhibited many intriguing physical and chemical properties benefiting from their highly branched architecture with plenty of terminal groups, inner cavities, and lack of chain entanglements .…”

Section: Introductionmentioning

confidence: 99%

Crystallization behavior of hyperbranched polyethylenes with different degree of branching

Luo

Huang

Yan

2016

J of Applied Polymer Sci

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Hyperbranched polyethylenes (HBPEs) with different degree of branching (DB) and similar M n are used to investigate the effect of branch structure on their crystallization behaviors. The crystal structure, isothermal, and non-isothermal crystallization kinetics of HBPEs are studied by X-ray diffraction and differential scanning calorimetry. The isothermal crystallization process is analyzed by the Avrami equation while the non-isothermal crystallization process is analyzed through the Ozawa and Mo methods. The XRD results indicate that the crystallization ability of HBPEs is weakened with the introduction of branch structure, i.e., the crystallinity of HBPEs decreases with the increase of DB, and even tends to zero. The kinetics results of isothermal and non-isothermal crystallization verify the peculiar effects of DB on the crystallization process of HBPEs. In detail, a little of branch structure can accelerate the crystallization process of HBPEs, however a large number of branch can inhibit it.

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Section: Introductionmentioning

confidence: 99%

Crystallization behavior of hyperbranched polyethylenes with different degree of branching

Luo

Huang

Yan

2016

J of Applied Polymer Sci

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“…In addition, information on homogeneity and miscibility can be revealed by the shape and width of tan δ peaks . As shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Curing behavior and thermal and mechanical properties enhancement of tetraglycidyl-4,4′-diaminodiphenylmethane/4,4′-diaminodiphenylsulfone using a liquid crystalline epoxy

et al. 2016

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A thermosetting resin system, based on tetraglycidyl-4,4 ′ -diaminodiphenylmethane, has been developed via copolymerization with 4,4 ′ -diaminodiphenylsulfone in the presence of a newly synthesized liquid crystalline epoxy (LCE). The curing behavior of LCE-containing resin system was evaluated using curing kinetics method and Fourier transform infrared spectroscopy. The effect of LCE on the thermal and mechanical properties of modified epoxy systems was studied. Thermogravimetric analysis indicated that the modified resin systems displayed a high T 0.05 and char yield at lower concentrations of LCE (≤5 wt%), suggesting an improved thermal stability. As determined using dynamic mechanical analysis and differential scanning calorimetry, the glass transition value increased by 9.7% compared to that of the neat resin when the LCE content was 5 wt%. Meanwhile, the addition of 5 wt% of LCE maximized the toughness with a 175% increase in impact strength. The analysis of fracture surfaces revealed a possible effect of LCE as a toughener and showed no phase separation in the modified resin system, which was also confirmed by dynamic mechanical analysis.

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“…CSPs can induce stress concentrations, which lead to extensive shear deformation. 44 When cracks initiate, the shear deformation can absorb fracture energy 51 and interrupt crack propagation. The CSPs disperse uniformly in this thermoset, which indicates the good compatibility between CSPs and epoxy matrix in the HBPH.…”

Section: Morphological Analysismentioning

confidence: 99%

The effect of core–shell particles on the mechanical performance of epoxy resins modified with hyperbranched polymers

Lin

Cui

2016

J. Mater. Res.

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A novel core-shell particle that consists of epoxide-terminated hyperbranched polymer (HBP) and silica nanoparticles was incorporated into an epoxy/hydroxyl-terminated HBP blend to fabricate a high-performance epoxy thermoset. The effect of the core-shell particle content on the mechanical properties of the epoxy thermosets was investigated in detail. Results from tensile, flexural, and impact tests are provided. The impact fracture surface was studied by field emission-scanning electron microscopy. The incorporation of 2 wt% core-shell particles improved the tensile strength, percent elongation at break, flexural strength, and impact resistance of epoxy/hydroxyl-terminated HBP thermosets. Field emission-scanning electron micrographs showed that core-shell particle addition resulted in large-scale shear deformation and debonding from the epoxy matrix, and improved the epoxy resin toughness.

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Hyperbranched polymers as modifiers of epoxy adhesives

Cited by 60 publications

References 18 publications

Crystallization behavior of hyperbranched polyethylenes with different degree of branching

Crystallization behavior of hyperbranched polyethylenes with different degree of branching

Curing behavior and thermal and mechanical properties enhancement of tetraglycidyl-4,4′-diaminodiphenylmethane/4,4′-diaminodiphenylsulfone using a liquid crystalline epoxy

The effect of core–shell particles on the mechanical performance of epoxy resins modified with hyperbranched polymers

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