Morphology and Mechanical Properties of Star Block Copolymer Modified Epoxy Resin Blends

Khatiwada, Shankar P.; Chandran, C. Sarath; Lach, Ralf; Liebscher, Marco; Saiter, Jean Marc; Thomas, Sabu; Heinrich, Gert; Adhikari, Rameshwar

doi:10.1016/j.matpr.2017.06.038

Cited by 8 publications

(6 citation statements)

References 41 publications

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“…Thus, the present study demonstrates the optimization of experimental conditions to meet the targeted degree of conversion and polarity. Hence, the epST shows the prospects of being used as reactive template for the fabrication of nanostructured thermosetting resins [ 34 ].…”

Section: Discussionmentioning

confidence: 99%

“…However, Pandit et al [ 33 ] studied the epoxidation of a SB star block copolymer by using four different methods and declared the use of m-CPBA method as the most suitable in terms of cost, for preparing materials with a qualitatively well-defined epoxidation degree. Further, the suitability of such epoxidized samples as templates for nanostructured epoxy resins has been recently demonstrated [ 34 ].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties

et al. 2020

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The chemical modification (namely the epoxidation) of a star shaped block copolymer (BCP) based on polystyrene (PS) and polybutadiene (PB) and its effect on structural and mechanical properties of the polymer were investigated. Epoxidation degrees of 37 mol%, 58 mol%, and 82 mol% were achieved by the reaction of the copolymer with meta-chloroperoxy benzoic acid (m-CPBA) under controlled conditions. The BCP structure was found to change from lamellae-like to mixed-type morphologies for intermediate epoxidation level while leading to quite ordered cylindrical structures for the higher level of chemical modification. As a consequence, the glass transition temperature (Tg) of the soft PB component of the BCP shifted towards significantly higher temperature. A clear increase in tensile modulus and tensile strength with a moderate decrease in elongation at break was observed. The epoxidized BCPs are suitable as reactive templates for the fabrication of nanostructured thermosetting resins.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties

et al. 2020

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“…The epoxidation of the styrene/butadiene-based triblock copolymer was accomplished by using m-chloroperoxybenzoic acid ( m -CPBA) [35]. In a typical procedure, 100 g of Kraton D1101 and 500 mL of dichloromethane were poured into a three-necked round bottom flask and stirred until the polymer was completely dissolved.…”

Section: Methodsmentioning

confidence: 99%

“…Numerous studies have been carried out to investigate the effects of block copolymer on the mechanical, thermal, and electrical properties of modified epoxy systems [18,19,24,32,33,34,35], but the details on the effects of the dose on the ultimate phase morphology and mechanical properties of the dual-cured epoxy thermosetting system modified by block copolymers were not reported. Hence, the aim of this research was to achieve the preparation of toughened dual-cured micro- and nanostructured transparent epoxy thermosets.…”

Section: Introductionmentioning

confidence: 99%

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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“…The epoxidation of the styrene/butadiene-based triblock copolymer was accomplished following the standard method by using m-CPBA [20][21]. In a typical experiment, 10 g of LN3 and 200 mL of dichloromethane were poured into a three-necked round bottomed flask and stirred gently by magnetic stirrer until the polymer dissolved.…”

Section: Epoxidation Of Block Copolymermentioning

confidence: 99%

Mechanical and thermal properties of triblock copolymer modified epoxy resins

Khatiwada¹,

Thomas²,

Saiter³

et al. 2018

BIBECHANA

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We investigate the ways of improving thermal and mechanical properties of diglycidyl ether of bisphenol-A (DGEBA) based thermoset resin using diaminodiphenylsulphone (DDS) as hardener and using epoxidized polystyrene/polybutadiene-based triblock copolymers as modifier. The epoxidation was performed. The targeted chemical modification using meta-chloroperoxybenzoic acid (m-CPBA) of the copolymer was performed whereby the epoxidation of the butadiene chains mainly took place at 1,4 linkages. The modification copolymer was found to contribute in enhancing the mechanical performance of the blends with epoxy resin. The results indicated the formation of nanostructured morphology in the blends attributable to their enhanced impact strength.BIBECHANA 16 (2019) 196-203

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Morphology and Mechanical Properties of Star Block Copolymer Modified Epoxy Resin Blends

Cited by 8 publications

References 41 publications

Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties

Influence of Controlled Epoxidation of an Asymmetric Styrene/Butadiene Star Block Copolymer on Structural and Mechanical Properties

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

Mechanical and thermal properties of triblock copolymer modified epoxy resins

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