Self-organized thermosets involving epoxy and poly(ɛ-caprolactone)-block-poly(ethylene-co-ethylethylene)-block-poly(ɛ-caprolactone) amphiphilic triblock copolymer

Hu, Di; Zhang, Chongyin; Yu, Ruan; Wang, Lei; Zheng, Sixun

doi:10.1016/j.polymer.2010.10.016

Cited by 33 publications

(19 citation statements)

References 45 publications

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“… Literature values of rubbery modulus data collected using SC . An assumed misplaced decimal point results in shifting the circled points the data to the left.…”

Section: Discussionmentioning

confidence: 99%

“…The DMA instrument manufacturers do suggest sample dimension ranges for given geometries , but do not discuss how a three order of magnitude modulus change through the glass transition can affect DMA measurements. Numerous researchers favor the 3pt bend geometry , other favor the DC geometry , and others favor the SC geometry . However, Duncan and others claim that the 3pt bend geometry is best suited for high modulus materials, such as metals, ceramics, and highly filled thermosetting polymers that show little change in modulus throughout the test .…”

Section: Introductionmentioning

confidence: 99%

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DMA testing of epoxy resins: The importance of dimensions

McAninch

Palmese

Lenhart

et al. 2015

Polymer Engineering & Sci

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Dynamic mechanical analysis is commonly used to characterize thermoset polymers at temperatures ranging from well below to well above their glass transition temperatures. Many sample fixtures are available; however, the best clamp and best sample dimensions for a given material are not often readily apparent. Five different epoxy amine networks with glass transitions spanning over 1008C were characterized on three-point bending, dual cantilever, and single cantilever clamps with both constant thickness and constant span-to-thickness. Glassy modulus values were accurately measured on all clamps provided span-to-thickness ratios >10 were maintained. Thermal expansion and decreasing sample stiffness with increasing temperature greatly affect measurements in the rubbery region resulting in single cantilever clamps being best suited to measure rubbery data.

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“… Literature values of rubbery modulus data collected using SC . An assumed misplaced decimal point results in shifting the circled points the data to the left.…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

DMA testing of epoxy resins: The importance of dimensions

McAninch

Palmese

Lenhart

et al. 2015

Polymer Engineering & Sci

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“…In addition to this, the hydrogen-bonding interactions of the phenolic hydroxyl groups of the block copolymers with DGEBA are responsible for the miscibility of PH in the epoxy matrix that causes a decrease in T g . Hu et al (2010) investigated the self-assembly behavior of poly(ε-caprolactone)block-poly(ethylene-coethylethylene)-block-poly(ε-caprolactone) (PCL-b-PEEE-b-PCL) triblock copolymer in epoxy thermosets. Figure 19 shows the blends of epoxy with PCL-b-PEEE-b-PCL triblock copolymer.…”

Section: Nanostructured Epoxy Thermosets With Chemically Modified/ Rementioning

confidence: 99%

Thermal Properties of Epoxy/Block Copolymer Blends

Salim¹,

Parameswaranpillai²,

Fox³

et al. 2016

Handbook of Epoxy Blends

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“…[1][2][3][4][5] a School of Chemical Sciences, Mahatma Gandhi University, Priyadarshini Hills P.O., Recently, block copolymers have been used to toughen epoxy systems: nanostructured blends can be obtained in this case due to the self-assembling property of different blocks in the thermosetting matrix. [6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] This approach is known as toughening by nanostructures. It is demonstrated that the cure kinetic study in epoxy-block copolymer systems shows an autocatalytic behavior due to the presence of hydroxyl groups generated during the epoxy amine reactions that are able to further catalyze the curing reaction.…”

Section: Introductionmentioning

confidence: 99%

Volume shrinkage and rheological studies of epoxidised and unepoxidised poly(styrene-block-butadiene-block-styrene) triblock copolymer modified epoxy resin–diamino diphenyl methane nanostructured blend systems

George

Puglia

Parameswaranpillai

et al. 2015

Phys. Chem. Chem. Phys.

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Styrene-block-butadiene-block-styrene (SBS) copolymers epoxidised at different epoxidation degrees were used as modifiers for diglycidyl ether of the bisphenol A-diamino diphenyl methane (DGEBA-DDM) system. Epoxy systems containing modified epoxidised styrene-block-butadiene-block-styrene (eSBS) triblock copolymer with compositions ranging from 0 to 30 wt% were prepared and the curing reaction was monitored in situ using rheometry and pressure-volume-temperature (PVT) analysis. By controlling the mole percent of epoxidation, we could generate vesicles, worm-like micelles and core-shell nanodomains. At the highest mole percent of epoxidation, the fraction of the epoxy miscible component in the triblock copolymer (epoxidised polybutadiene (PB)) was maximum. This gave rise to core-shell nanodomains having a size of 10-15 nm, in which the incompatible polystyrene (PS) becomes the core, the unepoxidised PB becomes the shell and the epoxidised PB interpenetrates with the epoxy phase. On the other hand, the low level of epoxidation gave rise to bigger domains having a size of ∼1 μm and the intermediate epoxidation level resulted in a worm-like structure. This investigation specifically focused on the importance of cure rheology on nanostructure formation, using rheometry. The reaction induced phase separation of the PS phase in the epoxy matrix was carefully explored through rheological measurements. PVT measurements during curing were carried out to understand the volume shrinkage of the blend, confirming that shrinkage behaviour is related to the block copolymer phase separation process during curing. The volume shrinkage was found to be maximum in the case of blends with unmodified SBS, where a heterogeneous morphology was observed, while a decrease in the shrinkage was evidenced in the case of SBS epoxidation. It could be explained by two effects: (1) solubility of the epoxidised block copolymer in the DGEBA leads to the formation of nanoscopic domains upon reaction induced phase separation and (2) the plasticisation effect of the epoxidised block copolymer in the epoxy resin.

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Self-organized thermosets involving epoxy and poly(ɛ-caprolactone)-block-poly(ethylene-co-ethylethylene)-block-poly(ɛ-caprolactone) amphiphilic triblock copolymer

Cited by 33 publications

References 45 publications

DMA testing of epoxy resins: The importance of dimensions

DMA testing of epoxy resins: The importance of dimensions

Thermal Properties of Epoxy/Block Copolymer Blends

Volume shrinkage and rheological studies of epoxidised and unepoxidised poly(styrene-block-butadiene-block-styrene) triblock copolymer modified epoxy resin–diamino diphenyl methane nanostructured blend systems

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