Investigation of readily processable thermoplastic‐toughened thermosets. V. Epoxy resin toughened with hyperbranched polyester

Wu, Hung-Yi; Xu, Jun; Liu, Y.; Heiden, Patricia A.

doi:10.1002/(sici)1097-4628(19990411)72:2<151::aid-app1>3.3.co;2-s

Cited by 9 publications

(13 citation statements)

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“…Furthermore, the 20 wt % HPE addition leads to a maximum K 1c value (1.90 MPa m 1/2 ), which is approximately 37% higher than the value of the neat EB600 resin. In a conclusion, HUA or HPE addition can improve effectively the toughness of blends, as reported in the literature 11–13…”

Section: Resultssupporting

confidence: 66%

Properties and morphologies of UV‐cured epoxy acrylate blend films containing hyperbranched polyurethane acrylate/hyperbranched polyester

Xu¹,

Zhao²,

Shi³

2005

J Polym Sci B Polym Phys

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The properties and morphologies of UV‐cured epoxy acrylate (EB600) blend films containing hyperbranched polyurethane acrylate (HUA)/hyperbranched polyester (HPE) were investigated. A small amount of HUA added to EB600 improved both the tensile strength and elongation at break without damaging its storage modulus (E′). The highest tensile strength of 31.9 MPa and an elongation at break around two times that of cured pure EB600 were obtained for the EB600‐based film blended with 10% HUA. Its log E′ (MPa) value was measured to be 9.48, that is, about 98% of that of the cured EB600 film. The impact strength and critical stress intensity factor (K1c) of the blends were investigated. A 10 wt % HUA content led to a K1c value 1.75 times that of the neat EB600 resin, and the impact strength of the EB600/HPE blends increased from 0.84 to 0.95 kJ m−1 with only 5 wt % HPE addition. The toughening effects of HUA and HPE on EB600 were demonstrated by scanning electron microscopy photographs of the fracture surfaces of films. Moreover, for the toughening mechanism of HPE to EB600, it was suggested that the HPE particles, as a second phase in the cured EB600 film, were deformed in a cold drawing, which was caused by the difference between the elastic moduli of HPE and EB600. © 2005 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 43: 3159–3170, 2005

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Section: Resultssupporting

confidence: 66%

Properties and morphologies of UV‐cured epoxy acrylate blend films containing hyperbranched polyurethane acrylate/hyperbranched polyester

Xu¹,

Zhao²,

Shi³

2005

J Polym Sci B Polym Phys

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“…The result indicated that there might be a chemical reaction between the HBPU and epoxy, which resulted in a crosslinking structure in the blends. However, that phenomenon was not observed in HBP/epoxy system . Thus, the process of HBPU blending with epoxy resin should be operated under 120°C.…”

Section: Resultsmentioning

confidence: 97%

“…The typical hyperbranched polymers toughening epoxy resin are hyperbranched polyesters (HBP), and a lot of studies have been carried out during the decades. It has been shown that the hydroxyl‐terminated HBPs could effectively toughen epoxy resin but significantly decrease both T g and E ′ to various degrees because of the incomplete phase separation of thermosets. On the other hand, the epoxy‐functionalized HBPs could improve the toughness of epoxy thermosets several times, much higher compared with hydroxyl terminal HBPs, without introducing negative effects on thermal and mechanical properties.…”

Section: Introductionmentioning

confidence: 99%

Highly efficient in situ toughening of epoxy thermosets with reactive hyperbranched polyurethane

Tang

Liu

Zhao

et al. 2014

J of Applied Polymer Sci

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Hyperbranched polyurethane (HBPU), with low‐molecular‐weight polyethylene glycol space segments between the branching points, was synthesized by a pseudo one‐pot procedure. HBPU was characterized by Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and gel permeation chromatography. The HBPU was used as a modifier of diglycidyl ether of bisphenol A (DGEBA)/anhydride system. The rheological properties of HBPU‐G3/DGEBA blends were investigated by rotational rheometer. A slight decrease in viscosity of modified blends was observed by adding low content of HBPU and there was chemical reaction between HBPU and epoxy resin even without a hardener. The mechanical and thermal properties of the HBPU‐G3/DGEBA thermosets were characterized and compared with that of the neat epoxy thermosets. Their impact fracture surfaces were investigated by scanning electron microscopy, and the results indicated that no phase separation occurred in the DGEBA/anhydride system after the introduction of HBPU, which was confirmed by dynamic mechanical analysis and thermogravimetric analysis. After addition of 10 wt % HBPU, the toughness of the modified thermosets was found to be significantly improved without sacrificing their processability and thermal and mechanical properties to a large extent. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014, 131, 40614.

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“…If two or three monomer layers exist around the core, the species is termed G2 and G3 HBP, respectively [67]. They are not true genealogical species, that is, each layer of monomers is not built up in a separate reaction step around the central core.…”

Section: Morphology Of the Hyperbranched Polymer Modified Epoxy And Imentioning

confidence: 99%

“…seems intuitive to modify the system compatibility by varying the molar mass, or generation of the HBP, however, changing the size of a HBP modifier has little effect on compatibility [65,67]. As pointed out by different research groups [65,67,71], the chemistry Figure 6.13 Chemical structure of (a) hydroxyl-terminated G3 HBP [67] and (b) epoxy-functionalized G5 HBP [93].…”

Section: Shell Chemistrymentioning

confidence: 99%

Nanostructure Formation in Thermoset/Block Copolymer and Thermoset/Hyperbranched Polymer Blends

Meng

Zhang

2014

Nanostructured Polymer Blends

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Investigation of readily processable thermoplastic‐toughened thermosets. V. Epoxy resin toughened with hyperbranched polyester

Cited by 9 publications

References 0 publications

Properties and morphologies of UV‐cured epoxy acrylate blend films containing hyperbranched polyurethane acrylate/hyperbranched polyester

Properties and morphologies of UV‐cured epoxy acrylate blend films containing hyperbranched polyurethane acrylate/hyperbranched polyester

Highly efficient in situ toughening of epoxy thermosets with reactive hyperbranched polyurethane

Nanostructure Formation in Thermoset/Block Copolymer and Thermoset/Hyperbranched Polymer Blends

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