Influence of electron beam irradiation on the morphology and mechanical properties of styrene/butadiene triblock copolymers

Khatiwada, Shankar P.; Gohs, Uwe; Janke, Andreas; Jehnichen, Dieter; Heinrich, Gert; Adhikari, Rameshwar

doi:10.1016/j.radphyschem.2018.07.012

Cited by 7 publications

(7 citation statements)

References 38 publications

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“…The dose is the controlling parameter for electron induced reactions as well as the size and distribution of the microdomains in the EP/eKraton blends (see Figure 6). Consequently, the crosslinking behavior of Kraton D1101 was studied at a temperature of 215 °C in a nitrogen atmosphere for different dose values (50, 100, 200 kGy) in Reference [36]. In Reference [36], the dominance of the crosslinking reaction over chain scission was confirmed.…”

Section: Resultsmentioning

confidence: 99%

“…Consequently, the crosslinking behavior of Kraton D1101 was studied at a temperature of 215 °C in a nitrogen atmosphere for different dose values (50, 100, 200 kGy) in Reference [36]. In Reference [36], the dominance of the crosslinking reaction over chain scission was confirmed. Based on those results, the dose values of 20 and 50 kGy were precisely selected.…”

Section: Resultsmentioning

confidence: 99%

“…The mixture was then kept in a vacuum oven to allow the solvent to evaporate. Afterwards, an EB treatment was performed at a temperature of 215 °C under a nitrogen atmosphere with doses of 20 kGy and 50 kGy using an ELV-2 electron accelerator from the Budker Institute of Nuclear Physics (Novosibirsk, Russia) using the procedure we previously reported [36] (the doses were designated as “-20” and “-50”, respectively). Then the mixture of EP/eKraton was placed on an electrically-heated plate in an irradiation vessel which was mounted on the conveyor system of the electron accelerator.…”

Section: Methodsmentioning

confidence: 99%

“…After that, the pure thermoset resin was prepared by the reaction of a stoichiometric amount of EP with DDM (i.e., epoxy resin/DDM in the ratio of 70/30 wt.%). The mixture was pre-cured at 150 °C for 2 h followed by post-curing at 180 °C for another 2 h. The curing of the epoxy system containing 10 wt.% eKraton with doses of 20 kGy and 50 kGy was carried out as described in Reference [36]. In the case of a typical EB and thermal cured system, first the EB-cured EP/eKraton blends were mixed in a stoichiometric amount of DDM and magnetically stirred over a hot plate at 100 °C until the complete dissolution of DDM leading to the formation of a homogenous mixture.…”

Section: Methodsmentioning

confidence: 99%

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A New Way of Toughening of Thermoset by Dual-Cured Thermoplastic/Thermosetting Blend

Khatiwada

Gohs

Lach³

et al. 2019

Materials

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The work aims at establishing the optimum conditions for dual thermal and electron beam curing of thermosetting systems modified by styrene/butadiene (SB)-based triblock copolymers in order to develop transparent and toughened materials. The work also investigates the effects of curing procedures on the ultimate phase morphology and mechanical properties of these thermoset–SB copolymer blends. It was found that at least 46 mol% of the epoxidation degree of the SB copolymer was needed to enable the miscibility of the modified block copolymer into the epoxy resin. Hence, an electron beam curing dose of ~50 kGy was needed to ensure the formation of micro- and nanostructured transparent blends. The micro- and nanophase-separated thermosets obtained were analyzed by optical as well as scanning and transmission electron microscopy. The mechanical properties of the blends were enhanced as shown by their impact strengths, indentation, hardness, and fracture toughness analyses, whereby the toughness values were found to mainly depend on the dose. Thus, we have developed a new route for designing dual-cured toughened micro- and nanostructured transparent epoxy thermosets with enhanced fracture toughness.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

See 2 more Smart Citations

A New Way of Toughening of Thermoset by Dual-Cured Thermoplastic/Thermosetting Blend

Khatiwada

Gohs

Lach³

et al. 2019

Materials

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“…Additionally, cryogenic cutting was performed to preserve the cellular morphologies of PUF 39 . The PUFs were exposed to liquid nitrogen for one hour to freeze the cells and were cut by a sharp razor blade to minimize damage to cell structures 40 …”

Section: Materials and Experimental Methodsmentioning

confidence: 99%

Eco‐friendly blowing agent, HCFO‐1233zd, for the synthesis of polyurethane foam as cryogenic insulation

Park

Kim

et al. 2021

J of Applied Polymer Sci

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Polyurethane foam is an insulating material, which is adopted in various industrial fields owing to its high compressive strength, low thermal conductivity, and excellent impact resistance. The most important additive in the synthesis process of the polyurethane foam is the blowing agent because it significantly affects the cell structure and density. HFC‐245fa, the most widely used blowing agent, is expected to be terminated under strict environmental regulations owing to its high global warming potential. This study synthesizes a new eco‐friendly polyurethane foam with HCFO‐1223zd in the density range of 90 to 190 kg/m3. After the synthesis process, the microstructural morphology of the HCFO‐1223zd blown polyurethane foam was observed using scanning electron microscopy. Additionally, the insulation performance was compared to conventional polyurethane foam. Furthermore, mechanical characteristics were investigated at 20 and −163°C temperatures. The results show that the HCFO‐1233zd blown polyurethane foam has superior mechanical and thermal properties compared to the conventional blowing agents.

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The transition mechanism of dynamic mechanical loss peaks and phase analysis in binary block copolymers of styrene/butadiene rubber

Wang,

Liao,

Wang

2024

J Polym Res

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Influence of electron beam irradiation on the morphology and mechanical properties of styrene/butadiene triblock copolymers

Cited by 7 publications

References 38 publications

A New Way of Toughening of Thermoset by Dual-Cured Thermoplastic/Thermosetting Blend

A New Way of Toughening of Thermoset by Dual-Cured Thermoplastic/Thermosetting Blend

Eco‐friendly blowing agent, HCFO‐1233zd, for the synthesis of polyurethane foam as cryogenic insulation

The transition mechanism of dynamic mechanical loss peaks and phase analysis in binary block copolymers of styrene/butadiene rubber

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