Nanostructured Thermosetting Blends of Phenolic Thermosets and Poly(ethylene oxide)‐<i>block</i>‐poly(propylene oxide)‐<i>block</i>‐poly(ethylene oxide) Triblock Copolymer

Meng, Fanliang; Yi, Fangping; Zheng, Sixun

doi:10.1080/00222340801955032

Cited by 12 publications

(3 citation statements)

References 39 publications

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“…Nanostructured thermosets are effectively obtained through reaction-induced microphase separation of PPO blocks from the thermosetting matrix [20]. The morphologies of the modified thermosetting systems 5F consist of spherical micelles of PPO nanodomains dispersed in the thermoset-rich phase (Fig.…”

Section: Morphology and Dispersion Of Compositesmentioning

confidence: 99%

Effect of clay and PEO-PPO-PEO block copolymer on the microstructure and properties of cyanate ester/epoxy composite

Huo

et al. 2015

Composites Part A: Applied Science and Manufacturing

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Section: Morphology and Dispersion Of Compositesmentioning

confidence: 99%

Effect of clay and PEO-PPO-PEO block copolymer on the microstructure and properties of cyanate ester/epoxy composite

Huo

et al. 2015

Composites Part A: Applied Science and Manufacturing

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“…Variations in the chemical composition, , number of blocks, , and architecture , of the block polymer additives have been explored. Additionally, reactive block polymers have been investigated as a means of fixing the morphologies and expanding the choice of precursors used in the thermoset. − The scope of thermosets investigated in these studies remains fairly narrow as epoxy thermosets ,,− ,− have received the bulk of the attention with only limited studies of phenolic ,, and unsaturated polyester resins. , Finally, applications of nanostructured thermosets using block polymers has primarily focused on their potential to improve the mechanical properties of the thermoset, ,,, leaving a range of applications unexplored.…”

Section: Introductionmentioning

confidence: 99%

Formation of Nanostructured Poly(dicyclopentadiene) Thermosets Using Reactive Block Polymers

Amendt

Chen

2010

Macromolecules

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Nanostructured thermosets were prepared by reaction-induced phase separation (RIPS) using a metathesis-cross-linkable monomer in the presence of a metathesis-reactive block polymer. Mixtures of poly(norbornenylethylstyrene-s-styrene)-b-poly(lactide) (PNS-PLA) and dicyclopentadiene (DCPD) in tetrahydrofuran were cross-linked using the second generation Grubbs catalyst. Small-angle X-ray scattering analysis of a series of cured films containing PNS-PLA with varied PLA block lengths and 0-83 wt % DCPD indicated the presence of nanophase-separated disordered morphologies postcuring in most cases. Scanning electron microscopy of cured films after removal of the PLA phase revealed that a majority of the films exhibited a bicontinuous structure. Mechanistic investigations demonstrated that cross-linking the PNS block into the matrix was vital in preventing macrophase separation, and the morphologies observed were relatively unaffected by variations in the concentration of the catalyst. We propose a general mechanism for the formation of nanostructured DCPD using this protocol and develop critical conditions for the formation of bicontinuous structures based on the extent of overlap of the block polymer.

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“…Although some block copolymers containing crystalline subchains such as poly(ethylene oxide) and poly(ε-caprolactone) have been used to access the nanophases in thermosets, these crystallizable blocks are generally thermoset-philic. Upon incorporating these block copolymers into the thermosets such as epoxy, − ,,− ,,,− ,,, phenolic , or unsaturated resins, they are no longer crystallizable owing to their miscibility with these thermosets. It is of interest and importance to investigate the formation and crystallization behavior of crystalline nanophases in thermosets.…”

Section: Introductionmentioning

confidence: 99%

Formation and Confined Crystallization of Polyethylene Nanophases in Epoxy Thermosets

Zhang

Zheng

2013

Macromolecules

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In this contribution, we reported the investigation of the formation and confined crystallization behavior of polyethylene nanophases in epoxy thermosets. The nanostructured epoxy thermosets were prepared by the use of a poly(ε-caprolactone)-block-polyethylene-block-poly(ε-caprolactone) (PCL-b-PE-b-PCL) triblock copolymer. The crystalline midblock (viz. PE) of the triblock copolymer was prepared from an α,ω-diacetoxy-terminated polycyclooctadiene with the molecular weight as high as M n = 11,000, which was synthesized via the ring-opening metathesis polymerization (ROMP) of cyclooctadiene catalyzed by Grubbs second generation catalyst. The formation of PE nanophases in epoxy thermosets was evidenced with transmission electronic microscopy (TEM), small-angle X-ray scattering (SAXS) and dynamic mechanical thermal analysis (DMTA). It was found that in the nanostructured thermosets, the spherical nanophases of PE with the size of 20–30 nm in diameter were dispersed into the continuous epoxy matrices. Wide angle X-ray diffraction (XRD) showed that the formation of PE nanophases did not alter the structure of PE crystals. The investigations of isothermal and nonisothermal crystallization kinetics showed that the crystallization of PE in the nanostructured thermosets was in a confined manner and the confinement has been interpreted on the basis of nanoscaled space, interdomain connectivity, and the cross-linked structures of epoxy matrices.

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Nanostructured Thermosetting Blends of Phenolic Thermosets and Poly(ethylene oxide)‐block‐poly(propylene oxide)‐block‐poly(ethylene oxide) Triblock Copolymer

Cited by 12 publications

References 39 publications

Effect of clay and PEO-PPO-PEO block copolymer on the microstructure and properties of cyanate ester/epoxy composite

Effect of clay and PEO-PPO-PEO block copolymer on the microstructure and properties of cyanate ester/epoxy composite

Formation of Nanostructured Poly(dicyclopentadiene) Thermosets Using Reactive Block Polymers

Formation and Confined Crystallization of Polyethylene Nanophases in Epoxy Thermosets

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