Enhancing mechanical performance of epoxy thermosets via designing a block copolymer to self-organize into “core–shell” nanostructure

Heng, Zhengguang; Zeng, Zhong; Zhang, Bin; Luo, Yinfu; Luo, Jiemin; Zou, Huawei; Liang, Mei

doi:10.1039/c6ra15283j

Cited by 19 publications

(16 citation statements)

References 25 publications

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“…Researchers have been working to toughen epoxy and broaden its use in more demanding applications. To achieve this purpose, a variety of reinforcements, including liquid rubber tougheners, [6][7][8] coreshell rubber (CSR) particles, [9][10][11][12][13][14][15][16][17][18][19] thermoplastics, 20,21 and inorganic ller [22][23][24] have been used. However, sometimes these led to a decrease in glass transition temperature, modulus and tensile strength of the epoxy matrix.…”

Section: Introductionmentioning

confidence: 99%

Enhanced toughness and thermal conductivity for epoxy resin with a core–shell structured polyacrylic modifier and modified boron nitride

Zhang

et al. 2019

RSC Adv.

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Section: Introductionmentioning

confidence: 99%

Enhanced toughness and thermal conductivity for epoxy resin with a core–shell structured polyacrylic modifier and modified boron nitride

Zhang

et al. 2019

RSC Adv.

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“…The tendency of styrene segments to form associate (either in solution or in melt) has been studied and utilized for increasing toughness of polymers [30]. This can be the reason for the enhanced compressive resistance of the swollen polySMA hydrogels as was described above in the Section 3.2.…”

Section: Resultsmentioning

confidence: 99%

Hydrogel Tissue Expanders for Stomatology. Part II. Poly(styrene-maleic anhydride) Hydrogels

et al. 2019

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Self-inflating soft tissue expanders represent a valuable modality in reconstructive surgery. For this purpose, particularly synthetic hydrogels that increase their volume by swelling in aqueous environment are used. The current challenge in the field is to deliver a material with a suitable protracted swelling response, ideally with an induction period (for sutured wound healing) followed by a linear increase in volume lasting several days for required tissue reconstruction. Here, we report on synthesis, swelling, thermal, mechanical and biological properties of novel hydrogel tissue expanders based on poly(styrene-alt-maleic anhydride) copolymers covalently crosslinked with p-divinylbenzene. The hydrogels exerted hydrolysis-driven swelling response with induction period over the first two days with minimal volume change and gradual volume growth within 30 days in buffered saline solution. Their final swollen volume reached more than 14 times the dry volume with little dependence on the crosslinker content. The mechanical coherence of samples during swelling and in their fully swollen state was excellent, the compression modulus of elasticity being between 750 and 850 kPa. In vitro cell culture experiments and in vivo evaluation in mice models showed excellent biocompatibility and suitable swelling responses meeting thus the application requirements as soft tissue expanders.

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“…Amphiphilic block copolymers composed of epoxyphilic blocks and epoxy-phobic blocks, which are a new class of toughening modifiers, have attracted considerable attention in recent decades. [13][14][15][16][17][18][19] It is known that a small amount of block copolymer (≦5 wt%) incorporated into epoxy can improve the fracture toughness of epoxy thermosets significantly without sacrificing their glass transition temperature and elastic modulus too much. 20,21 The reason is that the nanostructure domains generated by the rearrangement of block copolymers are capable of repelling the crack propagations within epoxy thermosets.…”

Section: Introductionmentioning

confidence: 99%

Toughening of epoxy thermosets with nano‐sized or micron‐sized domains of poly(ethylene oxide)‐b‐poly(butadiene‐co‐acrylonitrile)‐b‐poly(ethylene oxide) triblock copolymers synthesized using room temperature ester coupling reaction

Jheng

Wang

Hsieh

et al. 2020

J of Applied Polymer Sci

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Poly(ethylene oxide)-b-poly(butadiene-co-acrylonitrile)-b-poly(ethylene oxide) (PEO-b-PBN-b-PEO) triblock copolymers with three different compositions were synthesized from poly(ethylene glycol) methyl ethers and carboxylic acid-terminated poly(butadiene-co-acrylonitrile) (CTBN) by ester coupling reaction at room temperature. The PEO-b-PBN-b-PEO was incorporated into anhydride cured epoxy thermosets to improve the fracture toughness by the formation of either nano-sized spherical micelles or micron-sized vesicles. The polymer chemical structure was confirmed by Fourier transform infrared spectroscopy, nuclear magnetic resonance, and gel permeation chromatography. The morphology of PEO-b-PBN-b-PEO within the epoxy thermosets was investigated using a transmission electron microscope, an atomic force microscope, and a scanning electron microscope. Also, we conducted impact testing and plane-strain fracture toughness testing to evaluate the fracture toughness in terms of the impact strength and the critical stress intensity factors (K IC) for the modified epoxy thermosets. The results revealed that all the PEO-b-PBN-b-PEO triblock copolymers are more effective in the toughening of epoxy thermoset compare to CTBN. We found that the 5 wt% PEO-b-PBN-b-PEO modified epoxy thermoset containing micron-sized vesicles exhibited the highest K IC , which was 3.23 times as high as the K IC of pristine epoxy thermoset. Besides, the glass transition temperature remained and the tensile modulus did not reduce remarkably when the amount of PEO-b-PBN-b-PEO added into epoxy was 5 wt%.

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Enhancing mechanical performance of epoxy thermosets via designing a block copolymer to self-organize into “core–shell” nanostructure

Abstract: A rigid-flexible amphiphilic pentablock copolymer, polystyrene-block-poly(ε-caprolactone)-block-polydimethylsiloxane-block-poly(ε-caprolactone)-block-polystyrene (PS-PCL-PDMS-PCL-PS, SLDLS), was designed.

Cited by 19 publications

References 25 publications

Enhanced toughness and thermal conductivity for epoxy resin with a core–shell structured polyacrylic modifier and modified boron nitride

Enhanced toughness and thermal conductivity for epoxy resin with a core–shell structured polyacrylic modifier and modified boron nitride

Hydrogel Tissue Expanders for Stomatology. Part II. Poly(styrene-maleic anhydride) Hydrogels

Toughening of epoxy thermosets with nano‐sized or micron‐sized domains of poly(ethylene oxide)‐b‐poly(butadiene‐co‐acrylonitrile)‐b‐poly(ethylene oxide) triblock copolymers synthesized using room temperature ester coupling reaction

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