Flexible Epoxy Resin Formed Upon Blending with a Triblock Copolymer through Reaction-Induced Microphase Separation

Chu, Wei-Cheng; Lin, Wei-Sheng; Kuo, Shiao‐Wei

doi:10.3390/ma9060449

Cited by 21 publications

(13 citation statements)

References 36 publications

(40 reference statements)

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“…BCPs have been the topic of discussion over the last three decades, frequently due to the fascinating behavior of these amphiphilic species . In polymeric systems, the blocks display different affinity towards a potential solvent and, frequently, a tendency to avoid mixing of dissimilar blocks with one another is perceived and it paves way towards the arranging of the blocks into well‐ordered structures with feature sizes determined by the lengths of the blocks—typically on the scale of nanometers .…”

Section: Bcps As Toughening Agents For Epoxy Resinsmentioning

confidence: 99%

Innovative materials of this era for toughening the epoxy matrix: A review

2018

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This review aims to bring to light the potential efficiency of various materials as toughening agents for epoxy thermosets. The area of epoxy toughening has fascinated material scientists since toughened epoxies are employed as the appropriate candidates in a wide arena of applications. Based on the structure–property relationships, the traditional chemistry approaches have been tried so far to toughen the epoxy matrix. With the advent of the era of nanotechnology, the field of epoxy toughening has also gained momentum through the utilization of various types of modified and unmodified nanofillers in the epoxy matrix. In fact many new materials have replaced the conventional agents in the field of epoxy toughening. We are giving a comprehensive review which hints the various mechanisms of toughening as well as the novel materials used in the present scenario as potential toughening agents in the epoxy matrix with special reference to rubber, block copolymers, and nanofillers. POLYM. COMPOS., 39:E1959–E1986, 2018. © 2018 Society of Plastics Engineers

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Section: Bcps As Toughening Agents For Epoxy Resinsmentioning

confidence: 99%

Innovative materials of this era for toughening the epoxy matrix: A review

2018

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“…Epoxy resins are commonly cured by active hydrogen-containing compounds such as phenol novolac, bisphenol A novolac, dicyandiamide, and diamine [4][5][6][7][8][9][10][11][12][13]. However, the reaction product from active hydrogen and epoxy lead to a secondary alcohol.…”

Section: Introductionmentioning

confidence: 99%

High-Tg, Low-Dielectric Epoxy Thermosets Derived from Methacrylate-Containing Polyimides

et al. 2017

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Three methacrylate-containing polyimides (Px-MMA; x = 1-3) were prepared from the esterification of hydroxyl-containing polyimides (Px-OH; x = 1-3) with methacrylic anhydride. Px-MMA exhibits active ester linkages (Ph-O-C(=O)-) that can react with epoxy in the presence of 4-dimethylaminopyridine (DMAP), so Px-MMA acted as a curing agent for a dicyclopentadiene-phenol epoxy (HP7200) to prepare epoxy thermosets (Px-MMA/HP7200; x = 1-3) thermosets. For property comparisons, P1-OH/HP7200 thermosets were also prepared. The reaction between active ester and epoxy results in an ester linkage, which is less polar than secondary alcohol resulting from the reaction between phenolic OH and epoxy, so P1-MMA/HP7200 are more hydrophobic and exhibit better dielectric properties than P1-OH/HP7200. The double bond of methacrylate can cure at higher temperatures, leading to epoxy thermosets with a high-T g and moderate-to-low dielectric properties.

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“…where υe is the cross-link density, E' is the tensile storage modulus (MPa), R is the gas constant (8.314 m 3 •Pa•K −1 •mol −1 ), T is temperature in K corresponding to the storage modulus value [20]. average molecular weight (Mn) = 6,665 g/mol and the weight molecular weight (Mw) = 51,260 g/mol with a 7.7 polydispersity index (PDI; Figure 5).…”

Section: υE = E'/3rtmentioning

confidence: 99%

“…Epoxy resins are thermosetting polymers that form 3D network structures after exothermic reactions with amine or acidic anhydride hardeners [1,2]. Epoxy resins are interesting materials due to their excellent mechanical and thermal properties as well as chemical resistance [3][4][5][6]. A main disadvantage of the resins is their brittleness, which allows crack propagation upon outside impact.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Characterization of a Polyurethane Phase Separated to Nano Size in an Epoxy Polymer

Kim

Lee

et al. 2019

Coatings

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Epoxy resins are widely applicable in the aircraft, automobile, coating, and adhesive industries because of their good chemical resistance and excellent mechanical and thermal properties. However, upon external impact, the crack propagation of epoxy polymers weakens the overall impact resistance of these materials. Therefore, many impact modifiers have been developed to reduce the brittleness of epoxy polymers. Polyurethanes, as impact modifiers, can improve the toughness of polymers. Although it is well known that polyurethanes (PUs) are phase-separated in the polymer matrix after curing, connecting PUs to the polymer matrix for enhancing the mechanical properties of polymers has proven to be challenging. In this study, we introduced epoxy functional groups into polyol backbones, which is different from other studies that focused on modifying capping agents to achieve a network structure between the polymer matrix and PU. We confirmed the molecular weight of the prepared PU via gel permeation chromatography. Moreover, the prepared material was added to the epoxies and the resulting mechanical and thermal properties of the materials were evaluated. Furthermore, we conducted tensile, flexural strength, and impact resistance measurements. The addition of PU to the epoxy compositions enhanced their impact strength and maintained their mechanical strength up to 10 phr of PU. Furthermore, the morphologies observed with field emission scanning electron microscopy and transmission electron microscopy proved that the PU was phase separated in the epoxy matrix.

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Flexible Epoxy Resin Formed Upon Blending with a Triblock Copolymer through Reaction-Induced Microphase Separation

Cited by 21 publications

References 36 publications

Innovative materials of this era for toughening the epoxy matrix: A review

Innovative materials of this era for toughening the epoxy matrix: A review

High-Tg, Low-Dielectric Epoxy Thermosets Derived from Methacrylate-Containing Polyimides

Synthesis and Characterization of a Polyurethane Phase Separated to Nano Size in an Epoxy Polymer

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