Control of inclusion size and toughness by reactivity of multiblock copolymer in epoxy composites

He, Rujie; Zhan, Xiaoli; Zhang, Qinghua; Zhang, Guangfa; Chen, Fengqiu

doi:10.1016/j.polymer.2016.04.003

Cited by 16 publications

(14 citation statements)

References 55 publications

(69 reference statements)

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“…55 The innovative reactive blending work of He and his group provides an insight on developing toughened epoxy thermosets utilized for both high and low fracture rates. 56 With the introduction of a new family of reactive block copolymer, poly[styrene-alt-(maleic anhydride)]-block-polystyrene-block-poly(n-butyl acrylate)-block-polystyrene, with different reactivity in epoxy blends, they were able to control the inclusion size of reactive block copolymer in cured blends from nanometer to micrometer by simply adjusting the fraction of the reactive block in reactive block copolymer. The systematic study on the structure-property relationship revealed that the thermal and mechanical properties of modified blends strongly depend on inclusion size.…”

Section: Toughness Enhanced Resinsmentioning

confidence: 99%

Multifunctionality in Epoxy Resins

2019

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Epoxy resin will continue to be in the forefront of many thermoset applications due to its versatile properties. However, with advancement in manufacturing, changing societal outlook for the chemical industries and emerging technologies that disrupt conventional approaches to thermoset fabrication, there is a need for a multifunctional epoxy resin that is able to adapt to newer and robust requirements. Epoxy resins that behave both like a thermoplastic and a thermoset resin with better properties are now the norm in research and development. In this paper, we viewed multifunctionality in epoxy resins in terms of other desirable properties such as its toughness and flexibility, rapid curing potential, self-healing ability, reprocessability and recyclability, high temperature stability and conductivity, which other authors failed to recognize. These aspects, when considered in the synthesis and formulation of epoxy resins will be a radical advance for thermosetting polymers, with a lot of applications. Therefore, we present an overview of the recent finding as to pave the way for varied approaches towards multifunctional epoxy resins.

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Section: Toughness Enhanced Resinsmentioning

confidence: 99%

Multifunctionality in Epoxy Resins

2019

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“…These suggest that under LOPB content lower than 20 wt % in the blends the LOPB particles were relatively evenly distributed throughout the epoxy matrix to obtain more homogeneous particle size/distribution which was considered playing an important role in improving the overall performances of epoxy blends . Similarly, evenly dispersed reactive rubber particles in the matrix in certain range of reactive component addition were found by He et al . and Wang et al, which were attributed to the interfacial compatibilization of in situ reaction between the two phases.…”

Section: Resultsmentioning

confidence: 74%

“…He et al reported their series studies on reactive blends, and they found that the addition of 10 wt % reactive block copolymers (BCPs) into the epoxy resins led to considerable improvements in the toughness, imparting nearly a 70% increase in Kc . In their more systematical study, the reactivity and amount of BCPs were found influencing their inclusion sizes in epoxy matrix, and the blends achieved substantially increase in toughness and impact without loss in T g by proper controlling the amount of BCPs with tailored reactivity . Furthermore, these BCPs were synthesized as unimodal reactive core‐shell particles to blend with epoxy, and at an amount of 8%, these particle could be well dispersed in the epoxy matrix and the blends could be greatly toughened with simultaneous improvement in T g .…”

Section: Introductionmentioning

confidence: 99%

Thermal, mechanical, and dielectric studies on the DGEBA epoxy blends by using liquid oxidized poly(1,2‐butadiene) as a reactive component

Gao

Wang

2017

J of Applied Polymer Sci

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Liquid oxidized poly(1,2-butadiene) (LOPB) with multi epoxy groups is synthesized to modify diglycidyl end-caped poly(bisphenol A-co-epichlorohydrin) (DGEBA) cured by 4,4 0 -diaminodiphenyl sulfone (DDS). FTIR spectra shows that DGEBA and LOPB can be effectively cured by DDS, and the epoxide rubber particles are evenly distributed in the composites till their addition up to 20 wt % of DGEBA as seen from the scanning electron microscope (SEM). Their decomposition temperatures (Td) increase with the increase in LOPB addition at around 10 wt % of DGEBA while the Td for the composite containing 20 wt % LOPB of DGEBA is lower than that of the neat epoxy. The addition of LOPB improves their storage moduli and especially these values at temperatures higher above 150 8C; all the composites exhibit higher glass transition temperature (T g ) than that of the neat epoxy, and the maximum T g reaches up to 255 8C for the composite containing 15 wt % LOPB of DGEBA. The incorporation of LOPB effectively decreases their dielectric constants and the composite with 10 wt % LOPB of DGEBA possesses the lowest one. The synergic improvements in their various properties are attributed to the networks formation via covalent linkage between the two phases in these reactive blends.

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“…found that compared with the pure PLA, the impact toughness of PLA/EPB blend was improved by 13 times, while the tensile strength still preserved as a level of 77% relative to that of pure PLA; the epoxy group of EPB played a significant role in enhancing compatibility between rubber phase and PLA matrix, due to the formation of graft‐copolymer between EPB and PLA in the curing process, as well as a remarkable decrease in the particle diameter of rubber phase. By introducing reactive block copolymer (RBCP), He et al . found that compared to that of the neat epoxy ( K IC = 0.83 MPa m 1/2 ), the K IC value of the blend reached up to 2.05 MPa m 1/2 when the content of RBCP was added at 15 wt %, suggesting the significant improvement in fracture toughness, and the blend with 5 wt % RBCP was even observed a slight increase in T g .…”

Section: Introductionmentioning

confidence: 99%

Preparation and characterizations of RTV epoxy blends using amide maleic anhydride‐g‐liquid polybutadience as both reactive toughening and curing components

Wang

2017

J of Applied Polymer Sci

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Amide maleic anhydride‐g‐liquid polybutadience (AMALPB) was synthesized using maleic anhydride‐g‐liquid polybutadience (MALPB) with ethylenediamine (EDA), and its structure was confirmed by FTIR and 1H‐nuclear magnetic resonance spectra, respectively. It was then used as a reactive toughening agent to make blends with diglycidyl end‐capped poly(bisphenol‐A‐co‐epichlorohydrin epoxy cured at room temperature. Their thermal decomposing behaviors did not show much difference because both EDA and AMALPB possessed similar aliphatic groups. All their glass transition temperatures (Tg) increased more than 10 °C than that of the neat epoxy, and with the addition of AMALPB, the blends were greatly strengthened upon heating as show from their storage moduli. When AMALPB was added at 10 wt %, its elongation at break increases to a maximum of 8.8% which was about two times higher than that of the neat epoxy, and its tensile strength also increased. However, the excessive addition of AMALPB resulted in an apparent decline in their tensile strength at content above 20%. The simultaneous improvements in both tensile strength and strain were attributed to the existence of well‐dispersed rubber particles in the continuous matrices performing plastic deformation that resulted from the chemical bonds of interfaces among the rubber particles and matrix, and meanwhile, inducing the deflection of the cracks. © 2017 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2018, 135, 45985.

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Control of inclusion size and toughness by reactivity of multiblock copolymer in epoxy composites

Cited by 16 publications

References 55 publications

Multifunctionality in Epoxy Resins

Multifunctionality in Epoxy Resins

Thermal, mechanical, and dielectric studies on the DGEBA epoxy blends by using liquid oxidized poly(1,2‐butadiene) as a reactive component

Preparation and characterizations of RTV epoxy blends using amide maleic anhydride‐g‐liquid polybutadience as both reactive toughening and curing components

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